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 real speeds and not the virtual speeds of each involved species;
   2. the propagation of the species as ions and not as neutral molecules;
   3. the propagation of the species as neutral molecules and not as ions;
   4. the concentrations of the solutions used;
   
   
2. The chronometer is used in the experiment for:
   1. extracting the information necessary to calculate the speeds ratio;
   2. measuring of the diffusion time;
   3. extracting the information necessary to calculate the diffusion coefficients;
   4. synchronization of the diffusion times;
   
   
3. At the ends of the tube following equilibrium reactions occurs:
   1. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. H₂O \=\ H⁺ + HO^-
   4. NH₃ + HCl \=\ NH₄Cl
   
   
4. The position of the ring in the experiment is dependent on:
   1. the real speeds and not the virtual speeds of each involved species;
   2. the propagation of the species as neutral molecules and not as ions;
   3. the virtual speeds and not the real speeds of each involved species;
   4. the length of the tube and not of the width of the tube;
   
   
5. The fog observed during the experiment is due to:
   1. unproper illumination in the laboratory or our breathing;
   2. formation of ammonium chloride;
   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. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   2. propagarea speciilor ca ionii si nu ca si molecule neutre;
   3. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   4. concentratiile solutiilor utilizate;
   5. lungimea tubului si nu latimea tubului;
   
   
2. Cronometrul este utilizat īn experimentul pentru:
   1. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   2. masurarea timpului de difuzie;
   3. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   4. sincronizarea timpilor de difuzie;
   5. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   
   
3. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. H₂O \=\ H⁺ + HO^-
   4. NH₃ + HCl \=\ NH₄Cl
   5. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
4. Pozitia inelului īn experimentul este dependenta de:
   1. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   2. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   3. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   4. lungimea tubului si nu latimea tubului;
   
   
5. Ceata observata īn timpul experimentului se datoreaza:
   1. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   2. formarea clorurii de amoniu;
   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. synchronization of the diffusion times;
   2. extracting the information necessary to calculate the diffusion coefficients;
   3. measuring of the diffusion time;
   4. indication of the moment when we should pay attention to the experiment;
   
   
2. The fog observed during the experiment is due to:
   1. presence of the chlorine;
   2. unproper illumination in the laboratory and our breathing;
   3. presence of the ammonia;
   4. our experiment designed to trap the product of the reaction;
   
   
3. The position of the ring in the experiment is dependent on:
   1. the speed of diffusion of each involved species;
   2. the concentrations of the solutions used;
   3. the mode energy or mode speed of each involved species;
   4. the average energy or average speed of each involved species;
   
   
4. At the ends of the tube following equilibrium reactions occurs:
   1. H₂O \=\ H⁺ + HO^-
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. NH₃ + HCl \=\ NH₄Cl
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   
5. We may say the followings:
   1. diffusion process appears only in gaseous state;
   2. the molecules have energy only in gaseous state;
   3. the molecules have speeds only in gaseous and liquid states;
   4. diffusion process appears in all gaseous, liquid and solid states;
   
   

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

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

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

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

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

1. Ceata observata īn timpul experimentului se datoreaza:
   1. formarea clorurii de amoniu;
   2. prezentei amoniacului;
   3. experimentului nostru proiectat pentru a captura produsul de reactie;
   4. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   
   
2. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate au aceeasi viteza;
   2. toate se īndreapta īntr-o directie arbitrara;
   3. toate se deplaseaza īn aceeasi directie;
   4. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   
   
3. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   2. NH₃ + HCl \=\ NH₄Cl
   3. HCl + H₂O \=\ Cl^- + H₃O⁺
   4. H⁺ + HO^- \=\ H₂O
   5. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
4. Cronometrul este utilizat īn experimentul pentru:
   1. sincronizarea timpilor de difuzie;
   2. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   3. sa ne tina ocupati;
   4. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   
   
5. Pozitia inelului īn experimentul este dependenta de:
   1. concentratiile solutiilor utilizate;
   2. lungimea tubului si nu latimea tubului;
   3. latimea tubului si nu lungimea tubului;
   4. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   
   

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

1. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all have same energy;
   2. are considered to be at the same temperature, but may have different speeds;
   3. all have same speed;
   4. all are moving in the same direction;
   
   
2. The fog observed during the experiment is due to:
   1. unproper illumination in the laboratory or our breathing;
   2. our experiment designed to trap the product of the reaction;
   3. unproper illumination in the laboratory and our breathing;
   4. presence of the chlorine;
   
   
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 real speeds and not the virtual speeds of each involved species;
   3. the mode energy or mode speed of each involved species;
   4. the propagation of the species as neutral molecules and not as ions;
   
   
4. 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 speeds in all gaseous, liquid and solid states;
   4. the molecules have speeds only in gaseous and liquid states;
   
   
5. The chronometer is used in the experiment for:
   1. extracting the information necessary to calculate the diffusion coefficients;
   2. synchronization of the diffusion times;
   3. to keep us busy;
   4. extracting the information necessary to calculate the speeds ratio;
   
   

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

1. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate au aceeasi energie;
   2. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   3. toate au aceeasi viteza;
   4. toate se deplaseaza īn aceeasi directie;
   5. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   
   
2. Ceata observata īn timpul experimentului se datoreaza:
   1. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   2. experimentului nostru proiectat pentru a captura produsul de reactie;
   3. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   4. prezentei clorului;
   5. formarea clorurii de amoniu;
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. energia medie sau viteza medie a fiecarei specii implicate;
   2. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   3. viteza la moda sau energia la moda a fiecarei specii implicate;
   4. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   
   
4. 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 viteze īn toate starile gazoasa, lichida si solida;
   4. moleculele au viteze numai īn stare gazoasa si lichida;
   
   
5. Cronometrul este utilizat īn experimentul pentru:
   1. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   2. sincronizarea timpilor de difuzie;
   3. sa ne tina ocupati;
   4. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   
   

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

1. We may say the followings:
   1. the molecules have speeds in all gaseous, liquid and solid states;
   2. the molecules have energy in all gaseous, liquid and solid states;
   3. the molecules have speeds only in gaseous and liquid states;
   4. diffusion process appears only in gaseous state;
   
   
2. The chronometer is used in the experiment for:
   1. to keep us busy;
   2. measuring of the diffusion time;
   3. extracting the information necessary to calculate the diffusion coefficients;
   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 propagation of the species as neutral molecules and not as ions;
   2. the width of the tube and not of the length of the tube;
   3. the average energy or average speed of each involved species;
   4. the propagation of the species as ions and not as neutral molecules;
   
   
4. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all are moving in an arbitrary direction;
   2. are considered to be at the same temperature, but may have different speeds;
   3. all have same energy;
   4. all have same speed;
   
   
5. The fog observed during the experiment is due to:
   1. unproper illumination in the laboratory and our breathing;
   2. formation of ammonium chloride;
   3. unproper illumination in the laboratory or our breathing;
   4. presence of the ammonia;
   
   

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

1. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. moleculele au viteze īn toate starile gazoasa, lichida si solida;
   2. moleculele au energie īn toate starile gazoasa, lichida si solida;
   3. moleculele au viteze numai īn stare gazoasa si lichida;
   4. proces de difuzie apare numai īn stare gazoasa;
   5. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   
   
2. Cronometrul este utilizat īn experimentul pentru:
   1. sa ne tina ocupati;
   2. masurarea timpului de difuzie;
   3. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   4. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   2. latimea tubului si nu lungimea tubului;
   3. energia medie sau viteza medie a fiecarei specii implicate;
   4. propagarea speciilor ca ionii si nu ca si molecule neutre;
   
   
4. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate se īndreapta īntr-o directie arbitrara;
   2. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   3. toate au aceeasi energie;
   4. toate au aceeasi viteza;
   
   
5. Ceata observata īn timpul experimentului se datoreaza:
   1. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   2. formarea clorurii de amoniu;
   3. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   4. prezentei amoniacului;
   
   

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

1. A state equation for a real gas is:
   1. a relation between an unlimited number of state parameters;
   2. a relation obtained after conducting of the experiment;
   3. a relation which takes into account certain deviations from the ideal model;
   4. usable in the laboratory, but is not to be used somewhere else;
   
   
2. The values taken from the experiment conducted in the laboratory indicated that:
   1. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   2. ozone were released as result of the decomposition;
   3. we do not possess enough information to decide what gas was released from the reaction;
   4. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   
   
3. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KNO₃ -> KNO₂ + O₂;
   2. H₂O + O₂ -> H₂O₂;
   3. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   4. KNO₂ + O₂ -> KNO₃;
   
   
4. For gaseous state:
   1. the pressure is approximately the same as in liquid state;
   2. the pressure is subject to change when a chemical reaction occurs;
   3. the pressure is exactly the same as in liquid state;
   4. we need to take supplementary precautions in the laboratory;
   
   
5. In the laboratory were studied:
   1. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   2. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   3. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   4. the producing of some gas as result of a lost of the mass of a solid;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. O ecuatie de stare pentru un gaz real este:
   1. o relatie īntre un numar nelimitat de parametri de stare;
   2. o relatie obtinut dupa efectuarea experimentului;
   3. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   4. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   
   
2. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   2. ozonul au fost eliberat ca urmare a descompunerii;
   3. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   4. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   
   
3. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KNO₃ -> KNO₂ + O₂;
   2. H₂O + O₂ -> H₂O₂;
   3. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   4. KNO₂ + O₂ -> KNO₃;
   
   
4. Pentru stare gazoasa:
   1. presiunea este aproximativ aceeasi ca si īn stare lichida;
   2. presiunea se pot modifica atunci cānd apare o reactie chimica;
   3. presiunea este exact la fel ca si īn stare lichida;
   4. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   5. presiunea este neschimbata cānd apare o reactie chimica;
   
   
5. Īn laborator s-au studiat:
   1. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   2. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   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;
   
   

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. KCl + O₂ -> KClO₃;
   2. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   3. H₂O + O₂ -> H₂O₂;
   4. opening a bubble water bottle;
   
   
2. The values taken from the experiment conducted in the laboratory indicated that:
   1. we do not possess enough information to decide what gas was released from the reaction;
   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. the ideal model of a gas approximated the worst the behavior of the released gas;
   
   
3. For gaseous state:
   1. we need to take supplementary precautions in the laboratory;
   2. the pressure is much lower than in liquid state;
   3. the pressure is approximately the same as in liquid state;
   4. the pressure is subject to change when a chemical reaction occurs;
   
   
4. A state equation for a real gas is:
   1. a relation derived to approximate the relation between state parameters;
   2. a relation which may involve some constants dependent of gas composition;
   3. a relation between an unlimited number of state parameters;
   4. a relation between an certain number of state parameters;
   
   
5. In the laboratory were studied:
   1. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   2. the lost of the mass of a solid as result of producing of some gas;
   3. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   4. increasing of the temperature of a solid mass when was heated;
   
   

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. KCl + O₂ -> KClO₃;
   2. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   3. H₂O + O₂ -> H₂O₂;
   4. deschiderea unei sticle de apa cu bule;
   
   
2. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   2. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   3. aer a fost eliberat ca urmare a descompunerii;
   4. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   
   
3. Pentru stare gazoasa:
   1. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   2. presiunea este mult mai mica decāt īn stare lichida;
   3. presiunea este aproximativ aceeasi ca si īn stare lichida;
   4. presiunea se pot modifica atunci cānd apare o reactie chimica;
   5. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   
   
4. O ecuatie de stare pentru un gaz real este:
   1. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   2. o relatie care poate implica unele constante dependente de compozitia gazului;
   3. o relatie īntre un numar nelimitat de parametri de stare;
   4. o relatie īntre un anumit numar de parametri de stare;
   5. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   
   
5. Īn laborator s-au studiat:
   1. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   2. pierdut din masa de solid ca urmare a producerii unor gaze;
   3. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   4. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   5. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   
   

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. distillation of the liquid air;
   2. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   3. Ag₂O -> Ag + O₂;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   
2. In the laboratory were studied:
   1. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   2. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   3. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   4. increasing of the pressure of a gas when was heated;
   
   
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 unlimited number of state parameters;
   3. a relation derived to approximate the relation between state parameters;
   4. a relation which takes into account certain deviations from the ideal model;
   
   
4. 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. we possess enough information to decide what gas was released from the reaction;
   4. air were released as result of the decomposition;
   
   
5. For gaseous state:
   1. the pressure is much lower than in liquid state;
   2. the pressure is subject to change when a chemical reaction occurs;
   3. the pressure is exactly the same as in liquid state;
   4. the pressure is much higher than in liquid state;
   
   

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. distilarea aerului lichid;
   2. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   3. Ag₂O -> Ag + O₂;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   5. KClO₃ -> KCl + O₂;
   
   
2. Īn laborator s-au studiat:
   1. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   2. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   3. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   4. cresterea presiunii unui gaz cānd s-a īncalzit;
   5. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   
   
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 numar nelimitat de parametri de stare;
   3. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   4. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   
   
4. 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. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   4. aer a fost eliberat ca urmare a descompunerii;
   5. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   
   
5. Pentru stare gazoasa:
   1. presiunea este mult mai mica decāt īn stare lichida;
   2. presiunea se pot modifica atunci cānd apare o reactie chimica;
   3. presiunea este exact la fel ca si īn stare lichida;
   4. presiunea este mult mai mare decāt īn stare lichida;
   5. presiunea depinde de modelul care este utilizat pentru o aproxima;
   
   

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

1. A state equation for a real gas is:
   1. a relation between an certain number of state parameters;
   2. a relation obtained after conducting of the experiment;
   3. a relation which may involve some constants dependent of gas composition;
   4. a relation which takes into account certain deviations from the ideal model;
   
   
2. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. H₂O + O₂ -> H₂O₂;
   2. KCl + O₂ -> KClO₃;
   3. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   4. H₂O₂ -> H₂O + O₂;
   
   
3. For gaseous state:
   1. the pressure is much lower than in liquid state;
   2. the pressure depends on the model which are used to approximate it;
   3. it exists an equation for all, p · V = n · R · T;
   4. we need to take supplementary precautions in the laboratory;
   
   
4. In the laboratory were studied:
   1. the lost of the mass of a solid as result of producing of some gas;
   2. increasing of the temperature of a solid mass when was heated;
   3. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   4. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   
   
5. 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 worst the behavior of the released gas;
   4. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. O ecuatie de stare pentru un gaz real este:
   1. o relatie īntre un anumit numar de parametri de stare;
   2. o relatie obtinut dupa efectuarea experimentului;
   3. o relatie care poate implica unele constante dependente de compozitia gazului;
   4. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   5. o relatie īntre un numar nelimitat de parametri de stare;
   
   
2. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. H₂O + O₂ -> H₂O₂;
   2. KCl + O₂ -> KClO₃;
   3. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   4. H₂O₂ -> H₂O + O₂;
   
   
3. Pentru stare gazoasa:
   1. presiunea este mult mai mica decāt īn stare lichida;
   2. presiunea depinde de modelul care este utilizat pentru o aproxima;
   3. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   4. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   
   
4. Īn laborator s-au studiat:
   1. pierdut din masa de solid ca urmare a producerii unor gaze;
   2. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   3. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   4. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   5. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   
   
5. 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 rau comportamentul gazului eliberat;
   4. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   5. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   

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

1. For gaseous state:
   1. the pressure depends on the model which are used to approximate it;
   2. the pressure is unchanged when a chemical reaction occurs;
   3. the pressure is much lower than in liquid state;
   4. it exists an equation for all, p · V = n · R · T;
   
   
2. The values taken from the experiment conducted in the laboratory indicated that:
   1. ozone were released as result of the decomposition;
   2. oxigen were released as result of the decomposition;
   3. air were released as result of the decomposition;
   4. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   
   
3. A state equation for a real gas is:
   1. a relation between an certain number of state parameters;
   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 obtained after conducting of the experiment;
   
   
4. In the laboratory were studied:
   1. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   2. increasing of the pressure of a gas when was heated;
   3. the producing of some gas as result of a lost of the mass of a solid;
   4. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   
   
5. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KClO₃ -> KCl + O₂;
   2. opening a bubble water bottle;
   3. distillation of the liquid air;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pentru stare gazoasa:
   1. presiunea depinde de modelul care este utilizat pentru o aproxima;
   2. presiunea este neschimbata cānd apare o reactie chimica;
   3. presiunea este mult mai mica decāt īn stare lichida;
   4. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   
   
2. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. ozonul au fost eliberat ca urmare a descompunerii;
   2. oxigenul au fost eliberat ca urmare a descompunerii;
   3. aer a fost eliberat ca urmare a descompunerii;
   4. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   
   
3. O ecuatie de stare pentru un gaz real este:
   1. o relatie īntre un anumit numar de parametri de stare;
   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 obtinut dupa efectuarea experimentului;
   
   
4. Īn laborator s-au studiat:
   1. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   2. cresterea presiunii unui gaz cānd s-a īncalzit;
   3. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   4. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   
   
5. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KClO₃ -> KCl + O₂;
   2. deschiderea unei sticle de apa cu bule;
   3. distilarea aerului lichid;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. This method of analysis of metals and alloys is:
   1. too ancient to be used today in the laboratory;
   2. a destructive method of analysis;
   3. a nondestructive method of analysis;
   4. a gravimetric method of analysis;
   
   
2. When aluminum is identified:
   1. supplementary precautions should be taken, because the plates are made from aluminum too;
   2. using of alizarin along with ammonium hidroxide provide a red colored complex;
   3. is identified as Al¹⁺ cation;
   4. the presence of other ions may produce a true positive outcome;
   
   
3. When lead is identified:
   1. dangerous substances are used;
   2. the reactions used clearly indicates its presence;
   3. a red-brown complex appears;
   4. a yellow complex appears;
   
   
4. When the electrical circuit is closed:
   1. elements from the metals are passed into solution as anions;
   2. elements from the metals are passed into solution as cations;
   3. water dissociation is inhibited;
   4. anions from the solution are passed into sample as metals;
   
   
5. Why moisten the paper with solution of sodium nitrate?
   1. for stopping after a while the chemical reaction that takes place;
   2. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   3. to have something to do in the laboratory;
   4. for the paper to work as isolator;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Aceasta metoda de analiza de metale si aliaje este:
   1. prea veche pentru a fi utilizata īn prezent īn laborator;
   2. o metoda distructiva de analiza;
   3. o metoda nedistructiva de analiza;
   4. o metoda gravimetrica de analiza;
   
   
2. Cānd aluminiu este identificat:
   1. ar trebui sa fie luate masuri de precautie suplimentare deoarece talerele sunt realizate din aluminiu deasemenea;
   2. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un complex colorat rosu;
   3. este identificat ca cationul Al¹⁺;
   4. prezenta altor ioni poate produce un rezultat adevarat pozitiv;
   5. este identificat ca cationul Al³⁺;
   
   
3. Cānd plumbul este identificat:
   1. sunt utilizate substante periculoase;
   2. reactiile utilizate īn mod clar ii indica prezenta;
   3. apare un complex rosu-brun;
   4. apare un complex galben;
   
   
4. Cānd circuitul electric este īnchis:
   1. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   2. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   3. disocierea apei este inhibata;
   4. anionii din solutie sunt trecuti īn proba ca metale;
   5. cationii din solutie sunt trecuti īn proba ca metale;
   
   
5. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru oprirea dupa un timp reactiei chimice care are loc;
   2. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   3. pentru a avea ceva de a face īn laborator;
   4. pentru ca hartia sa actioneze ca izolator;
   5. sa fie taiat cu usurinta cu foarfeca;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. The electric charges after passing the metals into solution may be:
   1. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   2. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   3. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
2. The paper requires before analysis of the sample:
   1. to be acidified;
   2. to be moistened with an electrolyte;
   3. to be dry;
   4. to be burned;
   
   
3. When the electrical circuit is closed:
   1. elements from the metals are passed into solution as cations;
   2. water dissociation is inhibited;
   3. electric current passes the sample and the paper;
   4. elements from the solution are passed into sample as metals;
   
   
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 have something to do in the laboratory;
   4. for stopping after a while the chemical reaction that takes place;
   
   
5. When aluminum is identified:
   1. the presence of other ions may produce a true positive outcome;
   2. there are many identification reactions possible;
   3. using of ammonium hidroxide is enough in order to have a clear guess about the presence of aluminum;
   4. is identified as Al³⁺ cation;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   2. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   3. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
2. Hartia necesita ca īnainte de analiza probei:
   1. sa fie acidulata;
   2. sa fie umezita cu un electrolit;
   3. sa fie uscata;
   4. sa fie arsa;
   5. sa fie taiata īn bucati mici;
   
   
3. Cānd circuitul electric este īnchis:
   1. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   2. disocierea apei este inhibata;
   3. curent electric trece prin proba si hārtie;
   4. elemente din solutie sunt trecute īn proba ca metale;
   5. curent electric evita proba si hārtia;
   
   
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. pentru a avea ceva de a face īn laborator;
   4. pentru oprirea dupa un timp reactiei chimice care are loc;
   5. pentru furniza cationi pentru analiza;
   
   
5. Cānd aluminiu este identificat:
   1. prezenta altor ioni poate produce un rezultat adevarat pozitiv;
   2. exista multe reactii posibile de identificare;
   3. folosirea hidroxidului de amoniu este suficient pentru a avea indicii clare cu privire la prezenta aluminiului;
   4. este identificat ca cationul Al³⁺;
   5. este identificat ca cationul Al¹⁺;
   
   

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 accomodate ourselves to use chemicals;
   4. to be cut easily with scissors;
   
   
2. When lead is identified:
   1. a heat release is observed;
   2. a yellow complex appears;
   3. a blue complex appears;
   4. interference of other ions may affect the outcome;
   
   
3. The paper requires before analysis of the sample:
   1. to be cut in small pieces;
   2. to be weighted;
   3. to measure its surface;
   4. to be burned;
   
   
4. When aluminum is identified:
   1. only one identification reaction is possible;
   2. supplementary precautions should be taken, because the plates are made from aluminum too;
   3. is identified as Al¹⁺ cation;
   4. using of alizarin along with ammonium hidroxide provide a more selective indication about the presence of aluminum;
   
   
5. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   2. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   4. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   
   

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. sa ne acomodam in a utiliza substante chimice;
   4. sa fie taiat cu usurinta cu foarfeca;
   5. pentru oprirea dupa un timp reactiei chimice care are loc;
   
   
2. Cānd plumbul este identificat:
   1. se observa o eliberare de caldura;
   2. apare un complex galben;
   3. apare un complex albastru;
   4. interferenta altor ioni poate afecta rezultatul;
   5. reactiile utilizate īn mod clar ii indica prezenta;
   
   
3. Hartia necesita ca īnainte de analiza probei:
   1. sa fie taiata īn bucati mici;
   2. sa fie cantarita;
   3. sa i se masoare suprafata;
   4. sa fie arsa;
   
   
4. Cānd aluminiu este identificat:
   1. doar o reactie de identificare este posibila;
   2. ar trebui sa fie luate masuri de precautie suplimentare deoarece talerele sunt realizate din aluminiu deasemenea;
   3. este identificat ca cationul Al¹⁺;
   4. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un indiciu mai selectiv cu privire la prezenta aluminiului;
   5. prezenta altor ioni poate produce un rezultat adevarat negativ;
   
   
5. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   2. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   4. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   5. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When the electrical circuit is closed:
   1. cations from the solution are passed into sample as metals;
   2. electric current passes the sample and the paper;
   3. water dissociation is inhibited;
   4. anions from the solution are passed into sample as metals;
   
   
2. This method of analysis of metals and alloys is:
   1. too ancient to be used today in the laboratory;
   2. useful for pure metals, not so useful for alloys;
   3. useful for both metals and alloys;
   4. a nondestructive method of analysis;
   
   
3. When aluminum is identified:
   1. is identified as Al³⁺ cation;
   2. is identified as Al²⁺ cation;
   3. the presence of other ions may produce a true negative outcome;
   4. using of alizarin along with ammonium hidroxide provide a red colored complex;
   
   
4. The paper requires before analysis of the sample:
   1. to be dry;
   2. to be cut in small pieces;
   3. to be burned;
   4. to be moistened with an electrolyte;
   
   
5. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   3. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd circuitul electric este īnchis:
   1. cationii din solutie sunt trecuti īn proba ca metale;
   2. curent electric trece prin proba si hārtie;
   3. disocierea apei este inhibata;
   4. anionii din solutie sunt trecuti īn proba ca metale;
   5. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   
   
2. Aceasta metoda de analiza de metale si aliaje este:
   1. prea veche pentru a fi utilizata īn prezent īn laborator;
   2. utila pentru metale pure, nu atāt de utila pentru aliaje;
   3. utila atāt pentru metale si aliaje;
   4. o metoda nedistructiva de analiza;
   5. o metoda cantitativa de analiza;
   
   
3. Cānd aluminiu este identificat:
   1. este identificat ca cationul Al³⁺;
   2. este identificat ca cationul Al²⁺;
   3. prezenta altor ioni poate produce un rezultat adevarat negativ;
   4. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un complex colorat rosu;
   5. prezenta altor ioni poate produce un rezultat adevarat pozitiv;
   
   
4. Hartia necesita ca īnainte de analiza probei:
   1. sa fie uscata;
   2. sa fie taiata īn bucati mici;
   3. sa fie arsa;
   4. sa fie umezita cu un electrolit;
   5. sa fie testata;
   
   
5. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   3. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When the electrical circuit is closed:
   1. elements from the metals are passed into solution as anions;
   2. water dissociation is inhibited;
   3. cations from the solution are passed into sample as metals;
   4. elements from the solution are passed into sample as metals;
   
   
2. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   
3. This method of analysis of metals and alloys is:
   1. useful for pure metals, not so useful for alloys;
   2. a nondestructive method of analysis;
   3. a gravimetric method of analysis;
   4. not useful for both metals and alloys;
   
   
4. When lead is identified:
   1. a violet complex appears;
   2. precautions should be made for toxic wastes disposal;
   3. dangerous substances are used;
   4. a red-brown complex appears;
   
   
5. 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. for the paper to work as isolator;
   4. to be cut easily with scissors;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd circuitul electric este īnchis:
   1. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   2. disocierea apei este inhibata;
   3. cationii din solutie sunt trecuti īn proba ca metale;
   4. elemente din solutie sunt trecute īn proba ca metale;
   
   
2. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   5. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   
3. Aceasta metoda de analiza de metale si aliaje este:
   1. utila pentru metale pure, nu atāt de utila pentru aliaje;
   2. o metoda nedistructiva de analiza;
   3. o metoda gravimetrica de analiza;
   4. nu este utila nici pentru metale nici pentru aliaje;
   
   
4. Cānd plumbul este identificat:
   1. apare un complex violet;
   2. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   3. sunt utilizate substante periculoase;
   4. apare un complex rosu-brun;
   5. reactiile utilizate īn mod clar ii indica prezenta;
   
   
5. 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 ca hartia sa actioneze ca izolator;
   4. sa fie taiat cu usurinta cu foarfeca;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The density of the solutions depends on:
   1. pressure;
   2. provider;
   3. time elapsed since were prepared;
   4. quantity;
   
   
2. 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 use our phones;
   
   
3. Titration as a laboratory operation involves:
   1. a sulphuric acid solution;
   2. a mass measurement;
   3. a pH-metter;
   4. a volume measurement;
   
   
4. Reactions between acids and bases:
   1. always have as a consequence the formation of a quantity of water;
   2. are always fast, taking place almost instantaneously;
   3. have as effect the change of the color of a solution;
   4. are rarely useful, and even rarely used;
   
   
5. 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. in large quantities, according to the principle 'only size matters';
   4. only at the suggestion of the supervisor;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Densitatea solutiilor depinde de:
   1. presiune;
   2. furnizor;
   3. timpul scurs de cand au fost pregatite;
   4. cantitate;
   5. temperatura;
   
   
2. 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 utilizam telefoanele;
   5. este necesar a se lua unele informatii de pe sticlele de reactivi;
   
   
3. Titrarea ca o operatiune de laborator implica:
   1. o solutie de acid sulfuric;
   2. masurarea masei;
   3. un pH-metru;
   4. masurarea volumului;
   
   
4. Reactiile īntre acizi si baze:
   1. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   2. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   3. au ca efect schimbarea culorii unei solutii;
   4. sunt rareori utile, si chiar mai rar utilizate;
   5. au drept consecinta dizolvarea unei sari;
   
   
5. 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. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   4. numai la sugestia supraveghetorului;
   5. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The following chemical reactions were used in the experiments:
   1. H₂O + CO₂ -> H₂CO₃
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   
   
2. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the energy;
   2. the liquid in the burette should be at the same level before and after conducting the experiment;
   3. all glassware should be clean before, after and during the experiment;
   4. the principle of the conservation of the number of atoms for each element;
   
   
3. 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. occurs only when we mix wrong substances in the laboratory;
   4. is considered to be the following one: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   
4. The equivalence point is:
   1. used to balance the equation;
   2. something rarely encountered in chemistry;
   3. the point in which a reactive is fully consumed in the reaction;
   4. indicated when a color change is observed into the solution;
   
   
5. In the calculations:
   1. are necessary to use some formulas expressing in different ways the concentration;
   2. are necessary to take the results imediatly after these are available from others;
   3. are necessary to take some information from reagent bottles;
   4. are necessary to draw the tables in our notebooks after completing of the experiment;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. H₂O + CO₂ -> H₂CO₃
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   
   
2. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii energiei;
   2. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   3. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   4. principiul conservarii numarul de atomi pentru fiecare element;
   
   
3. 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. apare numai atunci cānd se amesteca substante gresit īn laborator;
   4. este considerat a fi urmatorul: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   
4. Punctul de echivalenta este:
   1. folosit pentru a echilibra ecuatia;
   2. ceva rar īntālnit īn chimie;
   3. punctul īn care un reactiv este consumat complet īn reactie;
   4. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   5. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   
   
5. In calcule:
   1. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   2. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   3. este necesar a se lua unele informatii de pe sticlele de reactivi;
   4. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   5. este necesar sa utilizam telefoanele;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. Reactions between acids and bases:
   1. are all exothermic, being therefore dangerous outside of the laboratory;
   2. have as effect the change of the color of a solution;
   3. are always fast, taking place almost instantaneously;
   4. are rarely useful, and even rarely used;
   
   
2. A redox process:
   1. is always fast and safe;
   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 changing of the aggregation states of some participants to the reaction;
   
   
3. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the energy;
   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 liquid in the burette should be at the same level before and after conducting the experiment;
   
   
4. The indicator should be added:
   1. in small quantities, to avoid the errors in observations and in calculations;
   2. to provide a color change at equivalence point;
   3. only in special cases, when the burette is graded from its bottom to its top;
   4. only at the suggestion of the supervisor;
   
   
5. The equivalence point is:
   1. used to balance the equation;
   2. the point in which a reactive is fully consumed in the reaction;
   3. something rarely encountered in chemistry;
   4. the point in which a reactive should be added in the burette;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Reactiile īntre acizi si baze:
   1. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   2. au ca efect schimbarea culorii unei solutii;
   3. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   4. sunt rareori utile, si chiar mai rar utilizate;
   5. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   
   
2. Un proces redox:
   1. este īntotdeauna rapid si sigur;
   2. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   4. implica schimbarea a starilor de agregare ale unor participanti la reactie;
   5. este considerat a fi urmatorul: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   
3. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii energiei;
   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. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   
   
4. Trebuie adaugat indicatorul:
   1. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   2. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   3. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   4. numai la sugestia supraveghetorului;
   5. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   
   
5. Punctul de echivalenta este:
   1. folosit pentru a echilibra ecuatia;
   2. punctul īn care un reactiv este consumat complet īn reactie;
   3. ceva rar īntālnit īn chimie;
   4. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   5. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The following chemical reactions were used in the experiments:
   1. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   2. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   4. H₂O + CO₂ -> H₂CO₃
   
   
2. When a chemical reaction is balanced, following should be considered:
   1. all glassware should be clean before, after and during the experiment;
   2. all glassware should be clean before and after conducting the experiment;
   3. the principle of the conservation of the number of atoms for each element;
   4. the principle of the conservation of the energy;
   
   
3. The density of the solutions depends on:
   1. provider;
   2. concentration;
   3. pressure;
   4. temperature;
   
   
4. In the calculations:
   1. are necessary to use some formulas expressing in different ways the concentration;
   2. are necessary to take some information from reagent bottles;
   3. are necessary to draw the tables in our notebooks after completing of the experiment;
   4. are necessary to establish the coefficients of the chemical reaction;
   
   
5. Titration as a laboratory operation involves:
   1. a pH indicator that changes color depending on the pH of the solution;
   2. a volume measurement;
   3. a standard or referential reactive;
   4. a pH-metter;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   2. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   4. H₂O + CO₂ -> H₂CO₃
   5. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   
   
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. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   3. principiul conservarii numarul de atomi pentru fiecare element;
   4. principiul conservarii energiei;
   5. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   
   
3. Densitatea solutiilor depinde de:
   1. furnizor;
   2. concentratie;
   3. presiune;
   4. temperatura;
   
   
4. In calcule:
   1. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   2. este necesar a se lua unele informatii de pe sticlele de reactivi;
   3. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   4. este necesara stabilirea coeficientilor reactiei chimice;
   
   
5. Titrarea ca o operatiune de laborator implica:
   1. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   2. masurarea volumului;
   3. un standard sau reactiv de referinta;
   4. un pH-metru;
   5. o biureta;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. In the calculations:
   1. are necessary to use our phones;
   2. are necessary to use some formulas expressing in different ways the concentration;
   3. are necessary to draw the tables in our notebooks after completing of the experiment;
   4. are necessary to discuss with our colleagues;
   
   
2. Reactions between acids and bases:
   1. always have as a consequence the formation of a quantity of water;
   2. are all exothermic, being therefore dangerous outside of the laboratory;
   3. have as effect the change of the color of a solution;
   4. are rarely useful, and even rarely used;
   
   
3. The following chemical reactions were used in the experiments:
   1. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   2. H₂O + CO₂ -> H₂CO₃
   3. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   4. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   
   
4. The equivalence point is:
   1. the point in which a reactive should be added in the reaction flask;
   2. something rarely encountered in chemistry;
   3. used to balance the equation;
   4. indicated when a color change is observed into the solution;
   
   
5. When a chemical reaction is balanced, following should be considered:
   1. all glassware should be clean before and after conducting the experiment;
   2. the principle of the conservation of the volume;
   3. the principle of the conservation of the energy;
   4. all glassware should be clean before, after and during the experiment;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. In calcule:
   1. este necesar sa utilizam telefoanele;
   2. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   3. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   4. este necesar sa discutam cu colegii;
   
   
2. Reactiile īntre acizi si baze:
   1. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   2. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   3. au ca efect schimbarea culorii unei solutii;
   4. sunt rareori utile, si chiar mai rar utilizate;
   5. au drept consecinta dizolvarea unei sari;
   
   
3. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   2. H₂O + CO₂ -> H₂CO₃
   3. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   4. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   5. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
4. Punctul de echivalenta este:
   1. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   2. ceva rar īntālnit īn chimie;
   3. folosit pentru a echilibra ecuatia;
   4. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   5. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   
   
5. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   2. principiul conservarii volumului;
   3. principiul conservarii energiei;
   4. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   3. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   4. HCl + HO^- -> H₂O + Cl^-
   
   
2. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + Cl⁺ -> NaCl + HO⁺
   2. NaOH + Cl^- -> NaCl + HO^-
   3. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   4. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   
   
3. 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 + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
4. We may say the followings:
   1. natural water may contain organic matter and living organisms;
   2. purification of the water may include chemical processes;
   3. purification of the water may include biological processes;
   4. purification of the water may include labeling processes;
   
   
5. For a water sample following measures may be quantitatively expressed:
   1. total alkalinity;
   2. purity;
   3. mineral acidity;
   4. total acidity;
   
   

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 + HO⁺ -> H₂O + Cl⁺
   2. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   3. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   4. HCl + HO^- -> H₂O+Cl^-
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + Cl⁺ -> NaCl + HO⁺
   2. NaOH + Cl^- -> NaCl + HO^-
   3. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   4. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   5. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   
   
3. 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 + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
4. Putem spune urmatoarele:
   1. apa naturala poate contine materie organica si organisme vii;
   2. purificarea apei poate include procese chimice;
   3. purificarea apei poate include procese biologice;
   4. purificarea apei poate include procesele de etichetare;
   
   
5. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. alcalinitate totala;
   2. puritate;
   3. aciditate minerala;
   4. aciditate totala;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. For a water sample following measures may be quantitatively expressed:
   1. permanent alkalinity;
   2. total alkalinity;
   3. mineral acidity;
   4. total acidity;
   
   
2. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + CO₃^2- -> HCO₃^- + Cl^-
   2. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   3. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   4. HCl + HO^- -> H₂O + Cl^-
   
   
3. In the laboratory the water were:
   1. complexed by using EDTA titrimetric method;
   2. biologically purified using the resin column;
   3. acidified for drinking purposes;
   4. alkalinized for drinking purposes;
   
   
4. EDTA is used:
   1. for safety precautions purposes;
   2. for complexing of Ca²⁺ and Mg²⁺ ions;
   3. for recharging of the resin for water softening;
   4. for indication of the equilibrium point in the reaction;
   
   
5. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + HO^- -> H₂O + Cl^-
   2. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   3. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   4. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. alcalinitate permanenta;
   2. alcalinitate totala;
   3. aciditate minerala;
   4. aciditate totala;
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + CO₃^2- -> HCO₃^- + Cl^-
   2. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   3. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   4. HCl + HO^- -> H₂O+Cl^-
   
   
3. In laborator apa au fost:
   1. complexata prin metoda titrimetrica EDTA;
   2. purificata biologic utilizānd coloana de rasina;
   3. acidulata pentru baut;
   4. alcalinizeaza pentru baut;
   
   
4. EDTA este utilizat:
   1. ca masura de siguranta;
   2. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   3. pentru reīncarcarea rasinii la dedurizarea apei;
   4. pentru indicarea punctului de echilibru īn reactie;
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + HO^- -> H₂O + Cl^-
   2. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   3. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   4. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   

FINAL TEST AT LABORATORY
Water analysis

1. In the laboratory the water were:
   1. hardened using the resin column;
   2. biologically purified using the resin column;
   3. acidified for drinking purposes;
   4. complexed by using EDTA titrimetric method;
   
   
2. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   2. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   3. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
3. 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⁺
   
   
4. In the laboratory were analyzed:
   1. the acidity of the water;
   2. the hardness of the water;
   3. the boiling point of the water;
   4. the color of the water;
   
   
5. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   2. HCl + CO₃^2- -> HCO₃^- + Cl^-
   3. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   4. HCl + HO⁺ -> H₂O + Cl⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. In laborator apa au fost:
   1. calita folosind coloana de rasina;
   2. purificata biologic utilizānd coloana de rasina;
   3. acidulata pentru baut;
   4. complexata prin metoda titrimetrica EDTA;
   5. alcalinizeaza pentru baut;
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   2. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   3. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   5. HCl + HO^- -> H₂O + Cl^-
   
   
3. 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⁺
   5. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   
   
4. Īn laborator au fost analizate:
   1. aciditatea apei;
   2. duritatea apei;
   3. punctul de fierbere al apei;
   4. culoarea apei;
   5. alcalinitatea apei;
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   2. HCl + CO₃^2- -> HCO₃^- + Cl^-
   3. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   4. HCl + HO⁺ -> H₂O + Cl⁺
   5. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   
   

FINAL TEST AT LABORATORY
Water analysis

1. We may say the followings:
   1. purification of the water may include biological processes;
   2. when water contains dissolved minerals and gases is bad for drinking;
   3. water is good for drinking, it is nothing to be analysed;
   4. water is a good polar solvent;
   
   
2. In the laboratory the water were:
   1. complexed by using EDTA titrimetric method;
   2. hardened using the resin column;
   3. biologically purified using the resin column;
   4. softened using the resin column;
   
   
3. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   2. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   3. NaOH + HCOO⁺ -> HCOONa + HO⁺
   4. NaOH + HCOO^- -> HCOONa + HO^-
   
   
4. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   2. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   3. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
5. In the laboratory were analyzed:
   1. the alkalinity of the water;
   2. the boiling point of the water;
   3. the solubility of the water;
   4. the concentration of the water;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Putem spune urmatoarele:
   1. purificarea apei poate include procese biologice;
   2. atunci cānd apa contine minerale dizolvate si gaze este rea pentru baut;
   3. apa este buna pentru consum, nu este nimic de a fi analizat;
   4. apa este un solvent polar bun;
   5. purificarea apei poate include procese chimice;
   
   
2. In laborator apa au fost:
   1. complexata prin metoda titrimetrica EDTA;
   2. calita folosind coloana de rasina;
   3. purificata biologic utilizānd coloana de rasina;
   4. dedurizata folosind coloana de rasina;
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   2. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   3. NaOH + HCOO⁺ -> HCOONa + HO⁺
   4. NaOH + HCOO^- -> HCOONa + HO^-
   5. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   2. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   3. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   5. HCl + HO^- -> H₂O + Cl^-
   
   
5. Īn laborator au fost analizate:
   1. alcalinitatea apei;
   2. punctul de fierbere al apei;
   3. solubilitatea apei;
   4. concentratia apei;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. In the laboratory the water were:
   1. acidified for drinking purposes;
   2. biologically purified using the resin column;
   3. hardened using the resin column;
   4. alkalinized for drinking purposes;
   
   
2. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + CO₃^2- -> HCO₃^- + Cl^-
   4. HCl + HO⁺ -> H₂O + Cl⁺
   
   
3. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   4. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   
   
4. In the laboratory were analyzed:
   1. the solubility of the water;
   2. the boiling point of the water;
   3. the color of the water;
   4. the alkalinity of the water;
   
   
5. EDTA is used:
   1. for safety precautions purposes;
   2. for complexing of Ca²⁺ and Mg²⁺ ions;
   3. as reagent for determining the hardness of the water;
   4. for recharging of the resin for water softening;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. In laborator apa au fost:
   1. acidulata pentru baut;
   2. purificata biologic utilizānd coloana de rasina;
   3. calita folosind coloana de rasina;
   4. alcalinizeaza pentru baut;
   5. dedurizata folosind coloana de rasina;
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   2. HCl + HO^- -> H₂O+Cl^-
   3. HCl + CO₃^2- -> HCO₃^- + Cl^-
   4. HCl + HO⁺ -> H₂O + Cl⁺
   5. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   4. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   
   
4. Īn laborator au fost analizate:
   1. solubilitatea apei;
   2. punctul de fierbere al apei;
   3. culoarea apei;
   4. alcalinitatea apei;
   5. temperatura apei;
   
   
5. EDTA este utilizat:
   1. ca masura de siguranta;
   2. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   3. ca reactiv pentru determinarea duritatii apei;
   4. pentru reīncarcarea rasinii la dedurizarea apei;
   
   

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

1. Which of the following reactions may be called as of corrosion:
   1. ZnO + CO -> Zn + CO₂
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. H⁺ + Ni -> H₂ + Ni²⁺
   
   
2. The aluminum plate:
   1. was corroded in sodium hydroxide solution;
   2. was involved in the gravimetric method of corrosion analysis
   3. was involved in the volumetric method of corrosion analysis
   4. the volume is measured before and after immersing it in NaOH;
   
   
3. In studied corrosion processes:
   1. a gas is released only the corrosion of zinc;
   2. a gas is released at both corrosion of zinc and aluminum;
   3. a gas is released only the corrosion of aluminum;
   4. when a gas is released its volume depends on the amount of metal corroded;
   
   
4. Corrosion of metals:
   1. is the protection in time to chemical agents;
   2. can be reduced by electroplating;
   3. is the destruction of metals under the action of external factors;
   4. is a beneficial process that shows the stability of metals;
   
   
5. The zinc plate:
   1. the mass is measured before and after immersing it in H₂SO₄;
   2. was corroded in sulfuric solution;
   3. was involved in the gravimetric method of corrosion analysis
   4. was degreased in sulfuric acid solution;
   
   

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

1. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. ZnO + CO -> Zn + CO₂
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. H⁺ + Ni -> H₂ + Ni²⁺
   
   
2. Pentru placa de aluminiu:
   1. a fost corodata īn solutie de hidroxid de sodiu;
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. a fost implicata īn metoda volumetrica de analiza a coroziunii
   4. volumul se masoara īnainte si dupa imersia īn NaOH;
   
   
3. Īn procesele de coroziune studiate:
   1. un gaz este eliberat numai la corodarea zincului;
   2. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   3. un gaz este eliberat numai la corodarea aluminiului;
   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 cation;
   
   
4. Coroziunea metalelor:
   1. este protectia de durata impotriva agentilor chimici;
   2. poate fi redusa prin galvanizare;
   3. este distrugerea metalelor sub actiunea factorilor externi;
   4. este un proces benefic care arata stabilitatea metalelor;
   5. poate fi redusa prin pasivare;
   
   
5. Pentru placa de zinc:
   1. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   2. a fost corodata īn solutie sulfuric;
   3. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   4. a fost degresata īn solutie de acid sulfuric;
   5. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   
   

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

1. The aluminum plate:
   1. was involved in the volumetric method of corrosion analysis
   2. was involved in the gravimetric method of corrosion analysis
   3. the 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. the metal it changes its oxidation state becoming an anion;
   2. the metal it changes its oxidation state becoming an cation;
   3. when a gas is released its volume depends on the amount of metal corroded;
   4. a gas is released only the corrosion of zinc;
   
   
3. The zinc plate:
   1. was degreased in sulfuric acid solution;
   2. the volume is measured before and after immersing it in H₂SO₄;
   3. was corroded in sulfuric solution;
   4. the surface is measured before and after immersing it in H₂SO₄;
   
   
4. Which of the following reactions may be called as of corrosion:
   1. ZnO + CO -> Zn + CO₂
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. Fe₂O₃ + CO -> Fe + CO₂
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
5. Corrosion of metals:
   1. can be reduced by passivation;
   2. is helping in the process of cleaning the metals surfaces;
   3. is the destruction of metals under the action of external factors;
   4. is a beneficial process that shows the stability of metals;
   
   

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

1. Pentru placa de aluminiu:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. 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. metalul isi schimba starea de oxidare pentru a deveni un anion;
   2. metalul isi schimba starea de oxidare pentru a deveni un cation;
   3. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   4. un gaz este eliberat numai la corodarea zincului;
   5. īntotdeauna metalul isi schimba starea de oxidare;
   
   
3. Pentru placa de zinc:
   1. a fost degresata īn solutie de acid sulfuric;
   2. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   3. a fost corodata īn solutie sulfuric;
   4. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. ZnO + CO -> Zn + CO₂
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. Fe₂O₃ + CO -> Fe + CO₂
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   5. H⁺ + Ni -> H₂ + Ni²⁺
   
   
5. Coroziunea metalelor:
   1. poate fi redusa prin pasivare;
   2. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   3. este distrugerea metalelor sub actiunea factorilor externi;
   4. este un proces benefic care arata stabilitatea metalelor;
   
   

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

1. Which of the following reactions may be called as of corrosion:
   1. H⁺ + Ni -> H₂ + Ni²⁺
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   
   
2. The zinc plate:
   1. was involved in the gravimetric method of corrosion analysis
   2. the mass is measured before and after immersing it in H₂SO₄;
   3. was degreased in sulfuric acid solution;
   4. the volume is measured before and after immersing it in H₂SO₄;
   
   
3. Corrosion of metals:
   1. is a beneficial process that shows the stability of metals;
   2. may provide useful raw materials for analysis;
   3. is the protection in time to chemical agents;
   4. can be reduced by electroplating;
   
   
4. In studied corrosion processes:
   1. always the metal changes its oxidation state;
   2. a gas is released only the corrosion of aluminum;
   3. a gas is released at both corrosion of zinc and aluminum;
   4. the metal it changes its oxidation state becoming an cation;
   
   
5. The aluminum plate:
   1. was degreased in sodium hydroxide solution;
   2. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   3. the volume is measured before and after immersing it in NaOH;
   4. the mass is measured before and after immersing it in NaOH;
   
   

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

1. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H⁺ + Ni -> H₂ + Ni²⁺
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   
   
2. Pentru placa de zinc:
   1. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   2. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   3. a fost degresata īn solutie de acid sulfuric;
   4. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   
   
3. Coroziunea metalelor:
   1. este un proces benefic care arata stabilitatea metalelor;
   2. poate furniza materii prime utile pentru analiza;
   3. este protectia de durata impotriva agentilor chimici;
   4. poate fi redusa prin galvanizare;
   5. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   
   
4. Īn procesele de coroziune studiate:
   1. īntotdeauna metalul isi schimba starea de oxidare;
   2. un gaz este eliberat numai la corodarea aluminiului;
   3. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   4. metalul isi schimba starea de oxidare pentru a deveni un cation;
   5. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   
   
5. Pentru placa de aluminiu:
   1. a fost degresata īn solutie de hidroxid de sodiu;
   2. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   3. volumul se masoara īnainte si dupa imersia īn NaOH;
   4. masa este masurata īnainte si dupa imersia īn NaOH;
   
   

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

1. The aluminum plate:
   1. the surface is measured before and after immersing it in NaOH;
   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 volume is measured before and after immersing it in NaOH;
   
   
2. Corrosion of metals:
   1. can be reduced by passivation;
   2. is a beneficial process that shows the stability of metals;
   3. can be reduced by electroplating;
   4. is the destruction of metals under the action of external factors;
   
   
3. In studied corrosion processes:
   1. a gas is released at both corrosion of zinc and aluminum;
   2. when a gas is released its volume depends on the amount of metal corroded;
   3. the metal it changes its oxidation state becoming an anion;
   4. always the metal changes its oxidation state;
   
   
4. The zinc plate:
   1. was degreased in sulfuric acid solution;
   2. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   3. the surface is measured before and after immersing it in H₂SO₄;
   4. was corroded in sulfuric solution;
   
   
5. Which of the following reactions may be called as of corrosion:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. H⁺ + Ni -> H₂ + Ni²⁺
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   

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

1. Pentru placa de aluminiu:
   1. suprafata se masoara īnainte si dupa imersia īn NaOH;
   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. volumul se masoara īnainte si dupa imersia īn NaOH;
   5. a fost corodata īn solutie de hidroxid de sodiu;
   
   
2. Coroziunea metalelor:
   1. poate fi redusa prin pasivare;
   2. este un proces benefic care arata stabilitatea metalelor;
   3. poate fi redusa prin galvanizare;
   4. este distrugerea metalelor sub actiunea factorilor externi;
   
   
3. Īn procesele de coroziune studiate:
   1. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   2. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   3. metalul isi schimba starea de oxidare pentru a deveni un anion;
   4. īntotdeauna metalul isi schimba starea de oxidare;
   
   
4. Pentru placa de zinc:
   1. a fost degresata īn solutie de acid sulfuric;
   2. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   3. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   4. a fost corodata īn solutie sulfuric;
   
   
5. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. H⁺ + Ni -> H₂ + Ni²⁺
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   

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

1. Corrosion of metals:
   1. takes place merely from exposure to moisture in air;
   2. is helping in the process of cleaning the metals surfaces;
   3. is a beneficial process that shows the stability of metals;
   4. can be reduced by passivation;
   
   
2. The zinc plate:
   1. was involved in the gravimetric method of corrosion analysis
   2. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   3. was corroded in sulfuric solution;
   4. was degreased in sulfuric acid solution;
   
   
3. Which of the following reactions may be called as of corrosion:
   1. Ni(CO)₄ -> Ni + CO
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. Fe₂O₃ + CO -> Fe + CO₂
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
4. 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. a gas is released only the corrosion of zinc;
   4. when a gas is released its volume depends on the amount of metal corroded;
   
   
5. The aluminum plate:
   1. was involved in the gravimetric method of corrosion analysis
   2. the mass is measured before and after immersing it in NaOH;
   3. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   4. the surface is measured before and after immersing it in NaOH;
   
   

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

1. Coroziunea metalelor:
   1. are loc pur si simplu prin expunerea la umiditate īn aer;
   2. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   3. este un proces benefic care arata stabilitatea metalelor;
   4. poate fi redusa prin pasivare;
   
   
2. Pentru placa de zinc:
   1. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   2. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   3. a fost corodata īn solutie sulfuric;
   4. a fost degresata īn solutie de acid sulfuric;
   5. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   
   
3. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Ni(CO)₄ -> Ni + CO
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. Fe₂O₃ + CO -> Fe + CO₂
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
4. 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. un gaz este eliberat numai la corodarea zincului;
   4. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   5. īntotdeauna metalul isi schimba starea de oxidare;
   
   
5. Pentru placa de aluminiu:
   1. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   2. masa este masurata īnainte si dupa imersia īn NaOH;
   3. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   4. suprafata se masoara īnainte si dupa imersia īn NaOH;
   5. a fost degresata īn solutie de hidroxid de sodiu;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. It is expected to have a mass of nickel deposited:
   1. proportional with the nickel plating time;
   2. much lower than the calculated theoretical one;
   3. inversely proportional with the surface of the sample;
   4. much higher than the calculated theoretical one;
   
   
2. At the nickel plating following reactions took place:
   1. at anode (+), connected with nickel piece, Ni²⁺ + 2e^- -> Ni⁰
   2. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the cathode: O^2- - 2e^- -> O₂⁰
   3. at cathode (-), connected with metallic piece, Ni⁰ - 2e^- -> Ni²⁺
   4. at anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   
   
3. 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. the electrolysis law;
   
   
4. The intensity of the current:
   1. should be adjusted by the technicians, we have nothing to do there;
   2. affect only the quantity of the nickel deposition;
   3. affect only the quality of the nickel deposition;
   4. does not affect the quality nor the quantity of the nickel deposition;
   
   
5. Electrical conductivity of nickel salts solutions:
   1. is relatively small;
   2. is reduced by salts additions;
   3. is improved by salts additions;
   4. is relatively high;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

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 quantity of the nickel deposition;
   3. is to be calculated before to start the experiment;
   4. does not affect the quality nor the quantity of the nickel deposition;
   
   
2. Electrical conductivity of nickel salts solutions:
   1. is reduced by salts additions;
   2. is relatively small;
   3. is relatively high;
   4. depends on the intensity of the current used;
   
   
3. 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 anode: O^2- - 2e^- -> O₂⁰
   4. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the cathode: O^2- - 2e^- -> O₂⁰
   
   
4. Theoretical mass of nickel deposited is calculated using:
   1. perfect gas law;
   2. law of mass action;
   3. the conservation of the energy law;
   4. the electrolysis law;
   
   
5. It is expected to have a mass of nickel deposited:
   1. proportional with the surface of the sample;
   2. proportional with the intensity of the current used;
   3. much lower than the calculated theoretical one;
   4. proportional with the nickel plating time;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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