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

1. The chronometer is used in the experiment for:
   1. to keep us busy;
   2. measuring of the diffusion time;
   3. indication of the moment when we should pay attention to the experiment;
   4. extracting the information necessary to calculate the diffusion coefficients;
   
   
2. The time to the formation of the ring in the experiment is dependent on:
   1. the virtual speeds and not the real speeds of each involved species;
   2. the width of the tube and not of the length of the tube;
   3. the propagation of the species as neutral molecules and not as ions;
   4. the length of the tube and not of the width of the tube;
   
   
3. At the ends of the tube following equilibrium reactions occurs:
   1. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. H⁺ + HO^- \=\ H₂O
   4. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
4. We may say the followings:
   1. the kinetic energy of a molecule is affected by temperature only;
   2. the molecules have energy in all gaseous, liquid and solid states;
   3. diffusion process appears only in gaseous and liquid states;
   4. diffusion process appears in all gaseous, liquid and solid states;
   
   
5. The position of the ring in the experiment is dependent on:
   1. the propagation of the species as ions and not as neutral molecules;
   2. the length of the tube and not of the width of the tube;
   3. the speed of diffusion of each involved species;
   4. the virtual speeds and not the real speeds of each involved species;
   
   

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

1. Cronometrul este utilizat īn experimentul pentru:
   1. sa ne tina ocupati;
   2. masurarea timpului de difuzie;
   3. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   4. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   
   
2. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   2. latimea tubului si nu lungimea tubului;
   3. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   4. lungimea tubului si nu latimea tubului;
   
   
3. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. H⁺ + HO^- \=\ H₂O
   4. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
4. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. energia cinetica a unei molecule este afectata de numai temperatura;
   2. moleculele au energie īn toate starile gazoasa, lichida si solida;
   3. proces de difuzie apare numai īn stare gazoasa si lichida;
   4. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   5. moleculele au viteze numai īn stare gazoasa;
   
   
5. Pozitia inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca ionii si nu ca si molecule neutre;
   2. lungimea tubului si nu latimea tubului;
   3. viteza de difuzie a fiecarei specii implicate;
   4. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   
   

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. to keep us busy;
   4. extracting the information necessary to calculate the speeds ratio;
   
   
2. We may say the followings:
   1. the kinetic energy of a molecule is affected by temperature and pressure;
   2. the kinetic energy of a molecule is affected by temperature only;
   3. the molecules have energy in all gaseous, liquid and solid states;
   4. the molecules have speeds only in gaseous state;
   
   
3. At the ends of the tube following equilibrium reactions occurs:
   1. H₂O \=\ H⁺ + HO^-
   2. H⁺ + HO^- \=\ H₂O
   3. NH₄⁺ + Cl^- \=\ NH₄Cl
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   
4. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all have same speed;
   2. are considered to be at the same temperature, but may have different energies;
   3. all have same energy;
   4. are considered to be at the same temperature, but may have different speeds;
   
   
5. The position of the ring in the experiment is dependent on:
   1. the length of the tube and the width of the tube;
   2. the concentrations of the solutions used;
   3. the propagation of the species as neutral molecules and not as ions;
   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. Cronometrul este utilizat īn experimentul pentru:
   1. sincronizarea timpilor de difuzie;
   2. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   3. sa ne tina ocupati;
   4. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   
   
2. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. energia cinetica a unei molecule este afectata de temperatura si presiune;
   2. energia cinetica a unei molecule este afectata de numai temperatura;
   3. moleculele au energie īn toate starile gazoasa, lichida si solida;
   4. moleculele au viteze numai īn stare gazoasa;
   
   
3. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H₂O \=\ H⁺ + HO^-
   2. H⁺ + HO^- \=\ H₂O
   3. NH₄⁺ + Cl^- \=\ NH₄Cl
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   
4. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate au aceeasi viteza;
   2. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   3. toate au aceeasi energie;
   4. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   5. toate se deplaseaza īn aceeasi directie;
   
   
5. Pozitia inelului īn experimentul este dependenta de:
   1. lungimea tubului si latimea tubului;
   2. concentratiile solutiilor utilizate;
   3. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   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. are considered to be at the same temperature, but may have different speeds;
   2. all have same speed;
   3. all are moving in the same direction;
   4. all have same energy;
   
   
2. The time to the formation of the ring in the experiment is dependent on:
   1. the mode energy or mode speed of each involved species;
   2. the speed of diffusion of each involved species;
   3. the length of the tube and the width of the tube;
   4. the length of the tube and not of the width of the tube;
   
   
3. We may say the followings:
   1. the kinetic energy of a molecule is affected by temperature only;
   2. diffusion process appears in all gaseous, liquid and solid states;
   3. the molecules have speeds only in gaseous and liquid states;
   4. the kinetic energy of a molecule is affected by temperature, pressure and size of the molecule;
   
   
4. At the ends of the tube following equilibrium reactions occurs:
   1. NH₃ + HCl \=\ NH₄Cl
   2. H₂O \=\ H⁺ + HO^-
   3. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   4. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
5. The fog observed during the experiment is due to:
   1. our experiment designed to trap the product of the reaction;
   2. presence of the chlorine;
   3. presence of the ammonia;
   4. formation of ammonium chloride;
   
   

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

1. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   2. toate au aceeasi viteza;
   3. toate se deplaseaza īn aceeasi directie;
   4. toate au aceeasi energie;
   
   
2. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. viteza la moda sau energia la moda a fiecarei specii implicate;
   2. viteza de difuzie a fiecarei specii implicate;
   3. lungimea tubului si latimea tubului;
   4. lungimea tubului si nu latimea tubului;
   
   
3. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. energia cinetica a unei molecule este afectata de numai temperatura;
   2. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   3. moleculele au viteze numai īn stare gazoasa si lichida;
   4. energia cinetica a unei molecule este afectata de temperatura, presiune si dimensiunea moleculei;
   
   
4. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₃ + HCl \=\ NH₄Cl
   2. H₂O \=\ H⁺ + HO^-
   3. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   4. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
5. Ceata observata īn timpul experimentului se datoreaza:
   1. experimentului nostru proiectat pentru a captura produsul de reactie;
   2. prezentei clorului;
   3. prezentei amoniacului;
   4. formarea clorurii de amoniu;
   5. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   
   

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

1. At the ends of the tube following equilibrium reactions occurs:
   1. H₂O \=\ H⁺ + HO^-
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. NH₃ + HCl \=\ NH₄Cl
   4. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   
   
2. The fog observed during the experiment is due to:
   1. unproper illumination in the laboratory and our breathing;
   2. unproper illumination in the laboratory or our breathing;
   3. formation of ammonium chloride;
   4. presence of the ammonia;
   
   
3. We may say the followings:
   1. the molecules have energy only in gaseous and liquid states;
   2. the molecules have speeds only in gaseous state;
   3. diffusion process appears only in gaseous and liquid states;
   4. the kinetic energy of a molecule is affected by temperature and pressure;
   
   
4. The position of the ring in the experiment is dependent on:
   1. the propagation of the species as ions and not as neutral molecules;
   2. the concentrations of the solutions used;
   3. the virtual speeds and not the real speeds of each involved species;
   4. the propagation of the species as neutral molecules and not as ions;
   
   
5. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all have same speed;
   2. all have same energy;
   3. all are moving in an arbitrary direction;
   4. are considered to be at the same temperature, but may have different speeds;
   
   

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

1. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H₂O \=\ H⁺ + HO^-
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. NH₃ + HCl \=\ NH₄Cl
   4. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   
   
2. Ceata observata īn timpul experimentului se datoreaza:
   1. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   2. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   3. formarea clorurii de amoniu;
   4. prezentei amoniacului;
   
   
3. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. moleculele au energie numai īn stare gazoasa si lichida;
   2. moleculele au viteze numai īn stare gazoasa;
   3. proces de difuzie apare numai īn stare gazoasa si lichida;
   4. energia cinetica a unei molecule este afectata de temperatura si presiune;
   
   
4. Pozitia inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca ionii si nu ca si molecule neutre;
   2. concentratiile solutiilor utilizate;
   3. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   4. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   5. lungimea tubului si latimea tubului;
   
   
5. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate au aceeasi viteza;
   2. toate au aceeasi energie;
   3. toate se īndreapta īntr-o directie arbitrara;
   4. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   
   

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

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

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

1. Cronometrul este utilizat īn experimentul pentru:
   1. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   2. masurarea timpului de difuzie;
   3. sa ne tina ocupati;
   4. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   5. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   
   
2. Pozitia inelului īn experimentul este dependenta de:
   1. energia medie sau viteza medie a fiecarei specii implicate;
   2. lungimea tubului si nu latimea tubului;
   3. propagarea speciilor ca ionii si nu ca si molecule neutre;
   4. latimea tubului si nu lungimea tubului;
   
   
3. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. moleculele au energie īn toate starile gazoasa, lichida si solida;
   2. moleculele au energie numai īn stare gazoasa si lichida;
   3. energia cinetica a unei molecule este afectata de temperatura, presiune si dimensiunea moleculei;
   4. moleculele au energie numai īn stare gazoasa;
   5. moleculele au viteze numai īn stare gazoasa;
   
   
4. Ceata observata īn timpul experimentului se datoreaza:
   1. prezentei amoniacului;
   2. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   3. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   4. prezentei clorului;
   
   
5. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H⁺ + HO^- \=\ H₂O
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. H₂O \=\ H⁺ + HO^-
   4. NH₃ + HCl \=\ NH₄Cl
   5. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   
   

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. opening a bubble water bottle;
   3. Ag₂O -> Ag + O₂;
   4. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   
   
2. For gaseous state:
   1. the pressure is unchanged when a chemical reaction occurs;
   2. the pressure is subject to change when a chemical reaction occurs;
   3. the pressure is approximately the same as in liquid state;
   4. we need to take supplementary precautions in the laboratory;
   
   
3. In the laboratory were studied:
   1. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   2. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   3. increasing of the temperature of a solid mass when was heated;
   4. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   
   
4. The values taken from the experiment conducted in the laboratory indicated that:
   1. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   2. the ideal model of a gas approximated the best the behavior of the released gas;
   3. the ideal model of a gas approximated the worst the behavior of the released gas;
   4. we possess enough information to decide what gas was released from the reaction;
   
   
5. 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 derived to approximate the relation between state parameters;
   4. a relation which may involve some constants dependent of gas composition;
   
   

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. deschiderea unei sticle de apa cu bule;
   3. Ag₂O -> Ag + O₂;
   4. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   5. KCl + O₂ -> KClO₃;
   
   
2. Pentru stare gazoasa:
   1. presiunea este neschimbata cānd apare o reactie chimica;
   2. presiunea se pot modifica atunci cānd apare o reactie chimica;
   3. presiunea este aproximativ aceeasi ca si īn stare lichida;
   4. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   
   
3. Īn laborator s-au studiat:
   1. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   2. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   3. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   4. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   5. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   
   
4. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   2. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   3. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   4. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   
5. 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 derivata pentru a aproxima relatia dintre parametrii de stare;
   4. o relatie care poate implica unele constante dependente de compozitia gazului;
   5. o relatie īntre un numar nelimitat de parametri de stare;
   
   

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

1. The values taken from the experiment conducted in the laboratory indicated that:
   1. ozone were released as result of the decomposition;
   2. we possess enough information to decide what gas was released from the reaction;
   3. oxigen were released as result of the decomposition;
   4. the ideal model of a gas approximated the best the behavior of the released gas;
   
   
2. For gaseous state:
   1. we need to take supplementary precautions in the laboratory;
   2. the pressure depends on the model which are used to approximate it;
   3. the pressure is subject to change when a chemical reaction occurs;
   4. the pressure is unchanged when a chemical reaction occurs;
   
   
3. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   2. KCl + O₂ -> KClO₃;
   3. Ag + O₂ -> Ag₂O;
   4. KNO₃ -> KNO₂ + O₂;
   
   
4. In the laboratory were studied:
   1. increasing of the temperature of a solid mass when was heated;
   2. increasing of the pressure of a gas when was heated;
   3. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   4. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   
   
5. A state equation for a real gas is:
   1. a relation which takes into account certain deviations from the ideal model;
   2. usable in the laboratory, but is not to be used somewhere else;
   3. a relation obtained after conducting of the experiment;
   4. a relation which may involve some constants dependent of gas composition;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

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

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

1. For gaseous state:
   1. the pressure is much higher than in liquid state;
   2. the pressure is approximately the same as in liquid state;
   3. we need to take supplementary precautions in the laboratory;
   4. the pressure depends on the model which are used to approximate it;
   
   
2. The values taken from the experiment conducted in the laboratory indicated that:
   1. the ideal model of a gas approximated the best the behavior of the released gas;
   2. we possess enough information to decide what gas was released from the reaction;
   3. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   4. as more simple 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. Ag + O₂ -> Ag₂O;
   2. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   3. KClO₃ -> KCl + O₂;
   4. distillation of the liquid air;
   
   
4. A state equation for a real gas is:
   1. a relation derived to approximate the relation between state parameters;
   2. a relation obtained after conducting of the experiment;
   3. a relation which is always true, independent of the values of the state parameters;
   4. a relation which takes into account certain deviations from the ideal model;
   
   
5. In the laboratory were studied:
   1. the producing of some gas as result of a lost of the mass of a solid;
   2. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   3. increasing of the temperature of a solid mass when was heated;
   4. increasing of the pressure of a gas when was heated;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pentru stare gazoasa:
   1. presiunea este mult mai mare decāt īn stare lichida;
   2. presiunea este aproximativ aceeasi ca si īn stare lichida;
   3. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   4. presiunea depinde de modelul care este utilizat pentru o aproxima;
   5. presiunea se pot modifica atunci cānd apare o reactie chimica;
   
   
2. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   2. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   3. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   4. cu cat mai simplu 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. Ag + O₂ -> Ag₂O;
   2. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   3. KClO₃ -> KCl + O₂;
   4. distilarea aerului lichid;
   5. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   
   
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 obtinut dupa efectuarea experimentului;
   3. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   4. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   
   
5. Īn laborator s-au studiat:
   1. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   2. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   3. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   4. cresterea presiunii unui gaz cānd s-a īncalzit;
   5. pierdut din masa de solid ca urmare a producerii unor gaze;
   
   

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

1. 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 obtained after conducting of the experiment;
   4. a relation which may involve some constants dependent of gas composition;
   
   
2. In the laboratory were studied:
   1. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   2. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   3. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   4. the producing of some gas as result of a lost of the mass of a solid;
   
   
3. The values taken from the experiment conducted in the laboratory indicated that:
   1. we possess enough information to decide what gas was released from the reaction;
   2. oxigen were released as result of the decomposition;
   3. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   4. air were released as result of the decomposition;
   
   
4. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KNO₃ -> KNO₂ + O₂;
   2. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   3. opening a bubble water bottle;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   
5. For gaseous state:
   1. the pressure is much lower than in liquid state;
   2. the pressure is exactly the same as 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;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. 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 obtinut dupa efectuarea experimentului;
   4. o relatie care poate implica unele constante dependente de compozitia gazului;
   5. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   
   
2. Īn laborator s-au studiat:
   1. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   2. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   3. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   4. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   
   
3. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   2. oxigenul au fost eliberat ca urmare a descompunerii;
   3. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   4. aer a fost eliberat ca urmare a descompunerii;
   5. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   
   
4. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KNO₃ -> KNO₂ + O₂;
   2. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   3. deschiderea unei sticle de apa cu bule;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   5. distilarea aerului lichid;
   
   
5. Pentru stare gazoasa:
   1. presiunea este mult mai mica decāt īn stare lichida;
   2. presiunea este exact la fel ca si 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;
   
   

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

1. In the laboratory were studied:
   1. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   2. the lost of the mass of a solid as result of producing of some gas;
   3. increasing of the pressure of a gas when was heated;
   4. increasing of the temperature of a solid mass when was heated;
   
   
2. A state equation for a real gas is:
   1. usable in the laboratory, but is not to be used somewhere else;
   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 which is always true, independent of the values of the state parameters;
   
   
3. For gaseous state:
   1. the pressure is approximately the same as in liquid state;
   2. the pressure is much lower than in liquid state;
   3. the pressure is much higher than in liquid state;
   4. the pressure is subject to change when a chemical reaction occurs;
   
   
4. The values taken from the experiment conducted in the laboratory indicated that:
   1. oxigen were released as result of the decomposition;
   2. we do not possess enough information to decide what gas was released from the reaction;
   3. the ideal model of a gas approximated the worst the behavior of the released gas;
   4. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   
   
5. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KNO₂ + O₂ -> KNO₃;
   2. distillation of the liquid air;
   3. Ag + O₂ -> Ag₂O;
   4. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Īn laborator s-au studiat:
   1. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   2. pierdut din masa de solid ca urmare a producerii unor gaze;
   3. cresterea presiunii unui gaz cānd s-a īncalzit;
   4. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   
   
2. 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 care poate implica unele constante dependente de compozitia gazului;
   3. o relatie īntre un numar nelimitat de parametri de stare;
   4. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   
   
3. Pentru stare gazoasa:
   1. presiunea este aproximativ aceeasi ca si īn stare lichida;
   2. presiunea este mult mai mica decāt īn stare lichida;
   3. presiunea este mult mai mare decāt īn stare lichida;
   4. presiunea se pot modifica atunci cānd apare o reactie chimica;
   
   
4. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. oxigenul au fost eliberat ca urmare a descompunerii;
   2. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   3. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   4. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   
   
5. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KNO₂ + O₂ -> KNO₃;
   2. distilarea aerului lichid;
   3. Ag + O₂ -> Ag₂O;
   4. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   5. deschiderea unei sticle de apa cu bule;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When the electrical circuit is closed:
   1. surface of the sample is fastly covered by a protecting shield of electrons;
   2. electric current avoids the sample and the paper;
   3. cations from the solution are passed into sample as metals;
   4. elements from the metals are passed into solution as anions;
   
   
2. When lead is identified:
   1. dangerous substances are used;
   2. a yellow complex appears;
   3. the reactions used clearly indicates its presence;
   4. precautions should be made for toxic wastes disposal;
   
   
3. This method of analysis of metals and alloys is:
   1. useful for pure metals, not so useful for alloys;
   2. too ancient to be used today in the laboratory;
   3. useful for alloys, not so useful for metals;
   4. not useful for both metals and alloys;
   
   
4. The paper requires before analysis of the sample:
   1. to be tested;
   2. to be acidified;
   3. to be burned;
   4. to be cut in small pieces;
   
   
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. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd circuitul electric este īnchis:
   1. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   2. curent electric evita proba si hārtia;
   3. cationii din solutie sunt trecuti īn proba ca metale;
   4. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   5. anionii din solutie sunt trecuti īn proba ca metale;
   
   
2. Cānd plumbul este identificat:
   1. sunt utilizate substante periculoase;
   2. apare un complex galben;
   3. reactiile utilizate īn mod clar ii indica prezenta;
   4. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   5. apare un complex albastru;
   
   
3. Aceasta metoda de analiza de metale si aliaje este:
   1. utila pentru metale pure, nu atāt de utila pentru aliaje;
   2. prea veche pentru a fi utilizata īn prezent īn laborator;
   3. utila pentru aliaje, nu atāt de utila pentru metale;
   4. nu este utila nici pentru metale nici pentru aliaje;
   5. o metoda distructiva de analiza;
   
   
4. Hartia necesita ca īnainte de analiza probei:
   1. sa fie testata;
   2. sa fie acidulata;
   3. sa fie arsa;
   4. sa fie taiata īn bucati mici;
   5. sa i se masoare suprafata;
   
   
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. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   5. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. The paper requires before analysis of the sample:
   1. to measure its surface;
   2. to be moistened with an electrolyte;
   3. to be acidified;
   4. to be cut in small pieces;
   
   
2. When lead is identified:
   1. a yellow complex appears;
   2. the reactions used clearly indicates its presence;
   3. interference of other ions may affect the outcome;
   4. a violet complex appears;
   
   
3. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   2. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   
   
4. When aluminum is identified:
   1. is identified as Al¹⁺ cation;
   2. only one identification reaction is possible;
   3. there are many identification reactions possible;
   4. the presence of other ions may produce a true negative outcome;
   
   
5. Why moisten the paper with solution of sodium nitrate?
   1. for stopping after a while the chemical reaction that takes place;
   2. to accomodate ourselves to use chemicals;
   3. to provide cations for analysis;
   4. to have something to do in the laboratory;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Hartia necesita ca īnainte de analiza probei:
   1. sa i se masoare suprafata;
   2. sa fie umezita cu un electrolit;
   3. sa fie acidulata;
   4. sa fie taiata īn bucati mici;
   
   
2. Cānd plumbul este identificat:
   1. apare un complex galben;
   2. reactiile utilizate īn mod clar ii indica prezenta;
   3. interferenta altor ioni poate afecta rezultatul;
   4. apare un complex violet;
   
   
3. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   2. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   
   
4. Cānd aluminiu este identificat:
   1. este identificat ca cationul Al¹⁺;
   2. doar o reactie de identificare este posibila;
   3. exista multe reactii posibile de identificare;
   4. prezenta altor ioni poate produce un rezultat adevarat negativ;
   5. este identificat ca cationul Al³⁺;
   
   
5. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru oprirea dupa un timp reactiei chimice care are loc;
   2. sa ne acomodam in a utiliza substante chimice;
   3. pentru furniza cationi pentru analiza;
   4. pentru a avea ceva de a face īn laborator;
   5. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When aluminum is identified:
   1. only one identification reaction is possible;
   2. the presence of other ions may produce a true negative outcome;
   3. the presence of other ions may produce a false negative outcome;
   4. is identified as Al³⁺ cation;
   
   
2. The electric charges after passing the metals into solution may be:
   1. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   4. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   
3. The paper requires before analysis of the sample:
   1. to be moistened with an electrolyte;
   2. to be weighted;
   3. to be acidified;
   4. to be burned;
   
   
4. When lead is identified:
   1. dangerous substances are used;
   2. precautions should be made for toxic wastes disposal;
   3. a blue complex appears;
   4. a yellow complex appears;
   
   
5. Why moisten the paper with solution of sodium nitrate?
   1. to have something to do in the laboratory;
   2. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   3. to accomodate ourselves to use chemicals;
   4. for stopping after a while the chemical reaction that takes place;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd aluminiu este identificat:
   1. doar o reactie de identificare este posibila;
   2. prezenta altor ioni poate produce un rezultat adevarat negativ;
   3. prezenta altor ioni poate produce un rezultat fals negativ;
   4. este identificat ca cationul Al³⁺;
   5. ar trebui sa fie luate masuri de precautie suplimentare deoarece talerele sunt realizate din aluminiu deasemenea;
   
   
2. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   4. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   5. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   
   
3. Hartia necesita ca īnainte de analiza probei:
   1. sa fie umezita cu un electrolit;
   2. sa fie cantarita;
   3. sa fie acidulata;
   4. sa fie arsa;
   
   
4. Cānd plumbul este identificat:
   1. sunt utilizate substante periculoase;
   2. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   3. apare un complex albastru;
   4. apare un complex galben;
   
   
5. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru a avea ceva de a face īn laborator;
   2. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   3. sa ne acomodam in a utiliza substante chimice;
   4. pentru oprirea dupa un timp reactiei chimice care are loc;
   5. pentru furniza cationi pentru analiza;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. The paper requires before analysis of the sample:
   1. to be dry;
   2. to be acidified;
   3. to be moistened with an electrolyte;
   4. to be burned;
   
   
2. When lead is identified:
   1. a heat release is observed;
   2. a blue complex appears;
   3. the reactions used clearly indicates its presence;
   4. dangerous substances are used;
   
   
3. Why moisten the paper with solution of sodium nitrate?
   1. to be cut easily with scissors;
   2. for stopping after a while the chemical reaction that takes place;
   3. to have something to do in the laboratory;
   4. to provide cations for analysis;
   
   
4. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   4. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   
   
5. When the electrical circuit is closed:
   1. elements from the solution are passed into sample as metals;
   2. surface of the sample is fastly covered by a protecting shield of electrons;
   3. electric current avoids the sample and the paper;
   4. elements from the metals are passed into solution as cations;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Hartia necesita ca īnainte de analiza probei:
   1. sa fie uscata;
   2. sa fie acidulata;
   3. sa fie umezita cu un electrolit;
   4. sa fie arsa;
   5. sa fie testata;
   
   
2. Cānd plumbul este identificat:
   1. se observa o eliberare de caldura;
   2. apare un complex albastru;
   3. reactiile utilizate īn mod clar ii indica prezenta;
   4. sunt utilizate substante periculoase;
   
   
3. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. sa fie taiat cu usurinta cu foarfeca;
   2. pentru oprirea dupa un timp reactiei chimice care are loc;
   3. pentru a avea ceva de a face īn laborator;
   4. pentru furniza cationi pentru analiza;
   5. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   
   
4. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   4. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   5. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   
   
5. Cānd circuitul electric este īnchis:
   1. elemente din solutie sunt trecute īn proba ca metale;
   2. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   3. curent electric evita proba si hārtia;
   4. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. Why moisten the paper with solution of sodium nitrate?
   1. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   2. to be cut easily with scissors;
   3. to provide cations for analysis;
   4. for the paper to work as isolator;
   
   
2. When aluminum is identified:
   1. only one identification reaction is possible;
   2. is identified as Al²⁺ cation;
   3. using of alizarin along with ammonium hidroxide provide a more selective indication about the presence of aluminum;
   4. using of ammonium hidroxide is enough in order to have a clear guess about the presence of aluminum;
   
   
3. When lead is identified:
   1. a red-brown complex appears;
   2. a heat release is observed;
   3. the reactions used clearly indicates its presence;
   4. a violet complex appears;
   
   
4. The paper requires before analysis of the sample:
   1. to measure its surface;
   2. to be cut in small pieces;
   3. to be weighted;
   4. to be moistened with an electrolyte;
   
   
5. This method of analysis of metals and alloys is:
   1. a destructive method of analysis;
   2. a gravimetric method of analysis;
   3. a quantitative method of analysis;
   4. a nondestructive method of analysis;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   2. sa fie taiat cu usurinta cu foarfeca;
   3. pentru furniza cationi pentru analiza;
   4. pentru ca hartia sa actioneze ca izolator;
   5. pentru oprirea dupa un timp reactiei chimice care are loc;
   
   
2. Cānd aluminiu este identificat:
   1. doar o reactie de identificare este posibila;
   2. este identificat ca cationul Al²⁺;
   3. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un indiciu mai selectiv cu privire la prezenta aluminiului;
   4. folosirea hidroxidului de amoniu este suficient pentru a avea indicii clare cu privire la prezenta aluminiului;
   
   
3. Cānd plumbul este identificat:
   1. apare un complex rosu-brun;
   2. se observa o eliberare de caldura;
   3. reactiile utilizate īn mod clar ii indica prezenta;
   4. apare un complex violet;
   5. sunt utilizate substante periculoase;
   
   
4. Hartia necesita ca īnainte de analiza probei:
   1. sa i se masoare suprafata;
   2. sa fie taiata īn bucati mici;
   3. sa fie cantarita;
   4. sa fie umezita cu un electrolit;
   
   
5. Aceasta metoda de analiza de metale si aliaje este:
   1. o metoda distructiva de analiza;
   2. o metoda gravimetrica de analiza;
   3. o metoda cantitativa de analiza;
   4. o metoda nedistructiva de analiza;
   5. utila pentru aliaje, nu atāt de utila pentru metale;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The following chemical reactions were used in the experiments:
   1. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. H₂O + CO₂ -> H₂CO₃
   4. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   
   
2. The density of the solutions depends on:
   1. pressure;
   2. concentration;
   3. temperature;
   4. provider;
   
   
3. A redox process:
   1. involves changing of the aggregation states of some participants to the reaction;
   2. occurs only when we mix wrong substances in the laboratory;
   3. involves a transfer of electrons from one atom or group of atoms to another;
   4. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   
4. The indicator should be added:
   1. only at the suggestion of the supervisor;
   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. in small quantities, to avoid the errors in observations and in calculations;
   
   
5. Titration as a laboratory operation involves:
   1. a mass measurement;
   2. a pH indicator that changes color depending on the pH of the solution;
   3. a pH-metter;
   4. a standard or referential reactive;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. H₂O + CO₂ -> H₂CO₃
   4. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   5. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
2. Densitatea solutiilor depinde de:
   1. presiune;
   2. concentratie;
   3. temperatura;
   4. furnizor;
   5. cantitate;
   
   
3. Un proces redox:
   1. implica schimbarea a starilor de agregare ale unor participanti la reactie;
   2. apare numai atunci cānd se amesteca substante gresit īn laborator;
   3. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   4. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   5. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   
   
4. Trebuie adaugat indicatorul:
   1. numai la sugestia supraveghetorului;
   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. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   
   
5. Titrarea ca o operatiune de laborator implica:
   1. masurarea masei;
   2. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   3. un pH-metru;
   4. un standard sau reactiv de referinta;
   5. o solutie de sare;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. Reactions between acids and bases:
   1. are rarely useful, and even rarely used;
   2. have as effect the change of the color of a solution;
   3. have as a consequence the dissolution of a salt;
   4. are all exothermic, being therefore dangerous outside of the laboratory;
   
   
2. 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 liquid in the burette should be at the same level before and after conducting the experiment;
   4. the principle of the conservation of the energy;
   
   
3. A redox process:
   1. involves changing of the oxidation states of some participants to the reaction;
   2. occurs only when we mix wrong substances in the laboratory;
   3. involves a transfer of electrons from one atom or group of atoms to another;
   4. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
4. Titration as a laboratory operation involves:
   1. a pH-metter;
   2. a volume measurement;
   3. a natrium hydroxide solution;
   4. a pH indicator that changes color depending on the pH of the solution;
   
   
5. The indicator should be added:
   1. only at the suggestion of the supervisor;
   2. to indicate our safety limits when we dealt with chemicals;
   3. to provide a color change at equivalence point;
   4. in small quantities, to avoid the errors in observations and in calculations;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Reactiile īntre acizi si baze:
   1. sunt rareori utile, si chiar mai rar utilizate;
   2. au ca efect schimbarea culorii unei solutii;
   3. au drept consecinta dizolvarea unei sari;
   4. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   5. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   
   
2. 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. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   4. principiul conservarii energiei;
   
   
3. Un proces redox:
   1. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   2. apare numai atunci cānd se amesteca substante gresit īn laborator;
   3. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   4. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
4. Titrarea ca o operatiune de laborator implica:
   1. un pH-metru;
   2. masurarea volumului;
   3. o solutie de hidroxid de sodiu;
   4. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   
   
5. Trebuie adaugat indicatorul:
   1. numai la sugestia supraveghetorului;
   2. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   3. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   4. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. A redox process:
   1. occurs only when we mix wrong substances in the laboratory;
   2. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. is always fast and safe;
   4. involves changing of the aggregation states of some participants to the reaction;
   
   
2. The density of the solutions depends on:
   1. temperature;
   2. quantity;
   3. time elapsed since were prepared;
   4. concentration;
   
   
3. In the calculations:
   1. are necessary to discuss with our colleagues;
   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 use our phones;
   
   
4. Titration as a laboratory operation involves:
   1. a volume measurement;
   2. a standard or referential reactive;
   3. a mass measurement;
   4. a sulphuric acid solution;
   
   
5. The following chemical reactions were used in the experiments:
   1. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   2. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. H₂O + CO₂ -> H₂CO₃
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Un proces redox:
   1. apare numai atunci cānd se amesteca substante gresit īn laborator;
   2. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. este īntotdeauna rapid si sigur;
   4. implica schimbarea a starilor de agregare ale unor participanti la reactie;
   5. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   
   
2. Densitatea solutiilor depinde de:
   1. temperatura;
   2. cantitate;
   3. timpul scurs de cand au fost pregatite;
   4. concentratie;
   
   
3. In calcule:
   1. este necesar sa discutam cu colegii;
   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 utilizam telefoanele;
   
   
4. Titrarea ca o operatiune de laborator implica:
   1. masurarea volumului;
   2. un standard sau reactiv de referinta;
   3. masurarea masei;
   4. o solutie de acid sulfuric;
   
   
5. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   2. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. H₂O + CO₂ -> H₂CO₃
   5. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The indicator should be added:
   1. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   2. to provide a color change at equivalence point;
   3. only at the suggestion of the supervisor;
   4. to indicate our safety limits when we dealt with chemicals;
   
   
2. The following chemical reactions were used in the experiments:
   1. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   2. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. H₂O + CO₂ -> H₂CO₃
   
   
3. Reactions between acids and bases:
   1. always have as a consequence the formation of a quantity of water;
   2. have as effect the change of the color of a solution;
   3. are always fast, taking place almost instantaneously;
   4. have as a consequence the dissolution of a salt;
   
   
4. When a chemical reaction is balanced, following should be considered:
   1. the liquid in the burette should be at the same level before and after conducting the experiment;
   2. the principle of the conservation of the number of atoms for each element;
   3. all glassware should be clean before and after conducting the experiment;
   4. all glassware should be clean before, after and during the experiment;
   
   
5. Titration as a laboratory operation involves:
   1. a pH indicator that changes color depending on the pH of the solution;
   2. a salt solution;
   3. a standard or referential reactive;
   4. a mass measurement;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Trebuie adaugat indicatorul:
   1. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   2. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   3. numai la sugestia supraveghetorului;
   4. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   
   
2. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   2. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. H₂O + CO₂ -> H₂CO₃
   
   
3. Reactiile īntre acizi si baze:
   1. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   2. au ca efect schimbarea culorii unei solutii;
   3. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   4. au drept consecinta dizolvarea unei sari;
   5. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   
   
4. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   2. principiul conservarii numarul de atomi pentru fiecare element;
   3. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   4. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   5. principiul conservarii volumului;
   
   
5. Titrarea ca o operatiune de laborator implica:
   1. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   2. o solutie de sare;
   3. un standard sau reactiv de referinta;
   4. masurarea masei;
   5. un pH-metru;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The following chemical reactions were used in the experiments:
   1. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. H₂O + CO₂ -> H₂CO₃
   
   
2. Reactions between acids and bases:
   1. are always fast, taking place almost instantaneously;
   2. always have as a consequence the formation of a quantity of water;
   3. have as effect the change of the color of a solution;
   4. are rarely useful, and even rarely used;
   
   
3. 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 volume;
   4. the principle of the conservation of the energy;
   
   
4. A redox process:
   1. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. involves changing of the aggregation states of some participants to the reaction;
   3. is always fast and safe;
   4. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   
5. In the calculations:
   1. are necessary to use some formulas expressing in different ways the concentration;
   2. are necessary to draw the tables in our notebooks after completing of the experiment;
   3. are necessary to establish the coefficients of the chemical reaction;
   4. are necessary to discuss with our colleagues;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. H₂O + CO₂ -> H₂CO₃
   
   
2. Reactiile īntre acizi si baze:
   1. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   2. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   3. au ca efect schimbarea culorii unei solutii;
   4. sunt rareori utile, si chiar mai rar utilizate;
   
   
3. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   2. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   3. principiul conservarii volumului;
   4. principiul conservarii energiei;
   
   
4. Un proces redox:
   1. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. implica schimbarea a starilor de agregare ale unor participanti la reactie;
   3. este īntotdeauna rapid si sigur;
   4. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   
5. In calcule:
   1. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   2. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   3. este necesara stabilirea coeficientilor reactiei chimice;
   4. este necesar sa discutam cu colegii;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. 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 + CO₃^2- -> H₂CO₃ + Cl^-
   4. HCl + HO⁺ -> H₂O + Cl⁺
   
   
2. For a water sample following measures may be quantitatively expressed:
   1. mineral acidity;
   2. total alkalinity;
   3. hardness;
   4. color;
   
   
3. In the laboratory were analyzed:
   1. the color of the water;
   2. the softness of the water;
   3. the hardness of the water;
   4. the boiling point of the water;
   
   
4. We may say the followings:
   1. natural water may contain organic matter and living organisms;
   2. purification of the water may include physical processes;
   3. purification of the water may include chemical processes;
   4. water is pure only when is taken from a good freshwater mountain stream;
   
   
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 + PO₄^3- -> HPO₄^2- + Cl^-
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + HO⁺ -> H₂O + Cl⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   2. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   3. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   4. HCl + HO⁺ -> H₂O + Cl⁺
   5. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
2. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. aciditate minerala;
   2. alcalinitate totala;
   3. duritate;
   4. culoare;
   5. puritate;
   
   
3. Īn laborator au fost analizate:
   1. culoarea apei;
   2. moliciunea apei;
   3. duritatea apei;
   4. punctul de fierbere al apei;
   5. solubilitatea apei;
   
   
4. Putem spune urmatoarele:
   1. apa naturala poate contine materie organica si organisme vii;
   2. purificarea apei poate include procedee fizice;
   3. purificarea apei poate include procese chimice;
   4. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   
   
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 + PO₄^3- -> HPO₄^2- + Cl^-
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + HO⁺ -> H₂O + Cl⁺
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   2. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   3. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   4. NaOH + HCOO⁺ -> HCOONa + HO⁺
   
   
2. In the laboratory were analyzed:
   1. the mass of the water;
   2. the softness of the water;
   3. the boiling point of the water;
   4. the alkalinity of the water;
   
   
3. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   4. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   
4. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + HO^- -> H₂O + Cl^-
   2. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   
   
5. We may say the followings:
   1. purification of the water may include chemical processes;
   2. water is good for drinking, it is nothing to be analysed;
   3. when water contains dissolved minerals and gases is bad for drinking;
   4. water is a good polar solvent;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CO₃^2- -> HCO₃^- + HO^-
   2. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   3. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   4. NaOH + HCOO⁺ -> HCOONa + HO⁺
   5. NaOH + HCOO^- -> HCOONa + HO^-
   
   
2. Īn laborator au fost analizate:
   1. masa apei;
   2. moliciunea apei;
   3. punctul de fierbere al apei;
   4. alcalinitatea apei;
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   4. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + HO^- -> H₂O+Cl^-
   2. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   5. HCl + CO₃^2- -> HCO₃^- + Cl^-
   
   
5. Putem spune urmatoarele:
   1. purificarea apei poate include procese chimice;
   2. apa este buna pentru consum, nu este nimic de a fi analizat;
   3. atunci cānd apa contine minerale dizolvate si gaze este rea pentru baut;
   4. apa este un solvent polar bun;
   5. purificarea apei poate include procedee fizice;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. In the laboratory were analyzed:
   1. the hardness of the water;
   2. the alkalinity of the water;
   3. the temperature of the water;
   4. the color of the water;
   
   
2. For a water sample following measures may be quantitatively expressed:
   1. total alkalinity;
   2. total acidity;
   3. permanent alkalinity;
   4. purity;
   
   
3. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + Cl⁺ -> NaCl + HO⁺
   2. NaOH + NO₃^- -> NaNO₃ + HO^-
   3. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   4. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   
   
4. We may say the followings:
   1. purification of the water may include physical processes;
   2. purification of the water may include biological processes;
   3. natural water may contain organic matter and living organisms;
   4. water is pure only when is taken from a good freshwater mountain stream;
   
   
5. EDTA is used:
   1. as reagent for determining the hardness of the water;
   2. for complexing of Na¹⁺ and K¹⁺ ions;
   3. for complexing of Ca²⁺ and Mg²⁺ ions;
   4. for indication of the equilibrium point in the reaction;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Īn laborator au fost analizate:
   1. duritatea apei;
   2. alcalinitatea apei;
   3. temperatura apei;
   4. culoarea apei;
   5. punctul de fierbere al apei;
   
   
2. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. alcalinitate totala;
   2. aciditate totala;
   3. alcalinitate permanenta;
   4. puritate;
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + Cl⁺ -> NaCl + HO⁺
   2. NaOH + NO₃^- -> NaNO₃ + HO^-
   3. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   4. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   5. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   
   
4. Putem spune urmatoarele:
   1. purificarea apei poate include procedee fizice;
   2. purificarea apei poate include procese biologice;
   3. apa naturala poate contine materie organica si organisme vii;
   4. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   
   
5. EDTA este utilizat:
   1. ca reactiv pentru determinarea duritatii apei;
   2. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   3. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   4. pentru indicarea punctului de echilibru īn reactie;
   5. ca masura de siguranta;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. For a water sample following measures may be quantitatively expressed:
   1. mineral acidity;
   2. total acidity;
   3. permanent alkalinity;
   4. hardness;
   
   
2. 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 + CO₃^2- -> NaHCO₃^- + HO^-
   4. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   
   
3. We may say the followings:
   1. purification of the water may include biological processes;
   2. water is a good polar solvent;
   3. purification of the water may include chemical processes;
   4. water is pure only when is taken from a good freshwater mountain stream;
   
   
4. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   2. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   
   
5. EDTA is used:
   1. for complexing of Ca²⁺ and Mg²⁺ ions;
   2. for safety precautions purposes;
   3. for recharging of the resin for water softening;
   4. for complexing of Na¹⁺ and K¹⁺ ions;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. aciditate minerala;
   2. aciditate totala;
   3. alcalinitate permanenta;
   4. duritate;
   5. alcalinitate totala;
   
   
2. 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 + CO₃^2- -> HCO₃^- + HO^-
   4. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   5. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   
   
3. Putem spune urmatoarele:
   1. purificarea apei poate include procese biologice;
   2. apa este un solvent polar bun;
   3. purificarea apei poate include procese chimice;
   4. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   5. atunci cānd apa contine minerale dizolvate si gaze este rea pentru baut;
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   2. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   
   
5. EDTA este utilizat:
   1. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   2. ca masura de siguranta;
   3. pentru reīncarcarea rasinii la dedurizarea apei;
   4. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   5. ca reactiv pentru determinarea duritatii apei;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   2. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   3. NaOH + Cl⁺ -> NaCl + HO⁺
   4. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   
   
2. For a water sample following measures may be quantitatively expressed:
   1. purity;
   2. total acidity;
   3. color;
   4. total alkalinity;
   
   
3. We may say the followings:
   1. purification of the water may include biological processes;
   2. purification of the water may include labeling processes;
   3. water is a good polar solvent;
   4. purification of the water may include chemical processes;
   
   
4. 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;
   
   
5. EDTA is used:
   1. for complexing of Na¹⁺ and K¹⁺ ions;
   2. for safety precautions purposes;
   3. for complexing of Ca²⁺ and Mg²⁺ ions;
   4. as reagent for determining the hardness of the water;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   2. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   3. NaOH + Cl⁺ -> NaCl + HO⁺
   4. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   
   
2. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. puritate;
   2. aciditate totala;
   3. culoare;
   4. alcalinitate totala;
   
   
3. Putem spune urmatoarele:
   1. purificarea apei poate include procese biologice;
   2. purificarea apei poate include procesele de etichetare;
   3. apa este un solvent polar bun;
   4. purificarea apei poate include procese chimice;
   
   
4. 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;
   
   
5. EDTA este utilizat:
   1. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   2. ca masura de siguranta;
   3. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   4. ca reactiv pentru determinarea duritatii 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. H⁺ + Fe -> H₂ + Fe²⁺
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. Al₂O₃ + NaOH -> NaAlO₂
   4. Ni(CO)₄ -> Ni + CO
   
   
2. In studied corrosion processes:
   1. a gas is released at both corrosion of zinc and aluminum;
   2. always the metal changes its oxidation state;
   3. the metal it changes its oxidation state becoming an anion;
   4. a gas is released only the corrosion of zinc;
   
   
3. The zinc plate:
   1. was corroded in sulfuric solution;
   2. the surface is measured before and after immersing it in H₂SO₄;
   3. the mass is measured before and after immersing it in H₂SO₄;
   4. was degreased in sulfuric acid solution;
   
   
4. The aluminum plate:
   1. the mass 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;
   
   
5. Corrosion of metals:
   1. takes place merely from exposure to moisture in air;
   2. is the destruction of metals under the action of external factors;
   3. is the protection in time to chemical agents;
   4. is a beneficial process that shows the stability of metals;
   
   

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⁺ + Fe -> H₂ + Fe²⁺
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. Al₂O₃ + NaOH -> NaAlO₂
   4. Ni(CO)₄ -> Ni + CO
   5. H⁺ + Zn -> H₂ + Zn²⁺
   
   
2. Īn procesele de coroziune studiate:
   1. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   2. īntotdeauna metalul isi schimba starea de oxidare;
   3. metalul isi schimba starea de oxidare pentru a deveni un anion;
   4. un gaz este eliberat numai la corodarea zincului;
   
   
3. Pentru placa de zinc:
   1. a fost corodata īn solutie sulfuric;
   2. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   3. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   4. a fost degresata īn solutie de acid sulfuric;
   5. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   
   
4. Pentru placa de aluminiu:
   1. masa este masurata īnainte si dupa imersia īn NaOH;
   2. a fost degresata īn solutie de hidroxid de sodiu;
   3. 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 implicata īn metoda gravimetrica de analiza a coroziunii
   
   
5. Coroziunea metalelor:
   1. are loc pur si simplu prin expunerea la umiditate īn aer;
   2. este distrugerea metalelor sub actiunea factorilor externi;
   3. este protectia de durata impotriva agentilor chimici;
   4. este un proces benefic care arata stabilitatea metalelor;
   
   

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

1. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an cation;
   2. a gas is released only the corrosion of zinc;
   3. a gas is released at both corrosion of zinc and aluminum;
   4. the metal it changes its oxidation state becoming an anion;
   
   
2. Which of the following reactions may be called as of corrosion:
   1. Ni(CO)₄ -> Ni + CO
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
3. The aluminum plate:
   1. the volume is measured before and after immersing it in NaOH;
   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;
   
   
4. 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. the surface is measured before and after immersing it in H₂SO₄;
   4. was degreased in sulfuric acid solution;
   
   
5. Corrosion of metals:
   1. takes place merely from exposure to moisture in air;
   2. is a beneficial process that shows the stability of metals;
   3. may provide useful raw materials for analysis;
   4. can be reduced by electroplating;
   
   

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

1. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un cation;
   2. un gaz este eliberat numai la corodarea zincului;
   3. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   4. metalul isi schimba starea de oxidare pentru a deveni un anion;
   5. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   
   
2. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Ni(CO)₄ -> Ni + CO
   2. Al₂O₃ + NaOH -> NaAlO₂
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
3. Pentru placa de aluminiu:
   1. volumul se masoara īnainte si dupa imersia īn NaOH;
   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;
   
   
4. 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. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   4. a fost degresata īn solutie de acid sulfuric;
   
   
5. Coroziunea metalelor:
   1. are loc pur si simplu prin expunerea la umiditate īn aer;
   2. este un proces benefic care arata stabilitatea metalelor;
   3. poate furniza materii prime utile pentru analiza;
   4. poate fi redusa prin galvanizare;
   
   

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. Ni(CO)₄ -> Ni + CO
   3. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   4. H⁺ + Fe -> H₂ + Fe²⁺
   
   
2. Corrosion of metals:
   1. may provide useful raw materials for analysis;
   2. is a beneficial process that shows the stability of metals;
   3. can be reduced by passivation;
   4. can be reduced by electroplating;
   
   
3. The aluminum plate:
   1. was involved in the volumetric method of corrosion analysis
   2. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   3. the volume is measured before and after immersing it in NaOH;
   4. was corroded in sodium hydroxide solution;
   
   
4. The zinc plate:
   1. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   2. the mass is measured before and after immersing it in H₂SO₄;
   3. the volume is measured before and after immersing it in H₂SO₄;
   4. was involved in the gravimetric method of corrosion analysis
   
   
5. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an cation;
   2. the metal it changes its oxidation state becoming an anion;
   3. a gas is released only the corrosion of aluminum;
   4. always the metal changes its oxidation state;
   
   

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. Ni(CO)₄ -> Ni + CO
   3. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   4. H⁺ + Fe -> H₂ + Fe²⁺
   5. H⁺ + Zn -> H₂ + Zn²⁺
   
   
2. Coroziunea metalelor:
   1. poate furniza materii prime utile pentru analiza;
   2. este un proces benefic care arata stabilitatea metalelor;
   3. poate fi redusa prin pasivare;
   4. poate fi redusa prin galvanizare;
   5. este protectia de durata impotriva agentilor chimici;
   
   
3. Pentru placa de aluminiu:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   3. volumul se masoara īnainte si dupa imersia īn NaOH;
   4. a fost corodata īn solutie de hidroxid de sodiu;
   5. a fost degresata īn solutie de hidroxid de sodiu;
   
   
4. Pentru placa de zinc:
   1. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   2. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   3. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   5. a fost degresata īn solutie de acid sulfuric;
   
   
5. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un cation;
   2. metalul isi schimba starea de oxidare pentru a deveni un anion;
   3. un gaz este eliberat numai la corodarea aluminiului;
   4. īntotdeauna metalul isi schimba starea de oxidare;
   5. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   
   

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. Al₂O₃ + NaOH -> NaAlO₂
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. Fe₂O₃ + CO -> Fe + CO₂
   4. ZnO + CO -> Zn + CO₂
   
   
2. Corrosion of metals:
   1. is the destruction of metals under the action of external factors;
   2. is helping in the process of cleaning the metals surfaces;
   3. takes place merely from exposure to moisture in air;
   4. is a beneficial process that shows the stability of metals;
   
   
3. The zinc plate:
   1. the mass is measured before and after immersing it in H₂SO₄;
   2. the volume is measured before and after immersing it in H₂SO₄;
   3. was involved in the gravimetric method of corrosion analysis
   4. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   
   
4. The aluminum plate:
   1. was degreased in sodium hydroxide solution;
   2. the surface is measured before and after immersing it in NaOH;
   3. was corroded in sodium hydroxide solution;
   4. was involved in the volumetric method of corrosion analysis
   
   
5. In studied corrosion processes:
   1. a gas is released only the corrosion of zinc;
   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 cation;
   4. the metal it changes its oxidation state becoming an anion;
   
   

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. Al₂O₃ + NaOH -> NaAlO₂
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. Fe₂O₃ + CO -> Fe + CO₂
   4. ZnO + CO -> Zn + CO₂
   5. Ni(CO)₄ -> Ni + CO
   
   
2. Coroziunea metalelor:
   1. este distrugerea metalelor sub actiunea factorilor externi;
   2. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   3. are loc pur si simplu prin expunerea la umiditate īn aer;
   4. este un proces benefic care arata stabilitatea metalelor;
   
   
3. Pentru placa de zinc:
   1. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   2. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   3. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   4. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   
   
4. Pentru placa de aluminiu:
   1. a fost degresata īn solutie de hidroxid de sodiu;
   2. suprafata se masoara īnainte si dupa imersia īn NaOH;
   3. a fost corodata īn solutie de hidroxid de sodiu;
   4. a fost implicata īn metoda volumetrica de analiza a coroziunii
   
   
5. Īn procesele de coroziune studiate:
   1. un gaz este eliberat numai la corodarea zincului;
   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 cation;
   4. metalul isi schimba starea de oxidare pentru a deveni un anion;
   
   

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. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   2. ZnO + CO -> Zn + CO₂
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
2. In studied corrosion processes:
   1. when a gas is released its volume depends on the amount of metal corroded;
   2. a gas is released only the corrosion of aluminum;
   3. the metal it changes its oxidation state becoming an cation;
   4. the metal it changes its oxidation state becoming an anion;
   
   
3. Corrosion of metals:
   1. can be reduced by electroplating;
   2. is helping in the process of cleaning the metals surfaces;
   3. may provide useful raw materials for analysis;
   4. is the destruction of metals under the action of external factors;
   
   
4. The zinc plate:
   1. the mass is measured before and after immersing it in H₂SO₄;
   2. the surface is measured before and after immersing it in H₂SO₄;
   3. was degreased in sulfuric acid solution;
   4. was involved in the volumetric method of corrosion analysis
   
   
5. The aluminum plate:
   1. was involved in the volumetric method of corrosion analysis
   2. the mass is measured before and after immersing it in NaOH;
   3. was degreased in sodium hydroxide solution;
   4. was involved in the gravimetric method of corrosion analysis
   
   

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. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   2. ZnO + CO -> Zn + CO₂
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. Al₂O₃ + NaOH -> NaAlO₂
   5. Ni(CO)₄ -> Ni + CO
   
   
2. Īn procesele de coroziune studiate:
   1. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   2. un gaz este eliberat numai la corodarea aluminiului;
   3. metalul isi schimba starea de oxidare pentru a deveni un cation;
   4. metalul isi schimba starea de oxidare pentru a deveni un anion;
   
   
3. Coroziunea metalelor:
   1. poate fi redusa prin galvanizare;
   2. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   3. poate furniza materii prime utile pentru analiza;
   4. este distrugerea metalelor sub actiunea factorilor externi;
   
   
4. Pentru placa de zinc:
   1. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   2. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   3. a fost degresata īn solutie de acid sulfuric;
   4. a fost implicata īn metoda volumetrica de analiza a coroziunii
   5. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   
   
5. Pentru placa de aluminiu:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. masa este masurata īnainte si dupa imersia īn NaOH;
   3. a fost degresata īn solutie de hidroxid de sodiu;
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   
   

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

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

1. Intensitatea curentului:
   1. afecteaza numai cantitatea de nichel depus;
   2. ar trebui sa fie ajustata de catre tehnicieni, nu avem nimic de a face acolo;
   3. nu afecteaza calitatea nici cantitatea nichelului depus;
   4. trebuie sa fie ajustata cand se incepe experimentul;
   
   
2. La nichelare urmatoarele reactii au avut loc:
   1. la anod (+), īn contact cu piesa de nichel, Ni⁰ - 2e^- -> Ni²⁺
   2. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la anod: O^2- - 2e^- -> O₂⁰
   3. la catod (-), īn legatura cu piesa metalica, Ni⁰ - 2e^- -> Ni²⁺
   4. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la catod: O^2- - 2e^- -> O₂⁰
   5. la anod (+), īn legatura cu piesa de nichel, Ni²⁺ + 2e^- -> Ni⁰
   
   
3. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea gazelor perfecte;
   2. legea electrolizei;
   3. legea conservarii energiei;
   4. conservarea numarului de atomi pentru fiecare element;
   
   
4. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. este redusa prin adaosuri de saruri;
   2. este īmbunatatita prin adaosuri de saruri;
   3. depinde de potentialul sursei utilizate;
   4. depinde de intensitatea curentului utilizat;
   5. este relativ mare;
   
   
5. Este de asteptat ca masa de nichel depus sa fie:
   1. mai mare decāt cea teoretica calculata;
   2. proportionala cu timpul de nichelare;
   3. invers proportionala cu suprafata probei;
   4. 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 intensity of the current used;
   2. inversely proportional with the nickel plating time;
   3. inversely proportional with the intensity of the current used;
   4. 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 high densities of current oxygen anions (O^2-) have the tendency to discharge at the anode: O^2- - 2e^- -> O₂⁰
   
   
3. Electrical conductivity of nickel salts solutions:
   1. is improved by salts additions;
   2. depends on the intensity of the current used;
   3. depends on the potential of the source used;
   4. is reduced by salts additions;
   
   
4. Theoretical mass of nickel deposited is calculated using:
   1. solutions laws;
   2. law of mass action;
   3. perfect gas law;
   4. the conservation of the energy law;
   
   
5. The intensity of the current:
   1. affect only the quantity of the nickel deposition;
   2. affect only the quality of the nickel deposition;
   3. is to be calculated before to start the experiment;
   4. is to be calculated after conducting the experiment;
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. It is expected to have a mass of nickel deposited:
   1. inversely proportional with the intensity of the current used;
   2. proportional with the intensity of the current used;
   3. inversely proportional with the surface of the sample;
   4. lower than the calculated theoretical one;
   
   
2. The intensity of the current:
   1. affect only the quality of the nickel deposition;
   2. is to be calculated after conducting the experiment;
   3. is to be calculated before to start the experiment;
   4. affect only the quantity of the nickel deposition;
   
   
3. Electrical conductivity of nickel salts solutions:
   1. depends on the intensity of the current used;
   2. is reduced by salts additions;
   3. depends on the potential of the source used;
   4. is relatively small;
   
   
4. Theoretical mass of nickel deposited is calculated using:
   1. the conservation of the number of atoms for each element law;
   2. solutions laws;
   3. perfect gas law;
   4. the conservation of the energy law;
   
   
5. At the nickel plating following reactions took place:
   1. at anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   2. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the anode: O^2- - 2e^- -> O₂⁰
   3. at anode (+), connected with nickel piece, Ni²⁺ + 2e^- -> Ni⁰
   4. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the cathode: 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. invers proportionala cu intensitatea curentului utilizat;
   2. proportionala cu intensitatea curentului utilizat;
   3. invers proportionala cu suprafata probei;
   4. mai mica decāt cea teoretica calculata;
   
   
2. Intensitatea curentului:
   1. afecteaza numai calitatea depunerii nichelului;
   2. se calculeaza dupa efectuarea experimentului;
   3. trebuie sa fie calculata īnainte de a īncepe experimentul;
   4. afecteaza numai cantitatea de nichel depus;
   5. ar trebui sa fie ajustata de catre tehnicieni, nu avem nimic de a face acolo;
   
   
3. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. depinde de intensitatea curentului utilizat;
   2. este redusa prin adaosuri de saruri;
   3. depinde de potentialul sursei utilizate;
   4. este relativ mica;
   5. este relativ mare;
   
   
4. Masa teoretica de nichel depus se calculeaza folosind:
   1. conservarea numarului de atomi pentru fiecare element;
   2. legea solutilor;
   3. legea gazelor perfecte;
   4. legea conservarii energiei;
   
   
5. La nichelare urmatoarele reactii au avut loc:
   1. la anod (+), īn contact cu piesa de nichel, Ni⁰ - 2e^- -> Ni²⁺
   2. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la anod: O^2- - 2e^- -> O₂⁰
   3. la anod (+), īn legatura cu piesa de nichel, Ni²⁺ + 2e^- -> Ni⁰
   4. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la catod: O^2- - 2e^- -> O₂⁰