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 energy;
   3. all are moving in the same direction;
   4. are considered to be at the same temperature, but may have different energies;
   
   
2. 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 + H₂O \=\ NH₄⁺ + HO^-
   
   
3. The time to the formation of the ring in the experiment is dependent on:
   1. the propagation of the species as neutral molecules and not as ions;
   2. the propagation of the species as ions and not as neutral molecules;
   3. the width of the tube and not of the length of the tube;
   4. the length of the tube and the width of the tube;
   
   
4. We may say the followings:
   1. the kinetic energy of a molecule is affected by temperature, pressure and size of the molecule;
   2. the molecules have speeds only in gaseous state;
   3. the molecules have energy in all gaseous, liquid and solid states;
   4. the molecules have energy only in gaseous state;
   
   
5. The position of the ring in the experiment is dependent on:
   1. the propagation of the species as neutral molecules and not as ions;
   2. the concentrations of the solutions used;
   3. the mode energy or mode speed of each involved species;
   4. the speed of diffusion of each involved species;
   
   

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 energie;
   3. toate se deplaseaza īn aceeasi directie;
   4. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   
   
2. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H⁺ + HO^- \=\ H₂O
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. H₂O \=\ H⁺ + HO^-
   4. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   5. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   2. propagarea speciilor ca ionii si nu ca si molecule neutre;
   3. latimea tubului si nu lungimea tubului;
   4. lungimea tubului si latimea tubului;
   
   
4. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. energia cinetica a unei molecule este afectata de temperatura, presiune si dimensiunea moleculei;
   2. moleculele au viteze numai īn stare gazoasa;
   3. moleculele au energie īn toate starile gazoasa, lichida si solida;
   4. moleculele au energie numai īn stare gazoasa;
   5. moleculele au viteze numai īn stare gazoasa si lichida;
   
   
5. Pozitia inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   2. concentratiile solutiilor utilizate;
   3. viteza la moda sau energia la moda a fiecarei specii implicate;
   4. viteza de difuzie a fiecarei specii implicate;
   5. latimea tubului si nu lungimea tubului;
   
   

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 energies;
   2. all are moving in an arbitrary direction;
   3. all have same speed;
   4. are considered to be at the same temperature, but may have different speeds;
   
   
2. The position 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 real speeds and not the virtual speeds of each involved species;
   4. the speed of diffusion of each involved species;
   
   
3. We may say the followings:
   1. diffusion process appears in all gaseous, liquid and solid states;
   2. the molecules have speeds only in gaseous state;
   3. the molecules have energy only in gaseous and liquid states;
   4. diffusion process appears only in gaseous and liquid states;
   
   
4. The time to the formation of the ring in the experiment is dependent on:
   1. the real speeds and not the virtual speeds of each involved species;
   2. the propagation of the species as ions and not as neutral molecules;
   3. the propagation of the species as neutral molecules and not as ions;
   4. the length of the tube and the width of the tube;
   
   
5. At the ends of the tube following equilibrium reactions occurs:
   1. NH₄⁺ + Cl^- \=\ NH₄Cl
   2. NH₃ + HCl \=\ NH₄Cl
   3. H⁺ + HO^- \=\ H₂O
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   

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 diferite energii;
   2. toate se īndreapta īntr-o directie arbitrara;
   3. toate au aceeasi viteza;
   4. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   
   
2. Pozitia 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. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   4. viteza de difuzie a fiecarei specii implicate;
   
   
3. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. proces de difuzie apare īn toate starile gazoasa, lichida si solida;
   2. moleculele au viteze numai īn stare gazoasa;
   3. moleculele au energie numai īn stare gazoasa si lichida;
   4. proces de difuzie apare numai īn stare gazoasa si lichida;
   5. proces de difuzie apare numai īn stare gazoasa;
   
   
4. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   2. propagarea speciilor ca ionii si nu ca si molecule neutre;
   3. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   4. lungimea tubului si latimea tubului;
   5. lungimea tubului si nu latimea tubului;
   
   
5. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₄⁺ + Cl^- \=\ NH₄Cl
   2. NH₃ + HCl \=\ NH₄Cl
   3. H⁺ + HO^- \=\ H₂O
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   

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. extracting the information necessary to calculate the speeds ratio;
   4. indication of the moment when we should pay attention to the experiment;
   
   
2. The time to the formation of the ring in the experiment is dependent on:
   1. the propagation of the species as neutral molecules and not as ions;
   2. the propagation of the species as ions and not as neutral molecules;
   3. the average energy or average speed of each involved species;
   4. the speed of diffusion of each involved species;
   
   
3. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all are moving in an arbitrary direction;
   2. all have same speed;
   3. are considered to be at the same temperature, but may have different speeds;
   4. all have same energy;
   
   
4. At the ends of the tube following equilibrium reactions occurs:
   1. NH₄⁺ + Cl^- \=\ NH₄Cl
   2. H⁺ + HO^- \=\ H₂O
   3. H₂O \=\ H⁺ + HO^-
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   
5. The position 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 average energy or average speed of each involved species;
   4. the concentrations of the solutions used;
   
   

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

1. Cronometrul este utilizat īn experimentul pentru:
   1. sincronizarea timpilor de difuzie;
   2. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   3. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   4. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   5. masurarea timpului de difuzie;
   
   
2. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   2. propagarea speciilor ca ionii si nu ca si molecule neutre;
   3. energia medie sau viteza medie a fiecarei specii implicate;
   4. viteza de difuzie a fiecarei specii implicate;
   
   
3. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate se īndreapta īntr-o directie arbitrara;
   2. toate au aceeasi viteza;
   3. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   4. toate au aceeasi energie;
   5. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   
   
4. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₄⁺ + Cl^- \=\ NH₄Cl
   2. H⁺ + HO^- \=\ H₂O
   3. H₂O \=\ H⁺ + HO^-
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   5. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   
   
5. Pozitia 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. energia medie sau viteza medie a fiecarei specii implicate;
   4. concentratiile solutiilor utilizate;
   5. propagarea speciilor ca ionii si nu ca si molecule neutre;
   
   

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

1. The position of the ring in the experiment is dependent on:
   1. the average energy or average speed of each involved species;
   2. the propagation of the species as neutral molecules and not as ions;
   3. the length of the tube and not of the width of the tube;
   4. the propagation of the species as ions and not as neutral molecules;
   
   
2. The fog observed during the experiment is due to:
   1. unproper illumination in the laboratory and our breathing;
   2. presence of the chlorine;
   3. presence of the ammonia;
   4. formation of ammonium chloride;
   
   
3. The time to the formation of the ring in the experiment is dependent on:
   1. the propagation of the species as ions and not as neutral molecules;
   2. the mode energy or mode speed of each involved species;
   3. the width of the tube and not of the length of the tube;
   4. the concentrations of the solutions used;
   
   
4. The chronometer is used in the experiment for:
   1. to keep us busy;
   2. extracting the information necessary to calculate the speeds ratio;
   3. measuring of the diffusion time;
   4. extracting the information necessary to calculate the diffusion coefficients;
   
   
5. We may say the followings:
   1. the molecules have speeds only in gaseous state;
   2. diffusion process appears only in gaseous state;
   3. the molecules have energy only in gaseous and liquid states;
   4. the molecules have energy only in gaseous state;
   
   

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

1. Pozitia inelului īn experimentul este dependenta de:
   1. energia medie sau viteza medie a fiecarei specii implicate;
   2. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   3. lungimea tubului si nu latimea tubului;
   4. propagarea speciilor ca ionii si nu ca si molecule neutre;
   
   
2. Ceata observata īn timpul experimentului se datoreaza:
   1. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   2. prezentei clorului;
   3. prezentei amoniacului;
   4. formarea clorurii de amoniu;
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca ionii si nu ca si molecule neutre;
   2. viteza la moda sau energia la moda a fiecarei specii implicate;
   3. latimea tubului si nu lungimea tubului;
   4. concentratiile solutiilor utilizate;
   
   
4. Cronometrul este utilizat īn experimentul pentru:
   1. sa ne tina ocupati;
   2. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   3. masurarea timpului de difuzie;
   4. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   5. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   
   
5. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. moleculele au viteze numai īn stare gazoasa;
   2. proces de difuzie apare numai īn stare gazoasa;
   3. moleculele au energie numai īn stare gazoasa si lichida;
   4. moleculele au energie numai īn stare gazoasa;
   
   

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. HCl + H₂O \=\ Cl^- + H₃O⁺
   2. NH₃ + HCl \=\ NH₄Cl
   3. H⁺ + HO^- \=\ H₂O
   4. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   
   
2. The position of the ring in the experiment is dependent on:
   1. the length of the tube and not of the width of the tube;
   2. the mode energy or mode speed of each involved species;
   3. the speed of diffusion of each involved species;
   4. the virtual speeds and not the real speeds of each involved species;
   
   
3. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all are moving in an arbitrary direction;
   2. all are moving in the same direction;
   3. all have same energy;
   4. are considered to be at the same temperature, but may have different energies;
   
   
4. The time to the formation of the ring in the experiment is dependent on:
   1. the length of the tube and not of the width of the tube;
   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 virtual speeds and not the real speeds of each involved species;
   
   
5. The fog observed during the experiment is due to:
   1. presence of the chlorine;
   2. unproper illumination in the laboratory or our breathing;
   3. presence of the ammonia;
   4. formation of ammonium chloride;
   
   

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

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

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

1. For gaseous state:
   1. the pressure is much lower than in liquid state;
   2. we need to take supplementary precautions in the laboratory;
   3. the pressure is unchanged when a chemical reaction occurs;
   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. oxigen were released as result of the decomposition;
   2. air were released as result of the decomposition;
   3. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   4. ozone were released as result of the decomposition;
   
   
3. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. Ag + O₂ -> Ag₂O;
   2. H₂O + O₂ -> H₂O₂;
   3. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   4. distillation of the liquid air;
   
   
4. A state equation for a real gas is:
   1. a relation obtained after conducting of the experiment;
   2. a relation between an unlimited number of state parameters;
   3. a relation between an certain number of state parameters;
   4. a relation which may involve some constants dependent of gas composition;
   
   
5. In the laboratory were studied:
   1. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   2. the lost of the mass of a solid as result of producing of some gas;
   3. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   4. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pentru stare gazoasa:
   1. presiunea este mult mai mica decāt īn stare lichida;
   2. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   3. presiunea este neschimbata cānd apare o reactie chimica;
   4. presiunea depinde de modelul care este utilizat pentru o aproxima;
   
   
2. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. oxigenul au fost eliberat ca urmare a descompunerii;
   2. aer a fost eliberat ca urmare a descompunerii;
   3. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   4. ozonul au fost eliberat ca urmare a descompunerii;
   5. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   
   
3. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. Ag + O₂ -> Ag₂O;
   2. H₂O + O₂ -> H₂O₂;
   3. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   4. distilarea aerului lichid;
   5. H₂O₂ -> H₂O + O₂;
   
   
4. O ecuatie de stare pentru un gaz real este:
   1. o relatie obtinut dupa efectuarea experimentului;
   2. o relatie īntre un numar nelimitat de parametri de stare;
   3. o relatie īntre un anumit numar de parametri de stare;
   4. o relatie care poate implica unele constante dependente de compozitia gazului;
   5. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   
   
5. Īn laborator s-au studiat:
   1. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   2. pierdut din masa de solid ca urmare a producerii unor gaze;
   3. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   4. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   5. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   
   

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

1. For gaseous state:
   1. the pressure is unchanged when a chemical reaction occurs;
   2. the pressure is exactly the same as in liquid state;
   3. the pressure is much lower than in liquid state;
   4. we need to take supplementary precautions in the laboratory;
   
   
2. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. opening a bubble water bottle;
   2. KClO₃ -> KCl + O₂;
   3. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   4. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   
   
3. A state equation for a real gas is:
   1. a relation derived to approximate the relation between state parameters;
   2. a relation which is always true, independent of the values of the state parameters;
   3. a relation between an unlimited number of state parameters;
   4. usable in the laboratory, but is not to be used somewhere else;
   
   
4. In the laboratory were studied:
   1. the producing of some gas as result of a lost of the mass of a solid;
   2. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   3. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   4. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   
   
5. The values taken from the experiment conducted in the laboratory indicated that:
   1. air were released as result of the decomposition;
   2. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   3. ozone were released as result of the decomposition;
   4. oxigen were released as result of the decomposition;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pentru stare gazoasa:
   1. presiunea este neschimbata cānd apare o reactie chimica;
   2. presiunea este exact la fel ca si īn stare lichida;
   3. presiunea este mult mai mica decāt īn stare lichida;
   4. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   
   
2. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. deschiderea unei sticle de apa cu bule;
   2. KClO₃ -> KCl + O₂;
   3. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   4. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   5. H₂O + O₂ -> H₂O₂;
   
   
3. O ecuatie de stare pentru un gaz real este:
   1. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   2. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   3. o relatie īntre un numar nelimitat de parametri de stare;
   4. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   5. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   
   
4. Īn laborator s-au studiat:
   1. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   2. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   3. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   4. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   5. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   
   
5. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. aer a fost eliberat ca urmare a descompunerii;
   2. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   3. ozonul au fost eliberat ca urmare a descompunerii;
   4. oxigenul au fost eliberat ca urmare a descompunerii;
   5. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   

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

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

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. O ecuatie de stare pentru un gaz real este:
   1. o relatie care poate implica unele constante dependente de compozitia gazului;
   2. o relatie īntre un anumit numar de parametri de stare;
   3. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   4. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   
   
2. Pentru stare gazoasa:
   1. presiunea este neschimbata cānd apare o reactie chimica;
   2. presiunea este mult mai mica decāt īn stare lichida;
   3. presiunea se pot modifica atunci cānd apare o reactie chimica;
   4. presiunea este mult mai mare decāt īn stare lichida;
   5. presiunea depinde de modelul care este utilizat pentru o aproxima;
   
   
3. Īn laborator s-au studiat:
   1. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   2. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   3. pierdut din masa de solid ca urmare a producerii unor gaze;
   4. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   5. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   
   
4. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   2. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   3. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   4. aer a fost eliberat ca urmare a descompunerii;
   
   
5. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   2. Ag₂O -> Ag + O₂;
   3. H₂O₂ -> H₂O + O₂;
   4. distilarea aerului lichid;
   
   

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

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

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. O ecuatie de stare pentru un gaz real este:
   1. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   2. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   3. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   4. o relatie obtinut dupa efectuarea experimentului;
   5. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   
   
2. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. H₂O + O₂ -> H₂O₂;
   2. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   3. KNO₃ -> KNO₂ + O₂;
   4. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   5. deschiderea unei sticle de apa cu bule;
   
   
3. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. aer a fost eliberat ca urmare a descompunerii;
   2. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   3. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   4. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   
   
4. Pentru stare gazoasa:
   1. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   2. presiunea este neschimbata cānd apare o reactie chimica;
   3. presiunea este aproximativ aceeasi ca si īn stare lichida;
   4. presiunea este mult mai mica decāt īn stare lichida;
   5. presiunea depinde de modelul care este utilizat pentru o aproxima;
   
   
5. Īn laborator s-au studiat:
   1. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   2. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   3. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   4. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   5. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   
   

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. H₂O + O₂ -> H₂O₂;
   2. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   3. KClO₃ -> KCl + O₂;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   
2. The values taken from the experiment conducted in the laboratory indicated that:
   1. ozone were released as result of the decomposition;
   2. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   3. oxigen were released as result of the decomposition;
   4. the ideal model of a gas approximated the worst the behavior of the released gas;
   
   
3. For gaseous state:
   1. we need to take supplementary precautions in the laboratory;
   2. it exists an equation for all, p · V = n · R · T;
   3. the pressure depends on the model which are used to approximate it;
   4. the pressure is unchanged when a chemical reaction occurs;
   
   
4. A state equation for a real gas is:
   1. a relation between an certain number of state parameters;
   2. a relation between an unlimited number of state parameters;
   3. a relation which takes into account certain deviations from the ideal model;
   4. a relation derived to approximate the relation between state parameters;
   
   
5. In the laboratory were studied:
   1. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   2. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   3. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   4. the lost of the mass of a solid as result of producing of some gas;
   
   

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. H₂O + O₂ -> H₂O₂;
   2. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   3. KClO₃ -> KCl + O₂;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   
2. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. ozonul au fost eliberat ca urmare a descompunerii;
   2. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   3. oxigenul au fost eliberat ca urmare a descompunerii;
   4. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   5. aer a fost eliberat ca urmare a descompunerii;
   
   
3. Pentru stare gazoasa:
   1. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   2. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   3. presiunea depinde de modelul care este utilizat pentru o aproxima;
   4. presiunea este neschimbata cānd apare o reactie chimica;
   5. presiunea este aproximativ aceeasi ca si īn stare lichida;
   
   
4. O ecuatie de stare pentru un gaz real este:
   1. o relatie īntre un anumit numar de parametri de stare;
   2. o relatie īntre un numar nelimitat de parametri de stare;
   3. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   4. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   
   
5. Īn laborator s-au studiat:
   1. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   2. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   3. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   4. pierdut din masa de solid ca urmare a producerii unor gaze;
   5. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When aluminum is identified:
   1. is identified as Al³⁺ cation;
   2. the presence of other ions may produce a false negative outcome;
   3. there are many identification reactions possible;
   4. using of alizarin along with ammonium hidroxide provide a red colored complex;
   
   
2. The paper requires before analysis of the sample:
   1. to be tested;
   2. to measure its surface;
   3. to be acidified;
   4. to be burned;
   
   
3. When lead is identified:
   1. precautions should be made for toxic wastes disposal;
   2. a violet complex appears;
   3. interference of other ions may affect the outcome;
   4. a blue complex appears;
   
   
4. Why moisten the paper with solution of sodium nitrate?
   1. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   2. to accomodate ourselves to use chemicals;
   3. to provide cations for analysis;
   4. to have something to do in the laboratory;
   
   
5. This method of analysis of metals and alloys is:
   1. too ancient to be used today in the laboratory;
   2. a gravimetric method of analysis;
   3. useful for alloys, not so useful for metals;
   4. a destructive method of analysis;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd aluminiu este identificat:
   1. este identificat ca cationul Al³⁺;
   2. prezenta altor ioni poate produce un rezultat fals negativ;
   3. exista multe reactii posibile de identificare;
   4. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un complex colorat rosu;
   5. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un indiciu mai selectiv cu privire la prezenta aluminiului;
   
   
2. Hartia necesita ca īnainte de analiza probei:
   1. sa fie testata;
   2. sa i se masoare suprafata;
   3. sa fie acidulata;
   4. sa fie arsa;
   5. sa fie uscata;
   
   
3. Cānd plumbul este identificat:
   1. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   2. apare un complex violet;
   3. interferenta altor ioni poate afecta rezultatul;
   4. apare un complex albastru;
   
   
4. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   2. sa ne acomodam in a utiliza substante chimice;
   3. pentru furniza cationi pentru analiza;
   4. pentru a avea ceva de a face īn laborator;
   5. pentru oprirea dupa un timp reactiei chimice care are loc;
   
   
5. Aceasta metoda de analiza de metale si aliaje este:
   1. prea veche pentru a fi utilizata īn prezent īn laborator;
   2. o metoda gravimetrica de analiza;
   3. utila pentru aliaje, nu atāt de utila pentru metale;
   4. o metoda distructiva de analiza;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. 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. a destructive method of analysis;
   4. not useful for both metals and alloys;
   
   
2. Why moisten the paper with solution of sodium nitrate?
   1. to accomodate ourselves to use chemicals;
   2. for stopping after a while the chemical reaction that takes place;
   3. to have something to do in the laboratory;
   4. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   
   
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. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   
   
4. When lead is identified:
   1. interference of other ions may affect the outcome;
   2. the reactions used clearly indicates its presence;
   3. a heat release is observed;
   4. a violet complex appears;
   
   
5. When aluminum is identified:
   1. is identified as Al²⁺ cation;
   2. is identified as Al¹⁺ cation;
   3. using of alizarin along with ammonium hidroxide provide a red colored complex;
   4. supplementary precautions should be taken, because the plates are made from aluminum too;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. 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. o metoda distructiva de analiza;
   4. nu este utila nici pentru metale nici pentru aliaje;
   5. o metoda nedistructiva de analiza;
   
   
2. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. sa ne acomodam in a utiliza substante chimice;
   2. pentru oprirea dupa un timp reactiei chimice care are loc;
   3. pentru a avea ceva de a face īn laborator;
   4. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   5. pentru furniza cationi pentru analiza;
   
   
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. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   5. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   
   
4. Cānd plumbul este identificat:
   1. interferenta altor ioni poate afecta rezultatul;
   2. reactiile utilizate īn mod clar ii indica prezenta;
   3. se observa o eliberare de caldura;
   4. apare un complex violet;
   
   
5. Cānd aluminiu este identificat:
   1. este identificat ca cationul Al²⁺;
   2. este identificat ca cationul Al¹⁺;
   3. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un complex colorat rosu;
   4. ar trebui sa fie luate masuri de precautie suplimentare deoarece talerele sunt realizate din aluminiu deasemenea;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When the electrical circuit is closed:
   1. elements from the metals are passed into solution as cations;
   2. elements from the metals are passed into solution as anions;
   3. elements from the solution are passed into sample as metals;
   4. electric current avoids the sample and the paper;
   
   
2. The paper requires before analysis of the sample:
   1. to be acidified;
   2. to be dry;
   3. to be tested;
   4. to be moistened with an electrolyte;
   
   
3. 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⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   4. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
4. When aluminum is identified:
   1. the presence of other ions may produce a false negative outcome;
   2. using of ammonium hidroxide is enough in order to have a clear guess about the presence of aluminum;
   3. is identified as Al²⁺ cation;
   4. the presence of other ions may produce a true positive outcome;
   
   
5. Why moisten the paper with solution of sodium nitrate?
   1. to accomodate ourselves to use chemicals;
   2. to be cut easily with scissors;
   3. for the paper to work as isolator;
   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 circuitul electric este īnchis:
   1. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   2. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   3. elemente din solutie sunt trecute īn proba ca metale;
   4. curent electric evita proba si hārtia;
   5. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   
   
2. Hartia necesita ca īnainte de analiza probei:
   1. sa fie acidulata;
   2. sa fie uscata;
   3. sa fie testata;
   4. sa fie umezita cu un electrolit;
   
   
3. 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⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   4. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
4. Cānd aluminiu este identificat:
   1. prezenta altor ioni poate produce un rezultat fals negativ;
   2. folosirea hidroxidului de amoniu este suficient pentru a avea indicii clare cu privire la prezenta aluminiului;
   3. este identificat ca cationul Al²⁺;
   4. prezenta altor ioni poate produce un rezultat adevarat pozitiv;
   5. este identificat ca cationul Al¹⁺;
   
   
5. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. sa ne acomodam in a utiliza substante chimice;
   2. sa fie taiat cu usurinta cu foarfeca;
   3. pentru ca hartia sa actioneze ca izolator;
   4. pentru oprirea dupa un timp reactiei chimice care are loc;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. This method of analysis of metals and alloys is:
   1. too ancient to be used today in the laboratory;
   2. useful for pure metals, not so useful for alloys;
   3. useful for alloys, not so useful for metals;
   4. useful for both metals and alloys;
   
   
2. When the electrical circuit is closed:
   1. surface of the sample is fastly covered by a protecting shield of electrons;
   2. water dissociation is inhibited;
   3. anions from the solution are passed into sample as metals;
   4. cations from the solution are passed into sample as metals;
   
   
3. When aluminum is identified:
   1. the presence of other ions may produce a false negative outcome;
   2. there are many identification reactions possible;
   3. is identified as Al³⁺ cation;
   4. the presence of other ions may produce a false positive outcome;
   
   
4. When lead is identified:
   1. dangerous substances are used;
   2. a red-brown complex appears;
   3. precautions should be made for toxic wastes disposal;
   4. interference of other ions may affect the outcome;
   
   
5. The paper requires before analysis of the sample:
   1. to be cut in small pieces;
   2. to be burned;
   3. to be dry;
   4. to be acidified;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Aceasta metoda de analiza de metale si aliaje este:
   1. prea veche pentru a fi utilizata īn prezent īn laborator;
   2. utila pentru metale pure, nu atāt de utila pentru aliaje;
   3. utila pentru aliaje, nu atāt de utila pentru metale;
   4. utila atāt pentru metale si aliaje;
   
   
2. Cānd circuitul electric este īnchis:
   1. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   2. disocierea apei este inhibata;
   3. anionii din solutie sunt trecuti īn proba ca metale;
   4. cationii din solutie sunt trecuti īn proba ca metale;
   
   
3. Cānd aluminiu este identificat:
   1. prezenta altor ioni poate produce un rezultat fals negativ;
   2. exista multe reactii posibile de identificare;
   3. este identificat ca cationul Al³⁺;
   4. prezenta altor ioni poate produce un rezultat fals pozitiv;
   5. prezenta altor ioni poate produce un rezultat adevarat negativ;
   
   
4. Cānd plumbul este identificat:
   1. sunt utilizate substante periculoase;
   2. apare un complex rosu-brun;
   3. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   4. interferenta altor ioni poate afecta rezultatul;
   5. apare un complex galben;
   
   
5. Hartia necesita ca īnainte de analiza probei:
   1. sa fie taiata īn bucati mici;
   2. sa fie arsa;
   3. sa fie uscata;
   4. sa fie acidulata;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. This method of analysis of metals and alloys is:
   1. a gravimetric method of analysis;
   2. useful for alloys, not so useful for metals;
   3. useful for both metals and alloys;
   4. not useful for both metals and alloys;
   
   
2. The paper requires before analysis of the sample:
   1. to be cut in small pieces;
   2. to measure its surface;
   3. to be weighted;
   4. to be burned;
   
   
3. 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 work as an electrolyte and to allow passing of the electrical current through moistened paper;
   
   
4. When lead is identified:
   1. interference of other ions may affect the outcome;
   2. a heat release is observed;
   3. a violet complex appears;
   4. a red-brown complex appears;
   
   
5. The electric charges after passing the metals into solution may be:
   1. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   2. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   3. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Aceasta metoda de analiza de metale si aliaje este:
   1. o metoda gravimetrica de analiza;
   2. utila pentru aliaje, nu atāt de utila pentru metale;
   3. utila atāt pentru metale si aliaje;
   4. nu este utila nici pentru metale nici pentru aliaje;
   
   
2. Hartia necesita ca īnainte de analiza probei:
   1. sa fie taiata īn bucati mici;
   2. sa i se masoare suprafata;
   3. sa fie cantarita;
   4. sa fie arsa;
   
   
3. 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 lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   5. pentru ca hartia sa actioneze ca izolator;
   
   
4. Cānd plumbul este identificat:
   1. interferenta altor ioni poate afecta rezultatul;
   2. se observa o eliberare de caldura;
   3. apare un complex violet;
   4. apare un complex rosu-brun;
   5. reactiile utilizate īn mod clar ii indica prezenta;
   
   
5. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   2. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   3. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   5. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the number of atoms for each element;
   2. the principle of the conservation of the volume;
   3. the principle of the conservation of the energy;
   4. the liquid in the burette should be at the same level before and after conducting the experiment;
   
   
2. The density of the solutions depends on:
   1. time elapsed since were prepared;
   2. temperature;
   3. quantity;
   4. concentration;
   
   
3. The indicator should be added:
   1. to provide a color change at equivalence point;
   2. only at the suggestion of the supervisor;
   3. in small quantities, to avoid the errors in observations and in calculations;
   4. only in special cases, when the burette is graded from its bottom to its top;
   
   
4. Reactions between acids and bases:
   1. are rarely useful, and even rarely used;
   2. have as a consequence the dissolution of a salt;
   3. are always fast, taking place almost instantaneously;
   4. have as effect the change of the color of a solution;
   
   
5. The following chemical reactions were used in the experiments:
   1. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   2. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. H₂O + CO₂ -> H₂CO₃
   4. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii numarul de atomi pentru fiecare element;
   2. principiul conservarii volumului;
   3. principiul conservarii energiei;
   4. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   5. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   
   
2. Densitatea solutiilor depinde de:
   1. timpul scurs de cand au fost pregatite;
   2. temperatura;
   3. cantitate;
   4. concentratie;
   
   
3. Trebuie adaugat indicatorul:
   1. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   2. numai la sugestia supraveghetorului;
   3. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   4. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   5. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   
   
4. Reactiile īntre acizi si baze:
   1. sunt rareori utile, si chiar mai rar utilizate;
   2. au drept consecinta dizolvarea unei sari;
   3. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   4. au ca efect schimbarea culorii unei solutii;
   5. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   
   
5. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   2. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   3. H₂O + CO₂ -> H₂CO₃
   4. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   5. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. In the calculations:
   1. are necessary to take some information from reagent bottles;
   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 take the results imediatly after these are available from others;
   
   
2. The following chemical reactions were used in the experiments:
   1. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. H₂O + CO₂ -> H₂CO₃
   4. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   
   
3. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the number of atoms for each element;
   2. the liquid in the burette should be at the same level before and after conducting the experiment;
   3. all glassware should be clean before, after and during the experiment;
   4. the principle of the conservation of the energy;
   
   
4. The indicator should be added:
   1. to provide a color change at equivalence point;
   2. in small quantities, to avoid the errors in observations and in calculations;
   3. to indicate our safety limits when we dealt with chemicals;
   4. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   
   
5. The density of the solutions depends on:
   1. provider;
   2. time elapsed since were prepared;
   3. concentration;
   4. quantity;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. In calcule:
   1. este necesar a se lua unele informatii de pe sticlele de reactivi;
   2. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   3. este necesara stabilirea coeficientilor reactiei chimice;
   4. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   
   
2. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. H₂O + CO₂ -> H₂CO₃
   4. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   
   
3. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii numarul de atomi pentru fiecare element;
   2. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   3. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   4. principiul conservarii energiei;
   5. principiul conservarii volumului;
   
   
4. Trebuie adaugat indicatorul:
   1. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   2. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   3. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   4. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   
   
5. Densitatea solutiilor depinde de:
   1. furnizor;
   2. timpul scurs de cand au fost pregatite;
   3. concentratie;
   4. cantitate;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The density of the solutions depends on:
   1. quantity;
   2. temperature;
   3. provider;
   4. time elapsed since were prepared;
   
   
2. Titration as a laboratory operation involves:
   1. an mixing of two ore more solutions;
   2. a salt solution;
   3. a standard or referential reactive;
   4. a natrium hydroxide solution;
   
   
3. The equivalence point is:
   1. the point in which a reactive should be added in the reaction flask;
   2. used to balance the equation;
   3. something rarely encountered in chemistry;
   4. the point in which a reactive should be added in the burette;
   
   
4. The following chemical reactions were used in the experiments:
   1. H₂O + CO₂ -> H₂CO₃
   2. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   4. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   
5. In the calculations:
   1. are necessary to take the results imediatly after these are available from others;
   2. are necessary to take some information from reagent bottles;
   3. are necessary to use our phones;
   4. are necessary to draw the tables in our notebooks after completing of the experiment;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Densitatea solutiilor depinde de:
   1. cantitate;
   2. temperatura;
   3. furnizor;
   4. timpul scurs de cand au fost pregatite;
   5. presiune;
   
   
2. Titrarea ca o operatiune de laborator implica:
   1. amestecul a doua sau mai multe solutii;
   2. o solutie de sare;
   3. un standard sau reactiv de referinta;
   4. o solutie de hidroxid de sodiu;
   5. o biureta;
   
   
3. Punctul de echivalenta este:
   1. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   2. folosit pentru a echilibra ecuatia;
   3. ceva rar īntālnit īn chimie;
   4. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   
   
4. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. H₂O + CO₂ -> H₂CO₃
   2. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   4. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   5. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   
   
5. In calcule:
   1. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   2. este necesar a se lua unele informatii de pe sticlele de reactivi;
   3. este necesar sa utilizam telefoanele;
   4. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   5. este necesar sa discutam cu colegii;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. Titration as a laboratory operation involves:
   1. a burette;
   2. a mass measurement;
   3. a pH-metter;
   4. a natrium hydroxide solution;
   
   
2. In the calculations:
   1. are necessary to take some information from reagent bottles;
   2. are necessary to use our phones;
   3. are necessary to establish the coefficients of the chemical reaction;
   4. are necessary to discuss with our colleagues;
   
   
3. The following chemical reactions were used in the experiments:
   1. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. H₂O + CO₂ -> H₂CO₃
   3. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   
   
4. The density of the solutions depends on:
   1. time elapsed since were prepared;
   2. pressure;
   3. temperature;
   4. provider;
   
   
5. A redox process:
   1. involves changing of the aggregation states of some participants to the reaction;
   2. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. is always fast and safe;
   4. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Titrarea ca o operatiune de laborator implica:
   1. o biureta;
   2. masurarea masei;
   3. un pH-metru;
   4. o solutie de hidroxid de sodiu;
   5. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   
   
2. In calcule:
   1. este necesar a se lua unele informatii de pe sticlele de reactivi;
   2. este necesar sa utilizam telefoanele;
   3. este necesara stabilirea coeficientilor reactiei chimice;
   4. este necesar sa discutam cu colegii;
   
   
3. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. H₂O + CO₂ -> H₂CO₃
   3. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   
   
4. Densitatea solutiilor depinde de:
   1. timpul scurs de cand au fost pregatite;
   2. presiune;
   3. temperatura;
   4. furnizor;
   
   
5. Un proces redox:
   1. implica schimbarea a starilor de agregare ale unor participanti la reactie;
   2. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. este īntotdeauna rapid si sigur;
   4. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the volume;
   2. the principle of the conservation of the number of atoms for each element;
   3. all glassware should be clean before, after and during the experiment;
   4. the liquid in the burette should be at the same level before and after conducting the experiment;
   
   
2. The density of the solutions depends on:
   1. concentration;
   2. pressure;
   3. quantity;
   4. time elapsed since were prepared;
   
   
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. is always fast and safe;
   4. involves changing of the aggregation states of some participants to the reaction;
   
   
4. The following chemical reactions were used in the experiments:
   1. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. H₂O + CO₂ -> H₂CO₃
   3. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   4. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   
5. The indicator should be added:
   1. to provide a color change at equivalence point;
   2. in small quantities, to avoid the errors in observations and in calculations;
   3. only in special cases, when the burette is graded from its bottom to its top;
   4. to indicate our safety limits when we dealt with chemicals;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii volumului;
   2. principiul conservarii numarul de atomi pentru fiecare element;
   3. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   4. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   
   
2. Densitatea solutiilor depinde de:
   1. concentratie;
   2. presiune;
   3. cantitate;
   4. timpul scurs de cand au fost pregatite;
   
   
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. este īntotdeauna rapid si sigur;
   4. implica schimbarea a starilor de agregare ale unor participanti la reactie;
   5. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
4. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. H₂O + CO₂ -> H₂CO₃
   3. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   4. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   
5. Trebuie adaugat indicatorul:
   1. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   2. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   3. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   4. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   5. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. We may say the followings:
   1. water is good for drinking, it is nothing to be analysed;
   2. purification of the water may include physical processes;
   3. purification of the water may include labeling processes;
   4. natural water may contain organic matter and living organisms;
   
   
2. For a water sample following measures may be quantitatively expressed:
   1. color;
   2. permanent alkalinity;
   3. mineral acidity;
   4. hardness;
   
   
3. In the laboratory the water were:
   1. biologically purified using the resin column;
   2. softened using the resin column;
   3. hardened using the resin column;
   4. complexed by using EDTA titrimetric method;
   
   
4. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   2. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   3. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   4. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   
   
5. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   3. NaOH + NO₃^- -> NaNO₃ + HO^-
   4. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Putem spune urmatoarele:
   1. apa este buna pentru consum, nu este nimic de a fi analizat;
   2. purificarea apei poate include procedee fizice;
   3. purificarea apei poate include procesele de etichetare;
   4. apa naturala poate contine materie organica si organisme vii;
   
   
2. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. culoare;
   2. alcalinitate permanenta;
   3. aciditate minerala;
   4. duritate;
   5. aciditate totala;
   
   
3. In laborator apa au fost:
   1. purificata biologic utilizānd coloana de rasina;
   2. dedurizata folosind coloana de rasina;
   3. calita folosind coloana de rasina;
   4. complexata prin metoda titrimetrica EDTA;
   5. acidulata pentru baut;
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   2. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   3. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   4. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   5. HCl + HO^- -> H₂O + Cl^-
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   3. NaOH + NO₃^- -> NaNO₃ + HO^-
   4. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   5. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   
   

FINAL TEST AT LABORATORY
Water analysis

1. In the laboratory the water were:
   1. complexed by using EDTA titrimetric method;
   2. alkalinized for drinking purposes;
   3. biologically purified using the resin column;
   4. acidified for drinking purposes;
   
   
2. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   2. NaOH + HCOO⁺ -> HCOONa + HO⁺
   3. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   4. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   
   
3. In the laboratory were analyzed:
   1. the hardness of the water;
   2. the mass of the water;
   3. the solubility of the water;
   4. the acidity of the water;
   
   
4. EDTA is used:
   1. for safety precautions purposes;
   2. for recharging of the resin for water softening;
   3. for complexing of Ca²⁺ and Mg²⁺ ions;
   4. for complexing of Na¹⁺ and K¹⁺ ions;
   
   
5. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + HO^- -> H₂O + Cl^-
   2. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   3. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   4. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. In laborator apa au fost:
   1. complexata prin metoda titrimetrica EDTA;
   2. alcalinizeaza pentru baut;
   3. purificata biologic utilizānd coloana de rasina;
   4. acidulata pentru baut;
   5. calita folosind coloana de rasina;
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   2. NaOH + HCOO⁺ -> HCOONa + HO⁺
   3. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   4. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   
   
3. Īn laborator au fost analizate:
   1. duritatea apei;
   2. masa apei;
   3. solubilitatea apei;
   4. aciditatea apei;
   
   
4. EDTA este utilizat:
   1. ca masura de siguranta;
   2. pentru reīncarcarea rasinii la dedurizarea apei;
   3. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   4. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + HO^- -> H₂O + Cl^-
   2. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   3. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   4. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   
   

FINAL TEST AT LABORATORY
Water analysis

1. We may say the followings:
   1. when water contains dissolved minerals and gases is bad for drinking;
   2. purification of the water may include biological processes;
   3. purification of the water may include chemical processes;
   4. purification of the water may include labeling processes;
   
   
2. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   2. NaOH + HCOO^- -> HCOONa + HO^-
   3. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   4. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   
   
3. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + CO₃^2- -> HCO₃^- + Cl^-
   3. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   4. HCl + HO^- -> H₂O + Cl^-
   
   
4. In the laboratory the water were:
   1. acidified for drinking purposes;
   2. alkalinized for drinking purposes;
   3. hardened using the resin column;
   4. complexed by using EDTA titrimetric method;
   
   
5. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Putem spune urmatoarele:
   1. atunci cānd apa contine minerale dizolvate si gaze este rea pentru baut;
   2. purificarea apei poate include procese biologice;
   3. purificarea apei poate include procese chimice;
   4. purificarea apei poate include procesele de etichetare;
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   2. NaOH + HCOO^- -> HCOONa + HO^-
   3. NaOH + CO₃^2- -> HCO₃^- + HO^-
   4. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   5. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + CO₃^2- -> HCO₃^- + Cl^-
   3. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   4. HCl + HO^- -> H₂O+Cl^-
   5. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   
   
4. In laborator apa au fost:
   1. acidulata pentru baut;
   2. alcalinizeaza pentru baut;
   3. calita folosind coloana de rasina;
   4. complexata prin metoda titrimetrica EDTA;
   5. dedurizata folosind coloana de rasina;
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   5. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   3. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
2. In the laboratory were analyzed:
   1. the softness of the water;
   2. the acidity of the water;
   3. the alkalinity of the water;
   4. the concentration of the water;
   
   
3. EDTA is used:
   1. for complexing of Na¹⁺ and K¹⁺ ions;
   2. as reagent for determining the hardness of the water;
   3. for complexing of Ca²⁺ and Mg²⁺ ions;
   4. for recharging of the resin for water softening;
   
   
4. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + HO^- -> H₂O + Cl^-
   2. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   3. HCl + CO₃^2- -> HCO₃^- + Cl^-
   4. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   
   
5. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   2. NaOH + Cl⁺ -> NaCl + HO⁺
   3. NaOH + Cl^- -> NaCl + HO^-
   4. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   3. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   5. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   
   
2. Īn laborator au fost analizate:
   1. moliciunea apei;
   2. aciditatea apei;
   3. alcalinitatea apei;
   4. concentratia apei;
   5. temperatura apei;
   
   
3. EDTA este utilizat:
   1. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   2. ca reactiv pentru determinarea duritatii apei;
   3. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   4. pentru reīncarcarea rasinii la dedurizarea apei;
   5. ca masura de siguranta;
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + HO^- -> H₂O+Cl^-
   2. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   3. HCl + CO₃^2- -> HCO₃^- + Cl^-
   4. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   2. NaOH + Cl⁺ -> NaCl + HO⁺
   3. NaOH + Cl^- -> NaCl + HO^-
   4. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   
   

FINAL TEST AT LABORATORY
Water analysis

1. We may say the followings:
   1. natural water may contain organic matter and living organisms;
   2. water is good for drinking, it is nothing to be analysed;
   3. purification of the water may include labeling processes;
   4. purification of the water may include physical processes;
   
   
2. For a water sample following measures may be quantitatively expressed:
   1. total alkalinity;
   2. color;
   3. total acidity;
   4. hardness;
   
   
3. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   2. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
4. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + CO₃^2- -> HCO₃^- + Cl^-
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   
   
5. In the laboratory the water were:
   1. alkalinized for drinking purposes;
   2. biologically purified using the resin column;
   3. softened using the resin column;
   4. hardened using the resin column;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Putem spune urmatoarele:
   1. apa naturala poate contine materie organica si organisme vii;
   2. apa este buna pentru consum, nu este nimic de a fi analizat;
   3. purificarea apei poate include procesele de etichetare;
   4. purificarea apei poate include procedee fizice;
   5. purificarea apei poate include procese chimice;
   
   
2. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. alcalinitate totala;
   2. culoare;
   3. aciditate totala;
   4. duritate;
   5. aciditate minerala;
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   2. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + HO⁺ -> H₂O + Cl⁺
   2. HCl + CO₃^2- -> HCO₃^- + Cl^-
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   5. HCl + HO^- -> H₂O+Cl^-
   
   
5. In laborator apa au fost:
   1. alcalinizeaza pentru baut;
   2. purificata biologic utilizānd coloana de rasina;
   3. dedurizata folosind coloana de rasina;
   4. calita folosind coloana de rasina;
   5. acidulata pentru baut;
   
   

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

1. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an anion;
   2. when a gas is released its volume depends on the amount of metal corroded;
   3. a gas is released at both corrosion of zinc and aluminum;
   4. always the metal changes its oxidation state;
   
   
2. Corrosion of metals:
   1. can be reduced by passivation;
   2. can be reduced by electroplating;
   3. is the protection in time to chemical agents;
   4. is a beneficial process that shows the stability of metals;
   
   
3. The aluminum plate:
   1. the surface is measured before and after immersing it in NaOH;
   2. the volume 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. was corroded in sodium hydroxide solution;
   
   
4. Which of the following reactions may be called as of corrosion:
   1. H⁺ + Ni -> H₂ + Ni²⁺
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
5. The zinc plate:
   1. was involved in the volumetric method of corrosion analysis
   2. the volume is measured before and after immersing it in H₂SO₄;
   3. was corroded in sulfuric solution;
   4. was involved in the gravimetric method of corrosion analysis
   
   

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

1. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un anion;
   2. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   3. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   4. īntotdeauna metalul isi schimba starea de oxidare;
   5. metalul isi schimba starea de oxidare pentru a deveni un cation;
   
   
2. Coroziunea metalelor:
   1. poate fi redusa prin pasivare;
   2. poate fi redusa prin galvanizare;
   3. este protectia de durata impotriva agentilor chimici;
   4. este un proces benefic care arata stabilitatea metalelor;
   
   
3. Pentru placa de aluminiu:
   1. suprafata se masoara īnainte si dupa imersia īn NaOH;
   2. volumul se masoara īnainte si dupa imersia īn NaOH;
   3. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   4. a fost corodata īn solutie de hidroxid de sodiu;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H⁺ + Ni -> H₂ + Ni²⁺
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
5. Pentru placa de zinc:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   3. a fost corodata īn solutie sulfuric;
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   5. a fost degresata īn solutie de acid sulfuric;
   
   

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

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

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

1. Coroziunea metalelor:
   1. poate fi redusa prin pasivare;
   2. poate fi redusa prin galvanizare;
   3. este protectia de durata impotriva agentilor chimici;
   4. poate furniza materii prime utile pentru analiza;
   5. este distrugerea metalelor sub actiunea factorilor externi;
   
   
2. Īn procesele de coroziune studiate:
   1. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   2. īntotdeauna metalul isi schimba starea de oxidare;
   3. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   4. un gaz este eliberat numai la corodarea zincului;
   
   
3. Pentru placa de zinc:
   1. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   2. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   3. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   4. a fost degresata īn solutie de acid sulfuric;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H⁺ + Zn -> H₂ + Zn²⁺
   2. Ni(CO)₄ -> Ni + CO
   3. ZnO + CO -> Zn + CO₂
   4. H⁺ + Ni -> H₂ + Ni²⁺
   5. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   
   
5. Pentru placa de aluminiu:
   1. volumul se masoara īnainte si dupa imersia īn NaOH;
   2. suprafata se masoara īnainte si dupa imersia īn NaOH;
   3. masa este masurata īnainte si dupa imersia īn NaOH;
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   
   

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

1. Corrosion of metals:
   1. is the protection in time to chemical agents;
   2. takes place merely from exposure to moisture in air;
   3. is the destruction of metals under the action of external factors;
   4. can be reduced by electroplating;
   
   
2. The aluminum plate:
   1. was involved in the volumetric method of corrosion analysis
   2. was involved in the gravimetric method of corrosion analysis
   3. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   4. was degreased in sodium hydroxide solution;
   
   
3. In studied corrosion processes:
   1. a gas is released at both corrosion of zinc and aluminum;
   2. always the metal changes its oxidation state;
   3. the metal it changes its oxidation state becoming an cation;
   4. when a gas is released its volume depends on the amount of metal corroded;
   
   
4. Which of the following reactions may be called as of corrosion:
   1. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   4. H⁺ + Ni -> H₂ + Ni²⁺
   
   
5. The zinc plate:
   1. was degreased in sulfuric acid solution;
   2. was corroded in sulfuric solution;
   3. the mass is measured before and after immersing it in H₂SO₄;
   4. was involved in the gravimetric method of corrosion analysis
   
   

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

1. Coroziunea metalelor:
   1. este protectia de durata impotriva agentilor chimici;
   2. are loc pur si simplu prin expunerea la umiditate īn aer;
   3. este distrugerea metalelor sub actiunea factorilor externi;
   4. poate fi redusa prin galvanizare;
   5. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   
   
2. Pentru placa de aluminiu:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   4. a fost degresata īn solutie de hidroxid de sodiu;
   5. masa este masurata īnainte si dupa imersia īn NaOH;
   
   
3. Īn procesele de coroziune studiate:
   1. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   2. īntotdeauna metalul isi schimba starea de oxidare;
   3. metalul isi schimba starea de oxidare pentru a deveni un cation;
   4. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   4. H⁺ + Ni -> H₂ + Ni²⁺
   
   
5. Pentru placa de zinc:
   1. a fost degresata īn solutie de acid sulfuric;
   2. a fost corodata īn solutie sulfuric;
   3. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   
   

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

1. Which of the following reactions may be called as of corrosion:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. Ni(CO)₄ -> Ni + CO
   4. H⁺ + Ni -> H₂ + Ni²⁺
   
   
2. In studied corrosion processes:
   1. a gas is released only the corrosion of zinc;
   2. a gas is released at both corrosion of zinc and aluminum;
   3. the metal it changes its oxidation state becoming an anion;
   4. a gas is released only the corrosion of aluminum;
   
   
3. 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 gravimetric method of corrosion analysis
   
   
4. Corrosion of metals:
   1. is the protection in time to chemical agents;
   2. is the destruction of metals under the action of external factors;
   3. takes place merely from exposure to moisture in air;
   4. may provide useful raw materials for analysis;
   
   
5. The aluminum plate:
   1. was involved in the volumetric method of corrosion analysis
   2. the volume is measured before and after immersing it in NaOH;
   3. was corroded in sodium hydroxide solution;
   4. the surface is measured before and after immersing it in NaOH;
   
   

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

1. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. Ni(CO)₄ -> Ni + CO
   4. H⁺ + Ni -> H₂ + Ni²⁺
   5. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
2. Īn procesele de coroziune studiate:
   1. un gaz este eliberat numai la corodarea zincului;
   2. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   3. metalul isi schimba starea de oxidare pentru a deveni un anion;
   4. un gaz este eliberat numai la corodarea aluminiului;
   
   
3. 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 gravimetrica de analiza a coroziunii
   5. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   
   
4. Coroziunea metalelor:
   1. este protectia de durata impotriva agentilor chimici;
   2. este distrugerea metalelor sub actiunea factorilor externi;
   3. are loc pur si simplu prin expunerea la umiditate īn aer;
   4. poate furniza materii prime utile pentru analiza;
   5. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   
   
5. Pentru placa de aluminiu:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. volumul se masoara īnainte si dupa imersia īn NaOH;
   3. a fost corodata īn solutie de hidroxid de sodiu;
   4. suprafata se masoara īnainte si dupa imersia īn NaOH;
   5. a fost degresata īn solutie de hidroxid de sodiu;
   
   

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

1. Corrosion of metals:
   1. is the destruction of metals under the action of external factors;
   2. is a beneficial process that shows the stability of metals;
   3. can be reduced by electroplating;
   4. can be reduced by passivation;
   
   
2. The zinc plate:
   1. was involved in the volumetric method of corrosion analysis
   2. the mass is measured before and after immersing it in H₂SO₄;
   3. was involved in the gravimetric method of corrosion analysis
   4. was degreased in sulfuric acid solution;
   
   
3. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an anion;
   2. the metal it changes its oxidation state becoming an cation;
   3. a gas is released only the corrosion of zinc;
   4. always the metal changes its oxidation state;
   
   
4. Which of the following reactions may be called as of corrosion:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. H⁺ + Ni -> H₂ + Ni²⁺
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. H⁺ + Fe -> H₂ + Fe²⁺
   
   
5. The aluminum plate:
   1. the volume is measured before and after immersing it in NaOH;
   2. the surface 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. Coroziunea metalelor:
   1. este distrugerea metalelor sub actiunea factorilor externi;
   2. este un proces benefic care arata stabilitatea metalelor;
   3. poate fi redusa prin galvanizare;
   4. poate fi redusa prin pasivare;
   5. este protectia de durata impotriva agentilor chimici;
   
   
2. Pentru placa de zinc:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   3. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   4. a fost degresata īn solutie de acid sulfuric;
   
   
3. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un anion;
   2. metalul isi schimba starea de oxidare pentru a deveni un cation;
   3. un gaz este eliberat numai la corodarea zincului;
   4. īntotdeauna metalul isi schimba starea de oxidare;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Fe₂O₃ + CO -> Fe + CO₂
   2. H⁺ + Ni -> H₂ + Ni²⁺
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. H⁺ + Fe -> H₂ + Fe²⁺
   
   
5. Pentru placa de aluminiu:
   1. volumul se masoara īnainte si dupa imersia īn NaOH;
   2. suprafata se masoara īnainte si dupa imersia īn NaOH;
   3. a fost degresata īn solutie de hidroxid de sodiu;
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   5. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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