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 real speeds and not the virtual speeds of each involved species;
   2. the speed of diffusion of each involved species;
   3. the propagation of the species as ions and not as neutral molecules;
   4. the concentrations of the solutions used;
   
   
2. 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 energy only in gaseous and liquid states;
   3. the molecules have speeds only in gaseous and liquid states;
   4. diffusion process appears in all gaseous, liquid and solid states;
   
   
3. 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 have same energy;
   4. are considered to be at the same temperature, but may have different speeds;
   
   
4. At the ends of the tube following equilibrium reactions occurs:
   1. H₂O \=\ H⁺ + HO^-
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. HCl + H₂O \=\ Cl^- + H₃O⁺
   4. H⁺ + HO^- \=\ H₂O
   
   
5. 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. measuring of the diffusion time;
   4. extracting the information necessary to calculate the speeds ratio;
   
   

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

1. Pozitia inelului īn experimentul este dependenta de:
   1. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   2. viteza de difuzie a fiecarei specii implicate;
   3. propagarea speciilor ca ionii si nu ca si molecule neutre;
   4. concentratiile solutiilor utilizate;
   
   
2. 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 energie numai īn stare gazoasa si lichida;
   3. moleculele au viteze numai īn stare gazoasa si lichida;
   4. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   
   
3. 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 au aceeasi energie;
   4. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   5. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   
   
4. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H₂O \=\ H⁺ + HO^-
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. HCl + H₂O \=\ Cl^- + H₃O⁺
   4. H⁺ + HO^- \=\ H₂O
   
   
5. 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. masurarea timpului de difuzie;
   4. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   5. sa ne tina ocupati;
   
   

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. presence of the chlorine;
   2. unproper illumination in the laboratory or our breathing;
   3. unproper illumination in the laboratory and our breathing;
   4. formation of ammonium chloride;
   
   
2. The time to the formation of the ring in the experiment is dependent on:
   1. the propagation of the species as neutral molecules and not as ions;
   2. the propagation of the species as ions and not as neutral molecules;
   3. the real speeds and not the virtual speeds of each involved species;
   4. the length of the tube and the width of the tube;
   
   
3. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all are moving in the same direction;
   2. all have same speed;
   3. all are moving in an arbitrary direction;
   4. all have same energy;
   
   
4. We may say the followings:
   1. diffusion process appears only in gaseous and liquid states;
   2. the kinetic energy of a molecule is affected by temperature, pressure and size of the molecule;
   3. the molecules have energy only in gaseous state;
   4. the molecules have energy in all gaseous, liquid and solid states;
   
   
5. The chronometer is used in the experiment for:
   1. measuring of the diffusion time;
   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. Ceata observata īn timpul experimentului se datoreaza:
   1. prezentei clorului;
   2. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   3. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   4. formarea clorurii de amoniu;
   
   
2. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   2. propagarea speciilor ca ionii si nu ca si molecule neutre;
   3. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   4. lungimea tubului si latimea tubului;
   5. concentratiile solutiilor utilizate;
   
   
3. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate se deplaseaza īn aceeasi directie;
   2. toate au aceeasi viteza;
   3. toate se īndreapta īntr-o directie arbitrara;
   4. toate au aceeasi energie;
   
   
4. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. proces de difuzie apare numai īn stare gazoasa si lichida;
   2. energia cinetica a unei molecule este afectata de temperatura, presiune si dimensiunea moleculei;
   3. moleculele au energie numai īn stare gazoasa;
   4. moleculele au energie īn toate starile gazoasa, lichida si solida;
   
   
5. Cronometrul este utilizat īn experimentul pentru:
   1. masurarea timpului de difuzie;
   2. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   3. sincronizarea timpilor de difuzie;
   4. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   5. sa ne tina ocupati;
   
   

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

1. We may say the followings:
   1. the molecules have energy only in gaseous state;
   2. the kinetic energy of a molecule is affected by temperature, pressure and size of the molecule;
   3. the molecules have speeds only in gaseous state;
   4. the molecules have speeds only in gaseous and liquid states;
   
   
2. At the ends of the tube following equilibrium reactions occurs:
   1. NH₃ + HCl \=\ NH₄Cl
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   
3. The time to the formation of the ring in the experiment is dependent on:
   1. the real speeds and not the virtual speeds of each involved species;
   2. the average energy or average speed of each involved species;
   3. the propagation of the species as neutral molecules and not as ions;
   4. the width of the tube and not of the length of the tube;
   
   
4. The fog observed during the experiment is due to:
   1. presence of the chlorine;
   2. formation of ammonium chloride;
   3. unproper illumination in the laboratory or our breathing;
   4. presence of the ammonia;
   
   
5. 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 have same energy;
   4. are considered to be at the same temperature, but may have different speeds;
   
   

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

1. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. moleculele au energie numai īn stare gazoasa;
   2. energia cinetica a unei molecule este afectata de temperatura, presiune si dimensiunea moleculei;
   3. moleculele au viteze numai īn stare gazoasa;
   4. moleculele au viteze numai īn stare gazoasa si lichida;
   
   
2. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₃ + HCl \=\ NH₄Cl
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   5. H⁺ + HO^- \=\ H₂O
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   2. energia medie sau viteza medie a fiecarei specii implicate;
   3. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   4. latimea tubului si nu lungimea tubului;
   5. viteza de difuzie a fiecarei specii implicate;
   
   
4. Ceata observata īn timpul experimentului se datoreaza:
   1. prezentei clorului;
   2. formarea clorurii de amoniu;
   3. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   4. prezentei amoniacului;
   
   
5. 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 au aceeasi energie;
   4. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   
   

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

1. The chronometer is used in the experiment for:
   1. extracting the information necessary to calculate the speeds ratio;
   2. to keep us busy;
   3. synchronization of the diffusion times;
   4. measuring of the diffusion time;
   
   
2. At the ends of the tube following equilibrium reactions occurs:
   1. HCl + H₂O \=\ Cl^- + H₃O⁺
   2. H₂O \=\ H⁺ + HO^-
   3. H⁺ + HO^- \=\ H₂O
   4. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
3. The fog observed during the experiment is due to:
   1. presence of the chlorine;
   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;
   
   
4. 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 length of the tube and the width of the tube;
   3. the concentrations of the solutions used;
   4. the mode energy or mode speed of each involved species;
   
   
5. 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. are considered to be at the same temperature, but may have different speeds;
   3. all have same speed;
   4. all have same energy;
   
   

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

1. Cronometrul este utilizat īn experimentul pentru:
   1. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   2. sa ne tina ocupati;
   3. sincronizarea timpilor de difuzie;
   4. masurarea timpului de difuzie;
   
   
2. La capetele tubului urmatoarele reactii de echilibru apar:
   1. HCl + H₂O \=\ Cl^- + H₃O⁺
   2. H₂O \=\ H⁺ + HO^-
   3. H⁺ + HO^- \=\ H₂O
   4. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
3. Ceata observata īn timpul experimentului se datoreaza:
   1. prezentei clorului;
   2. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   3. prezentei amoniacului;
   4. experimentului nostru proiectat pentru a captura produsul de reactie;
   
   
4. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   2. lungimea tubului si latimea tubului;
   3. concentratiile solutiilor utilizate;
   4. viteza la moda sau energia la moda a fiecarei specii implicate;
   5. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   
   
5. 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. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   3. toate au aceeasi viteza;
   4. toate au aceeasi energie;
   5. toate se īndreapta īntr-o directie arbitrara;
   
   

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. presence of the ammonia;
   2. our experiment designed to trap the product of the reaction;
   3. presence of the chlorine;
   4. unproper illumination in the laboratory and our breathing;
   
   
2. The time to the formation of the ring in the experiment is dependent on:
   1. the concentrations of the solutions used;
   2. the width of the tube and not of the length of the tube;
   3. the propagation of the species as ions and not as neutral molecules;
   4. the propagation of the species as neutral molecules and not as ions;
   
   
3. At the ends of the tube following equilibrium reactions occurs:
   1. H⁺ + HO^- \=\ H₂O
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. H₂O \=\ H⁺ + HO^-
   4. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   
   
4. We may say the followings:
   1. the molecules have speeds only in gaseous state;
   2. diffusion process appears in all gaseous, liquid and solid states;
   3. the molecules have speeds in all gaseous, liquid and solid states;
   4. diffusion process appears only in gaseous state;
   
   
5. The position of the ring in the experiment is dependent on:
   1. the speed of diffusion of each involved species;
   2. the propagation of the species as neutral molecules and not as ions;
   3. the mode energy or mode speed of each involved species;
   4. the concentrations of the solutions used;
   
   

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

1. Ceata observata īn timpul experimentului se datoreaza:
   1. prezentei amoniacului;
   2. experimentului nostru proiectat pentru a captura produsul de reactie;
   3. prezentei clorului;
   4. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   
   
2. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. concentratiile solutiilor utilizate;
   2. latimea tubului si nu lungimea tubului;
   3. propagarea speciilor ca ionii si nu ca si molecule neutre;
   4. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   
   
3. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H⁺ + HO^- \=\ H₂O
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. H₂O \=\ H⁺ + HO^-
   4. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   5. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   
4. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. moleculele au viteze numai īn stare gazoasa;
   2. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   3. moleculele au viteze īn toate starile gazoasa, lichida si solida;
   4. proces de difuzie apare numai īn stare gazoasa;
   
   
5. Pozitia inelului īn experimentul este dependenta de:
   1. viteza de difuzie a fiecarei specii implicate;
   2. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   3. viteza la moda sau energia la moda a fiecarei specii implicate;
   4. concentratiile solutiilor utilizate;
   5. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   
   

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 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 which may involve some constants dependent of gas composition;
   
   
2. 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 much higher than in liquid state;
   4. the pressure is unchanged when a chemical reaction occurs;
   
   
3. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   2. KCl + O₂ -> KClO₃;
   3. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   4. KNO₂ + O₂ -> KNO₃;
   
   
4. In the laboratory were studied:
   1. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   2. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   3. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   4. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   
   
5. 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. air were released as result of the decomposition;
   4. we do not possess enough information to decide what gas was released from the reaction;
   
   

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 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 care poate implica unele constante dependente de compozitia gazului;
   5. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   
   
2. 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 este mult mai mare decāt īn stare lichida;
   4. presiunea este neschimbata cānd apare o reactie chimica;
   
   
3. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   2. KCl + O₂ -> KClO₃;
   3. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   4. KNO₂ + O₂ -> KNO₃;
   
   
4. Īn laborator s-au studiat:
   1. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   2. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   3. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   4. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   
   
5. 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. aer a fost eliberat ca urmare a descompunerii;
   4. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   5. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   

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 worst the behavior of the released gas;
   2. as more simple 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. the ideal model of a gas approximated the best the behavior of the released gas;
   
   
2. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   2. H₂O + O₂ -> H₂O₂;
   3. opening a bubble water bottle;
   4. Ag₂O -> Ag + O₂;
   
   
3. In the laboratory were studied:
   1. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   2. the producing of some gas as result of a lost of the mass of a solid;
   3. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   4. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   
   
4. For gaseous state:
   1. the pressure is exactly the same as in liquid state;
   2. the pressure is much lower than in liquid state;
   3. the pressure is subject to change when a chemical reaction occurs;
   4. we need to take supplementary precautions in the laboratory;
   
   
5. 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 derived to approximate the relation between state parameters;
   4. usable in the laboratory, but is not to be used somewhere else;
   
   

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 rau comportamentul gazului eliberat;
   2. cu cat mai simplu 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. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   
   
2. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   2. H₂O + O₂ -> H₂O₂;
   3. deschiderea unei sticle de apa cu bule;
   4. Ag₂O -> Ag + O₂;
   
   
3. Īn laborator s-au studiat:
   1. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   2. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   3. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   4. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   
   
4. Pentru stare gazoasa:
   1. presiunea este exact la fel ca si īn stare lichida;
   2. presiunea este mult mai mica decāt īn stare lichida;
   3. presiunea se pot modifica atunci cānd apare o reactie chimica;
   4. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   5. presiunea este neschimbata cānd apare o reactie chimica;
   
   
5. 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 derivata pentru a aproxima relatia dintre parametrii de stare;
   4. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   5. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   
   

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

1. For gaseous state:
   1. the pressure is subject to change when a chemical reaction occurs;
   2. the pressure is much higher than in liquid state;
   3. the pressure is exactly the same as in liquid state;
   4. it exists an equation for all, p · V = n · R · T;
   
   
2. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. H₂O₂ -> H₂O + O₂;
   2. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   3. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   4. distillation of the liquid air;
   
   
3. 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. ozone were released as result of the decomposition;
   3. we do not possess enough information to decide what gas was released from the reaction;
   4. the ideal model of a gas approximated the worst the behavior of the released gas;
   
   
4. In the laboratory were studied:
   1. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   2. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   3. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   4. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   
   
5. A state equation for a real gas is:
   1. a relation which may involve some constants dependent of gas composition;
   2. a relation which takes into account certain deviations from the ideal model;
   3. a relation between an unlimited number of state parameters;
   4. a relation derived to approximate the relation between state parameters;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pentru stare gazoasa:
   1. presiunea se pot modifica atunci cānd apare o reactie chimica;
   2. presiunea este mult mai mare decāt īn stare lichida;
   3. presiunea este exact la fel ca si īn stare lichida;
   4. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   5. presiunea este neschimbata cānd apare o reactie chimica;
   
   
2. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. H₂O₂ -> H₂O + O₂;
   2. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   3. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   4. distilarea aerului lichid;
   5. KClO₃ -> KCl + O₂;
   
   
3. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   2. ozonul au fost eliberat ca urmare a descompunerii;
   3. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   4. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   5. oxigenul au fost eliberat ca urmare a descompunerii;
   
   
4. Īn laborator s-au studiat:
   1. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   2. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   3. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   4. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   5. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   
   
5. O ecuatie de stare pentru un gaz real este:
   1. o relatie care poate implica unele constante dependente de compozitia gazului;
   2. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   3. o relatie īntre un numar nelimitat de parametri de stare;
   4. 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 chlorate to potasium chloride when ozone is released;
   2. increasing of the temperature of a solid mass when was heated;
   3. the producing of some gas as result of a lost of the mass of a solid;
   4. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   
   
2. For gaseous state:
   1. the pressure depends on the model which are used to approximate it;
   2. the pressure is much higher than in liquid state;
   3. we need to take supplementary precautions in the laboratory;
   4. the pressure is much lower than in liquid state;
   
   
3. A state equation for a real gas is:
   1. a relation which may involve some constants dependent of gas composition;
   2. usable in the laboratory, but is not to be used somewhere else;
   3. a relation which is always true, independent of the values of the state parameters;
   4. a relation which takes into account certain deviations from the ideal model;
   
   
4. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   2. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   3. Ag + O₂ -> Ag₂O;
   4. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   
   
5. The values taken from the experiment conducted in the laboratory indicated that:
   1. oxigen were released as result of the decomposition;
   2. we do not possess enough information to decide what gas was released from the reaction;
   3. the ideal model of a gas approximated the best the behavior of the released gas;
   4. ozone were released as result of the decomposition;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Īn laborator s-au studiat:
   1. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   2. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   3. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   4. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   
   
2. Pentru stare gazoasa:
   1. presiunea depinde de modelul care este utilizat pentru o aproxima;
   2. presiunea este mult mai mare decāt īn stare lichida;
   3. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   4. presiunea este mult mai mica decāt īn stare lichida;
   5. presiunea este neschimbata cānd apare o reactie chimica;
   
   
3. O ecuatie de stare pentru un gaz real este:
   1. o relatie care poate implica unele constante dependente de compozitia gazului;
   2. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   3. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   4. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   
   
4. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   2. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   3. Ag + O₂ -> Ag₂O;
   4. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   5. KNO₃ -> KNO₂ + O₂;
   
   
5. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. oxigenul au fost eliberat ca urmare a descompunerii;
   2. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   3. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   4. ozonul au fost eliberat ca urmare a descompunerii;
   
   

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

1. For gaseous state:
   1. the pressure depends on the model which are used to approximate it;
   2. the pressure is approximately the same as in liquid state;
   3. the pressure is exactly the same as in liquid state;
   4. the pressure is much lower than in liquid state;
   
   
2. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   2. KCl + O₂ -> KClO₃;
   3. H₂O + O₂ -> H₂O₂;
   4. KNO₃ -> KNO₂ + O₂;
   
   
3. A state equation for a real gas is:
   1. a relation which is always true, independent of the values of the state parameters;
   2. a relation derived to approximate the relation between state parameters;
   3. a relation obtained after conducting of the experiment;
   4. a relation which takes into account certain deviations from the ideal model;
   
   
4. In the laboratory were studied:
   1. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   2. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   3. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   4. increasing of the temperature of a solid mass when was heated;
   
   
5. The values taken from the experiment conducted in the laboratory indicated that:
   1. oxigen were released as result of the decomposition;
   2. ozone 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 do not possess enough information to decide what gas was released from the reaction;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pentru stare gazoasa:
   1. presiunea depinde de modelul care este utilizat pentru o aproxima;
   2. presiunea este aproximativ aceeasi ca si īn stare lichida;
   3. presiunea este exact la fel ca si īn stare lichida;
   4. presiunea este mult mai mica decāt īn stare lichida;
   
   
2. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   2. KCl + O₂ -> KClO₃;
   3. H₂O + O₂ -> H₂O₂;
   4. KNO₃ -> KNO₂ + O₂;
   
   
3. O ecuatie de stare pentru un gaz real este:
   1. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   2. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   3. o relatie obtinut dupa efectuarea experimentului;
   4. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   5. o relatie care poate implica unele constante dependente de compozitia gazului;
   
   
4. Īn laborator s-au studiat:
   1. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   2. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   3. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   4. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   
   
5. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. oxigenul au fost eliberat ca urmare a descompunerii;
   2. ozonul au fost eliberat ca urmare a descompunerii;
   3. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   4. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   5. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   2. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   4. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   
   
2. When aluminum is identified:
   1. is identified as Al²⁺ cation;
   2. is identified as Al³⁺ cation;
   3. the presence of other ions may produce a false negative outcome;
   4. using of alizarin along with ammonium hidroxide provide a red colored complex;
   
   
3. The paper requires before analysis of the sample:
   1. to be burned;
   2. to be weighted;
   3. to be acidified;
   4. to be cut in small pieces;
   
   
4. Why moisten the paper with solution of sodium nitrate?
   1. to provide cations for analysis;
   2. for the paper to work as isolator;
   3. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   4. to be cut easily with scissors;
   
   
5. When the electrical circuit is closed:
   1. cations from the solution are passed into sample as metals;
   2. electric current passes the sample and the paper;
   3. elements from the solution are passed into sample as metals;
   4. surface of the sample is fastly covered by a protecting shield of electrons;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   2. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   4. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   
   
2. Cānd aluminiu este identificat:
   1. este identificat ca cationul Al²⁺;
   2. este identificat ca cationul Al³⁺;
   3. prezenta altor ioni poate produce un rezultat fals negativ;
   4. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un complex colorat rosu;
   
   
3. Hartia necesita ca īnainte de analiza probei:
   1. sa fie arsa;
   2. sa fie cantarita;
   3. sa fie acidulata;
   4. sa fie taiata īn bucati mici;
   5. sa fie testata;
   
   
4. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru furniza cationi pentru analiza;
   2. pentru ca hartia sa actioneze ca izolator;
   3. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   4. sa fie taiat cu usurinta cu foarfeca;
   5. sa ne acomodam in a utiliza substante chimice;
   
   
5. Cānd circuitul electric este īnchis:
   1. cationii din solutie sunt trecuti īn proba ca metale;
   2. curent electric trece prin proba si hārtie;
   3. elemente din solutie sunt trecute īn proba ca metale;
   4. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When the electrical circuit is closed:
   1. cations from the solution are passed into sample as metals;
   2. elements from the metals are passed into solution as cations;
   3. water dissociation is inhibited;
   4. electric current passes the sample and the paper;
   
   
2. Why moisten the paper with solution of sodium nitrate?
   1. to provide cations for analysis;
   2. to be cut easily with scissors;
   3. to accomodate ourselves to use chemicals;
   4. for stopping after a while the chemical reaction that takes place;
   
   
3. When lead is identified:
   1. interference of other ions may affect the outcome;
   2. a red-brown complex appears;
   3. precautions should be made for toxic wastes disposal;
   4. a yellow complex appears;
   
   
4. The paper requires before analysis of the sample:
   1. to be tested;
   2. to be cut in small pieces;
   3. to be weighted;
   4. to measure its surface;
   
   
5. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   2. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd circuitul electric este īnchis:
   1. cationii din solutie sunt trecuti īn proba ca metale;
   2. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   3. disocierea apei este inhibata;
   4. curent electric trece prin proba si hārtie;
   5. elemente din solutie sunt trecute īn proba ca metale;
   
   
2. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru furniza cationi pentru analiza;
   2. sa fie taiat cu usurinta cu foarfeca;
   3. sa ne acomodam in a utiliza substante chimice;
   4. pentru oprirea dupa un timp reactiei chimice care are loc;
   
   
3. Cānd plumbul este identificat:
   1. interferenta altor ioni poate afecta rezultatul;
   2. apare un complex rosu-brun;
   3. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   4. apare un complex galben;
   
   
4. Hartia necesita ca īnainte de analiza probei:
   1. sa fie testata;
   2. sa fie taiata īn bucati mici;
   3. sa fie cantarita;
   4. sa i se masoare suprafata;
   5. sa fie arsa;
   
   
5. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   2. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   

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⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
2. 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. to accomodate ourselves to use chemicals;
   3. to be cut easily with scissors;
   4. to have something to do in the laboratory;
   
   
3. This method of analysis of metals and alloys is:
   1. a gravimetric method of analysis;
   2. a quantitative method of analysis;
   3. a destructive method of analysis;
   4. useful for alloys, not so useful for metals;
   
   
4. When lead is identified:
   1. precautions should be made for toxic wastes disposal;
   2. dangerous substances are used;
   3. interference of other ions may affect the outcome;
   4. a blue complex appears;
   
   
5. The paper requires before analysis of the sample:
   1. to be tested;
   2. to be weighted;
   3. to be dry;
   4. to be cut in small pieces;
   
   

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⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
2. 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. sa ne acomodam in a utiliza substante chimice;
   3. sa fie taiat cu usurinta cu foarfeca;
   4. pentru a avea ceva de a face īn laborator;
   5. pentru oprirea dupa un timp reactiei chimice care are loc;
   
   
3. Aceasta metoda de analiza de metale si aliaje este:
   1. o metoda gravimetrica de analiza;
   2. o metoda cantitativa de analiza;
   3. o metoda distructiva de analiza;
   4. utila pentru aliaje, nu atāt de utila pentru metale;
   5. o metoda nedistructiva de analiza;
   
   
4. Cānd plumbul este identificat:
   1. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   2. sunt utilizate substante periculoase;
   3. interferenta altor ioni poate afecta rezultatul;
   4. apare un complex albastru;
   
   
5. Hartia necesita ca īnainte de analiza probei:
   1. sa fie testata;
   2. sa fie cantarita;
   3. sa fie uscata;
   4. sa fie taiata īn bucati mici;
   5. sa fie arsa;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. This method of analysis of metals and alloys is:
   1. a quantitative method of analysis;
   2. not useful for both metals and alloys;
   3. a destructive method of analysis;
   4. useful for alloys, not so useful for metals;
   
   
2. The paper requires before analysis of the sample:
   1. to be cut in small pieces;
   2. to measure its surface;
   3. to be tested;
   4. to be burned;
   
   
3. When aluminum is identified:
   1. is identified as Al³⁺ cation;
   2. using of ammonium hidroxide is enough in order to have a clear guess about the presence of aluminum;
   3. the presence of other ions may produce a false negative outcome;
   4. using of alizarin along with ammonium hidroxide provide a more selective indication about the presence of aluminum;
   
   
4. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   2. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   4. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   
5. When lead is identified:
   1. dangerous substances are used;
   2. interference of other ions may affect the outcome;
   3. a heat release is observed;
   4. a red-brown complex appears;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Aceasta metoda de analiza de metale si aliaje este:
   1. o metoda cantitativa de analiza;
   2. nu este utila nici pentru metale nici 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. Hartia necesita ca īnainte de analiza probei:
   1. sa fie taiata īn bucati mici;
   2. sa i se masoare suprafata;
   3. sa fie testata;
   4. sa fie arsa;
   5. sa fie umezita cu un electrolit;
   
   
3. Cānd aluminiu este identificat:
   1. este identificat ca cationul Al³⁺;
   2. folosirea hidroxidului de amoniu este suficient pentru a avea indicii clare cu privire la prezenta aluminiului;
   3. prezenta altor ioni poate produce un rezultat fals negativ;
   4. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un indiciu mai selectiv cu privire la prezenta aluminiului;
   
   
4. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   2. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   4. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   5. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
5. Cānd plumbul este identificat:
   1. sunt utilizate substante periculoase;
   2. interferenta altor ioni poate afecta rezultatul;
   3. se observa o eliberare de caldura;
   4. apare un complex rosu-brun;
   5. apare un complex violet;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. The paper requires before analysis of the sample:
   1. to measure its surface;
   2. to be tested;
   3. to be weighted;
   4. to be moistened with an electrolyte;
   
   
2. When the electrical circuit is closed:
   1. elements from the solution are passed into sample as metals;
   2. electric current avoids the sample and the paper;
   3. water dissociation is inhibited;
   4. electric current passes the sample and the paper;
   
   
3. Why moisten the paper with solution of sodium nitrate?
   1. to accomodate ourselves to use chemicals;
   2. for the paper to work as isolator;
   3. to have something to do in the laboratory;
   4. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   
   
4. When lead is identified:
   1. precautions should be made for toxic wastes disposal;
   2. the reactions used clearly indicates its presence;
   3. a blue complex appears;
   4. interference of other ions may affect the outcome;
   
   
5. 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⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   3. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   4. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Hartia necesita ca īnainte de analiza probei:
   1. sa i se masoare suprafata;
   2. sa fie testata;
   3. sa fie cantarita;
   4. sa fie umezita cu un electrolit;
   5. sa fie acidulata;
   
   
2. Cānd circuitul electric este īnchis:
   1. elemente din solutie sunt trecute īn proba ca metale;
   2. curent electric evita proba si hārtia;
   3. disocierea apei este inhibata;
   4. curent electric trece prin proba si hārtie;
   
   
3. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. sa ne acomodam in a utiliza substante chimice;
   2. pentru ca hartia sa actioneze ca izolator;
   3. pentru a avea ceva de a face īn laborator;
   4. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   5. pentru oprirea dupa un timp reactiei chimice care are loc;
   
   
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 albastru;
   4. interferenta altor ioni poate afecta rezultatul;
   5. apare un complex violet;
   
   
5. 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⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   3. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   4. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   5. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. When a chemical reaction is balanced, following should be considered:
   1. the liquid in the burette should be at the same level before and after conducting the experiment;
   2. the principle of the conservation of the number of atoms for each element;
   3. the principle of the conservation of the energy;
   4. the principle of the conservation of the volume;
   
   
2. Titration as a laboratory operation involves:
   1. a natrium hydroxide solution;
   2. a standard or referential reactive;
   3. a burette;
   4. a mass measurement;
   
   
3. Reactions between acids and bases:
   1. have as a consequence the dissolution of a salt;
   2. are all exothermic, being therefore dangerous outside of the laboratory;
   3. have as effect the change of the color of a solution;
   4. always have as a consequence the formation of a quantity of water;
   
   
4. The following chemical reactions were used in the experiments:
   1. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. H₂O + CO₂ -> H₂CO₃
   
   
5. In the calculations:
   1. are necessary to take some information from reagent bottles;
   2. are necessary to use some formulas expressing in different ways the concentration;
   3. are necessary to discuss with our colleagues;
   4. are necessary to draw the tables in our notebooks after completing of the experiment;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   2. principiul conservarii numarul de atomi pentru fiecare element;
   3. principiul conservarii energiei;
   4. principiul conservarii volumului;
   
   
2. Titrarea ca o operatiune de laborator implica:
   1. o solutie de hidroxid de sodiu;
   2. un standard sau reactiv de referinta;
   3. o biureta;
   4. masurarea masei;
   
   
3. Reactiile īntre acizi si baze:
   1. au drept consecinta dizolvarea unei sari;
   2. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   3. au ca efect schimbarea culorii unei solutii;
   4. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   5. sunt rareori utile, si chiar mai rar utilizate;
   
   
4. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. H₂O + CO₂ -> H₂CO₃
   5. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   
   
5. In calcule:
   1. este necesar a se lua unele informatii de pe sticlele de reactivi;
   2. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   3. este necesar sa discutam cu colegii;
   4. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   5. este necesar sa utilizam telefoanele;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. Titration as a laboratory operation involves:
   1. a natrium hydroxide solution;
   2. a burette;
   3. a mass measurement;
   4. an mixing of two ore more solutions;
   
   
2. A redox process:
   1. involves changing of the oxidation states of some participants to the reaction;
   2. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. occurs only when we mix wrong substances in the laboratory;
   4. is always fast and safe;
   
   
3. In the calculations:
   1. are necessary to draw the tables in our notebooks after completing of the experiment;
   2. are necessary to take some information from reagent bottles;
   3. are necessary to discuss with our colleagues;
   4. are necessary to establish the coefficients of the chemical reaction;
   
   
4. 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. only at the suggestion of the supervisor;
   4. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   
   
5. The following chemical reactions were used in the experiments:
   1. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   2. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. H₂O + CO₂ -> H₂CO₃
   4. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Titrarea ca o operatiune de laborator implica:
   1. o solutie de hidroxid de sodiu;
   2. o biureta;
   3. masurarea masei;
   4. amestecul a doua sau mai multe solutii;
   
   
2. Un proces redox:
   1. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   2. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. apare numai atunci cānd se amesteca substante gresit īn laborator;
   4. este īntotdeauna rapid si sigur;
   
   
3. In calcule:
   1. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   2. este necesar a se lua unele informatii de pe sticlele de reactivi;
   3. este necesar sa discutam cu colegii;
   4. este necesara stabilirea coeficientilor reactiei chimice;
   5. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   
   
4. 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. numai la sugestia supraveghetorului;
   4. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   5. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   
   
5. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   2. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. H₂O + CO₂ -> H₂CO₃
   4. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. In the calculations:
   1. are necessary to use some formulas expressing in different ways the concentration;
   2. are necessary to take the results imediatly after these are available from others;
   3. are necessary to establish the coefficients of the chemical reaction;
   4. are necessary to discuss with our colleagues;
   
   
2. The density of the solutions depends on:
   1. provider;
   2. temperature;
   3. quantity;
   4. concentration;
   
   
3. The following chemical reactions were used in the experiments:
   1. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   2. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. H₂O + CO₂ -> H₂CO₃
   
   
4. When a chemical reaction is balanced, following should be considered:
   1. all glassware should be clean before and after conducting the experiment;
   2. the principle of the conservation of the energy;
   3. the principle of the conservation of the volume;
   4. the liquid in the burette should be at the same level before and after conducting the experiment;
   
   
5. The equivalence point is:
   1. the point in which a reactive should be added in the reaction flask;
   2. indicated when a color change is observed into the solution;
   3. the point in which a reactive should be added in the burette;
   4. the point in which a reactive is fully consumed in the reaction;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. In calcule:
   1. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   2. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   3. este necesara stabilirea coeficientilor reactiei chimice;
   4. este necesar sa discutam cu colegii;
   
   
2. Densitatea solutiilor depinde de:
   1. furnizor;
   2. temperatura;
   3. cantitate;
   4. concentratie;
   
   
3. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   2. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. H₂O + CO₂ -> H₂CO₃
   5. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   
4. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   2. principiul conservarii energiei;
   3. principiul conservarii volumului;
   4. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   
   
5. Punctul de echivalenta este:
   1. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   2. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   3. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   4. punctul īn care un reactiv este consumat complet īn reactie;
   5. folosit pentru a echilibra ecuatia;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The density of the solutions depends on:
   1. pressure;
   2. time elapsed since were prepared;
   3. quantity;
   4. concentration;
   
   
2. The equivalence point is:
   1. the point in which a reactive is fully consumed in the reaction;
   2. something rarely encountered in chemistry;
   3. the point in which a reactive should be added in the reaction flask;
   4. the point in which a reactive should be added in the burette;
   
   
3. 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 energy;
   4. all glassware should be clean before and after conducting the experiment;
   
   
4. Reactions between acids and bases:
   1. have as effect the change of the color of a solution;
   2. always have as a consequence the formation of a quantity of water;
   3. are always fast, taking place almost instantaneously;
   4. are all exothermic, being therefore dangerous outside of the laboratory;
   
   
5. Titration as a laboratory operation involves:
   1. a mass measurement;
   2. an mixing of two ore more solutions;
   3. a volume measurement;
   4. a sulphuric acid solution;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Densitatea solutiilor depinde de:
   1. presiune;
   2. timpul scurs de cand au fost pregatite;
   3. cantitate;
   4. concentratie;
   5. temperatura;
   
   
2. Punctul de echivalenta este:
   1. punctul īn care un reactiv este consumat complet īn reactie;
   2. ceva rar īntālnit īn chimie;
   3. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   4. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   5. folosit pentru a echilibra ecuatia;
   
   
3. 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 energiei;
   4. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   5. principiul conservarii numarul de atomi pentru fiecare element;
   
   
4. Reactiile īntre acizi si baze:
   1. au ca efect schimbarea culorii unei solutii;
   2. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   3. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   4. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   5. sunt rareori utile, si chiar mai rar utilizate;
   
   
5. Titrarea ca o operatiune de laborator implica:
   1. masurarea masei;
   2. amestecul a doua sau mai multe solutii;
   3. masurarea volumului;
   4. o solutie de acid sulfuric;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The equivalence point is:
   1. used to balance the equation;
   2. the point in which a reactive should be added in the reaction flask;
   3. something rarely encountered in chemistry;
   4. the point in which a reactive is fully consumed in the reaction;
   
   
2. The density of the solutions depends on:
   1. time elapsed since were prepared;
   2. pressure;
   3. provider;
   4. concentration;
   
   
3. The following chemical reactions were used in the experiments:
   1. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   2. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. H₂O + CO₂ -> H₂CO₃
   
   
4. Titration as a laboratory operation involves:
   1. a natrium hydroxide solution;
   2. a pH-metter;
   3. a volume measurement;
   4. a salt solution;
   
   
5. In the calculations:
   1. are necessary to use our phones;
   2. are necessary to discuss with our colleagues;
   3. are necessary to take the results imediatly after these are available from others;
   4. are necessary to use some formulas expressing in different ways the concentration;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Punctul de echivalenta este:
   1. folosit pentru a echilibra ecuatia;
   2. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   3. ceva rar īntālnit īn chimie;
   4. punctul īn care un reactiv este consumat complet īn reactie;
   
   
2. Densitatea solutiilor depinde de:
   1. timpul scurs de cand au fost pregatite;
   2. presiune;
   3. furnizor;
   4. concentratie;
   
   
3. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   2. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. H₂O + CO₂ -> H₂CO₃
   5. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   
   
4. Titrarea ca o operatiune de laborator implica:
   1. o solutie de hidroxid de sodiu;
   2. un pH-metru;
   3. masurarea volumului;
   4. o solutie de sare;
   
   
5. In calcule:
   1. este necesar sa utilizam telefoanele;
   2. este necesar sa discutam cu colegii;
   3. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   4. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   5. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   2. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   3. HCl + HO^- -> H₂O + Cl^-
   4. HCl + CO₃^2- -> HCO₃^- + Cl^-
   
   
2. For a water sample following measures may be quantitatively expressed:
   1. permanent alkalinity;
   2. hardness;
   3. color;
   4. total alkalinity;
   
   
3. In the laboratory were analyzed:
   1. the mass of the water;
   2. the acidity of the water;
   3. the solubility of the water;
   4. the hardness of the water;
   
   
4. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   2. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   3. NaOH + HCOO^- -> HCOONa + HO^-
   4. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   
   
5. In the laboratory the water were:
   1. acidified for drinking purposes;
   2. alkalinized for drinking purposes;
   3. complexed by using EDTA titrimetric method;
   4. biologically purified using the resin column;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   2. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   3. HCl + HO^- -> H₂O+Cl^-
   4. HCl + CO₃^2- -> HCO₃^- + Cl^-
   5. HCl + HO⁺ -> H₂O + Cl⁺
   
   
2. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. alcalinitate permanenta;
   2. duritate;
   3. culoare;
   4. alcalinitate totala;
   5. puritate;
   
   
3. Īn laborator au fost analizate:
   1. masa apei;
   2. aciditatea apei;
   3. solubilitatea apei;
   4. duritatea apei;
   5. alcalinitatea apei;
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   2. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   3. NaOH + HCOO^- -> HCOONa + HO^-
   4. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   
   
5. In laborator apa au fost:
   1. acidulata pentru baut;
   2. alcalinizeaza pentru baut;
   3. complexata prin metoda titrimetrica EDTA;
   4. 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 + HO^- -> H₂O + Cl^-
   2. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   
   
2. We may say the followings:
   1. water is a good polar solvent;
   2. purification of the water may include physical processes;
   3. purification of the water may include chemical processes;
   4. purification of the water may include labeling processes;
   
   
3. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   3. HCl + CO₃^2- -> HCO₃^- + Cl^-
   4. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   
   
4. In the laboratory were analyzed:
   1. the alkalinity of the water;
   2. the hardness of the water;
   3. the temperature of the water;
   4. the softness of the water;
   
   
5. EDTA is used:
   1. as reagent for determining the hardness of the water;
   2. for complexing of Ca²⁺ and Mg²⁺ ions;
   3. for complexing of Na¹⁺ and K¹⁺ ions;
   4. for indication of the equilibrium point in the reaction;
   
   

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 + HO^- -> H₂O + Cl^-
   2. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   
   
2. Putem spune urmatoarele:
   1. apa este un solvent polar bun;
   2. purificarea apei poate include procedee fizice;
   3. purificarea apei poate include procese chimice;
   4. purificarea apei poate include procesele de etichetare;
   5. apa este buna pentru consum, nu este nimic de a fi analizat;
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   3. HCl + CO₃^2- -> HCO₃^- + Cl^-
   4. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   5. HCl + HO^- -> H₂O+Cl^-
   
   
4. Īn laborator au fost analizate:
   1. alcalinitatea apei;
   2. duritatea apei;
   3. temperatura apei;
   4. moliciunea apei;
   5. concentratia apei;
   
   
5. EDTA este utilizat:
   1. ca reactiv pentru determinarea duritatii apei;
   2. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   3. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   4. pentru indicarea punctului de echilibru īn reactie;
   5. pentru reīncarcarea rasinii la dedurizarea apei;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. We may say the followings:
   1. water is pure only when is taken from a good freshwater mountain stream;
   2. water is a good polar solvent;
   3. purification of the water may include chemical processes;
   4. purification of the water may include biological processes;
   
   
2. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + HO^- -> H₂O + Cl^-
   2. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   
   
3. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + Cl⁺ -> NaCl + HO⁺
   2. NaOH + NO₃^- -> NaNO₃ + HO^-
   3. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   4. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   
   
4. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + HCOO^- -> HCOONa + HO^-
   2. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   3. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   4. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   
   
5. For a water sample following measures may be quantitatively expressed:
   1. total alkalinity;
   2. total acidity;
   3. mineral acidity;
   4. hardness;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Putem spune urmatoarele:
   1. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   2. apa este un solvent polar bun;
   3. purificarea apei poate include procese chimice;
   4. purificarea apei poate include procese biologice;
   5. purificarea apei poate include procedee fizice;
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + HO^- -> H₂O + Cl^-
   2. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   5. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + Cl⁺ -> NaCl + HO⁺
   2. NaOH + NO₃^- -> NaNO₃ + HO^-
   3. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   4. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + HCOO^- -> HCOONa + HO^-
   2. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   3. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   4. NaOH + CO₃^2- -> HCO₃^- + HO^-
   5. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   
   
5. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. alcalinitate totala;
   2. aciditate totala;
   3. aciditate minerala;
   4. duritate;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   
2. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   2. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + CO₃^2- -> HCO₃^- + Cl^-
   
   
3. EDTA is used:
   1. for complexing of Ca²⁺ and Mg²⁺ ions;
   2. for recharging of the resin for water softening;
   3. for safety precautions purposes;
   4. as reagent for determining the hardness of the water;
   
   
4. In the laboratory were analyzed:
   1. the acidity of the water;
   2. the concentration of the water;
   3. the mass of the water;
   4. the boiling point of the water;
   
   
5. For a water sample following measures may be quantitatively expressed:
   1. total acidity;
   2. hardness;
   3. permanent alkalinity;
   4. color;
   
   

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 + PO₄^3- -> H₂PO₄^- + Cl^-
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   2. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + CO₃^2- -> HCO₃^- + Cl^-
   5. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   
   
3. EDTA este utilizat:
   1. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   2. pentru reīncarcarea rasinii la dedurizarea apei;
   3. ca masura de siguranta;
   4. ca reactiv pentru determinarea duritatii apei;
   
   
4. Īn laborator au fost analizate:
   1. aciditatea apei;
   2. concentratia apei;
   3. masa apei;
   4. punctul de fierbere al apei;
   5. moliciunea apei;
   
   
5. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. aciditate totala;
   2. duritate;
   3. alcalinitate permanenta;
   4. culoare;
   5. aciditate minerala;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. We may say the followings:
   1. purification of the water may include chemical processes;
   2. purification of the water may include biological processes;
   3. water is a good polar solvent;
   4. purification of the water may include physical processes;
   
   
2. EDTA is used:
   1. for safety precautions purposes;
   2. for complexing of Na¹⁺ and K¹⁺ ions;
   3. as reagent for determining the hardness of the water;
   4. for complexing of Ca²⁺ and Mg²⁺ ions;
   
   
3. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   2. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   3. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   4. NaOH + HCOO^- -> HCOONa + HO^-
   
   
4. In the laboratory the water were:
   1. acidified for drinking purposes;
   2. biologically purified using the resin column;
   3. softened using the resin column;
   4. alkalinized for drinking purposes;
   
   
5. For a water sample following measures may be quantitatively expressed:
   1. mineral acidity;
   2. total acidity;
   3. purity;
   4. total alkalinity;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Putem spune urmatoarele:
   1. purificarea apei poate include procese chimice;
   2. purificarea apei poate include procese biologice;
   3. apa este un solvent polar bun;
   4. purificarea apei poate include procedee fizice;
   
   
2. EDTA este utilizat:
   1. ca masura de siguranta;
   2. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   3. ca reactiv pentru determinarea duritatii apei;
   4. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   5. pentru indicarea punctului de echilibru īn reactie;
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   2. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   3. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   4. NaOH + HCOO^- -> HCOONa + HO^-
   
   
4. In laborator apa au fost:
   1. acidulata pentru baut;
   2. purificata biologic utilizānd coloana de rasina;
   3. dedurizata folosind coloana de rasina;
   4. alcalinizeaza pentru baut;
   
   
5. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. aciditate minerala;
   2. aciditate totala;
   3. puritate;
   4. alcalinitate totala;
   
   

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

1. The aluminum plate:
   1. was involved in the gravimetric method of corrosion analysis
   2. the surface is measured before and after immersing it in NaOH;
   3. the volume 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;
   
   
2. Which of the following reactions may be called as of corrosion:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. Ni(CO)₄ -> Ni + CO
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. H⁺ + Zn -> H₂ + Zn²⁺
   
   
3. 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 degreased in sulfuric acid solution;
   4. the mass is measured before and after immersing it in H₂SO₄;
   
   
4. Corrosion of metals:
   1. is the protection in time to chemical agents;
   2. can be reduced by electroplating;
   3. takes place merely from exposure to moisture in air;
   4. is the destruction of metals under the action of external factors;
   
   
5. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an cation;
   2. when a gas is released its volume depends on the amount of metal corroded;
   3. always the metal changes its oxidation state;
   4. a gas is released at both corrosion of zinc and aluminum;
   
   

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

1. Pentru placa de aluminiu:
   1. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   2. suprafata se masoara īnainte si dupa imersia īn NaOH;
   3. volumul se masoara īnainte si dupa imersia īn NaOH;
   4. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   5. a fost corodata īn solutie de hidroxid de sodiu;
   
   
2. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. Ni(CO)₄ -> Ni + CO
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. H⁺ + Zn -> H₂ + Zn²⁺
   5. ZnO + CO -> Zn + CO₂
   
   
3. 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 degresata īn solutie de acid sulfuric;
   4. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   
   
4. Coroziunea metalelor:
   1. este protectia de durata impotriva agentilor chimici;
   2. poate fi redusa prin galvanizare;
   3. are loc pur si simplu prin expunerea la umiditate īn aer;
   4. este distrugerea metalelor sub actiunea factorilor externi;
   5. este un proces benefic care arata stabilitatea metalelor;
   
   
5. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un cation;
   2. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   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;
   
   

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

1. The aluminum plate:
   1. was involved in the volumetric method of corrosion analysis
   2. was involved in the gravimetric method of corrosion analysis
   3. the mass is measured before and after immersing it in NaOH;
   4. was corroded in sodium hydroxide solution;
   
   
2. Which of the following reactions may be called as of corrosion:
   1. ZnO + CO -> Zn + CO₂
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
3. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an cation;
   2. a gas is released at both corrosion of zinc and aluminum;
   3. the metal it changes its oxidation state becoming an anion;
   4. a gas is released only the corrosion of zinc;
   
   
4. The zinc plate:
   1. was involved in the volumetric method of corrosion analysis
   2. the surface is measured before and after immersing it in H₂SO₄;
   3. the mass is measured before and after immersing it in H₂SO₄;
   4. the volume is measured before and after immersing it in H₂SO₄;
   
   
5. Corrosion of metals:
   1. is the protection in time to chemical agents;
   2. is helping in the process of cleaning the metals surfaces;
   3. can be reduced by passivation;
   4. takes place merely from exposure to moisture in air;
   
   

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

1. Pentru placa de aluminiu:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. masa este masurata īnainte si dupa imersia īn NaOH;
   4. a fost corodata īn solutie de hidroxid de sodiu;
   5. a fost degresata īn solutie de hidroxid de sodiu;
   
   
2. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. ZnO + CO -> Zn + CO₂
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
3. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un cation;
   2. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   3. metalul isi schimba starea de oxidare pentru a deveni un anion;
   4. un gaz este eliberat numai la corodarea zincului;
   
   
4. Pentru placa de zinc:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   3. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   4. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   
   
5. Coroziunea metalelor:
   1. este protectia de durata impotriva agentilor chimici;
   2. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   3. poate fi redusa prin pasivare;
   4. are loc pur si simplu prin expunerea la umiditate īn aer;
   5. este un proces benefic care arata stabilitatea metalelor;
   
   

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

1. The aluminum plate:
   1. was involved in the volumetric method of corrosion analysis
   2. was degreased in sodium hydroxide solution;
   3. was involved in the gravimetric method of corrosion analysis
   4. the surface is measured before and after immersing it in NaOH;
   
   
2. Corrosion of metals:
   1. can be reduced by electroplating;
   2. is helping in the process of cleaning the metals surfaces;
   3. is the destruction of metals under the action of external factors;
   4. takes place merely from exposure to moisture in air;
   
   
3. Which of the following reactions may be called as of corrosion:
   1. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. ZnO + CO -> Zn + CO₂
   
   
4. In studied corrosion processes:
   1. a gas is released only the corrosion of aluminum;
   2. a gas is released at both corrosion of zinc and aluminum;
   3. the metal it changes its oxidation state becoming an cation;
   4. a gas is released only the corrosion of zinc;
   
   
5. 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. was involved in the gravimetric method of corrosion analysis
   3. the mass is measured before and after immersing it in H₂SO₄;
   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. Pentru placa de aluminiu:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. a fost degresata īn solutie de hidroxid de sodiu;
   3. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   4. suprafata se masoara īnainte si dupa imersia īn NaOH;
   5. masa este masurata īnainte si dupa imersia īn NaOH;
   
   
2. Coroziunea metalelor:
   1. poate fi redusa prin galvanizare;
   2. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   3. este distrugerea metalelor sub actiunea factorilor externi;
   4. are loc pur si simplu prin expunerea la umiditate īn aer;
   
   
3. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. ZnO + CO -> Zn + CO₂
   
   
4. Īn procesele de coroziune studiate:
   1. un gaz este eliberat numai la corodarea aluminiului;
   2. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   3. metalul isi schimba starea de oxidare pentru a deveni un cation;
   4. un gaz este eliberat numai la corodarea zincului;
   5. īntotdeauna metalul isi schimba starea de oxidare;
   
   
5. Pentru placa de zinc:
   1. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   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 helping in the process of cleaning the metals surfaces;
   2. can be reduced by electroplating;
   3. is a beneficial process that shows the stability of metals;
   4. takes place merely from exposure to moisture in air;
   
   
2. 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 cation;
   3. a gas is released only the corrosion of aluminum;
   4. the metal it changes its oxidation state becoming an anion;
   
   
3. The aluminum plate:
   1. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   2. the mass is measured before and after immersing it in NaOH;
   3. the volume is measured before and after immersing it in NaOH;
   4. was degreased in sodium hydroxide solution;
   
   
4. The zinc plate:
   1. the surface 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 corroded in sulfuric solution;
   
   
5. Which of the following reactions may be called as of corrosion:
   1. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. Ni(CO)₄ -> Ni + CO
   4. H⁺ + Fe -> H₂ + Fe²⁺
   
   

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

1. Coroziunea metalelor:
   1. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   2. poate fi redusa prin galvanizare;
   3. este un proces benefic care arata stabilitatea metalelor;
   4. are loc pur si simplu prin expunerea la umiditate īn aer;
   5. este protectia de durata impotriva agentilor chimici;
   
   
2. 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 cation;
   3. un gaz este eliberat numai la corodarea aluminiului;
   4. metalul isi schimba starea de oxidare pentru a deveni un anion;
   
   
3. Pentru placa de aluminiu:
   1. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   2. masa este masurata īnainte si dupa imersia īn NaOH;
   3. volumul se masoara īnainte si dupa imersia īn NaOH;
   4. a fost degresata īn solutie de hidroxid de sodiu;
   5. a fost corodata īn solutie de hidroxid de sodiu;
   
   
4. Pentru placa de zinc:
   1. suprafata 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 corodata īn solutie sulfuric;
   
   
5. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. Ni(CO)₄ -> Ni + CO
   4. H⁺ + Fe -> H₂ + Fe²⁺
   
   

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

1. The zinc plate:
   1. was involved in the volumetric method of corrosion analysis
   2. was involved in the gravimetric method of corrosion analysis
   3. the surface is measured before and after immersing it in H₂SO₄;
   4. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   
   
2. 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 cation;
   3. always the metal changes its oxidation state;
   4. a gas is released only the corrosion of aluminum;
   
   
3. Corrosion of metals:
   1. can be reduced by electroplating;
   2. takes place merely from exposure to moisture in air;
   3. can be reduced by passivation;
   4. is helping in the process of cleaning the metals surfaces;
   
   
4. Which of the following reactions may be called as of corrosion:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. H⁺ + Zn -> H₂ + Zn²⁺
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. H⁺ + Fe -> H₂ + Fe²⁺
   
   
5. The aluminum plate:
   1. was involved in the volumetric method of corrosion analysis
   2. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   3. was corroded in sodium hydroxide solution;
   4. the volume is measured before and after immersing it in NaOH;
   
   

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

1. Pentru placa de zinc:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   4. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   
   
2. 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 cation;
   3. īntotdeauna metalul isi schimba starea de oxidare;
   4. un gaz este eliberat numai la corodarea aluminiului;
   
   
3. Coroziunea metalelor:
   1. poate fi redusa prin galvanizare;
   2. are loc pur si simplu prin expunerea la umiditate īn aer;
   3. poate fi redusa prin pasivare;
   4. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. H⁺ + Zn -> H₂ + Zn²⁺
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. H⁺ + Fe -> H₂ + Fe²⁺
   
   
5. Pentru placa de aluminiu:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   3. a fost corodata īn solutie de hidroxid de sodiu;
   4. volumul se masoara īnainte si dupa imersia īn NaOH;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. The intensity of the current:
   1. it depends on the surface of the sample;
   2. is to be adjusted when the experiment starts;
   3. is to be calculated after conducting the experiment;
   4. does not affect the quality nor the quantity of the nickel deposition;
   
   
2. It is expected to have a mass of nickel deposited:
   1. higher than the calculated theoretical one;
   2. proportional with the nickel plating time;
   3. much lower than the calculated theoretical one;
   4. much higher than the calculated theoretical one;
   
   
3. 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 cathode (-), connected with metallic piece, Ni⁰ - 2e^- -> Ni²⁺
   4. at cathode (-), connected with metallic piece, Ni²⁺ + 2e^- -> Ni⁰
   
   
4. Electrical conductivity of nickel salts solutions:
   1. is relatively high;
   2. is reduced by salts additions;
   3. is relatively small;
   4. is improved by salts additions;
   
   
5. Theoretical mass of nickel deposited is calculated using:
   1. the conservation of the number of atoms for each element law;
   2. the conservation of the energy law;
   3. perfect gas law;
   4. law of mass action;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. Electrical conductivity of nickel salts solutions:
   1. depends on the potential of the source used;
   2. is relatively high;
   3. is relatively small;
   4. depends on the intensity of the current used;
   
   
2. It is expected to have a mass of nickel deposited:
   1. much higher than the calculated theoretical one;
   2. inversely proportional with the intensity of the current used;
   3. much lower than the calculated theoretical one;
   4. higher than the calculated theoretical one;
   
   
3. The intensity of the current:
   1. is to be adjusted when the experiment starts;
   2. should be adjusted by the technicians, we have nothing to do there;
   3. is to be calculated after conducting the experiment;
   4. affect only the quantity of the nickel deposition;
   
   
4. Theoretical mass of nickel deposited is calculated using:
   1. the conservation of the energy law;
   2. solutions laws;
   3. law of mass action;
   4. the conservation of the number of atoms for each element law;
   
   
5. 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 anode: O^2- - 2e^- -> O₂⁰
   2. at cathode (-), connected with metallic piece, Ni⁰ - 2e^- -> Ni²⁺
   3. at anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   4. at anode (+), connected with nickel piece, Ni²⁺ + 2e^- -> Ni⁰
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. The intensity of the current:
   1. is to be adjusted when the experiment starts;
   2. affect only the quantity of the nickel deposition;
   3. is to be calculated after conducting the experiment;
   4. does not affect the quality nor the quantity of the nickel deposition;
   
   
2. 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 nickel plating time;
   4. proportional with the intensity of the current used;
   
   
3. 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 cathode: O^2- - 2e^- -> O₂⁰
   
   
4. 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;
   
   
5. Electrical conductivity of nickel salts solutions:
   1. depends on the intensity of the current used;
   2. is improved by salts additions;
   3. depends on the potential of the source used;
   4. is reduced by salts additions;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. Intensitatea curentului:
   1. trebuie sa fie ajustata cand se incepe experimentul;
   2. afecteaza numai cantitatea de nichel depus;
   3. se calculeaza dupa efectuarea experimentului;
   4. nu afecteaza calitatea nici cantitatea nichelului depus;
   5. afecteaza numai calitatea depunerii nichelului;
   
   
2. 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 proportional cu timpul de nichelare;
   4. proportionala cu intensitatea curentului utilizat;
   
   
3. 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 catod: O^2- - 2e^- -> O₂⁰
   
   
4. 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. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. depinde de intensitatea curentului utilizat;
   2. este īmbunatatita prin adaosuri de saruri;
   3. depinde de potentialul sursei utilizate;
   4. este redusa prin adaosuri de saruri;
   5. este relativ mare;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. It is expected to have a mass of nickel deposited:
   1. proportional with the intensity of the current used;
   2. inversely proportional with the intensity of the current used;
   3. higher than the calculated theoretical one;
   4. inversely proportional with the nickel plating time;
   
   
2. Electrical conductivity of nickel salts solutions:
   1. is reduced by salts additions;
   2. depends on the potential of the source used;
   3. depends on the intensity of the current used;
   4. is relatively small;
   
   
3. 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 high densities of current oxygen anions (O^2-) have the tendency to discharge at the cathode: O^2- - 2e^- -> O₂⁰
   4. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the anode: O^2- - 2e^- -> O₂⁰
   
   
4. The intensity of the current:
   1. affect only the quantity of the nickel deposition;
   2. it depends on the surface of the sample;
   3. affect only the quality of the nickel deposition;
   4. is to be calculated after conducting the experiment;
   
   
5. Theoretical mass of nickel deposited is calculated using:
   1. law of mass action;
   2. the electrolysis law;
   3. perfect gas law;
   4. solutions laws;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. Este de asteptat ca masa de nichel depus sa fie:
   1. proportionala cu intensitatea curentului utilizat;
   2. invers proportionala cu intensitatea curentului utilizat;
   3. mai mare decāt cea teoretica calculata;
   4. invers proportional cu timpul de nichelare;
   
   
2. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. este redusa prin adaosuri de saruri;
   2. depinde de potentialul sursei utilizate;
   3. depinde de intensitatea curentului utilizat;
   4. este relativ mica;
   5. este īmbunatatita prin adaosuri de saruri;
   
   
3. 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 densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la catod: O^2- - 2e^- -> O₂⁰
   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⁺
   
   
4. Intensitatea curentului:
   1. afecteaza numai cantitatea de nichel depus;
   2. depinde de suprafata probei;
   3. afecteaza numai calitatea depunerii nichelului;
   4. se calculeaza dupa efectuarea experimentului;
   
   
5. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea actiunii maselor;
   2. legea electrolizei;
   3. legea gazelor perfecte;
   4. legea solutilor;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. At the nickel plating following reactions took place:
   1. at anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   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 cathode: O^2- - 2e^- -> O₂⁰
   4. at cathode (-), connected with metallic piece, Ni²⁺ + 2e^- -> Ni⁰
   
   
2. The intensity of the current:
   1. affect only the quantity of the nickel deposition;
   2. should be adjusted by the technicians, we have nothing to do there;
   3. is to be calculated after conducting the experiment;
   4. it depends on the surface of the sample;
   
   
3. It is expected to have a mass of nickel deposited:
   1. proportional with the nickel plating time;
   2. lower than the calculated theoretical one;
   3. inversely proportional with the intensity of the current used;
   4. much higher than the calculated theoretical one;
   
   
4. Electrical conductivity of nickel salts solutions:
   1. is relatively high;
   2. is reduced by salts additions;
   3. is improved by salts additions;
   4. depends on the intensity of the current used;
   
   
5. Theoretical mass of nickel deposited is calculated using:
   1. law of mass action;
   2. perfect gas law;
   3. solutions laws;
   4. the electrolysis law;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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