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

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

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

1. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. lungimea tubului si latimea tubului;
   2. viteza de difuzie a fiecarei specii implicate;
   3. lungimea tubului si nu latimea tubului;
   4. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   
   
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. energia cinetica a unei molecule este afectata de temperatura si presiune;
   3. moleculele au energie numai īn stare gazoasa si lichida;
   4. moleculele au viteze numai īn stare gazoasa si lichida;
   5. moleculele au viteze numai īn stare gazoasa;
   
   
3. Cronometrul este utilizat īn experimentul pentru:
   1. masurarea timpului de difuzie;
   2. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   3. sincronizarea timpilor de difuzie;
   4. sa ne tina ocupati;
   
   
4. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₄⁺ + Cl^- \=\ NH₄Cl
   2. H⁺ + HO^- \=\ H₂O
   3. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   4. H₂O \=\ H⁺ + HO^-
   5. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   
5. Ceata observata īn timpul experimentului se datoreaza:
   1. experimentului nostru proiectat pentru a captura produsul de reactie;
   2. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   3. formarea clorurii de amoniu;
   4. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   
   

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

1. At the ends of the tube following equilibrium reactions occurs:
   1. NH₃ + HCl \=\ NH₄Cl
   2. H₂O \=\ H⁺ + HO^-
   3. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   
2. 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 energy;
   3. are considered to be at the same temperature, but may have different speeds;
   4. are considered to be at the same temperature, but may have different energies;
   
   
3. The position of the ring in the experiment is dependent on:
   1. the length of the tube and the width of the tube;
   2. the propagation of the species as ions and not as neutral molecules;
   3. the speed of diffusion of each involved species;
   4. the concentrations of the solutions used;
   
   
4. The time to the formation of the ring in the experiment is dependent on:
   1. the propagation of the species as ions and not as neutral molecules;
   2. the mode energy or mode speed of each involved species;
   3. the speed of diffusion of each involved species;
   4. the concentrations of the solutions used;
   
   
5. The fog observed during the experiment is due to:
   1. unproper illumination in the laboratory or our breathing;
   2. unproper illumination in the laboratory and our breathing;
   3. presence of the ammonia;
   4. formation of ammonium chloride;
   
   

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

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

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

1. At the ends of the tube following equilibrium reactions occurs:
   1. NH₃ + HCl \=\ NH₄Cl
   2. H₂O \=\ H⁺ + HO^-
   3. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   
2. The chronometer is used in the experiment for:
   1. extracting the information necessary to calculate the diffusion coefficients;
   2. measuring of the diffusion time;
   3. extracting the information necessary to calculate the speeds ratio;
   4. indication of the moment when we should pay attention to the experiment;
   
   
3. The time to the formation of the ring in the experiment is dependent on:
   1. the average energy or average speed of each involved species;
   2. the length of the tube and the width of the tube;
   3. the speed of diffusion of each involved species;
   4. the length of the tube and not of the width of the tube;
   
   
4. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all have same energy;
   2. all have same speed;
   3. all are moving in the same direction;
   4. are considered to be at the same temperature, but may have different energies;
   
   
5. The fog observed during the experiment is due to:
   1. formation of ammonium chloride;
   2. our experiment designed to trap the product of the reaction;
   3. presence of the ammonia;
   4. unproper illumination in the laboratory and our breathing;
   
   

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

1. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₃ + HCl \=\ NH₄Cl
   2. H₂O \=\ H⁺ + HO^-
   3. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   5. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
2. Cronometrul este utilizat īn experimentul pentru:
   1. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   2. masurarea timpului de difuzie;
   3. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   4. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. energia medie sau viteza medie a fiecarei specii implicate;
   2. lungimea tubului si latimea tubului;
   3. viteza de difuzie a fiecarei specii implicate;
   4. lungimea tubului si nu latimea tubului;
   
   
4. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate au aceeasi energie;
   2. toate au aceeasi viteza;
   3. toate se deplaseaza īn aceeasi directie;
   4. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   
   
5. Ceata observata īn timpul experimentului se datoreaza:
   1. formarea clorurii de amoniu;
   2. experimentului nostru proiectat pentru a captura produsul de reactie;
   3. prezentei amoniacului;
   4. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   
   

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

1. 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. to keep us busy;
   4. synchronization of the diffusion times;
   
   
2. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. are considered to be at the same temperature, but may have different energies;
   2. all are moving in the same direction;
   3. all have same energy;
   4. all have same speed;
   
   
3. At the ends of the tube following equilibrium reactions occurs:
   1. HCl + H₂O \=\ Cl^- + H₃O⁺
   2. H⁺ + HO^- \=\ H₂O
   3. H₂O \=\ H⁺ + HO^-
   4. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   
   
4. The position of the ring in the experiment is dependent on:
   1. the width of the tube and not of the length of the tube;
   2. the concentrations of the solutions used;
   3. the virtual speeds and not the real speeds of each involved species;
   4. the real speeds and not the virtual speeds of each involved species;
   
   
5. We may say the followings:
   1. the molecules have speeds only in gaseous and liquid states;
   2. the molecules have speeds in all gaseous, liquid and solid states;
   3. the molecules have energy in all gaseous, liquid and solid states;
   4. diffusion process appears only in gaseous state;
   
   

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

1. Cronometrul este utilizat īn experimentul pentru:
   1. masurarea timpului de difuzie;
   2. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   3. sa ne tina ocupati;
   4. sincronizarea timpilor de difuzie;
   5. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   
   
2. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   2. toate se deplaseaza īn aceeasi directie;
   3. toate au aceeasi energie;
   4. toate au aceeasi viteza;
   
   
3. La capetele tubului urmatoarele reactii de echilibru apar:
   1. HCl + H₂O \=\ Cl^- + H₃O⁺
   2. H⁺ + HO^- \=\ H₂O
   3. H₂O \=\ H⁺ + HO^-
   4. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   
   
4. Pozitia inelului īn experimentul este dependenta de:
   1. latimea tubului si nu lungimea tubului;
   2. concentratiile solutiilor utilizate;
   3. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   4. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   
   
5. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. moleculele au viteze numai īn stare gazoasa si lichida;
   2. moleculele au viteze īn toate starile gazoasa, lichida si solida;
   3. moleculele au energie īn toate starile gazoasa, lichida si solida;
   4. proces de difuzie apare numai īn stare gazoasa;
   
   

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

1. 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 average energy or average speed of each involved species;
   3. the propagation of the species as ions and not as neutral molecules;
   4. the virtual speeds and not the real speeds of each involved species;
   
   
2. At the ends of the tube following equilibrium reactions occurs:
   1. H⁺ + HO^- \=\ H₂O
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. HCl + H₂O \=\ Cl^- + H₃O⁺
   4. H₂O \=\ H⁺ + HO^-
   
   
3. The position of the ring in the experiment is dependent on:
   1. the length of the tube and the width of the tube;
   2. the real speeds and not the virtual speeds of each involved species;
   3. the virtual speeds and not the real speeds of each involved species;
   4. the average energy or average speed of each involved species;
   
   
4. The chronometer is used in the experiment for:
   1. measuring of the diffusion time;
   2. to keep us busy;
   3. extracting the information necessary to calculate the diffusion coefficients;
   4. indication of the moment when we should pay attention to the experiment;
   
   
5. The fog observed during the experiment is due to:
   1. presence of the chlorine;
   2. presence of the ammonia;
   3. formation of ammonium chloride;
   4. unproper illumination in the laboratory or our breathing;
   
   

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

1. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   2. energia medie sau viteza medie a fiecarei specii implicate;
   3. propagarea speciilor ca ionii si nu ca si molecule neutre;
   4. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   5. lungimea tubului si nu latimea tubului;
   
   
2. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H⁺ + HO^- \=\ H₂O
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. HCl + H₂O \=\ Cl^- + H₃O⁺
   4. H₂O \=\ H⁺ + HO^-
   5. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   
   
3. Pozitia inelului īn experimentul este dependenta de:
   1. lungimea tubului si latimea tubului;
   2. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   3. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   4. energia medie sau viteza medie a fiecarei specii implicate;
   
   
4. Cronometrul este utilizat īn experimentul pentru:
   1. masurarea timpului de difuzie;
   2. sa ne tina ocupati;
   3. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   4. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   5. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   
   
5. Ceata observata īn timpul experimentului se datoreaza:
   1. prezentei clorului;
   2. prezentei amoniacului;
   3. formarea clorurii de amoniu;
   4. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   5. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   
   

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. oxigen were released as result of the decomposition;
   2. the ideal model of a gas approximated the best the behavior of the released gas;
   3. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   4. we possess enough information to decide what gas was released from the reaction;
   
   
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. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   3. opening a bubble water bottle;
   4. Ag + O₂ -> Ag₂O;
   
   
3. A state equation for a real gas is:
   1. usable in the laboratory, but is not to be used somewhere else;
   2. a relation between an certain number of state parameters;
   3. a relation which is always true, independent of the values of the state parameters;
   4. a relation obtained after conducting of the experiment;
   
   
4. For gaseous state:
   1. the pressure is exactly the same as in liquid state;
   2. the pressure is approximately the same as in liquid state;
   3. the pressure is subject to change when a chemical reaction occurs;
   4. the pressure depends on the model which are used to approximate it;
   
   
5. In the laboratory were studied:
   1. the producing of some gas as result of a lost of the mass of a solid;
   2. increasing of the temperature of a solid mass when was heated;
   3. the lost of the mass of a solid as result of producing of some gas;
   4. increasing of the pressure of a gas when was heated;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. oxigenul au fost eliberat ca urmare a descompunerii;
   2. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   3. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   4. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   
2. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   2. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   3. deschiderea unei sticle de apa cu bule;
   4. Ag + O₂ -> Ag₂O;
   
   
3. O ecuatie de stare pentru un gaz real este:
   1. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   2. o relatie īntre un anumit numar de parametri de stare;
   3. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   4. o relatie obtinut dupa efectuarea experimentului;
   5. o relatie īntre un numar nelimitat de parametri de stare;
   
   
4. Pentru stare gazoasa:
   1. presiunea este exact la fel ca si īn stare lichida;
   2. presiunea este aproximativ aceeasi ca si īn stare lichida;
   3. presiunea se pot modifica atunci cānd apare o reactie chimica;
   4. presiunea depinde de modelul care este utilizat pentru o aproxima;
   5. presiunea este mult mai mare decāt īn stare lichida;
   
   
5. Īn laborator s-au studiat:
   1. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   2. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   3. pierdut din masa de solid ca urmare a producerii unor gaze;
   4. cresterea presiunii unui gaz cānd s-a īncalzit;
   
   

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

1. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   2. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   3. opening a bubble water bottle;
   4. H₂O + O₂ -> H₂O₂;
   
   
2. In the laboratory were studied:
   1. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   2. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   3. the producing of some gas as result of a lost of the mass of a solid;
   4. the lost of the mass of a solid as result of producing of some gas;
   
   
3. 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. we do not possess enough information to decide what gas was released from the reaction;
   3. ozone were released as result of the decomposition;
   4. the ideal model of a gas approximated the best the behavior of the released gas;
   
   
4. A state equation for a real gas is:
   1. a relation between an unlimited number of state parameters;
   2. usable in the laboratory, but is not to be used somewhere else;
   3. a relation which takes into account certain deviations from the ideal model;
   4. a relation between an certain number of state parameters;
   
   
5. For gaseous state:
   1. it exists an equation for all, p · V = n · R · T;
   2. the pressure is exactly the same as in liquid state;
   3. the pressure depends on the model which are used to approximate it;
   4. the pressure is unchanged when a chemical reaction occurs;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   2. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   3. deschiderea unei sticle de apa cu bule;
   4. H₂O + O₂ -> H₂O₂;
   
   
2. Īn laborator s-au studiat:
   1. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   2. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   3. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   4. pierdut din masa de solid ca urmare a producerii unor gaze;
   
   
3. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   2. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   3. ozonul au fost eliberat ca urmare a descompunerii;
   4. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   
   
4. O ecuatie de stare pentru un gaz real este:
   1. o relatie īntre un numar nelimitat de parametri de stare;
   2. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   3. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   4. o relatie īntre un anumit numar de parametri de stare;
   
   
5. Pentru stare gazoasa:
   1. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   2. presiunea este exact la fel ca si īn stare lichida;
   3. presiunea depinde de modelul care este utilizat pentru o aproxima;
   4. presiunea este neschimbata cānd apare o reactie chimica;
   5. presiunea este mult mai mica decāt īn stare lichida;
   
   

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

1. The values taken from the experiment conducted in the laboratory indicated that:
   1. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   2. we do not possess enough information to decide what gas was released from the reaction;
   3. air were released as result of the decomposition;
   4. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   
   
2. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KNO₂ + O₂ -> KNO₃;
   2. H₂O + O₂ -> H₂O₂;
   3. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   4. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   
   
3. A state equation for a real gas is:
   1. a relation which takes into account certain deviations from the ideal model;
   2. usable in the laboratory, but is not to be used somewhere else;
   3. a relation between an unlimited number of state parameters;
   4. a relation which is always true, independent of the values of the state parameters;
   
   
4. In the laboratory were studied:
   1. increasing of the pressure of a gas when was heated;
   2. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   3. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   4. the producing of some gas as result of a lost of the mass of a solid;
   
   
5. For gaseous state:
   1. we need to take supplementary precautions in the laboratory;
   2. the pressure is unchanged when a chemical reaction occurs;
   3. it exists an equation for all, p · V = n · R · T;
   4. the pressure is subject to change when a chemical reaction occurs;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   2. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   3. aer a fost eliberat ca urmare a descompunerii;
   4. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   
   
2. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KNO₂ + O₂ -> KNO₃;
   2. H₂O + O₂ -> H₂O₂;
   3. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   4. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   5. H₂O₂ -> H₂O + O₂;
   
   
3. O ecuatie de stare pentru un gaz real este:
   1. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   2. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   3. o relatie īntre un numar nelimitat de parametri de stare;
   4. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   
   
4. Īn laborator s-au studiat:
   1. cresterea presiunii unui gaz cānd s-a īncalzit;
   2. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   3. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   4. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   5. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   
   
5. Pentru stare gazoasa:
   1. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   2. presiunea este neschimbata cānd apare o reactie chimica;
   3. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   4. presiunea se pot modifica atunci cānd apare o reactie chimica;
   5. presiunea este aproximativ aceeasi ca si īn stare lichida;
   
   

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

1. In the laboratory were studied:
   1. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   2. increasing of the pressure of a gas when was heated;
   3. increasing of the temperature of a solid mass when was heated;
   4. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   
   
2. A state equation for a real gas is:
   1. a relation which takes into account certain deviations from the ideal model;
   2. a relation obtained after conducting of the experiment;
   3. usable in the laboratory, but is not to be used somewhere else;
   4. a relation which may involve some constants dependent of gas composition;
   
   
3. The values taken from the experiment conducted in the laboratory indicated that:
   1. oxigen were released as result of the decomposition;
   2. the ideal model of a gas approximated the best the behavior of the released gas;
   3. air were released as result of the decomposition;
   4. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   
   
4. For gaseous state:
   1. the pressure is approximately the same as in liquid state;
   2. the pressure is much lower than in liquid state;
   3. the pressure depends on the model which are used to approximate it;
   4. we need to take supplementary precautions in the laboratory;
   
   
5. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   2. opening a bubble water bottle;
   3. KNO₃ -> KNO₂ + O₂;
   4. KClO₃ -> KCl + O₂;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Īn laborator s-au studiat:
   1. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   2. cresterea presiunii unui gaz cānd s-a īncalzit;
   3. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   4. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   5. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   
   
2. O ecuatie de stare pentru un gaz real este:
   1. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   2. o relatie obtinut dupa efectuarea experimentului;
   3. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   4. o relatie care poate implica unele constante dependente de compozitia gazului;
   5. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   
   
3. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. oxigenul au fost eliberat ca urmare a descompunerii;
   2. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   3. aer a fost eliberat ca urmare a descompunerii;
   4. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   5. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   
   
4. Pentru stare gazoasa:
   1. presiunea este aproximativ aceeasi ca si īn stare lichida;
   2. presiunea este mult mai mica decāt īn stare lichida;
   3. presiunea depinde de modelul care este utilizat pentru o aproxima;
   4. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   
   
5. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   2. deschiderea unei sticle de apa cu bule;
   3. KNO₃ -> KNO₂ + O₂;
   4. KClO₃ -> KCl + O₂;
   5. H₂O + O₂ -> H₂O₂;
   
   

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. ozone were released as result of the decomposition;
   2. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   3. the ideal model of a gas approximated the best the behavior of the released gas;
   4. air were released as result of the decomposition;
   
   
2. A state equation for a real gas is:
   1. a relation between an unlimited number of state parameters;
   2. a relation between an certain number of state parameters;
   3. a relation which is always true, independent of the values of the state parameters;
   4. a relation obtained after conducting of the experiment;
   
   
3. For gaseous state:
   1. the pressure is exactly the same as in liquid state;
   2. the pressure is subject to change when a chemical reaction occurs;
   3. the pressure is unchanged when a chemical reaction occurs;
   4. it exists an equation for all, p · V = n · R · T;
   
   
4. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   2. H₂O + O₂ -> H₂O₂;
   3. KClO₃ -> KCl + O₂;
   4. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   
   
5. In the laboratory were studied:
   1. the lost of the mass of a solid as result of producing of some gas;
   2. the producing of some gas as result of a lost of the mass of a solid;
   3. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   4. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. ozonul au fost eliberat ca urmare a descompunerii;
   2. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   3. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   4. aer a fost eliberat ca urmare a descompunerii;
   
   
2. O ecuatie de stare pentru un gaz real este:
   1. o relatie īntre un numar nelimitat de parametri de stare;
   2. o relatie īntre un anumit numar de parametri de stare;
   3. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   4. o relatie obtinut dupa efectuarea experimentului;
   
   
3. Pentru stare gazoasa:
   1. presiunea este exact la fel ca si īn stare lichida;
   2. presiunea se pot modifica atunci cānd apare o reactie chimica;
   3. presiunea este neschimbata cānd apare o reactie chimica;
   4. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   
   
4. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   2. H₂O + O₂ -> H₂O₂;
   3. KClO₃ -> KCl + O₂;
   4. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   5. KNO₂ + O₂ -> KNO₃;
   
   
5. Īn laborator s-au studiat:
   1. pierdut din masa de solid ca urmare a producerii unor gaze;
   2. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   3. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   4. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   5. cresterea presiunii unui gaz cānd s-a īncalzit;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. Why moisten the paper with solution of sodium nitrate?
   1. to provide cations for analysis;
   2. to have something to do in the laboratory;
   3. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   4. to be cut easily with scissors;
   
   
2. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
3. When the electrical circuit is closed:
   1. electric current avoids the sample and the paper;
   2. water dissociation is inhibited;
   3. elements from the metals are passed into solution as cations;
   4. elements from the solution are passed into sample as metals;
   
   
4. When lead is identified:
   1. a red-brown complex appears;
   2. a yellow complex appears;
   3. the reactions used clearly indicates its presence;
   4. a heat release is observed;
   
   
5. The paper requires before analysis of the sample:
   1. to measure its surface;
   2. to be acidified;
   3. to be weighted;
   4. to be moistened with an electrolyte;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru furniza cationi pentru analiza;
   2. pentru a avea ceva de a face īn laborator;
   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. pentru ca hartia sa actioneze ca izolator;
   
   
2. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   5. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   
   
3. Cānd circuitul electric este īnchis:
   1. curent electric evita proba si hārtia;
   2. disocierea apei este inhibata;
   3. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   4. elemente din solutie sunt trecute īn proba ca metale;
   
   
4. Cānd plumbul este identificat:
   1. apare un complex rosu-brun;
   2. apare un complex galben;
   3. reactiile utilizate īn mod clar ii indica prezenta;
   4. se observa o eliberare de caldura;
   5. interferenta altor ioni poate afecta rezultatul;
   
   
5. Hartia necesita ca īnainte de analiza probei:
   1. sa i se masoare suprafata;
   2. sa fie acidulata;
   3. sa fie cantarita;
   4. sa fie umezita cu un electrolit;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When lead is identified:
   1. a violet complex appears;
   2. interference of other ions may affect the outcome;
   3. a blue complex appears;
   4. precautions should be made for toxic wastes disposal;
   
   
2. When aluminum is identified:
   1. is identified as Al²⁺ cation;
   2. is identified as Al¹⁺ cation;
   3. using of ammonium hidroxide is enough in order to have a clear guess about the presence of aluminum;
   4. the presence of other ions may produce a false positive outcome;
   
   
3. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   2. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   
4. The paper requires before analysis of the sample:
   1. to measure its surface;
   2. to be acidified;
   3. to be burned;
   4. to be dry;
   
   
5. Why moisten the paper with solution of sodium nitrate?
   1. to provide cations for analysis;
   2. to be cut easily with scissors;
   3. for stopping after a while the chemical reaction that takes place;
   4. for the paper to work as isolator;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd plumbul este identificat:
   1. apare un complex violet;
   2. interferenta altor ioni poate afecta rezultatul;
   3. apare un complex albastru;
   4. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   
   
2. Cānd aluminiu este identificat:
   1. este identificat ca cationul Al²⁺;
   2. este identificat ca cationul Al¹⁺;
   3. folosirea hidroxidului de amoniu este suficient pentru a avea indicii clare cu privire la prezenta aluminiului;
   4. prezenta altor ioni poate produce un rezultat fals pozitiv;
   5. este identificat ca cationul Al³⁺;
   
   
3. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   2. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   
4. Hartia necesita ca īnainte de analiza probei:
   1. sa i se masoare suprafata;
   2. sa fie acidulata;
   3. sa fie arsa;
   4. sa fie uscata;
   5. sa fie umezita cu un electrolit;
   
   
5. 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. pentru oprirea dupa un timp reactiei chimice care are loc;
   4. pentru ca hartia sa actioneze ca izolator;
   5. pentru a avea ceva de a face īn laborator;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When aluminum is identified:
   1. using of alizarin along with ammonium hidroxide provide a more selective indication about the presence of aluminum;
   2. is identified as Al¹⁺ cation;
   3. the presence of other ions may produce a false positive outcome;
   4. the presence of other ions may produce a true negative outcome;
   
   
2. When the electrical circuit is closed:
   1. electric current avoids the sample and the paper;
   2. elements from the metals are passed into solution as cations;
   3. cations from the solution are passed into sample as metals;
   4. surface of the sample is fastly covered by a protecting shield of electrons;
   
   
3. When lead is identified:
   1. a heat release is observed;
   2. a violet complex appears;
   3. dangerous substances are used;
   4. precautions should be made for toxic wastes disposal;
   
   
4. The paper requires before analysis of the sample:
   1. to measure its surface;
   2. to be dry;
   3. to be tested;
   4. to be moistened with an electrolyte;
   
   
5. This method of analysis of metals and alloys is:
   1. not useful for both metals and alloys;
   2. useful for both metals and alloys;
   3. a destructive method of analysis;
   4. useful for pure metals, not so useful for alloys;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd aluminiu este identificat:
   1. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un indiciu mai selectiv cu privire la prezenta aluminiului;
   2. este identificat ca cationul Al¹⁺;
   3. prezenta altor ioni poate produce un rezultat fals pozitiv;
   4. prezenta altor ioni poate produce un rezultat adevarat negativ;
   5. doar o reactie de identificare este posibila;
   
   
2. Cānd circuitul electric este īnchis:
   1. curent electric evita proba si hārtia;
   2. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   3. cationii din solutie sunt trecuti īn proba ca metale;
   4. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   
   
3. Cānd plumbul este identificat:
   1. se observa o eliberare de caldura;
   2. apare un complex violet;
   3. sunt utilizate substante periculoase;
   4. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   
   
4. Hartia necesita ca īnainte de analiza probei:
   1. sa i se masoare suprafata;
   2. sa fie uscata;
   3. sa fie testata;
   4. sa fie umezita cu un electrolit;
   
   
5. Aceasta metoda de analiza de metale si aliaje este:
   1. nu este utila nici pentru metale nici pentru aliaje;
   2. utila atāt pentru metale si aliaje;
   3. o metoda distructiva de analiza;
   4. utila pentru metale pure, nu atāt de utila pentru aliaje;
   5. o metoda nedistructiva de analiza;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When lead is identified:
   1. the reactions used clearly indicates its presence;
   2. interference of other ions may affect the outcome;
   3. a blue complex appears;
   4. a heat release is observed;
   
   
2. The paper requires before analysis of the sample:
   1. to be cut in small pieces;
   2. to be dry;
   3. to be weighted;
   4. to be burned;
   
   
3. Why moisten the paper with solution of sodium nitrate?
   1. to be cut easily with scissors;
   2. for stopping after a while the chemical reaction that takes place;
   3. to have something to do in the laboratory;
   4. to provide cations for analysis;
   
   
4. When aluminum is identified:
   1. the presence of other ions may produce a true negative outcome;
   2. there are many identification reactions possible;
   3. supplementary precautions should be taken, because the plates are made from aluminum too;
   4. is identified as Al²⁺ cation;
   
   
5. This method of analysis of metals and alloys is:
   1. not useful for both metals and alloys;
   2. useful for alloys, not so useful for metals;
   3. a nondestructive method of analysis;
   4. a quantitative method of analysis;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd plumbul este identificat:
   1. reactiile utilizate īn mod clar ii indica prezenta;
   2. interferenta altor ioni poate afecta rezultatul;
   3. apare un complex albastru;
   4. se observa o eliberare de caldura;
   
   
2. Hartia necesita ca īnainte de analiza probei:
   1. sa fie taiata īn bucati mici;
   2. sa fie uscata;
   3. sa fie cantarita;
   4. sa fie arsa;
   
   
3. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. sa fie taiat cu usurinta cu foarfeca;
   2. pentru oprirea dupa un timp reactiei chimice care are loc;
   3. pentru a avea ceva de a face īn laborator;
   4. pentru furniza cationi pentru analiza;
   
   
4. Cānd aluminiu este identificat:
   1. prezenta altor ioni poate produce un rezultat adevarat negativ;
   2. exista multe reactii posibile de identificare;
   3. ar trebui sa fie luate masuri de precautie suplimentare deoarece talerele sunt realizate din aluminiu deasemenea;
   4. este identificat ca cationul Al²⁺;
   
   
5. Aceasta metoda de analiza de metale si aliaje este:
   1. nu este utila nici pentru metale nici pentru aliaje;
   2. utila pentru aliaje, nu atāt de utila pentru metale;
   3. o metoda nedistructiva de analiza;
   4. o metoda cantitativa de analiza;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When aluminum is identified:
   1. supplementary precautions should be taken, because the plates are made from aluminum too;
   2. the presence of other ions may produce a false positive outcome;
   3. is identified as Al¹⁺ cation;
   4. only one identification reaction is possible;
   
   
2. When the electrical circuit is closed:
   1. electric current avoids the sample and the paper;
   2. electric current passes the sample and the paper;
   3. surface of the sample is fastly covered by a protecting shield of electrons;
   4. cations from the solution are passed into sample as metals;
   
   
3. When lead is identified:
   1. dangerous substances are used;
   2. a red-brown complex appears;
   3. a violet complex appears;
   4. precautions should be made for toxic wastes disposal;
   
   
4. Why moisten the paper with solution of sodium nitrate?
   1. for the paper to work as isolator;
   2. to be cut easily with scissors;
   3. to accomodate ourselves to use chemicals;
   4. to have something to do in the laboratory;
   
   
5. This method of analysis of metals and alloys is:
   1. useful for both metals and alloys;
   2. a nondestructive method of analysis;
   3. a gravimetric method of analysis;
   4. not useful for both metals and alloys;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd aluminiu este identificat:
   1. ar trebui sa fie luate masuri de precautie suplimentare deoarece talerele sunt realizate din aluminiu deasemenea;
   2. prezenta altor ioni poate produce un rezultat fals pozitiv;
   3. este identificat ca cationul Al¹⁺;
   4. doar o reactie de identificare este posibila;
   5. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un complex colorat rosu;
   
   
2. Cānd circuitul electric este īnchis:
   1. curent electric evita proba si hārtia;
   2. curent electric trece prin proba si hārtie;
   3. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   4. cationii din solutie sunt trecuti īn proba ca metale;
   5. elemente din solutie sunt trecute īn proba ca metale;
   
   
3. Cānd plumbul este identificat:
   1. sunt utilizate substante periculoase;
   2. apare un complex rosu-brun;
   3. apare un complex violet;
   4. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   
   
4. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru ca hartia sa actioneze ca izolator;
   2. sa fie taiat cu usurinta cu foarfeca;
   3. sa ne acomodam in a utiliza substante chimice;
   4. pentru a avea ceva de a face īn laborator;
   5. pentru furniza cationi pentru analiza;
   
   
5. Aceasta metoda de analiza de metale si aliaje este:
   1. utila atāt pentru metale si aliaje;
   2. o metoda nedistructiva de analiza;
   3. o metoda gravimetrica de analiza;
   4. nu este utila nici pentru metale nici pentru aliaje;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. A redox process:
   1. involves a transfer of electrons from one atom or group of atoms to another;
   2. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. involves changing of the aggregation states of some participants to the reaction;
   4. occurs only when we mix wrong substances in the laboratory;
   
   
2. Titration as a laboratory operation involves:
   1. a salt solution;
   2. a mass measurement;
   3. a standard or referential reactive;
   4. an mixing of two ore more solutions;
   
   
3. The indicator should be added:
   1. to indicate our safety limits when we dealt with chemicals;
   2. in small quantities, to avoid the errors in observations and in calculations;
   3. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   4. only at the suggestion of the supervisor;
   
   
4. 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 energy;
   3. the principle of the conservation of the number of atoms for each element;
   4. all glassware should be clean before, after and during the experiment;
   
   
5. The equivalence point is:
   1. something rarely encountered in chemistry;
   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. Un proces redox:
   1. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   2. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. implica schimbarea a starilor de agregare ale unor participanti la reactie;
   4. apare numai atunci cānd se amesteca substante gresit īn laborator;
   5. este īntotdeauna rapid si sigur;
   
   
2. Titrarea ca o operatiune de laborator implica:
   1. o solutie de sare;
   2. masurarea masei;
   3. un standard sau reactiv de referinta;
   4. amestecul a doua sau mai multe solutii;
   5. masurarea volumului;
   
   
3. Trebuie adaugat indicatorul:
   1. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   2. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   3. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   4. numai la sugestia supraveghetorului;
   5. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   
   
4. 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 energiei;
   3. principiul conservarii numarul de atomi pentru fiecare element;
   4. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   5. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   
   
5. Punctul de echivalenta este:
   1. ceva rar īntālnit īn chimie;
   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;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The indicator should be added:
   1. only in special cases, when the burette is graded from its bottom to its top;
   2. to provide a color change at equivalence point;
   3. only at the suggestion of the supervisor;
   4. to indicate our safety limits when we dealt with chemicals;
   
   
2. When a chemical reaction is balanced, following should be considered:
   1. all glassware should be clean before, after and during 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. all glassware should be clean before and after conducting the experiment;
   
   
3. Titration as a laboratory operation involves:
   1. a mass measurement;
   2. a standard or referential reactive;
   3. a volume measurement;
   4. a pH-metter;
   
   
4. The following chemical reactions were used in the experiments:
   1. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   
   
5. A redox process:
   1. occurs only when we mix wrong substances in the laboratory;
   2. is always fast and safe;
   3. involves changing of the oxidation states of some participants to the reaction;
   4. involves a transfer of electrons from one atom or group of atoms to another;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Trebuie adaugat indicatorul:
   1. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   2. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   3. numai la sugestia supraveghetorului;
   4. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   
   
2. 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. principiul conservarii numarul de atomi pentru fiecare element;
   3. principiul conservarii energiei;
   4. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   5. principiul conservarii volumului;
   
   
3. Titrarea ca o operatiune de laborator implica:
   1. masurarea masei;
   2. un standard sau reactiv de referinta;
   3. masurarea volumului;
   4. un pH-metru;
   
   
4. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   5. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   
5. Un proces redox:
   1. apare numai atunci cānd se amesteca substante gresit īn laborator;
   2. este īntotdeauna rapid si sigur;
   3. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   4. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the volume;
   2. all glassware should be clean before, after and during the experiment;
   3. all glassware should be clean before and after conducting the experiment;
   4. the principle of the conservation of the energy;
   
   
2. 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. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   4. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   
3. Titration as a laboratory operation involves:
   1. a salt solution;
   2. a pH indicator that changes color depending on the pH of the solution;
   3. an mixing of two ore more solutions;
   4. a standard or referential reactive;
   
   
4. The density of the solutions depends on:
   1. provider;
   2. temperature;
   3. time elapsed since were prepared;
   4. concentration;
   
   
5. The indicator should be added:
   1. to provide a color change at equivalence point;
   2. in small quantities, to avoid the errors in observations and in calculations;
   3. only in special cases, when the burette is graded from its bottom to its top;
   4. in large quantities, according to the principle 'only size matters';
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii volumului;
   2. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   3. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   4. principiul conservarii energiei;
   5. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   
   
2. 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. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   4. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   
3. Titrarea ca o operatiune de laborator implica:
   1. o solutie de sare;
   2. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   3. amestecul a doua sau mai multe solutii;
   4. un standard sau reactiv de referinta;
   5. masurarea masei;
   
   
4. Densitatea solutiilor depinde de:
   1. furnizor;
   2. temperatura;
   3. timpul scurs de cand au fost pregatite;
   4. concentratie;
   5. presiune;
   
   
5. Trebuie adaugat indicatorul:
   1. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   2. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   3. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   4. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. A redox process:
   1. is considered to be the following one: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   2. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. involves changing of the oxidation states of some participants to the reaction;
   4. involves a transfer of electrons from one atom or group of atoms to another;
   
   
2. The indicator should be added:
   1. only at the suggestion of the supervisor;
   2. only in special cases, when the burette is graded from its bottom to its top;
   3. to provide a color change at equivalence point;
   4. in large quantities, according to the principle 'only size matters';
   
   
3. Titration as a laboratory operation involves:
   1. a burette;
   2. a mass measurement;
   3. a sulphuric acid solution;
   4. a pH-metter;
   
   
4. The equivalence point is:
   1. something rarely encountered in chemistry;
   2. the point in which a reactive should be added in the burette;
   3. the point in which a reactive is fully consumed in the reaction;
   4. the point in which a reactive should be added in the reaction flask;
   
   
5. The following chemical reactions were used in the experiments:
   1. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   2. H₂O + CO₂ -> H₂CO₃
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Un proces redox:
   1. este considerat a fi urmatorul: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   2. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   4. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   5. apare numai atunci cānd se amesteca substante gresit īn laborator;
   
   
2. Trebuie adaugat indicatorul:
   1. numai la sugestia supraveghetorului;
   2. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   3. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   4. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   5. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   
   
3. Titrarea ca o operatiune de laborator implica:
   1. o biureta;
   2. masurarea masei;
   3. o solutie de acid sulfuric;
   4. un pH-metru;
   
   
4. Punctul de echivalenta este:
   1. ceva rar īntālnit īn chimie;
   2. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   3. punctul īn care un reactiv este consumat complet īn reactie;
   4. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   
   
5. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   2. H₂O + CO₂ -> H₂CO₃
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. In the calculations:
   1. are necessary to take the results imediatly after these are available from others;
   2. are necessary to establish the coefficients of the chemical reaction;
   3. are necessary to use some formulas expressing in different ways the concentration;
   4. are necessary to discuss with our colleagues;
   
   
2. The following chemical reactions were used in the experiments:
   1. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. H₂O + CO₂ -> H₂CO₃
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
3. The equivalence point is:
   1. something rarely encountered in chemistry;
   2. the point in which a reactive should be added in the burette;
   3. the point in which a reactive should be added in the reaction flask;
   4. the point in which a reactive is fully consumed in the reaction;
   
   
4. 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 energy;
   3. the principle of the conservation of the number of atoms for each element;
   4. all glassware should be clean before, after and during the experiment;
   
   
5. The density of the solutions depends on:
   1. concentration;
   2. time elapsed since were prepared;
   3. provider;
   4. quantity;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. In calcule:
   1. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   2. este necesara stabilirea coeficientilor reactiei chimice;
   3. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   4. este necesar sa discutam cu colegii;
   5. este necesar a se lua unele informatii de pe sticlele de reactivi;
   
   
2. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. H₂O + CO₂ -> H₂CO₃
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
3. Punctul de echivalenta este:
   1. ceva rar īntālnit īn chimie;
   2. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   3. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   4. punctul īn care un reactiv este consumat complet īn reactie;
   
   
4. 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 energiei;
   3. principiul conservarii numarul de atomi pentru fiecare element;
   4. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   
   
5. Densitatea solutiilor depinde de:
   1. concentratie;
   2. timpul scurs de cand au fost pregatite;
   3. furnizor;
   4. cantitate;
   5. temperatura;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. 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 + Cu²⁺ -> Cu(OH)₂ + Na⁺
   4. NaOH + HCOO^- -> HCOONa + HO^-
   
   
2. For a water sample following measures may be quantitatively expressed:
   1. color;
   2. hardness;
   3. purity;
   4. mineral acidity;
   
   
3. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + HO^- -> H₂O + Cl^-
   2. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   3. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
4. EDTA is used:
   1. for indication of the equilibrium point in the reaction;
   2. for complexing of Na¹⁺ and K¹⁺ ions;
   3. as reagent for determining the hardness of the water;
   4. for safety precautions purposes;
   
   
5. In the laboratory were analyzed:
   1. the solubility of the water;
   2. the color of the water;
   3. the mass of the water;
   4. the temperature of the water;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. 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 + Cu²⁺ -> Cu(OH)₂ + Na⁺
   4. NaOH + HCOO^- -> HCOONa + HO^-
   5. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   
   
2. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. culoare;
   2. duritate;
   3. puritate;
   4. aciditate minerala;
   5. aciditate totala;
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + HO^- -> H₂O + Cl^-
   2. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   3. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   5. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   
4. EDTA este utilizat:
   1. pentru indicarea punctului de echilibru īn reactie;
   2. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   3. ca reactiv pentru determinarea duritatii apei;
   4. ca masura de siguranta;
   5. pentru reīncarcarea rasinii la dedurizarea apei;
   
   
5. Īn laborator au fost analizate:
   1. solubilitatea apei;
   2. culoarea apei;
   3. masa apei;
   4. temperatura apei;
   5. moliciunea apei;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   2. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   3. NaOH + Cl⁺ -> NaCl + HO⁺
   4. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   
   
2. For a water sample following measures may be quantitatively expressed:
   1. total alkalinity;
   2. color;
   3. purity;
   4. mineral acidity;
   
   
3. We may say the followings:
   1. water is pure only when is taken from a good freshwater mountain stream;
   2. water is good for drinking, it is nothing to be analysed;
   3. purification of the water may include chemical processes;
   4. water is a good polar solvent;
   
   
4. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + HO^- -> H₂O + Cl^-
   2. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   
   
5. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   2. NaOH + HCOO^- -> HCOONa + HO^-
   3. NaOH + HCOO⁺ -> HCOONa + HO⁺
   4. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   2. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   3. NaOH + Cl⁺ -> NaCl + HO⁺
   4. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   
   
2. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. alcalinitate totala;
   2. culoare;
   3. puritate;
   4. aciditate minerala;
   
   
3. Putem spune urmatoarele:
   1. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   2. apa este buna pentru consum, nu este nimic de a fi analizat;
   3. purificarea apei poate include procese chimice;
   4. apa este un solvent polar bun;
   5. apa naturala poate contine materie organica si organisme vii;
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + HO^- -> H₂O + Cl^-
   2. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   5. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   2. NaOH + HCOO^- -> HCOONa + HO^-
   3. NaOH + HCOO⁺ -> HCOONa + HO⁺
   4. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   
   

FINAL TEST AT LABORATORY
Water analysis

1. We may say the followings:
   1. when water contains dissolved minerals and gases is bad for drinking;
   2. purification of the water may include physical processes;
   3. water is a good polar solvent;
   4. water is pure only when is taken from a good freshwater mountain stream;
   
   
2. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + CO₃^2- -> HCO₃^- + Cl^-
   2. HCl + HO⁺ -> H₂O + Cl⁺
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + HO^- -> H₂O + Cl^-
   
   
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 + Cl^- -> NaCl + HO^-
   
   
4. In the laboratory were analyzed:
   1. the softness of the water;
   2. the concentration of the water;
   3. the acidity of the water;
   4. the temperature of the water;
   
   
5. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   2. NaOH + HCOO^- -> HCOONa + HO^-
   3. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   4. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Putem spune urmatoarele:
   1. atunci cānd apa contine minerale dizolvate si gaze este rea pentru baut;
   2. purificarea apei poate include procedee fizice;
   3. apa este un solvent polar bun;
   4. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + CO₃^2- -> HCO₃^- + Cl^-
   2. HCl + HO⁺ -> H₂O + Cl⁺
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + HO^- -> H₂O+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 + Cl^- -> NaCl + HO^-
   
   
4. Īn laborator au fost analizate:
   1. moliciunea apei;
   2. concentratia apei;
   3. aciditatea apei;
   4. temperatura apei;
   5. punctul de fierbere al apei;
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   2. NaOH + HCOO^- -> HCOONa + HO^-
   3. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   4. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   2. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   3. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   4. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   
   
2. EDTA is used:
   1. for complexing of Na¹⁺ and K¹⁺ ions;
   2. for recharging of the resin for water softening;
   3. for indication of the equilibrium point in the reaction;
   4. for complexing of Ca²⁺ and Mg²⁺ ions;
   
   
3. In the laboratory were analyzed:
   1. the solubility of the water;
   2. the softness of the water;
   3. the color of the water;
   4. the temperature of the water;
   
   
4. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   2. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   3. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   4. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   
   
5. For a water sample following measures may be quantitatively expressed:
   1. purity;
   2. total alkalinity;
   3. color;
   4. permanent alkalinity;
   
   

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 + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   2. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   3. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   4. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   5. HCl + HO^- -> H₂O + Cl^-
   
   
2. EDTA este utilizat:
   1. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   2. pentru reīncarcarea rasinii la dedurizarea apei;
   3. pentru indicarea punctului de echilibru īn reactie;
   4. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   
   
3. Īn laborator au fost analizate:
   1. solubilitatea apei;
   2. moliciunea apei;
   3. culoarea apei;
   4. temperatura apei;
   5. masa apei;
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   2. NaOH + CO₃^2- -> HCO₃^- + HO^-
   3. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   4. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   5. NaOH + HCOO⁺ -> HCOONa + HO⁺
   
   
5. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. puritate;
   2. alcalinitate totala;
   3. culoare;
   4. alcalinitate permanenta;
   5. duritate;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + CO₃^2- -> HCO₃^- + Cl^-
   2. HCl + HO^- -> H₂O + Cl^-
   3. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   4. HCl + HO⁺ -> H₂O + Cl⁺
   
   
2. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + HO^- -> H₂O + Cl^-
   2. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   3. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
3. For a water sample following measures may be quantitatively expressed:
   1. mineral acidity;
   2. color;
   3. total acidity;
   4. purity;
   
   
4. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + NO₃^- -> NaNO₃ + HO^-
   2. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   3. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   4. NaOH + Cl^- -> NaCl + HO^-
   
   
5. In the laboratory the water were:
   1. softened using the resin column;
   2. complexed by using EDTA titrimetric method;
   3. alkalinized for drinking purposes;
   4. hardened 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 + CO₃^2- -> HCO₃^- + Cl^-
   2. HCl + HO^- -> H₂O+Cl^-
   3. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   4. HCl + HO⁺ -> H₂O + Cl⁺
   5. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + HO^- -> H₂O + Cl^-
   2. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   3. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   5. HCl + HO⁺ -> H₂O + Cl⁺
   
   
3. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. aciditate minerala;
   2. culoare;
   3. aciditate totala;
   4. puritate;
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + NO₃^- -> NaNO₃ + HO^-
   2. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   3. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   4. NaOH + Cl^- -> NaCl + HO^-
   
   
5. In laborator apa au fost:
   1. dedurizata folosind coloana de rasina;
   2. complexata prin metoda titrimetrica EDTA;
   3. alcalinizeaza pentru baut;
   4. calita folosind coloana de rasina;
   
   

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

1. The aluminum plate:
   1. was corroded in sodium hydroxide solution;
   2. the surface is measured before and after immersing it in NaOH;
   3. was degreased in sodium hydroxide solution;
   4. was involved in the volumetric method of corrosion analysis
   
   
2. The zinc plate:
   1. the volume is measured before and after immersing it in H₂SO₄;
   2. was involved in the gravimetric method of corrosion analysis
   3. the surface is measured before and after immersing it in H₂SO₄;
   4. was degreased in sulfuric acid solution;
   
   
3. Corrosion of metals:
   1. is the destruction of metals under the action of external factors;
   2. takes place merely from exposure to moisture in air;
   3. is a beneficial process that shows the stability of metals;
   4. is helping in the process of cleaning the metals surfaces;
   
   
4. Which of the following reactions may be called as of corrosion:
   1. ZnO + CO -> Zn + CO₂
   2. H⁺ + Ni -> H₂ + Ni²⁺
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. H⁺ + Fe -> H₂ + Fe²⁺
   
   
5. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an cation;
   2. the metal it changes its oxidation state becoming an anion;
   3. a gas is released only the corrosion of zinc;
   4. always the metal changes its oxidation state;
   
   

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

1. Pentru placa de aluminiu:
   1. a fost corodata īn solutie de hidroxid de sodiu;
   2. suprafata se masoara īnainte si dupa imersia īn NaOH;
   3. a fost degresata īn solutie de hidroxid de sodiu;
   4. a fost implicata īn metoda volumetrica de analiza a coroziunii
   
   
2. Pentru placa de zinc:
   1. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   4. a fost degresata īn solutie de acid sulfuric;
   
   
3. Coroziunea metalelor:
   1. este distrugerea metalelor sub actiunea factorilor externi;
   2. are loc pur si simplu prin expunerea la umiditate īn aer;
   3. este un proces benefic care arata stabilitatea metalelor;
   4. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. ZnO + CO -> Zn + CO₂
   2. H⁺ + Ni -> H₂ + Ni²⁺
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. H⁺ + Fe -> H₂ + Fe²⁺
   
   
5. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un cation;
   2. metalul isi schimba starea de oxidare pentru a deveni un anion;
   3. un gaz este eliberat numai la corodarea zincului;
   4. īntotdeauna metalul isi schimba starea de oxidare;
   
   

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

1. In studied corrosion processes:
   1. a gas is released at both corrosion of zinc and aluminum;
   2. always the metal changes its oxidation state;
   3. the metal it changes its oxidation state becoming an cation;
   4. when a gas is released its volume depends on the amount of metal corroded;
   
   
2. The aluminum plate:
   1. was degreased in sodium hydroxide solution;
   2. was corroded in sodium hydroxide solution;
   3. the surface is measured before and after immersing it in NaOH;
   4. was involved in the gravimetric method of corrosion analysis
   
   
3. The zinc plate:
   1. was involved in the volumetric method of corrosion analysis
   2. was involved in the gravimetric method of corrosion analysis
   3. was degreased in sulfuric acid solution;
   4. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   
   
4. Which of the following reactions may be called as of corrosion:
   1. H⁺ + Ni -> H₂ + Ni²⁺
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. ZnO + CO -> Zn + CO₂
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
5. Corrosion of metals:
   1. takes place merely from exposure to moisture in air;
   2. is the protection in time to chemical agents;
   3. can be reduced by passivation;
   4. is helping in the process of cleaning the metals surfaces;
   
   

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

1. Īn procesele de coroziune studiate:
   1. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   2. īntotdeauna metalul isi schimba starea de oxidare;
   3. metalul isi schimba starea de oxidare pentru a deveni un cation;
   4. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   5. metalul isi schimba starea de oxidare pentru a deveni un anion;
   
   
2. Pentru placa de aluminiu:
   1. a fost degresata īn solutie de hidroxid de sodiu;
   2. a fost corodata īn solutie de hidroxid de sodiu;
   3. suprafata se masoara īnainte si dupa imersia īn NaOH;
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   5. volumul se masoara īnainte si dupa imersia īn NaOH;
   
   
3. 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. a fost degresata īn solutie de acid sulfuric;
   4. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   5. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H⁺ + Ni -> H₂ + Ni²⁺
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. ZnO + CO -> Zn + CO₂
   4. Al₂O₃ + NaOH -> NaAlO₂
   5. H⁺ + Zn -> H₂ + Zn²⁺
   
   
5. Coroziunea metalelor:
   1. are loc pur si simplu prin expunerea la umiditate īn aer;
   2. este protectia de durata impotriva agentilor chimici;
   3. poate fi redusa prin pasivare;
   4. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   5. este distrugerea metalelor sub actiunea factorilor externi;
   
   

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

1. The aluminum plate:
   1. was corroded in sodium hydroxide solution;
   2. was involved in the volumetric method of corrosion analysis
   3. the volume is measured before and after immersing it in NaOH;
   4. the surface is measured before and after immersing it in NaOH;
   
   
2. In studied corrosion processes:
   1. a gas is released at both corrosion of zinc and aluminum;
   2. a gas is released only the corrosion of aluminum;
   3. the metal it changes its oxidation state becoming an anion;
   4. a gas is released only the corrosion of zinc;
   
   
3. The zinc plate:
   1. the mass is measured before and after immersing it in H₂SO₄;
   2. was degreased in sulfuric acid solution;
   3. was involved in the volumetric method of corrosion analysis
   4. was involved in the gravimetric method of corrosion analysis
   
   
4. Which of the following reactions may be called as of corrosion:
   1. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   2. ZnO + CO -> Zn + CO₂
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. H⁺ + Fe -> H₂ + Fe²⁺
   
   
5. Corrosion of metals:
   1. may provide useful raw materials for analysis;
   2. is helping in the process of cleaning the metals surfaces;
   3. is a beneficial process that shows the stability of metals;
   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 corodata īn solutie de hidroxid de sodiu;
   2. a fost implicata īn metoda volumetrica de analiza a coroziunii
   3. volumul se masoara īnainte si dupa imersia īn NaOH;
   4. suprafata se masoara īnainte si dupa imersia īn NaOH;
   
   
2. Īn procesele de coroziune studiate:
   1. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   2. un gaz este eliberat numai la corodarea aluminiului;
   3. metalul isi schimba starea de oxidare pentru a deveni un anion;
   4. un gaz este eliberat numai la corodarea zincului;
   5. īntotdeauna metalul isi schimba starea de oxidare;
   
   
3. Pentru placa de zinc:
   1. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   2. a fost degresata īn solutie de acid sulfuric;
   3. a fost implicata īn metoda volumetrica de analiza a coroziunii
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   5. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   2. ZnO + CO -> Zn + CO₂
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. H⁺ + Fe -> H₂ + Fe²⁺
   5. H⁺ + Zn -> H₂ + Zn²⁺
   
   
5. Coroziunea metalelor:
   1. poate furniza materii prime utile pentru analiza;
   2. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   3. este un proces benefic care arata stabilitatea metalelor;
   4. are loc pur si simplu prin expunerea la umiditate īn aer;
   
   

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 corroded in sodium hydroxide solution;
   3. the mass is measured before and after immersing it in NaOH;
   4. was involved in the gravimetric method of corrosion analysis
   
   
2. 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 corroded in sulfuric solution;
   3. was degreased in sulfuric acid solution;
   4. the mass is measured before and after immersing it in H₂SO₄;
   
   
3. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an cation;
   2. the metal it changes its oxidation state becoming an anion;
   3. always the metal changes its oxidation state;
   4. a gas is released only the corrosion of aluminum;
   
   
4. Corrosion of metals:
   1. is the protection in time to chemical agents;
   2. takes place merely from exposure to moisture in air;
   3. may provide useful raw materials for analysis;
   4. is the destruction of metals under the action of external factors;
   
   
5. Which of the following reactions may be called as of corrosion:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. H⁺ + Fe -> H₂ + Fe²⁺
   
   

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 corodata īn solutie de hidroxid de sodiu;
   3. masa este masurata īnainte si dupa imersia īn NaOH;
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   5. suprafata se masoara īnainte si dupa imersia īn NaOH;
   
   
2. Pentru placa de zinc:
   1. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   2. a fost corodata īn solutie sulfuric;
   3. a fost degresata īn solutie de acid sulfuric;
   4. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   
   
3. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un cation;
   2. metalul isi schimba starea de oxidare pentru a deveni un anion;
   3. īntotdeauna metalul isi schimba starea de oxidare;
   4. un gaz este eliberat numai la corodarea aluminiului;
   
   
4. Coroziunea metalelor:
   1. este protectia de durata impotriva agentilor chimici;
   2. are loc pur si simplu prin expunerea la umiditate īn aer;
   3. poate furniza materii prime utile pentru analiza;
   4. este distrugerea metalelor sub actiunea factorilor externi;
   
   
5. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. H⁺ + Fe -> H₂ + Fe²⁺
   5. ZnO + CO -> Zn + CO₂
   
   

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. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   4. the mass is measured before and after immersing it in NaOH;
   
   
2. Which of the following reactions may be called as of corrosion:
   1. H⁺ + Ni -> H₂ + Ni²⁺
   2. Ni(CO)₄ -> Ni + CO
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
3. In studied corrosion processes:
   1. always the metal changes its oxidation state;
   2. the metal it changes its oxidation state becoming an anion;
   3. the metal it changes its oxidation state becoming an cation;
   4. a gas is released at both corrosion of zinc and aluminum;
   
   
4. Corrosion of metals:
   1. can be reduced by electroplating;
   2. may provide useful raw materials for analysis;
   3. can be reduced by passivation;
   4. is a beneficial process that shows the stability of metals;
   
   
5. The zinc plate:
   1. the volume is measured before and after immersing it in H₂SO₄;
   2. was corroded in sulfuric solution;
   3. the surface is measured before and after immersing it in H₂SO₄;
   4. was involved in the volumetric method of corrosion analysis
   
   

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. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   4. masa este masurata īnainte si dupa imersia īn NaOH;
   
   
2. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H⁺ + Ni -> H₂ + Ni²⁺
   2. Ni(CO)₄ -> Ni + CO
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
3. Īn procesele de coroziune studiate:
   1. īntotdeauna metalul isi schimba starea de oxidare;
   2. metalul isi schimba starea de oxidare pentru a deveni un anion;
   3. metalul isi schimba starea de oxidare pentru a deveni un cation;
   4. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   5. un gaz este eliberat numai la corodarea zincului;
   
   
4. Coroziunea metalelor:
   1. poate fi redusa prin galvanizare;
   2. poate furniza materii prime utile pentru analiza;
   3. poate fi redusa prin pasivare;
   4. este un proces benefic care arata stabilitatea metalelor;
   
   
5. Pentru placa de zinc:
   1. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   2. a fost corodata īn solutie sulfuric;
   3. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   4. a fost implicata īn metoda volumetrica de analiza a coroziunii
   
   

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

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. It is expected to have a mass of nickel deposited:
   1. much lower than the calculated theoretical one;
   2. much higher than the calculated theoretical one;
   3. proportional with the surface of the sample;
   4. proportional with the intensity of the current used;
   
   
2. At the nickel plating following reactions took place:
   1. at cathode (-), connected with metallic piece, Ni²⁺ + 2e^- -> Ni⁰
   2. at anode (+), connected with nickel piece, Ni²⁺ + 2e^- -> Ni⁰
   3. at cathode (-), connected with metallic 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
   
   
3. Electrical conductivity of nickel salts solutions:
   1. depends on the intensity of the current used;
   2. depends on the potential of the source used;
   3. is improved by salts additions;
   4. is relatively high;
   
   
4. The intensity of the current:
   1. affect only the quality of the nickel deposition;
   2. is to be adjusted when the experiment starts;
   3. it depends on the surface of the sample;
   4. should be adjusted by the technicians, we have nothing to do there;
   
   
5. Theoretical mass of nickel deposited is calculated using:
   1. solutions laws;
   2. the conservation of the energy law;
   3. the conservation of the number of atoms for each element law;
   4. perfect gas law;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. The intensity of the current:
   1. is to be calculated before to start the experiment;
   2. it depends on the surface of the sample;
   3. is to be adjusted when the experiment starts;
   4. does not affect the quality nor the quantity of the nickel deposition;
   
   
2. At the nickel plating following reactions took place:
   1. at cathode (-), connected with metallic 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 anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   
   
3. It is expected to have a mass of nickel deposited:
   1. proportional with the surface of the sample;
   2. inversely proportional with the nickel plating time;
   3. proportional with the intensity of the current used;
   4. proportional with the nickel plating time;
   
   
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. is relatively high;
   2. depends on the intensity of the current used;
   3. is reduced by salts additions;
   4. depends on the potential of the source used;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. Intensitatea curentului:
   1. trebuie sa fie calculata īnainte de a īncepe experimentul;
   2. depinde de suprafata probei;
   3. trebuie sa fie ajustata cand se incepe experimentul;
   4. nu afecteaza calitatea nici cantitatea nichelului depus;
   
   
2. La nichelare urmatoarele reactii au avut loc:
   1. la catod (-), īn legatura cu piesa metalica, 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 anod (+), īn contact cu piesa de nichel, Ni⁰ - 2e^- -> Ni²⁺
   5. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la anod: O^2- - 2e^- -> O₂⁰
   
   
3. Este de asteptat ca masa de nichel depus sa fie:
   1. proportionala cu suprafata probei;
   2. invers proportional cu timpul de nichelare;
   3. proportionala cu intensitatea curentului utilizat;
   4. proportionala cu timpul de nichelare;
   5. mult mai mica decāt cea teoretica calculata;
   
   
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. este relativ mare;
   2. depinde de intensitatea curentului utilizat;
   3. este redusa prin adaosuri de saruri;
   4. depinde de potentialul sursei utilizate;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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