FINAL TEST AT LABORATORY
Study of the diffusion in gaseous state and molecular speeds

1. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all are moving in an arbitrary direction;
   2. all have same speed;
   3. all are moving in the same direction;
   4. are considered to be at the same temperature, but may have different speeds;
   
   
2. At the ends of the tube following equilibrium reactions occurs:
   1. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   2. H⁺ + HO^- \=\ H₂O
   3. HCl + H₂O \=\ Cl^- + H₃O⁺
   4. NH₃ + HCl \=\ NH₄Cl
   
   
3. The time to the formation of the ring in the experiment is dependent on:
   1. the average energy or average speed of each involved species;
   2. the concentrations of the solutions used;
   3. the length of the tube and the width of the tube;
   4. the propagation of the species as neutral molecules and not as ions;
   
   
4. The fog observed during the experiment is due to:
   1. our experiment designed to trap the product of the reaction;
   2. presence of the ammonia;
   3. presence of the chlorine;
   4. formation of ammonium chloride;
   
   
5. The position of the ring in the experiment is dependent on:
   1. the average energy or average speed of each involved species;
   2. the width of the tube and not of the length of the tube;
   3. the mode energy or mode speed of each involved species;
   4. the length of the tube and not of the width of the tube;
   
   

TEST DE FINAL DE LABORATOR
Studiul difuziei in stare gazoasa si a vitezelor moleculare

1. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate se īndreapta īntr-o directie arbitrara;
   2. toate au aceeasi viteza;
   3. toate se deplaseaza īn aceeasi directie;
   4. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   
   
2. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   2. H⁺ + HO^- \=\ H₂O
   3. HCl + H₂O \=\ Cl^- + H₃O⁺
   4. NH₃ + HCl \=\ NH₄Cl
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. energia medie sau viteza medie a fiecarei specii implicate;
   2. concentratiile solutiilor utilizate;
   3. lungimea tubului si latimea tubului;
   4. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   5. lungimea tubului si nu latimea tubului;
   
   
4. Ceata observata īn timpul experimentului se datoreaza:
   1. experimentului nostru proiectat pentru a captura produsul de reactie;
   2. prezentei amoniacului;
   3. prezentei clorului;
   4. formarea clorurii de amoniu;
   
   
5. Pozitia inelului īn experimentul este dependenta de:
   1. energia medie sau viteza medie a fiecarei specii implicate;
   2. latimea tubului si nu lungimea tubului;
   3. viteza la moda sau energia la moda a fiecarei specii implicate;
   4. lungimea tubului si nu latimea tubului;
   
   

FINAL TEST AT LABORATORY
Study of the diffusion in gaseous state and molecular speeds

1. The position of the ring in the experiment is dependent on:
   1. the propagation of the species as ions and not as neutral molecules;
   2. the speed of diffusion of each involved species;
   3. the virtual speeds and not the real speeds of each involved species;
   4. the average energy or average speed of each involved species;
   
   
2. At the ends of the tube following equilibrium reactions occurs:
   1. NH₄⁺ + Cl^- \=\ NH₄Cl
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. NH₃ + HCl \=\ NH₄Cl
   4. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   
   
3. The time to the formation of the ring in the experiment is dependent on:
   1. the mode energy or mode speed of each involved species;
   2. the real speeds and not the virtual speeds of each involved species;
   3. the length of the tube and the width of the tube;
   4. the length of the tube and not of the width of the tube;
   
   
4. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all have same speed;
   2. all have same energy;
   3. are considered to be at the same temperature, but may have different energies;
   4. all are moving in the same direction;
   
   
5. The chronometer is used in the experiment for:
   1. to keep us busy;
   2. extracting the information necessary to calculate the speeds ratio;
   3. synchronization of the diffusion times;
   4. extracting the information necessary to calculate the diffusion coefficients;
   
   

TEST DE FINAL DE LABORATOR
Studiul difuziei in stare gazoasa si a vitezelor moleculare

1. Pozitia inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca ionii si nu ca si molecule neutre;
   2. viteza de difuzie a fiecarei specii implicate;
   3. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   4. energia medie sau viteza medie a fiecarei specii implicate;
   5. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   
   
2. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₄⁺ + Cl^- \=\ NH₄Cl
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. NH₃ + HCl \=\ NH₄Cl
   4. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. viteza la moda sau energia la moda a fiecarei specii implicate;
   2. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   3. lungimea tubului si latimea tubului;
   4. lungimea tubului si nu latimea tubului;
   5. latimea tubului si nu lungimea tubului;
   
   
4. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate au aceeasi viteza;
   2. toate au aceeasi energie;
   3. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   4. toate se deplaseaza īn aceeasi directie;
   
   
5. Cronometrul este utilizat īn experimentul pentru:
   1. sa ne tina ocupati;
   2. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   3. sincronizarea timpilor de difuzie;
   4. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   
   

FINAL TEST AT LABORATORY
Study of the diffusion in gaseous state and molecular speeds

1. The fog observed during the experiment is due to:
   1. formation of ammonium chloride;
   2. unproper illumination in the laboratory and our breathing;
   3. presence of the ammonia;
   4. our experiment designed to trap the product of the reaction;
   
   
2. We may say the followings:
   1. diffusion process appears only in gaseous state;
   2. the kinetic energy of a molecule is affected by temperature and pressure;
   3. the molecules have energy only in gaseous state;
   4. diffusion process appears in all gaseous, liquid and solid states;
   
   
3. The time to the formation of the ring in the experiment is dependent on:
   1. the width of the tube and not of the length of the tube;
   2. the speed of diffusion of each involved species;
   3. the average energy or average speed of each involved species;
   4. the virtual speeds and not the real speeds of each involved species;
   
   
4. The chronometer is used in the experiment for:
   1. extracting the information necessary to calculate the diffusion coefficients;
   2. synchronization of the diffusion times;
   3. indication of the moment when we should pay attention to the experiment;
   4. measuring of the diffusion time;
   
   
5. At the ends of the tube following equilibrium reactions occurs:
   1. H₂O \=\ H⁺ + HO^-
   2. NH₃ + HCl \=\ NH₄Cl
   3. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   

TEST DE FINAL DE LABORATOR
Studiul difuziei in stare gazoasa si a vitezelor moleculare

1. Ceata observata īn timpul experimentului se datoreaza:
   1. formarea clorurii de amoniu;
   2. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   3. prezentei amoniacului;
   4. experimentului nostru proiectat pentru a captura produsul de reactie;
   5. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   
   
2. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. proces de difuzie apare numai īn stare gazoasa;
   2. energia cinetica a unei molecule este afectata de temperatura si presiune;
   3. moleculele au energie numai īn stare gazoasa;
   4. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. latimea tubului si nu lungimea tubului;
   2. viteza de difuzie a fiecarei specii implicate;
   3. energia medie sau viteza medie a fiecarei specii implicate;
   4. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   5. lungimea tubului si latimea tubului;
   
   
4. Cronometrul este utilizat īn experimentul pentru:
   1. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   2. sincronizarea timpilor de difuzie;
   3. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   4. masurarea timpului de difuzie;
   
   
5. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H₂O \=\ H⁺ + HO^-
   2. NH₃ + HCl \=\ NH₄Cl
   3. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   

FINAL TEST AT LABORATORY
Study of the diffusion in gaseous state and molecular speeds

1. At the ends of the tube following equilibrium reactions occurs:
   1. NH₃ + HCl \=\ NH₄Cl
   2. H⁺ + HO^- \=\ H₂O
   3. H₂O \=\ H⁺ + HO^-
   4. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   
   
2. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. are considered to be at the same temperature, but may have different energies;
   2. all are moving in an arbitrary direction;
   3. are considered to be at the same temperature, but may have different speeds;
   4. all have same speed;
   
   
3. The time to the formation of the ring in the experiment is dependent on:
   1. the virtual speeds and not the real speeds of each involved species;
   2. the real speeds and not the virtual speeds of each involved species;
   3. the propagation of the species as neutral molecules and not as ions;
   4. the concentrations of the solutions used;
   
   
4. The chronometer is used in the experiment for:
   1. measuring of the diffusion time;
   2. to keep us busy;
   3. indication of the moment when we should pay attention to the experiment;
   4. synchronization of the diffusion times;
   
   
5. We may say the followings:
   1. the kinetic energy of a molecule is affected by temperature, pressure and size of the molecule;
   2. the molecules have speeds in all gaseous, liquid and solid states;
   3. diffusion process appears only in gaseous and liquid states;
   4. the kinetic energy of a molecule is affected by temperature only;
   
   

TEST DE FINAL DE LABORATOR
Studiul difuziei in stare gazoasa si a vitezelor moleculare

1. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₃ + HCl \=\ NH₄Cl
   2. H⁺ + HO^- \=\ H₂O
   3. H₂O \=\ H⁺ + HO^-
   4. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   
   
2. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   2. toate se īndreapta īntr-o directie arbitrara;
   3. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   4. toate au aceeasi viteza;
   5. toate se deplaseaza īn aceeasi directie;
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   2. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   3. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   4. concentratiile solutiilor utilizate;
   5. viteza de difuzie a fiecarei specii implicate;
   
   
4. Cronometrul este utilizat īn experimentul pentru:
   1. masurarea timpului de difuzie;
   2. sa ne tina ocupati;
   3. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   4. sincronizarea timpilor de difuzie;
   5. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   
   
5. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. energia cinetica a unei molecule este afectata de temperatura, presiune si dimensiunea moleculei;
   2. moleculele au viteze īn toate starile gazoasa, lichida si solida;
   3. proces de difuzie apare numai īn stare gazoasa si lichida;
   4. energia cinetica a unei molecule este afectata de numai temperatura;
   
   

FINAL TEST AT LABORATORY
Study of the diffusion in gaseous state and molecular speeds

1. The position of the ring in the experiment is dependent on:
   1. the average energy or average speed of each involved species;
   2. the real speeds and not the virtual speeds of each involved species;
   3. the propagation of the species as neutral molecules and not as ions;
   4. the concentrations of the solutions used;
   
   
2. At the ends of the tube following equilibrium reactions occurs:
   1. H⁺ + HO^- \=\ H₂O
   2. NH₃ + HCl \=\ NH₄Cl
   3. HCl + H₂O \=\ Cl^- + H₃O⁺
   4. H₂O \=\ H⁺ + HO^-
   
   
3. The chronometer is used in the experiment for:
   1. indication of the moment when we should pay attention to the experiment;
   2. extracting the information necessary to calculate the diffusion coefficients;
   3. to keep us busy;
   4. measuring of the diffusion time;
   
   
4. The fog observed during the experiment is due to:
   1. formation of ammonium chloride;
   2. presence of the chlorine;
   3. unproper illumination in the laboratory and our breathing;
   4. our experiment designed to trap the product of the reaction;
   
   
5. We may say the followings:
   1. the molecules have speeds only in gaseous state;
   2. the kinetic energy of a molecule is affected by temperature and pressure;
   3. the molecules have energy only in gaseous state;
   4. the molecules have speeds in all gaseous, liquid and solid states;
   
   

TEST DE FINAL DE LABORATOR
Studiul difuziei in stare gazoasa si a vitezelor moleculare

1. Pozitia inelului īn experimentul este dependenta de:
   1. energia medie sau viteza medie a fiecarei specii implicate;
   2. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   3. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   4. concentratiile solutiilor utilizate;
   
   
2. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H⁺ + HO^- \=\ H₂O
   2. NH₃ + HCl \=\ NH₄Cl
   3. HCl + H₂O \=\ Cl^- + H₃O⁺
   4. H₂O \=\ H⁺ + HO^-
   
   
3. Cronometrul este utilizat īn experimentul pentru:
   1. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   2. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   3. sa ne tina ocupati;
   4. masurarea timpului de difuzie;
   
   
4. Ceata observata īn timpul experimentului se datoreaza:
   1. formarea clorurii de amoniu;
   2. prezentei clorului;
   3. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   4. experimentului nostru proiectat pentru a captura produsul de reactie;
   
   
5. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. moleculele au viteze numai īn stare gazoasa;
   2. energia cinetica a unei molecule este afectata de temperatura si presiune;
   3. moleculele au energie numai īn stare gazoasa;
   4. moleculele au viteze īn toate starile gazoasa, lichida si solida;
   5. energia cinetica a unei molecule este afectata de temperatura, presiune si dimensiunea moleculei;
   
   

FINAL TEST AT LABORATORY
Obtaining of the oxygen: study of the gases laws

1. The values taken from the experiment conducted in the laboratory indicated that:
   1. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   2. the ideal model of a gas approximated the best the behavior of the released gas;
   3. the ideal model of a gas approximated the worst the behavior of the released gas;
   4. we possess enough information to decide what gas was released from the reaction;
   
   
2. In the laboratory were studied:
   1. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   2. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   3. increasing of the temperature of a solid mass when was heated;
   4. the lost of the mass of a solid as result of producing of some gas;
   
   
3. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KClO₃ -> KCl + O₂;
   2. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   3. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   4. distillation of the liquid air;
   
   
4. For gaseous state:
   1. we need to take supplementary precautions in the laboratory;
   2. the pressure is unchanged when a chemical reaction occurs;
   3. the pressure depends on the model which are used to approximate it;
   4. the pressure is subject to change when a chemical reaction occurs;
   
   
5. A state equation for a real gas is:
   1. a relation between an certain number of state parameters;
   2. a relation which takes into account certain deviations from the ideal model;
   3. a relation obtained after conducting of the experiment;
   4. a relation between an unlimited number of state parameters;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   2. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   3. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   4. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   5. oxigenul au fost eliberat ca urmare a descompunerii;
   
   
2. Īn laborator s-au studiat:
   1. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   2. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   3. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   4. pierdut din masa de solid ca urmare a producerii unor gaze;
   
   
3. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KClO₃ -> KCl + O₂;
   2. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   3. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   4. distilarea aerului lichid;
   5. KCl + O₂ -> KClO₃;
   
   
4. Pentru stare gazoasa:
   1. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   2. presiunea este neschimbata cānd apare o reactie chimica;
   3. presiunea depinde de modelul care este utilizat pentru o aproxima;
   4. presiunea se pot modifica atunci cānd apare o reactie chimica;
   5. presiunea este exact la fel ca si īn stare lichida;
   
   
5. O ecuatie de stare pentru un gaz real este:
   1. o relatie īntre un anumit numar de parametri de stare;
   2. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   3. o relatie obtinut dupa efectuarea experimentului;
   4. o relatie īntre un numar nelimitat de parametri de stare;
   5. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   
   

FINAL TEST AT LABORATORY
Obtaining of the oxygen: study of the gases laws

1. In the laboratory were studied:
   1. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   2. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   3. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   4. the producing of some gas as result of a lost of the mass of a solid;
   
   
2. A state equation for a real gas is:
   1. a relation derived to approximate the relation between state parameters;
   2. a relation between an unlimited number of state parameters;
   3. a relation between an certain number of state parameters;
   4. a relation which takes into account certain deviations from the ideal model;
   
   
3. The values taken from the experiment conducted in the laboratory indicated that:
   1. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   2. the ideal model of a gas approximated the best the behavior of the released gas;
   3. we do not possess enough information to decide what gas was released from the reaction;
   4. air were released as result of the decomposition;
   
   
4. For gaseous state:
   1. the pressure is approximately the same as in liquid state;
   2. we need to take supplementary precautions in the laboratory;
   3. the pressure is subject to change when a chemical reaction occurs;
   4. the pressure is much lower than in liquid state;
   
   
5. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KClO₃ -> KCl + O₂;
   2. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   3. opening a bubble water bottle;
   4. KCl + O₂ -> KClO₃;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Īn laborator s-au studiat:
   1. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   2. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   3. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   4. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   5. cresterea presiunii unui gaz cānd s-a īncalzit;
   
   
2. O ecuatie de stare pentru un gaz real este:
   1. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   2. o relatie īntre un numar nelimitat de parametri de stare;
   3. o relatie īntre un anumit numar de parametri de stare;
   4. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   
   
3. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   2. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   3. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   4. aer a fost eliberat ca urmare a descompunerii;
   5. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   
4. Pentru stare gazoasa:
   1. presiunea este aproximativ aceeasi ca si īn stare lichida;
   2. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   3. presiunea se pot modifica atunci cānd apare o reactie chimica;
   4. presiunea este mult mai mica decāt īn stare lichida;
   5. presiunea este neschimbata cānd apare o reactie chimica;
   
   
5. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KClO₃ -> KCl + O₂;
   2. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   3. deschiderea unei sticle de apa cu bule;
   4. KCl + O₂ -> KClO₃;
   5. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   
   

FINAL TEST AT LABORATORY
Obtaining of the oxygen: study of the gases laws

1. A state equation for a real gas is:
   1. a relation between an unlimited number of state parameters;
   2. a relation which may involve some constants dependent of gas composition;
   3. a relation which takes into account certain deviations from the ideal model;
   4. a relation between an certain number of state parameters;
   
   
2. The values taken from the experiment conducted in the laboratory indicated that:
   1. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   2. air were released as result of the decomposition;
   3. the ideal model of a gas approximated the worst the behavior of the released gas;
   4. we possess enough information to decide what gas was released from the reaction;
   
   
3. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. opening a bubble water bottle;
   2. KCl + O₂ -> KClO₃;
   3. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   4. distillation of the liquid air;
   
   
4. In the laboratory were studied:
   1. the lost of the mass of a solid as result of producing of some gas;
   2. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   3. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   4. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   
   
5. For gaseous state:
   1. the pressure is unchanged when a chemical reaction occurs;
   2. the pressure depends on the model which are used to approximate it;
   3. the pressure is much higher than in liquid state;
   4. the pressure is approximately the same as in liquid state;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. O ecuatie de stare pentru un gaz real este:
   1. o relatie īntre un numar nelimitat de parametri de stare;
   2. o relatie care poate implica unele constante dependente de compozitia gazului;
   3. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   4. o relatie īntre un anumit numar de parametri de stare;
   5. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   
   
2. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   2. aer a fost eliberat ca urmare a descompunerii;
   3. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   4. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   
3. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. deschiderea unei sticle de apa cu bule;
   2. KCl + O₂ -> KClO₃;
   3. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   4. distilarea aerului lichid;
   
   
4. Īn laborator s-au studiat:
   1. pierdut din masa de solid ca urmare a producerii unor gaze;
   2. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   3. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   4. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   
   
5. Pentru stare gazoasa:
   1. presiunea este neschimbata cānd apare o reactie chimica;
   2. presiunea depinde de modelul care este utilizat pentru o aproxima;
   3. presiunea este mult mai mare decāt īn stare lichida;
   4. presiunea este aproximativ aceeasi ca si īn stare lichida;
   
   

FINAL TEST AT LABORATORY
Obtaining of the oxygen: study of the gases laws

1. In the laboratory were studied:
   1. the lost of the mass of a solid as result of producing of some gas;
   2. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   3. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   4. increasing of the pressure of a gas when was heated;
   
   
2. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KNO₃ -> KNO₂ + O₂;
   2. KCl + O₂ -> KClO₃;
   3. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   4. H₂O₂ -> H₂O + O₂;
   
   
3. For gaseous state:
   1. the pressure is much higher than in liquid state;
   2. the pressure is subject to change when a chemical reaction occurs;
   3. we need to take supplementary precautions in the laboratory;
   4. the pressure is much lower than in liquid state;
   
   
4. A state equation for a real gas is:
   1. a relation obtained after conducting of the experiment;
   2. a relation which may involve some constants dependent of gas composition;
   3. a relation which is always true, independent of the values of the state parameters;
   4. a relation derived to approximate the relation between state parameters;
   
   
5. The values taken from the experiment conducted in the laboratory indicated that:
   1. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   2. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   3. we do not possess enough information to decide what gas was released from the reaction;
   4. we possess enough information to decide what gas was released from the reaction;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Īn laborator s-au studiat:
   1. pierdut din masa de solid ca urmare a producerii unor gaze;
   2. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   3. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   4. cresterea presiunii unui gaz cānd s-a īncalzit;
   5. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   
   
2. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KNO₃ -> KNO₂ + O₂;
   2. KCl + O₂ -> KClO₃;
   3. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   4. H₂O₂ -> H₂O + O₂;
   
   
3. Pentru stare gazoasa:
   1. presiunea este mult mai mare decāt īn stare lichida;
   2. presiunea se pot modifica atunci cānd apare o reactie chimica;
   3. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   4. presiunea este mult mai mica decāt īn stare lichida;
   
   
4. O ecuatie de stare pentru un gaz real este:
   1. o relatie obtinut dupa efectuarea experimentului;
   2. o relatie care poate implica unele constante dependente de compozitia gazului;
   3. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   4. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   
   
5. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   2. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   3. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   4. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   5. oxigenul au fost eliberat ca urmare a descompunerii;
   
   

FINAL TEST AT LABORATORY
Obtaining of the oxygen: study of the gases laws

1. The values taken from the experiment conducted in the laboratory indicated that:
   1. the ideal model of a gas approximated the best the behavior of the released gas;
   2. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   3. we possess enough information to decide what gas was released from the reaction;
   4. ozone were released as result of the decomposition;
   
   
2. In the laboratory were studied:
   1. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   2. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   3. the producing of some gas as result of a lost of the mass of a solid;
   4. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   
   
3. For gaseous state:
   1. the pressure is approximately the same as in liquid state;
   2. we need to take supplementary precautions in the laboratory;
   3. it exists an equation for all, p · V = n · R · T;
   4. the pressure is much higher than in liquid state;
   
   
4. A state equation for a real gas is:
   1. a relation derived to approximate the relation between state parameters;
   2. a relation which may involve some constants dependent of gas composition;
   3. usable in the laboratory, but is not to be used somewhere else;
   4. a relation which takes into account certain deviations from the ideal model;
   
   
5. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. Ag₂O -> Ag + O₂;
   2. Ag + O₂ -> Ag₂O;
   3. H₂O₂ -> H₂O + O₂;
   4. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   2. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   3. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   4. ozonul au fost eliberat ca urmare a descompunerii;
   5. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   
   
2. Īn laborator s-au studiat:
   1. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   2. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   3. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   4. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   
   
3. Pentru stare gazoasa:
   1. presiunea este aproximativ aceeasi ca si īn stare lichida;
   2. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   3. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   4. presiunea este mult mai mare decāt īn stare lichida;
   
   
4. O ecuatie de stare pentru un gaz real este:
   1. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   2. o relatie care poate implica unele constante dependente de compozitia gazului;
   3. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   4. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   5. o relatie obtinut dupa efectuarea experimentului;
   
   
5. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. Ag₂O -> Ag + O₂;
   2. Ag + O₂ -> Ag₂O;
   3. H₂O₂ -> H₂O + O₂;
   4. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   5. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. This method of analysis of metals and alloys is:
   1. a gravimetric method of analysis;
   2. useful for pure metals, not so useful for alloys;
   3. a destructive method of analysis;
   4. useful for alloys, not so useful for metals;
   
   
2. Why moisten the paper with solution of sodium nitrate?
   1. for stopping after a while the chemical reaction that takes place;
   2. to provide cations for analysis;
   3. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   4. to have something to do in the laboratory;
   
   
3. When the electrical circuit is closed:
   1. electric current passes the sample and the paper;
   2. surface of the sample is fastly covered by a protecting shield of electrons;
   3. elements from the metals are passed into solution as cations;
   4. elements from the solution are passed into sample as metals;
   
   
4. The electric charges after passing the metals into solution may be:
   1. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
5. The paper requires before analysis of the sample:
   1. to be weighted;
   2. to be burned;
   3. to be tested;
   4. to be acidified;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Aceasta metoda de analiza de metale si aliaje este:
   1. o metoda gravimetrica de analiza;
   2. utila pentru metale pure, nu atāt de utila pentru aliaje;
   3. o metoda distructiva de analiza;
   4. utila pentru aliaje, nu atāt de utila pentru metale;
   5. o metoda nedistructiva de analiza;
   
   
2. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru oprirea dupa un timp reactiei chimice care are loc;
   2. pentru furniza cationi pentru analiza;
   3. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   4. pentru a avea ceva de a face īn laborator;
   
   
3. Cānd circuitul electric este īnchis:
   1. curent electric trece prin proba si hārtie;
   2. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   3. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   4. elemente din solutie sunt trecute īn proba ca metale;
   5. anionii din solutie sunt trecuti īn proba ca metale;
   
   
4. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   5. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   
5. Hartia necesita ca īnainte de analiza probei:
   1. sa fie cantarita;
   2. sa fie arsa;
   3. sa fie testata;
   4. sa fie acidulata;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. Why moisten the paper with solution of sodium nitrate?
   1. for stopping after a while the chemical reaction that takes place;
   2. for the paper to work as isolator;
   3. to have something to do in the laboratory;
   4. to be cut easily with scissors;
   
   
2. When the electrical circuit is closed:
   1. water dissociation is inhibited;
   2. cations from the solution are passed into sample as metals;
   3. anions from the solution are passed into sample as metals;
   4. elements from the solution are passed into sample as metals;
   
   
3. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   
4. The paper requires before analysis of the sample:
   1. to be dry;
   2. to measure its surface;
   3. to be moistened with an electrolyte;
   4. to be tested;
   
   
5. When lead is identified:
   1. interference of other ions may affect the outcome;
   2. a violet complex appears;
   3. a red-brown complex appears;
   4. the reactions used clearly indicates its presence;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru oprirea dupa un timp reactiei chimice care are loc;
   2. pentru ca hartia sa actioneze ca izolator;
   3. pentru a avea ceva de a face īn laborator;
   4. sa fie taiat cu usurinta cu foarfeca;
   
   
2. Cānd circuitul electric este īnchis:
   1. disocierea apei este inhibata;
   2. cationii din solutie sunt trecuti īn proba ca metale;
   3. anionii din solutie sunt trecuti īn proba ca metale;
   4. elemente din solutie sunt trecute īn proba ca metale;
   
   
3. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   5. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   
   
4. Hartia necesita ca īnainte de analiza probei:
   1. sa fie uscata;
   2. sa i se masoare suprafata;
   3. sa fie umezita cu un electrolit;
   4. sa fie testata;
   
   
5. Cānd plumbul este identificat:
   1. interferenta altor ioni poate afecta rezultatul;
   2. apare un complex violet;
   3. apare un complex rosu-brun;
   4. reactiile utilizate īn mod clar ii indica prezenta;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. The paper requires before analysis of the sample:
   1. to be moistened with an electrolyte;
   2. to be cut in small pieces;
   3. to be dry;
   4. to measure its surface;
   
   
2. Why moisten the paper with solution of sodium nitrate?
   1. to accomodate ourselves to use chemicals;
   2. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   3. to have something to do in the laboratory;
   4. for the paper to work as isolator;
   
   
3. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   2. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
4. When aluminum is identified:
   1. the presence of other ions may produce a false positive outcome;
   2. is identified as Al³⁺ cation;
   3. only one identification reaction is possible;
   4. the presence of other ions may produce a true positive outcome;
   
   
5. This method of analysis of metals and alloys is:
   1. useful for alloys, not so useful for metals;
   2. useful for pure metals, not so useful for alloys;
   3. useful for both metals and alloys;
   4. a quantitative method of analysis;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Hartia necesita ca īnainte de analiza probei:
   1. sa fie umezita cu un electrolit;
   2. sa fie taiata īn bucati mici;
   3. sa fie uscata;
   4. sa i se masoare suprafata;
   
   
2. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. sa ne acomodam in a utiliza substante chimice;
   2. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   3. pentru a avea ceva de a face īn laborator;
   4. pentru ca hartia sa actioneze ca izolator;
   5. pentru oprirea dupa un timp reactiei chimice care are loc;
   
   
3. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   2. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   5. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   
   
4. Cānd aluminiu este identificat:
   1. prezenta altor ioni poate produce un rezultat fals pozitiv;
   2. este identificat ca cationul Al³⁺;
   3. doar o reactie de identificare este posibila;
   4. prezenta altor ioni poate produce un rezultat adevarat pozitiv;
   
   
5. Aceasta metoda de analiza de metale si aliaje este:
   1. utila pentru aliaje, nu atāt de utila pentru metale;
   2. utila pentru metale pure, nu atāt de utila pentru aliaje;
   3. utila atāt pentru metale si aliaje;
   4. o metoda cantitativa de analiza;
   5. o metoda nedistructiva de analiza;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. Why moisten the paper with solution of sodium nitrate?
   1. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   2. for the paper to work as isolator;
   3. to provide cations for analysis;
   4. for stopping after a while the chemical reaction that takes place;
   
   
2. The paper requires before analysis of the sample:
   1. to be moistened with an electrolyte;
   2. to measure its surface;
   3. to be burned;
   4. to be acidified;
   
   
3. The electric charges after passing the metals into solution may be:
   1. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   
4. When lead is identified:
   1. precautions should be made for toxic wastes disposal;
   2. the reactions used clearly indicates its presence;
   3. a red-brown complex appears;
   4. a heat release is observed;
   
   
5. This method of analysis of metals and alloys is:
   1. useful for both metals and alloys;
   2. useful for pure metals, not so useful for alloys;
   3. a destructive method of analysis;
   4. a nondestructive method of analysis;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   2. pentru ca hartia sa actioneze ca izolator;
   3. pentru furniza cationi pentru analiza;
   4. pentru oprirea dupa un timp reactiei chimice care are loc;
   5. pentru a avea ceva de a face īn laborator;
   
   
2. Hartia necesita ca īnainte de analiza probei:
   1. sa fie umezita cu un electrolit;
   2. sa i se masoare suprafata;
   3. sa fie arsa;
   4. sa fie acidulata;
   5. sa fie cantarita;
   
   
3. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   
4. Cānd plumbul este identificat:
   1. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   2. reactiile utilizate īn mod clar ii indica prezenta;
   3. apare un complex rosu-brun;
   4. se observa o eliberare de caldura;
   5. sunt utilizate substante periculoase;
   
   
5. Aceasta metoda de analiza de metale si aliaje este:
   1. utila atāt pentru metale si aliaje;
   2. utila pentru metale pure, nu atāt de utila pentru aliaje;
   3. o metoda distructiva de analiza;
   4. o metoda nedistructiva de analiza;
   5. o metoda gravimetrica de analiza;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. The electric charges after passing the metals into solution may be:
   1. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   4. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
2. The paper requires before analysis of the sample:
   1. to be tested;
   2. to measure its surface;
   3. to be burned;
   4. to be moistened with an electrolyte;
   
   
3. When lead is identified:
   1. a heat release is observed;
   2. a yellow complex appears;
   3. the reactions used clearly indicates its presence;
   4. a red-brown complex appears;
   
   
4. This method of analysis of metals and alloys is:
   1. a quantitative method of analysis;
   2. a nondestructive method of analysis;
   3. too ancient to be used today in the laboratory;
   4. useful for pure metals, not so useful for alloys;
   
   
5. When the electrical circuit is closed:
   1. elements from the solution are passed into sample as metals;
   2. anions from the solution are passed into sample as metals;
   3. elements from the metals are passed into solution as anions;
   4. elements from the metals are passed into solution as cations;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   4. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   5. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   
   
2. Hartia necesita ca īnainte de analiza probei:
   1. sa fie testata;
   2. sa i se masoare suprafata;
   3. sa fie arsa;
   4. sa fie umezita cu un electrolit;
   
   
3. Cānd plumbul este identificat:
   1. se observa o eliberare de caldura;
   2. apare un complex galben;
   3. reactiile utilizate īn mod clar ii indica prezenta;
   4. apare un complex rosu-brun;
   5. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   
   
4. Aceasta metoda de analiza de metale si aliaje este:
   1. o metoda cantitativa de analiza;
   2. o metoda nedistructiva de analiza;
   3. prea veche pentru a fi utilizata īn prezent īn laborator;
   4. utila pentru metale pure, nu atāt de utila pentru aliaje;
   5. utila pentru aliaje, nu atāt de utila pentru metale;
   
   
5. Cānd circuitul electric este īnchis:
   1. elemente din solutie sunt trecute īn proba ca metale;
   2. anionii din solutie sunt trecuti īn proba ca metale;
   3. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   4. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   5. curent electric evita proba si hārtia;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the number of atoms for each element;
   2. all glassware should be clean before, after and during the experiment;
   3. the liquid in the burette should be at the same level before and after conducting the experiment;
   4. all glassware should be clean before and after conducting the experiment;
   
   
2. The equivalence point is:
   1. the point in which a reactive should be added in the reaction flask;
   2. the point in which a reactive is fully consumed in the reaction;
   3. indicated when a color change is observed into the solution;
   4. something rarely encountered in chemistry;
   
   
3. Reactions between acids and bases:
   1. have as effect the change of the color of a solution;
   2. are always fast, taking place almost instantaneously;
   3. are rarely useful, and even rarely used;
   4. always have as a consequence the formation of a quantity of water;
   
   
4. A redox process:
   1. occurs only when we mix wrong substances in the laboratory;
   2. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. involves changing of the aggregation states of some participants to the reaction;
   4. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   
5. The indicator should be added:
   1. to indicate our safety limits when we dealt with chemicals;
   2. in small quantities, to avoid the errors in observations and in calculations;
   3. only at the suggestion of the supervisor;
   4. only in special cases, when the burette is graded from its bottom to its top;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii numarul de atomi pentru fiecare element;
   2. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   3. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   4. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   5. principiul conservarii energiei;
   
   
2. Punctul de echivalenta este:
   1. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   2. punctul īn care un reactiv este consumat complet īn reactie;
   3. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   4. ceva rar īntālnit īn chimie;
   5. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   
   
3. Reactiile īntre acizi si baze:
   1. au ca efect schimbarea culorii unei solutii;
   2. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   3. sunt rareori utile, si chiar mai rar utilizate;
   4. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   
   
4. Un proces redox:
   1. apare numai atunci cānd se amesteca substante gresit īn laborator;
   2. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. implica schimbarea a starilor de agregare ale unor participanti la reactie;
   4. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   5. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   
   
5. Trebuie adaugat indicatorul:
   1. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   2. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   3. numai la sugestia supraveghetorului;
   4. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   5. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The indicator should be added:
   1. in small quantities, to avoid the errors in observations and in calculations;
   2. only in special cases, when the burette is graded from its bottom to its top;
   3. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   4. to indicate our safety limits when we dealt with chemicals;
   
   
2. Reactions between acids and bases:
   1. are rarely useful, and even rarely used;
   2. are always fast, taking place almost instantaneously;
   3. have as a consequence the dissolution of a salt;
   4. are all exothermic, being therefore dangerous outside of the laboratory;
   
   
3. The density of the solutions depends on:
   1. provider;
   2. temperature;
   3. time elapsed since were prepared;
   4. quantity;
   
   
4. Titration as a laboratory operation involves:
   1. a natrium hydroxide solution;
   2. a mass measurement;
   3. an mixing of two ore more solutions;
   4. a burette;
   
   
5. In the calculations:
   1. are necessary to discuss with our colleagues;
   2. are necessary to draw the tables in our notebooks after completing of the experiment;
   3. are necessary to take some information from reagent bottles;
   4. are necessary to establish the coefficients of the chemical reaction;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Trebuie adaugat indicatorul:
   1. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   2. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   3. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   4. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   
   
2. Reactiile īntre acizi si baze:
   1. sunt rareori utile, si chiar mai rar utilizate;
   2. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   3. au drept consecinta dizolvarea unei sari;
   4. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   5. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   
   
3. Densitatea solutiilor depinde de:
   1. furnizor;
   2. temperatura;
   3. timpul scurs de cand au fost pregatite;
   4. cantitate;
   5. presiune;
   
   
4. Titrarea ca o operatiune de laborator implica:
   1. o solutie de hidroxid de sodiu;
   2. masurarea masei;
   3. amestecul a doua sau mai multe solutii;
   4. o biureta;
   5. un standard sau reactiv de referinta;
   
   
5. In calcule:
   1. este necesar sa discutam cu colegii;
   2. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   3. este necesar a se lua unele informatii de pe sticlele de reactivi;
   4. este necesara stabilirea coeficientilor reactiei chimice;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. Titration as a laboratory operation involves:
   1. a pH-metter;
   2. a salt solution;
   3. a natrium hydroxide solution;
   4. a standard or referential reactive;
   
   
2. The indicator should be added:
   1. in large quantities, according to the principle 'only size matters';
   2. to provide a color change at equivalence point;
   3. only in special cases, when the burette is graded from its bottom to its top;
   4. to indicate our safety limits when we dealt with chemicals;
   
   
3. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the volume;
   2. all glassware should be clean before, after and during the experiment;
   3. all glassware should be clean before and after conducting the experiment;
   4. the principle of the conservation of the energy;
   
   
4. Reactions between acids and bases:
   1. always have as a consequence the formation of a quantity of water;
   2. are rarely useful, and even rarely used;
   3. have as effect the change of the color of a solution;
   4. are always fast, taking place almost instantaneously;
   
   
5. In the calculations:
   1. are necessary to use some formulas expressing in different ways the concentration;
   2. are necessary to establish the coefficients of the chemical reaction;
   3. are necessary to use our phones;
   4. are necessary to take some information from reagent bottles;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Titrarea ca o operatiune de laborator implica:
   1. un pH-metru;
   2. o solutie de sare;
   3. o solutie de hidroxid de sodiu;
   4. un standard sau reactiv de referinta;
   5. masurarea masei;
   
   
2. Trebuie adaugat indicatorul:
   1. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   2. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   3. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   4. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   5. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   
   
3. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii volumului;
   2. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   3. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   4. principiul conservarii energiei;
   
   
4. Reactiile īntre acizi si baze:
   1. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   2. sunt rareori utile, si chiar mai rar utilizate;
   3. au ca efect schimbarea culorii unei solutii;
   4. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   
   
5. In calcule:
   1. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   2. este necesara stabilirea coeficientilor reactiei chimice;
   3. este necesar sa utilizam telefoanele;
   4. este necesar a se lua unele informatii de pe sticlele de reactivi;
   5. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The following chemical reactions were used in the experiments:
   1. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   4. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   
2. The density of the solutions depends on:
   1. provider;
   2. pressure;
   3. quantity;
   4. concentration;
   
   
3. The indicator should be added:
   1. to indicate our safety limits when we dealt with chemicals;
   2. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   3. only at the suggestion of the supervisor;
   4. only in special cases, when the burette is graded from its bottom to its top;
   
   
4. In the calculations:
   1. are necessary to draw the tables in our notebooks after completing of the experiment;
   2. are necessary to use our phones;
   3. are necessary to take some information from reagent bottles;
   4. are necessary to establish the coefficients of the chemical reaction;
   
   
5. When a chemical reaction is balanced, following should be considered:
   1. all glassware should be clean before, after and during the experiment;
   2. the liquid in the burette should be at the same level before and after conducting the experiment;
   3. the principle of the conservation of the volume;
   4. the principle of the conservation of the energy;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   4. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   
2. Densitatea solutiilor depinde de:
   1. furnizor;
   2. presiune;
   3. cantitate;
   4. concentratie;
   
   
3. Trebuie adaugat indicatorul:
   1. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   2. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   3. numai la sugestia supraveghetorului;
   4. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   
   
4. In calcule:
   1. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   2. este necesar sa utilizam telefoanele;
   3. este necesar a se lua unele informatii de pe sticlele de reactivi;
   4. este necesara stabilirea coeficientilor reactiei chimice;
   
   
5. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   2. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   3. principiul conservarii volumului;
   4. principiul conservarii energiei;
   5. principiul conservarii numarul de atomi pentru fiecare element;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The following chemical reactions were used in the experiments:
   1. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   2. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
2. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the number of atoms for each element;
   2. all glassware should be clean before, after and during the experiment;
   3. the principle of the conservation of the volume;
   4. all glassware should be clean before and after conducting the experiment;
   
   
3. Titration as a laboratory operation involves:
   1. a pH-metter;
   2. a mass measurement;
   3. a burette;
   4. a standard or referential reactive;
   
   
4. A redox process:
   1. involves changing of the oxidation states of some participants to the reaction;
   2. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. involves a transfer of electrons from one atom or group of atoms to another;
   4. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
5. The density of the solutions depends on:
   1. concentration;
   2. temperature;
   3. quantity;
   4. pressure;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   2. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
2. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii numarul de atomi pentru fiecare element;
   2. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   3. principiul conservarii volumului;
   4. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   
   
3. Titrarea ca o operatiune de laborator implica:
   1. un pH-metru;
   2. masurarea masei;
   3. o biureta;
   4. un standard sau reactiv de referinta;
   5. masurarea volumului;
   
   
4. Un proces redox:
   1. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   2. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   4. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   5. este considerat a fi urmatorul: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   
5. Densitatea solutiilor depinde de:
   1. concentratie;
   2. temperatura;
   3. cantitate;
   4. presiune;
   5. furnizor;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. For a water sample following measures may be quantitatively expressed:
   1. total alkalinity;
   2. mineral acidity;
   3. hardness;
   4. total acidity;
   
   
2. In the laboratory the water were:
   1. alkalinized for drinking purposes;
   2. biologically purified using the resin column;
   3. acidified for drinking purposes;
   4. complexed by using EDTA titrimetric method;
   
   
3. EDTA is used:
   1. for indication of the equilibrium point in the reaction;
   2. for complexing of Ca²⁺ and Mg²⁺ ions;
   3. for recharging of the resin for water softening;
   4. for safety precautions purposes;
   
   
4. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   2. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   3. NaOH + HCOO⁺ -> HCOONa + HO⁺
   4. NaOH + HCOO^- -> HCOONa + HO^-
   
   
5. In the laboratory were analyzed:
   1. the alkalinity of the water;
   2. the temperature of the water;
   3. the hardness of the water;
   4. the solubility of the water;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. alcalinitate totala;
   2. aciditate minerala;
   3. duritate;
   4. aciditate totala;
   
   
2. In laborator apa au fost:
   1. alcalinizeaza pentru baut;
   2. purificata biologic utilizānd coloana de rasina;
   3. acidulata pentru baut;
   4. complexata prin metoda titrimetrica EDTA;
   5. calita folosind coloana de rasina;
   
   
3. EDTA este utilizat:
   1. pentru indicarea punctului de echilibru īn reactie;
   2. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   3. pentru reīncarcarea rasinii la dedurizarea apei;
   4. ca masura de siguranta;
   5. ca reactiv pentru determinarea duritatii apei;
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   2. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   3. NaOH + HCOO⁺ -> HCOONa + HO⁺
   4. NaOH + HCOO^- -> HCOONa + HO^-
   5. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   
   
5. Īn laborator au fost analizate:
   1. alcalinitatea apei;
   2. temperatura apei;
   3. duritatea apei;
   4. solubilitatea apei;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. EDTA is used:
   1. for complexing of Ca²⁺ and Mg²⁺ ions;
   2. for indication of the equilibrium point in the reaction;
   3. for recharging of the resin for water softening;
   4. for safety precautions purposes;
   
   
2. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + CO₃^2- -> HCO₃^- + Cl^-
   3. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   4. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   
   
3. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
4. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   2. NaOH + HCOO^- -> HCOONa + HO^-
   3. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   4. NaOH + HCOO⁺ -> HCOONa + HO⁺
   
   
5. In the laboratory the water were:
   1. softened using the resin column;
   2. acidified for drinking purposes;
   3. complexed by using EDTA titrimetric method;
   4. alkalinized for drinking purposes;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. EDTA este utilizat:
   1. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   2. pentru indicarea punctului de echilibru īn reactie;
   3. pentru reīncarcarea rasinii la dedurizarea apei;
   4. ca masura de siguranta;
   5. ca reactiv pentru determinarea duritatii apei;
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + CO₃^2- -> HCO₃^- + Cl^-
   3. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   4. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   2. NaOH + HCOO^- -> HCOONa + HO^-
   3. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   4. NaOH + HCOO⁺ -> HCOONa + HO⁺
   
   
5. In laborator apa au fost:
   1. dedurizata folosind coloana de rasina;
   2. acidulata pentru baut;
   3. complexata prin metoda titrimetrica EDTA;
   4. alcalinizeaza pentru baut;
   5. purificata biologic utilizānd coloana de rasina;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   2. HCl + HO⁺ -> H₂O + Cl⁺
   3. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
2. In the laboratory the water were:
   1. alkalinized for drinking purposes;
   2. biologically purified using the resin column;
   3. complexed by using EDTA titrimetric method;
   4. softened using the resin column;
   
   
3. We may say the followings:
   1. purification of the water may include biological processes;
   2. water is pure only when is taken from a good freshwater mountain stream;
   3. purification of the water may include labeling processes;
   4. water is a good polar solvent;
   
   
4. EDTA is used:
   1. as reagent for determining the hardness of the water;
   2. for complexing of Na¹⁺ and K¹⁺ ions;
   3. for recharging of the resin for water softening;
   4. for complexing of Ca²⁺ and Mg²⁺ ions;
   
   
5. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   2. HCl + HO⁺ -> H₂O + Cl⁺
   3. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
2. In laborator apa au fost:
   1. alcalinizeaza pentru baut;
   2. purificata biologic utilizānd coloana de rasina;
   3. complexata prin metoda titrimetrica EDTA;
   4. dedurizata folosind coloana de rasina;
   5. calita folosind coloana de rasina;
   
   
3. Putem spune urmatoarele:
   1. purificarea apei poate include procese biologice;
   2. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   3. purificarea apei poate include procesele de etichetare;
   4. apa este un solvent polar bun;
   5. purificarea apei poate include procese chimice;
   
   
4. EDTA este utilizat:
   1. ca reactiv pentru determinarea duritatii apei;
   2. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   3. pentru reīncarcarea rasinii la dedurizarea apei;
   4. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + HO^- -> H₂O+Cl^-
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   5. HCl + CO₃^2- -> HCO₃^- + Cl^-
   
   

FINAL TEST AT LABORATORY
Water analysis

1. For a water sample following measures may be quantitatively expressed:
   1. total alkalinity;
   2. permanent alkalinity;
   3. mineral acidity;
   4. total acidity;
   
   
2. We may say the followings:
   1. water is good for drinking, it is nothing to be analysed;
   2. natural water may contain organic matter and living organisms;
   3. purification of the water may include labeling processes;
   4. purification of the water may include chemical processes;
   
   
3. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   2. HCl + HO⁺ -> H₂O + Cl⁺
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   
   
4. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   2. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   3. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   4. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   
   
5. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   2. NaOH + Cl⁺ -> NaCl + HO⁺
   3. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   4. NaOH + Cl^- -> NaCl + HO^-
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. alcalinitate totala;
   2. alcalinitate permanenta;
   3. aciditate minerala;
   4. aciditate totala;
   
   
2. Putem spune urmatoarele:
   1. apa este buna pentru consum, nu este nimic de a fi analizat;
   2. apa naturala poate contine materie organica si organisme vii;
   3. purificarea apei poate include procesele de etichetare;
   4. purificarea apei poate include procese chimice;
   5. apa este un solvent polar bun;
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   2. HCl + HO⁺ -> H₂O + Cl⁺
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   5. HCl + CO₃^2- -> HCO₃^- + Cl^-
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   2. NaOH + CO₃^2- -> HCO₃^- + HO^-
   3. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   4. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   2. NaOH + Cl⁺ -> NaCl + HO⁺
   3. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   4. NaOH + Cl^- -> NaCl + HO^-
   
   

FINAL TEST AT LABORATORY
Water analysis

1. For a water sample following measures may be quantitatively expressed:
   1. total alkalinity;
   2. mineral acidity;
   3. purity;
   4. total acidity;
   
   
2. EDTA is used:
   1. for recharging of the resin for water softening;
   2. for complexing of Ca²⁺ and Mg²⁺ ions;
   3. for indication of the equilibrium point in the reaction;
   4. for complexing of Na¹⁺ and K¹⁺ ions;
   
   
3. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + HCOO^- -> HCOONa + HO^-
   2. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   3. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   4. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   
   
4. In the laboratory were analyzed:
   1. the concentration of the water;
   2. the hardness of the water;
   3. the alkalinity of the water;
   4. the temperature of the water;
   
   
5. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   3. HCl + HO^- -> H₂O + Cl^-
   4. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. alcalinitate totala;
   2. aciditate minerala;
   3. puritate;
   4. aciditate totala;
   
   
2. EDTA este utilizat:
   1. pentru reīncarcarea rasinii la dedurizarea apei;
   2. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   3. pentru indicarea punctului de echilibru īn reactie;
   4. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + HCOO^- -> HCOONa + HO^-
   2. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   3. NaOH + CO₃^2- -> HCO₃^- + HO^-
   4. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   5. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   
   
4. Īn laborator au fost analizate:
   1. concentratia apei;
   2. duritatea apei;
   3. alcalinitatea apei;
   4. temperatura apei;
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   3. HCl + HO^- -> H₂O + Cl^-
   4. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   

FINAL TEST AT LABORATORY
Volumetric and gravimetric methods in study of corrosion

1. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an anion;
   2. always the metal changes its oxidation state;
   3. a gas is released only the corrosion of zinc;
   4. a gas is released at both corrosion of zinc and aluminum;
   
   
2. The aluminum plate:
   1. was degreased in sodium hydroxide solution;
   2. the surface is measured before and after immersing it in NaOH;
   3. the mass is measured before and after immersing it in NaOH;
   4. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   
   
3. Which of the following reactions may be called as of corrosion:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. H⁺ + Ni -> H₂ + Ni²⁺
   3. Ni(CO)₄ -> Ni + CO
   4. H⁺ + Zn -> H₂ + Zn²⁺
   
   
4. Corrosion of metals:
   1. may provide useful raw materials for analysis;
   2. is helping in the process of cleaning the metals surfaces;
   3. is the protection in time to chemical agents;
   4. can be reduced by electroplating;
   
   
5. The zinc plate:
   1. was corroded in sulfuric solution;
   2. was degreased in sulfuric acid solution;
   3. was involved in the volumetric method of corrosion analysis
   4. the mass is measured before and after immersing it in H₂SO₄;
   
   

TEST DE FINAL DE LABORATOR
Metode volumetrice si gravimetrice in studiul coroziunii

1. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un anion;
   2. īntotdeauna metalul isi schimba starea de oxidare;
   3. un gaz este eliberat numai la corodarea zincului;
   4. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   
   
2. Pentru placa de aluminiu:
   1. a fost degresata īn solutie de hidroxid de sodiu;
   2. suprafata se masoara īnainte si dupa imersia īn NaOH;
   3. masa este masurata īnainte si dupa imersia īn NaOH;
   4. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   
   
3. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. H⁺ + Ni -> H₂ + Ni²⁺
   3. Ni(CO)₄ -> Ni + CO
   4. H⁺ + Zn -> H₂ + Zn²⁺
   
   
4. Coroziunea metalelor:
   1. poate furniza materii prime utile pentru analiza;
   2. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   3. este protectia de durata impotriva agentilor chimici;
   4. poate fi redusa prin galvanizare;
   
   
5. Pentru placa de zinc:
   1. a fost corodata īn solutie sulfuric;
   2. a fost degresata īn solutie de acid sulfuric;
   3. a fost implicata īn metoda volumetrica de analiza a coroziunii
   4. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   5. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   
   

FINAL TEST AT LABORATORY
Volumetric and gravimetric methods in study of corrosion

1. The zinc plate:
   1. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   2. the surface is measured before and after immersing it in H₂SO₄;
   3. was corroded in sulfuric solution;
   4. was involved in the volumetric method of corrosion analysis
   
   
2. Corrosion of metals:
   1. is a beneficial process that shows the stability of metals;
   2. is the destruction of metals under the action of external factors;
   3. can be reduced by electroplating;
   4. can be reduced by passivation;
   
   
3. The aluminum plate:
   1. the mass is measured before and after immersing it in NaOH;
   2. was degreased in sodium hydroxide solution;
   3. the volume is measured before and after immersing it in NaOH;
   4. was corroded in sodium hydroxide solution;
   
   
4. In studied corrosion processes:
   1. always the metal changes its oxidation state;
   2. a gas is released only the corrosion of zinc;
   3. when a gas is released its volume depends on the amount of metal corroded;
   4. a gas is released only the corrosion of aluminum;
   
   
5. Which of the following reactions may be called as of corrosion:
   1. ZnO + CO -> Zn + CO₂
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. Ni(CO)₄ -> Ni + CO
   4. H⁺ + Zn -> H₂ + Zn²⁺
   
   

TEST DE FINAL DE LABORATOR
Metode volumetrice si gravimetrice in studiul coroziunii

1. Pentru placa de zinc:
   1. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   2. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   3. a fost corodata īn solutie sulfuric;
   4. a fost implicata īn metoda volumetrica de analiza a coroziunii
   
   
2. Coroziunea metalelor:
   1. este un proces benefic care arata stabilitatea metalelor;
   2. este distrugerea metalelor sub actiunea factorilor externi;
   3. poate fi redusa prin galvanizare;
   4. poate fi redusa prin pasivare;
   5. are loc pur si simplu prin expunerea la umiditate īn aer;
   
   
3. Pentru placa de aluminiu:
   1. masa este masurata īnainte si dupa imersia īn NaOH;
   2. a fost degresata īn solutie de hidroxid de sodiu;
   3. volumul se masoara īnainte si dupa imersia īn NaOH;
   4. a fost corodata īn solutie de hidroxid de sodiu;
   5. a fost implicata īn metoda volumetrica de analiza a coroziunii
   
   
4. Īn procesele de coroziune studiate:
   1. īntotdeauna metalul isi schimba starea de oxidare;
   2. un gaz este eliberat numai la corodarea zincului;
   3. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   4. un gaz este eliberat numai la corodarea aluminiului;
   5. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   
   
5. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. ZnO + CO -> Zn + CO₂
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. Ni(CO)₄ -> Ni + CO
   4. H⁺ + Zn -> H₂ + Zn²⁺
   5. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   
   

FINAL TEST AT LABORATORY
Volumetric and gravimetric methods in study of corrosion

1. Corrosion of metals:
   1. can be reduced by passivation;
   2. may provide useful raw materials for analysis;
   3. takes place merely from exposure to moisture in air;
   4. is a beneficial process that shows the stability of metals;
   
   
2. Which of the following reactions may be called as of corrosion:
   1. H⁺ + Fe -> H₂ + Fe²⁺
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. H⁺ + Ni -> H₂ + Ni²⁺
   
   
3. The zinc plate:
   1. the volume is measured before and after immersing it in H₂SO₄;
   2. was degreased in sulfuric acid solution;
   3. the mass is measured before and after immersing it in H₂SO₄;
   4. was involved in the gravimetric method of corrosion analysis
   
   
4. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an cation;
   2. the metal it changes its oxidation state becoming an anion;
   3. always the metal changes its oxidation state;
   4. a gas is released only the corrosion of aluminum;
   
   
5. The aluminum plate:
   1. was involved in the gravimetric method of corrosion analysis
   2. was involved in the volumetric method of corrosion analysis
   3. the mass is measured before and after immersing it in NaOH;
   4. was corroded in sodium hydroxide solution;
   
   

TEST DE FINAL DE LABORATOR
Metode volumetrice si gravimetrice in studiul coroziunii

1. Coroziunea metalelor:
   1. poate fi redusa prin pasivare;
   2. poate furniza materii prime utile pentru analiza;
   3. are loc pur si simplu prin expunerea la umiditate īn aer;
   4. este un proces benefic care arata stabilitatea metalelor;
   
   
2. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H⁺ + Fe -> H₂ + Fe²⁺
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. H⁺ + Ni -> H₂ + Ni²⁺
   
   
3. Pentru placa de zinc:
   1. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   2. a fost degresata īn solutie de acid sulfuric;
   3. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   5. a fost corodata īn solutie sulfuric;
   
   
4. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un cation;
   2. metalul isi schimba starea de oxidare pentru a deveni un anion;
   3. īntotdeauna metalul isi schimba starea de oxidare;
   4. un gaz este eliberat numai la corodarea aluminiului;
   
   
5. Pentru placa de aluminiu:
   1. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   2. a fost implicata īn metoda volumetrica de analiza a coroziunii
   3. masa este masurata īnainte si dupa imersia īn NaOH;
   4. a fost corodata īn solutie de hidroxid de sodiu;
   
   

FINAL TEST AT LABORATORY
Volumetric and gravimetric methods in study of corrosion

1. Which of the following reactions may be called as of corrosion:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. H⁺ + Ni -> H₂ + Ni²⁺
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
2. Corrosion of metals:
   1. can be reduced by electroplating;
   2. is a beneficial process that shows the stability of metals;
   3. may provide useful raw materials for analysis;
   4. takes place merely from exposure to moisture in air;
   
   
3. In studied corrosion processes:
   1. when a gas is released its volume depends on the amount of metal corroded;
   2. the metal it changes its oxidation state becoming an anion;
   3. always the metal changes its oxidation state;
   4. a gas is released at both corrosion of zinc and aluminum;
   
   
4. The aluminum plate:
   1. was degreased in sodium hydroxide solution;
   2. was corroded in sodium hydroxide solution;
   3. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   4. the mass is measured before and after immersing it in NaOH;
   
   
5. The zinc plate:
   1. was degreased in sulfuric acid solution;
   2. the mass is measured before and after immersing it in H₂SO₄;
   3. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   4. the surface is measured before and after immersing it in H₂SO₄;
   
   

TEST DE FINAL DE LABORATOR
Metode volumetrice si gravimetrice in studiul coroziunii

1. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. H⁺ + Ni -> H₂ + Ni²⁺
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. Al₂O₃ + NaOH -> NaAlO₂
   5. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   
   
2. Coroziunea metalelor:
   1. poate fi redusa prin galvanizare;
   2. este un proces benefic care arata stabilitatea metalelor;
   3. poate furniza materii prime utile pentru analiza;
   4. are loc pur si simplu prin expunerea la umiditate īn aer;
   5. poate fi redusa prin pasivare;
   
   
3. Īn procesele de coroziune studiate:
   1. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   2. metalul isi schimba starea de oxidare pentru a deveni un anion;
   3. īntotdeauna metalul isi schimba starea de oxidare;
   4. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   5. un gaz este eliberat numai la corodarea zincului;
   
   
4. Pentru placa de aluminiu:
   1. a fost degresata īn solutie de hidroxid de sodiu;
   2. a fost corodata īn solutie de hidroxid de sodiu;
   3. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   4. masa este masurata īnainte si dupa imersia īn NaOH;
   5. volumul se masoara īnainte si dupa imersia īn NaOH;
   
   
5. Pentru placa de zinc:
   1. a fost degresata īn solutie de acid sulfuric;
   2. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   3. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   4. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   5. a fost corodata īn solutie sulfuric;
   
   

FINAL TEST AT LABORATORY
Volumetric and gravimetric methods in study of corrosion

1. Corrosion of metals:
   1. is the protection in time to chemical agents;
   2. takes place merely from exposure to moisture in air;
   3. can be reduced by passivation;
   4. can be reduced by electroplating;
   
   
2. The aluminum plate:
   1. was corroded in sodium hydroxide solution;
   2. was involved in the volumetric method of corrosion analysis
   3. the surface is measured before and after immersing it in NaOH;
   4. the volume is measured before and after immersing it in NaOH;
   
   
3. Which of the following reactions may be called as of corrosion:
   1. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   2. H⁺ + Ni -> H₂ + Ni²⁺
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. H⁺ + Zn -> H₂ + Zn²⁺
   
   
4. In studied corrosion processes:
   1. a gas is released at both corrosion of zinc and aluminum;
   2. the metal it changes its oxidation state becoming an anion;
   3. when a gas is released its volume depends on the amount of metal corroded;
   4. the metal it changes its oxidation state becoming an cation;
   
   
5. The zinc plate:
   1. was involved in the volumetric method of corrosion analysis
   2. the volume is measured before and after immersing it in H₂SO₄;
   3. was involved in the gravimetric method of corrosion analysis
   4. the mass is measured before and after immersing it in H₂SO₄;
   
   

TEST DE FINAL DE LABORATOR
Metode volumetrice si gravimetrice in studiul coroziunii

1. Coroziunea metalelor:
   1. este protectia de durata impotriva agentilor chimici;
   2. are loc pur si simplu prin expunerea la umiditate īn aer;
   3. poate fi redusa prin pasivare;
   4. poate fi redusa prin galvanizare;
   
   
2. Pentru placa de aluminiu:
   1. a fost corodata īn solutie de hidroxid de sodiu;
   2. a fost implicata īn metoda volumetrica de analiza a coroziunii
   3. suprafata se masoara īnainte si dupa imersia īn NaOH;
   4. volumul se masoara īnainte si dupa imersia īn NaOH;
   5. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   
   
3. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   2. H⁺ + Ni -> H₂ + Ni²⁺
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. H⁺ + Zn -> H₂ + Zn²⁺
   
   
4. Īn procesele de coroziune studiate:
   1. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   2. metalul isi schimba starea de oxidare pentru a deveni un anion;
   3. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   4. metalul isi schimba starea de oxidare pentru a deveni un cation;
   5. īntotdeauna metalul isi schimba starea de oxidare;
   
   
5. Pentru placa de zinc:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   3. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   4. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   5. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. Theoretical mass of nickel deposited is calculated using:
   1. perfect gas law;
   2. the conservation of the number of atoms for each element law;
   3. the electrolysis law;
   4. solutions laws;
   
   
2. At the nickel plating following reactions took place:
   1. at anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   2. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the cathode: O^2- - 2e^- -> O₂⁰
   3. at anode (+), connected with nickel piece, Ni²⁺ + 2e^- -> Ni⁰
   4. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the anode: O^2- - 2e^- -> O₂⁰
   
   
3. It is expected to have a mass of nickel deposited:
   1. much lower than the calculated theoretical one;
   2. inversely proportional with the surface of the sample;
   3. lower than the calculated theoretical one;
   4. inversely proportional with the nickel plating time;
   
   
4. Electrical conductivity of nickel salts solutions:
   1. is relatively small;
   2. depends on the intensity of the current used;
   3. depends on the potential of the source used;
   4. is relatively high;
   
   
5. The intensity of the current:
   1. is to be calculated before to start the experiment;
   2. does not affect the quality nor the quantity of the nickel deposition;
   3. should be adjusted by the technicians, we have nothing to do there;
   4. is to be calculated after conducting the experiment;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea gazelor perfecte;
   2. conservarea numarului de atomi pentru fiecare element;
   3. legea electrolizei;
   4. legea solutilor;
   
   
2. La nichelare urmatoarele reactii au avut loc:
   1. la anod (+), īn contact cu piesa de nichel, Ni⁰ - 2e^- -> Ni²⁺
   2. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la catod: O^2- - 2e^- -> O₂⁰
   3. la anod (+), īn legatura cu piesa de nichel, Ni²⁺ + 2e^- -> Ni⁰
   4. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la anod: O^2- - 2e^- -> O₂⁰
   5. la catod (-), īn contact cu piesa metalica, Ni²⁺ + 2e^- -> Ni⁰
   
   
3. Este de asteptat ca masa de nichel depus sa fie:
   1. mult mai mica decāt cea teoretica calculata;
   2. invers proportionala cu suprafata probei;
   3. mai mica decāt cea teoretica calculata;
   4. invers proportional cu timpul de nichelare;
   
   
4. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. este relativ mica;
   2. depinde de intensitatea curentului utilizat;
   3. depinde de potentialul sursei utilizate;
   4. este relativ mare;
   5. este īmbunatatita prin adaosuri de saruri;
   
   
5. Intensitatea curentului:
   1. trebuie sa fie calculata īnainte de a īncepe experimentul;
   2. nu afecteaza calitatea nici cantitatea nichelului depus;
   3. ar trebui sa fie ajustata de catre tehnicieni, nu avem nimic de a face acolo;
   4. se calculeaza dupa efectuarea experimentului;
   5. afecteaza numai calitatea depunerii nichelului;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. Electrical conductivity of nickel salts solutions:
   1. is improved by salts additions;
   2. is relatively high;
   3. depends on the intensity of the current used;
   4. depends on the potential of the source used;
   
   
2. The intensity of the current:
   1. is to be adjusted when the experiment starts;
   2. affect only the quality of the nickel deposition;
   3. does not affect the quality nor the quantity of the nickel deposition;
   4. affect only the quantity of the nickel deposition;
   
   
3. Theoretical mass of nickel deposited is calculated using:
   1. perfect gas law;
   2. the conservation of the energy law;
   3. the electrolysis law;
   4. the conservation of the number of atoms for each element law;
   
   
4. It is expected to have a mass of nickel deposited:
   1. proportional with the intensity of the current used;
   2. higher than the calculated theoretical one;
   3. much higher than the calculated theoretical one;
   4. inversely proportional with the nickel plating time;
   
   
5. At the nickel plating following reactions took place:
   1. at anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   2. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the anode: O^2- - 2e^- -> O₂⁰
   3. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the cathode: O^2- - 2e^- -> O₂⁰
   4. at cathode (-), connected with metallic piece, Ni²⁺ + 2e^- -> Ni⁰
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. este īmbunatatita prin adaosuri de saruri;
   2. este relativ mare;
   3. depinde de intensitatea curentului utilizat;
   4. depinde de potentialul sursei utilizate;
   
   
2. Intensitatea curentului:
   1. trebuie sa fie ajustata cand se incepe experimentul;
   2. afecteaza numai calitatea depunerii nichelului;
   3. nu afecteaza calitatea nici cantitatea nichelului depus;
   4. afecteaza numai cantitatea de nichel depus;
   
   
3. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea gazelor perfecte;
   2. legea conservarii energiei;
   3. legea electrolizei;
   4. conservarea numarului de atomi pentru fiecare element;
   5. legea solutilor;
   
   
4. Este de asteptat ca masa de nichel depus sa fie:
   1. proportionala cu intensitatea curentului utilizat;
   2. mai mare decāt cea teoretica calculata;
   3. mult mai mare decāt cea teoretica calculata;
   4. invers proportional cu timpul de nichelare;
   5. proportionala cu suprafata probei;
   
   
5. La nichelare urmatoarele reactii au avut loc:
   1. la anod (+), īn contact cu piesa de nichel, Ni⁰ - 2e^- -> Ni²⁺
   2. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la anod: O^2- - 2e^- -> O₂⁰
   3. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la catod: O^2- - 2e^- -> O₂⁰
   4. la catod (-), īn contact cu piesa metalica, Ni²⁺ + 2e^- -> Ni⁰
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. Electrical conductivity of nickel salts solutions:
   1. is reduced by salts additions;
   2. is relatively high;
   3. is improved by salts additions;
   4. depends on the intensity of the current used;
   
   
2. Theoretical mass of nickel deposited is calculated using:
   1. solutions laws;
   2. the conservation of the number of atoms for each element law;
   3. the electrolysis law;
   4. law of mass action;
   
   
3. At the nickel plating following reactions took place:
   1. at anode (+), connected with nickel piece, Ni²⁺ + 2e^- -> Ni⁰
   2. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the cathode: O^2- - 2e^- -> O₂⁰
   3. at cathode (-), connected with metallic piece, Ni²⁺ + 2e^- -> Ni⁰
   4. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the anode: O^2- - 2e^- -> O₂⁰
   
   
4. It is expected to have a mass of nickel deposited:
   1. higher than the calculated theoretical one;
   2. much higher than the calculated theoretical one;
   3. inversely proportional with the intensity of the current used;
   4. proportional with the surface of the sample;
   
   
5. The intensity of the current:
   1. it depends on the surface of the sample;
   2. is to be adjusted when the experiment starts;
   3. affect only the quantity of the nickel deposition;
   4. affect only the quality of the nickel deposition;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. este redusa prin adaosuri de saruri;
   2. este relativ mare;
   3. este īmbunatatita prin adaosuri de saruri;
   4. depinde de intensitatea curentului utilizat;
   5. este relativ mica;
   
   
2. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea solutilor;
   2. conservarea numarului de atomi pentru fiecare element;
   3. legea electrolizei;
   4. legea actiunii maselor;
   
   
3. La nichelare urmatoarele reactii au avut loc:
   1. la anod (+), īn legatura cu piesa de nichel, Ni²⁺ + 2e^- -> Ni⁰
   2. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la catod: O^2- - 2e^- -> O₂⁰
   3. la catod (-), īn contact cu piesa metalica, Ni²⁺ + 2e^- -> Ni⁰
   4. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la anod: O^2- - 2e^- -> O₂⁰
   
   
4. Este de asteptat ca masa de nichel depus sa fie:
   1. mai mare decāt cea teoretica calculata;
   2. mult mai mare decāt cea teoretica calculata;
   3. invers proportionala cu intensitatea curentului utilizat;
   4. proportionala cu suprafata probei;
   
   
5. Intensitatea curentului:
   1. depinde de suprafata probei;
   2. trebuie sa fie ajustata cand se incepe experimentul;
   3. afecteaza numai cantitatea de nichel depus;
   4. afecteaza numai calitatea depunerii nichelului;
   5. nu afecteaza calitatea nici cantitatea nichelului depus;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. It is expected to have a mass of nickel deposited:
   1. higher than the calculated theoretical one;
   2. proportional with the surface of the sample;
   3. proportional with the nickel plating time;
   4. inversely proportional with the intensity of the current used;
   
   
2. Theoretical mass of nickel deposited is calculated using:
   1. law of mass action;
   2. solutions laws;
   3. the electrolysis law;
   4. perfect gas law;
   
   
3. The intensity of the current:
   1. is to be calculated before to start the experiment;
   2. is to be adjusted when the experiment starts;
   3. affect only the quality of the nickel deposition;
   4. affect only the quantity of the nickel deposition;
   
   
4. Electrical conductivity of nickel salts solutions:
   1. depends on the intensity of the current used;
   2. is reduced by salts additions;
   3. is relatively small;
   4. is improved by salts additions;
   
   
5. At the nickel plating following reactions took place:
   1. at anode (+), connected with nickel piece, Ni²⁺ + 2e^- -> Ni⁰
   2. at cathode (-), connected with metallic piece, Ni²⁺ + 2e^- -> Ni⁰
   3. at anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   4. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the anode: O^2- - 2e^- -> O₂⁰
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. Este de asteptat ca masa de nichel depus sa fie:
   1. mai mare decāt cea teoretica calculata;
   2. proportionala cu suprafata probei;
   3. proportionala cu timpul de nichelare;
   4. invers proportionala cu intensitatea curentului utilizat;
   5. proportionala cu intensitatea curentului utilizat;
   
   
2. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea actiunii maselor;
   2. legea solutilor;
   3. legea electrolizei;
   4. legea gazelor perfecte;
   5. conservarea numarului de atomi pentru fiecare element;
   
   
3. Intensitatea curentului:
   1. trebuie sa fie calculata īnainte de a īncepe experimentul;
   2. trebuie sa fie ajustata cand se incepe experimentul;
   3. afecteaza numai calitatea depunerii nichelului;
   4. afecteaza numai cantitatea de nichel depus;
   5. ar trebui sa fie ajustata de catre tehnicieni, nu avem nimic de a face acolo;
   
   
4. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. depinde de intensitatea curentului utilizat;
   2. este redusa prin adaosuri de saruri;
   3. este relativ mica;
   4. este īmbunatatita prin adaosuri de saruri;
   
   
5. La nichelare urmatoarele reactii au avut loc:
   1. la anod (+), īn legatura cu piesa de nichel, Ni²⁺ + 2e^- -> Ni⁰
   2. la catod (-), īn contact cu piesa metalica, Ni²⁺ + 2e^- -> Ni⁰
   3. la anod (+), īn contact cu piesa de nichel, Ni⁰ - 2e^- -> Ni²⁺
   4. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la anod: O^2- - 2e^- -> O₂⁰
   5. la catod (-), īn legatura cu piesa metalica, Ni⁰ - 2e^- -> Ni²⁺
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. At the nickel plating following reactions took place:
   1. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the cathode: O^2- - 2e^- -> O₂⁰
   2. at anode (+), connected with nickel piece, Ni²⁺ + 2e^- -> Ni⁰
   3. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the anode: O^2- - 2e^- -> O₂⁰
   4. at cathode (-), connected with metallic piece, Ni⁰ - 2e^- -> Ni²⁺
   
   
2. The intensity of the current:
   1. affect only the quality of the nickel deposition;
   2. affect only the quantity of the nickel deposition;
   3. is to be adjusted when the experiment starts;
   4. is to be calculated after conducting the experiment;
   
   
3. It is expected to have a mass of nickel deposited:
   1. inversely proportional with the surface of the sample;
   2. higher than the calculated theoretical one;
   3. inversely proportional with the nickel plating time;
   4. proportional with the intensity of the current used;
   
   
4. Electrical conductivity of nickel salts solutions:
   1. depends on the intensity of the current used;
   2. is improved by salts additions;
   3. is relatively small;
   4. is relatively high;
   
   
5. Theoretical mass of nickel deposited is calculated using:
   1. the electrolysis law;
   2. solutions laws;
   3. law of mass action;
   4. the conservation of the number of atoms for each element law;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. La nichelare urmatoarele reactii au avut loc:
   1. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la catod: O^2- - 2e^- -> O₂⁰
   2. la anod (+), īn legatura cu piesa de nichel, Ni²⁺ + 2e^- -> Ni⁰
   3. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la anod: O^2- - 2e^- -> O₂⁰
   4. la catod (-), īn legatura cu piesa metalica, Ni⁰ - 2e^- -> Ni²⁺
   5. la anod (+), īn contact cu piesa de nichel, Ni⁰ - 2e^- -> Ni²⁺
   
   
2. Intensitatea curentului:
   1. afecteaza numai calitatea depunerii nichelului;
   2. afecteaza numai cantitatea de nichel depus;
   3. trebuie sa fie ajustata cand se incepe experimentul;
   4. se calculeaza dupa efectuarea experimentului;
   5. nu afecteaza calitatea nici cantitatea nichelului depus;
   
   
3. Este de asteptat ca masa de nichel depus sa fie:
   1. invers proportionala cu suprafata probei;
   2. mai mare decāt cea teoretica calculata;
   3. invers proportional cu timpul de nichelare;
   4. proportionala cu intensitatea curentului utilizat;
   
   
4. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. depinde de intensitatea curentului utilizat;
   2. este īmbunatatita prin adaosuri de saruri;
   3. este relativ mica;
   4. este relativ mare;
   5. depinde de potentialul sursei utilizate;
   
   
5. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea electrolizei;
   2. legea solutilor;
   3. legea actiunii maselor;
   4. conservarea numarului de atomi pentru fiecare element;
   5. legea gazelor perfecte;