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

1. The time to the formation of the ring in the experiment is dependent on:
   1. the propagation of the species as neutral molecules and not as ions;
   2. the length of the tube and not of the width of the tube;
   3. the real speeds and not the virtual speeds of each involved species;
   4. the virtual speeds and not the real speeds of each involved species;
   
   
2. We may say the followings:
   1. the molecules have energy in all gaseous, liquid and solid states;
   2. the kinetic energy of a molecule is affected by temperature and pressure;
   3. the molecules have energy only in gaseous state;
   4. the kinetic energy of a molecule is affected by temperature, pressure and size of the molecule;
   
   
3. The chronometer is used in the experiment for:
   1. extracting the information necessary to calculate the diffusion coefficients;
   2. synchronization of the diffusion times;
   3. extracting the information necessary to calculate the speeds ratio;
   4. to keep us busy;
   
   
4. At the ends of the tube following equilibrium reactions occurs:
   1. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   2. H⁺ + HO^- \=\ H₂O
   3. NH₄⁺ + Cl^- \=\ NH₄Cl
   4. H₂O \=\ H⁺ + HO^-
   
   
5. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all are moving in the same direction;
   2. all have same energy;
   3. all have same speed;
   4. are considered to be at the same temperature, but may have different energies;
   
   

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

1. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   2. lungimea tubului si nu latimea tubului;
   3. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   4. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   
   
2. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. moleculele au energie īn toate starile gazoasa, lichida si solida;
   2. energia cinetica a unei molecule este afectata de temperatura si presiune;
   3. moleculele au energie numai īn stare gazoasa;
   4. energia cinetica a unei molecule este afectata de temperatura, presiune si dimensiunea moleculei;
   
   
3. Cronometrul este utilizat īn experimentul pentru:
   1. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   2. sincronizarea timpilor de difuzie;
   3. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   4. sa ne tina ocupati;
   
   
4. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   2. H⁺ + HO^- \=\ H₂O
   3. NH₄⁺ + Cl^- \=\ NH₄Cl
   4. H₂O \=\ H⁺ + HO^-
   5. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   
5. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate se deplaseaza īn aceeasi directie;
   2. toate au aceeasi energie;
   3. toate au aceeasi viteza;
   4. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   5. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   
   

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

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

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

1. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H⁺ + HO^- \=\ H₂O
   2. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   3. NH₄⁺ + Cl^- \=\ NH₄Cl
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   
2. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. energia cinetica a unei molecule este afectata de numai temperatura;
   2. moleculele au energie numai īn stare gazoasa si lichida;
   3. energia cinetica a unei molecule este afectata de temperatura si presiune;
   4. proces de difuzie apare numai īn stare gazoasa;
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   2. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   3. concentratiile solutiilor utilizate;
   4. latimea tubului si nu lungimea tubului;
   5. lungimea tubului si latimea tubului;
   
   
4. Cronometrul este utilizat īn experimentul pentru:
   1. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   2. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   3. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   4. sincronizarea timpilor de difuzie;
   
   
5. Pozitia inelului īn experimentul este dependenta de:
   1. concentratiile solutiilor utilizate;
   2. latimea tubului si nu lungimea tubului;
   3. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   4. energia medie sau viteza medie a fiecarei specii implicate;
   
   

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

1. The time to the formation of the ring in the experiment is dependent on:
   1. the width of the tube and not of the length of the tube;
   2. the real speeds and not the virtual speeds of each involved species;
   3. the speed of diffusion of each involved species;
   4. the mode energy or mode speed of each involved species;
   
   
2. The chronometer is used in the experiment for:
   1. extracting the information necessary to calculate the diffusion coefficients;
   2. synchronization of the diffusion times;
   3. indication of the moment when we should pay attention to the experiment;
   4. extracting the information necessary to calculate the speeds ratio;
   
   
3. 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 length of the tube and not of the width of the tube;
   3. the propagation of the species as ions and not as neutral molecules;
   4. the concentrations of the solutions used;
   
   
4. The fog observed during the experiment is due to:
   1. unproper illumination in the laboratory and our breathing;
   2. our experiment designed to trap the product of the reaction;
   3. unproper illumination in the laboratory or our breathing;
   4. presence of the chlorine;
   
   
5. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all are moving in the same direction;
   2. are considered to be at the same temperature, but may have different speeds;
   3. all have same energy;
   4. are considered to be at the same temperature, but may have different energies;
   
   

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

1. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. latimea tubului si nu lungimea tubului;
   2. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   3. viteza de difuzie a fiecarei specii implicate;
   4. viteza la moda sau energia la moda a fiecarei specii implicate;
   
   
2. Cronometrul este utilizat īn experimentul pentru:
   1. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   2. sincronizarea timpilor de difuzie;
   3. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   4. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   
   
3. Pozitia inelului īn experimentul este dependenta de:
   1. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   2. lungimea tubului si nu latimea tubului;
   3. propagarea speciilor ca ionii si nu ca si molecule neutre;
   4. concentratiile solutiilor utilizate;
   
   
4. Ceata observata īn timpul experimentului se datoreaza:
   1. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   2. experimentului nostru proiectat pentru a captura produsul de reactie;
   3. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   4. prezentei clorului;
   5. prezentei amoniacului;
   
   
5. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate se deplaseaza īn aceeasi directie;
   2. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   3. toate au aceeasi energie;
   4. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   5. toate au aceeasi viteza;
   
   

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

1. The fog observed during the experiment is due to:
   1. formation of ammonium chloride;
   2. our experiment designed to trap the product of the reaction;
   3. presence of the ammonia;
   4. presence of the chlorine;
   
   
2. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. are considered to be at the same temperature, but may have different speeds;
   2. all have same energy;
   3. all have same speed;
   4. all are moving in an arbitrary direction;
   
   
3. We may say the followings:
   1. the molecules have speeds in all gaseous, liquid and solid states;
   2. the molecules have energy in all gaseous, liquid and solid states;
   3. diffusion process appears only in gaseous and liquid states;
   4. the molecules have energy only in gaseous and liquid states;
   
   
4. At the ends of the tube following equilibrium reactions occurs:
   1. H⁺ + HO^- \=\ H₂O
   2. NH₃ + HCl \=\ NH₄Cl
   3. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   4. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
5. The position of the ring in the experiment is dependent on:
   1. the average energy or average speed of each involved species;
   2. the mode energy or mode speed of each involved species;
   3. the length of the tube and not of the width of the tube;
   4. the propagation of the species as neutral molecules and not as ions;
   
   

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

1. Ceata observata īn timpul experimentului se datoreaza:
   1. formarea clorurii de amoniu;
   2. experimentului nostru proiectat pentru a captura produsul de reactie;
   3. prezentei amoniacului;
   4. prezentei clorului;
   
   
2. 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 au aceeasi viteza;
   4. toate se īndreapta īntr-o directie arbitrara;
   5. toate se deplaseaza īn aceeasi directie;
   
   
3. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. moleculele au viteze īn toate starile gazoasa, lichida si solida;
   2. moleculele au energie īn toate starile gazoasa, lichida si solida;
   3. proces de difuzie apare numai īn stare gazoasa si lichida;
   4. moleculele au energie numai īn stare gazoasa si lichida;
   
   
4. La capetele tubului urmatoarele reactii de echilibru apar:
   1. H⁺ + HO^- \=\ H₂O
   2. NH₃ + HCl \=\ NH₄Cl
   3. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   4. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
5. Pozitia inelului īn experimentul este dependenta de:
   1. energia medie sau viteza medie a fiecarei specii implicate;
   2. viteza la moda sau energia la moda a fiecarei specii implicate;
   3. lungimea tubului si nu latimea tubului;
   4. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   
   

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

1. The chronometer is used in the experiment for:
   1. measuring of the diffusion time;
   2. to keep us busy;
   3. indication of the moment when we should pay attention to the experiment;
   4. extracting the information necessary to calculate the diffusion coefficients;
   
   
2. At the ends of the tube following equilibrium reactions occurs:
   1. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   2. H₂O \=\ H⁺ + HO^-
   3. H⁺ + HO^- \=\ H₂O
   4. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
3. The position of the ring in the experiment is dependent on:
   1. the speed of diffusion of each involved species;
   2. the mode energy or mode speed of each involved species;
   3. the average energy or average speed of each involved species;
   4. the length of the tube and the width of the tube;
   
   
4. 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. are considered to be at the same temperature, but may have different energies;
   3. all are moving in the same direction;
   4. all have same energy;
   
   
5. The fog observed during the experiment is due to:
   1. unproper illumination in the laboratory or our breathing;
   2. formation of ammonium chloride;
   3. unproper illumination in the laboratory and our breathing;
   4. presence of the chlorine;
   
   

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

1. Cronometrul este utilizat īn experimentul pentru:
   1. masurarea timpului de difuzie;
   2. sa ne tina ocupati;
   3. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   4. extragerea informatiilor necesare pentru a calcula coeficientii de difuzie;
   5. sincronizarea timpilor de difuzie;
   
   
2. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   2. H₂O \=\ H⁺ + HO^-
   3. H⁺ + HO^- \=\ H₂O
   4. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
3. Pozitia inelului īn experimentul este dependenta de:
   1. viteza de difuzie a fiecarei specii implicate;
   2. viteza la moda sau energia la moda a fiecarei specii implicate;
   3. energia medie sau viteza medie a fiecarei specii implicate;
   4. lungimea tubului si latimea tubului;
   5. propagarea speciilor ca ionii si nu ca si molecule neutre;
   
   
4. 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. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   3. toate se deplaseaza īn aceeasi directie;
   4. toate au aceeasi energie;
   
   
5. Ceata observata īn timpul experimentului se datoreaza:
   1. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   2. formarea clorurii de amoniu;
   3. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   4. prezentei clorului;
   
   

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

1. In the laboratory were studied:
   1. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   2. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   3. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   4. increasing of the pressure of a gas when was heated;
   
   
2. A state equation for a real gas is:
   1. a relation between an certain number of state parameters;
   2. a relation obtained after conducting of the experiment;
   3. a relation between an unlimited number of state parameters;
   4. a relation which is always true, independent of the values of the state parameters;
   
   
3. The values taken from the experiment conducted in the laboratory indicated that:
   1. the ideal model of a gas approximated the worst the behavior of the released gas;
   2. we do not possess enough information to decide what gas was released from the reaction;
   3. air were released as result of the decomposition;
   4. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   
   
4. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. H₂O + O₂ -> H₂O₂;
   2. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   3. opening a bubble water bottle;
   4. Ag₂O -> Ag + O₂;
   
   
5. For gaseous state:
   1. the pressure is exactly the same as in liquid state;
   2. the pressure depends on the model which are used to approximate it;
   3. we need to take supplementary precautions in the laboratory;
   4. the pressure is much lower than in liquid state;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Īn laborator s-au studiat:
   1. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   2. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   3. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   4. cresterea presiunii unui gaz cānd s-a īncalzit;
   5. pierdut din masa de solid ca urmare a producerii unor gaze;
   
   
2. O ecuatie de stare pentru un gaz real este:
   1. o relatie īntre un anumit numar de parametri de stare;
   2. o relatie obtinut dupa efectuarea experimentului;
   3. o relatie īntre un numar nelimitat de parametri de stare;
   4. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   5. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   
   
3. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   2. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   3. aer a fost eliberat ca urmare a descompunerii;
   4. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   5. ozonul au fost eliberat ca urmare a descompunerii;
   
   
4. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. H₂O + O₂ -> H₂O₂;
   2. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   3. deschiderea unei sticle de apa cu bule;
   4. Ag₂O -> Ag + O₂;
   
   
5. Pentru stare gazoasa:
   1. presiunea este exact la fel ca si īn stare lichida;
   2. presiunea depinde de modelul care este utilizat pentru o aproxima;
   3. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   4. presiunea este mult mai mica decāt īn stare lichida;
   
   

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

1. For gaseous state:
   1. the pressure is exactly the same as in liquid state;
   2. it exists an equation for all, p · V = n · R · T;
   3. the pressure is subject to change when a chemical reaction occurs;
   4. the pressure is unchanged when a chemical reaction occurs;
   
   
2. The values taken from the experiment conducted in the laboratory indicated that:
   1. we possess enough information to decide what gas was released from the reaction;
   2. the ideal model of a gas approximated the worst the behavior of the released gas;
   3. as more complex 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. Ag₂O -> Ag + O₂;
   2. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   3. KNO₂ + O₂ -> KNO₃;
   4. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   
   
4. A state equation for a real gas is:
   1. a relation derived to approximate the relation between state parameters;
   2. a relation between an certain number of state parameters;
   3. a relation which is always true, independent of the values of the state parameters;
   4. a relation which may involve some constants dependent of gas composition;
   
   
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 + O₃;
   3. the producing of some gas as result of a lost of the mass of a solid;
   4. increasing of the temperature of a solid mass when was heated;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pentru stare gazoasa:
   1. presiunea este exact la fel ca si īn stare lichida;
   2. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   3. presiunea se pot modifica atunci cānd apare o reactie chimica;
   4. presiunea este neschimbata cānd apare o reactie chimica;
   5. presiunea este aproximativ aceeasi ca si īn stare lichida;
   
   
2. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   2. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   3. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   4. ozonul au fost eliberat ca urmare a descompunerii;
   5. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   
3. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. Ag₂O -> Ag + O₂;
   2. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   3. KNO₂ + O₂ -> KNO₃;
   4. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   5. KClO₃ -> KCl + O₂;
   
   
4. O ecuatie de stare pentru un gaz real este:
   1. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   2. o relatie īntre un anumit numar de parametri de stare;
   3. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   4. o relatie care poate implica unele constante dependente de compozitia gazului;
   5. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   
   
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 + O₃;
   3. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   4. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   
   

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

1. For gaseous state:
   1. the pressure depends on the model which are used to approximate it;
   2. the pressure is unchanged when a chemical reaction occurs;
   3. the pressure is much lower than in liquid state;
   4. the pressure is subject to change when a chemical reaction occurs;
   
   
2. A state equation for a real gas is:
   1. a relation which is always true, independent of the values of the state parameters;
   2. a relation between an certain number of state parameters;
   3. a relation which takes into account certain deviations from the ideal model;
   4. a relation obtained after conducting of the experiment;
   
   
3. 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. the ideal model of a gas approximated the best the behavior of the released gas;
   3. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   4. air were released as result of the decomposition;
   
   
4. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. KClO₃ -> KCl + O₂;
   2. Ag₂O -> Ag + O₂;
   3. Ag + O₂ -> Ag₂O;
   4. H₂O₂ -> H₂O + O₂;
   
   
5. In the laboratory were studied:
   1. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   2. the producing of some gas as result of a lost of the mass of a solid;
   3. increasing of the temperature of a solid mass when was heated;
   4. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pentru stare gazoasa:
   1. presiunea depinde de modelul care este utilizat pentru o aproxima;
   2. presiunea este neschimbata cānd apare o reactie chimica;
   3. presiunea este mult mai mica decāt īn stare lichida;
   4. presiunea se pot modifica atunci cānd apare o reactie chimica;
   
   
2. O ecuatie de stare pentru un gaz real este:
   1. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   2. o relatie īntre un anumit numar de parametri de stare;
   3. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   4. o relatie obtinut dupa efectuarea experimentului;
   5. o relatie care poate implica unele constante dependente de compozitia gazului;
   
   
3. 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. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   3. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   4. aer a fost eliberat ca urmare a descompunerii;
   5. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   
4. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. KClO₃ -> KCl + O₂;
   2. Ag₂O -> Ag + O₂;
   3. Ag + O₂ -> Ag₂O;
   4. H₂O₂ -> H₂O + O₂;
   5. distilarea aerului lichid;
   
   
5. Īn laborator s-au studiat:
   1. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   2. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   3. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   4. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   
   

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

1. A state equation for a real gas is:
   1. a relation between an certain number of state parameters;
   2. a relation derived to approximate the relation between state parameters;
   3. a relation which may involve some constants dependent of gas composition;
   4. a relation which takes into account certain deviations from the ideal model;
   
   
2. The values taken from the experiment conducted in the laboratory indicated that:
   1. ozone were released as result of the decomposition;
   2. air were released as result of the decomposition;
   3. the ideal model of a gas approximated the best the behavior of the released gas;
   4. we do not possess enough information to decide what gas was released from the reaction;
   
   
3. In the laboratory were studied:
   1. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   2. increasing of the temperature of a solid mass when was heated;
   3. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   4. the lost of the mass of a solid as result of producing of some gas;
   
   
4. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. distillation of the liquid air;
   2. H₂O₂ -> H₂O + O₂;
   3. Ag₂O -> Ag + O₂;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   
5. For gaseous state:
   1. the pressure is subject to change when a chemical reaction occurs;
   2. the pressure is approximately the same as in liquid state;
   3. the pressure depends on the model which are used to approximate it;
   4. the pressure is much higher than in liquid state;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. O ecuatie de stare pentru un gaz real este:
   1. o relatie īntre un anumit numar de parametri de stare;
   2. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   3. o relatie care poate implica unele constante dependente de compozitia gazului;
   4. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   5. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   
   
2. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. ozonul au fost eliberat ca urmare a descompunerii;
   2. aer a fost eliberat ca urmare a descompunerii;
   3. modelul ideal al unui gaz aproximeaza cel mai bine comportamentul gazului eliberat;
   4. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   
3. Īn laborator s-au studiat:
   1. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   2. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   3. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   4. pierdut din masa de solid ca urmare a producerii unor gaze;
   
   
4. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. distilarea aerului lichid;
   2. H₂O₂ -> H₂O + O₂;
   3. Ag₂O -> Ag + O₂;
   4. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   5. KCl + O₂ -> KClO₃;
   
   
5. Pentru stare gazoasa:
   1. presiunea se pot modifica atunci cānd apare o reactie chimica;
   2. presiunea este aproximativ aceeasi ca si īn stare lichida;
   3. presiunea depinde de modelul care este utilizat pentru o aproxima;
   4. presiunea este mult mai mare decāt īn stare lichida;
   
   

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

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

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. oxigenul au fost eliberat ca urmare a descompunerii;
   2. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   3. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   4. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   
2. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. H₂O + O₂ -> H₂O₂;
   2. H₂O₂ -> H₂O + O₂;
   3. KNO₃ -> KNO₂ + O₂;
   4. distilarea aerului lichid;
   5. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   
   
3. Pentru stare gazoasa:
   1. presiunea este neschimbata cānd apare o reactie chimica;
   2. presiunea depinde de modelul care este utilizat pentru o aproxima;
   3. presiunea este aproximativ aceeasi ca si īn stare lichida;
   4. presiunea este mult mai mica decāt īn stare lichida;
   
   
4. Īn laborator s-au studiat:
   1. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   2. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   3. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   4. pierdut din masa de solid ca urmare a producerii unor gaze;
   5. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   
   
5. O ecuatie de stare pentru un gaz real este:
   1. o relatie obtinut dupa efectuarea experimentului;
   2. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   3. o relatie īntre un anumit numar de parametri de stare;
   4. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. This method of analysis of metals and alloys is:
   1. not useful for both metals and alloys;
   2. useful for pure metals, not so useful for alloys;
   3. a nondestructive method of analysis;
   4. a quantitative method of analysis;
   
   
2. Why moisten the paper with solution of sodium nitrate?
   1. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   2. to provide cations for analysis;
   3. to accomodate ourselves to use chemicals;
   4. for stopping after a while the chemical reaction that takes place;
   
   
3. When aluminum is identified:
   1. the presence of other ions may produce a true negative outcome;
   2. using of alizarin along with ammonium hidroxide provide a red colored complex;
   3. is identified as Al¹⁺ cation;
   4. there are many identification reactions possible;
   
   
4. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   
5. When the electrical circuit is closed:
   1. anions from the solution are passed into sample as metals;
   2. elements from the metals are passed into solution as anions;
   3. electric current passes the sample and the paper;
   4. water dissociation is inhibited;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Aceasta metoda de analiza de metale si aliaje este:
   1. nu este utila nici pentru metale nici pentru aliaje;
   2. utila pentru metale pure, nu atāt de utila pentru aliaje;
   3. o metoda nedistructiva de analiza;
   4. o metoda cantitativa de analiza;
   5. prea veche pentru a fi utilizata īn prezent īn laborator;
   
   
2. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   2. pentru furniza cationi pentru analiza;
   3. sa ne acomodam in a utiliza substante chimice;
   4. pentru oprirea dupa un timp reactiei chimice care are loc;
   
   
3. Cānd aluminiu este identificat:
   1. prezenta altor ioni poate produce un rezultat adevarat negativ;
   2. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un complex colorat rosu;
   3. este identificat ca cationul Al¹⁺;
   4. exista multe reactii posibile de identificare;
   
   
4. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   2. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   5. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
5. Cānd circuitul electric este īnchis:
   1. anionii din solutie sunt trecuti īn proba ca metale;
   2. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   3. curent electric trece prin proba si hārtie;
   4. disocierea apei este inhibata;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. This method of analysis of metals and alloys is:
   1. useful for both metals and alloys;
   2. a destructive method of analysis;
   3. a gravimetric method of analysis;
   4. too ancient to be used today in the laboratory;
   
   
2. The paper requires before analysis of the sample:
   1. to measure its surface;
   2. to be burned;
   3. to be moistened with an electrolyte;
   4. to be tested;
   
   
3. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   4. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   
   
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 have something to do in the laboratory;
   3. for the paper to work as isolator;
   4. to provide cations for analysis;
   
   
5. When the electrical circuit is closed:
   1. elements from the solution are passed into sample as metals;
   2. electric current passes the sample and the paper;
   3. electric current avoids the sample and the paper;
   4. surface of the sample is fastly covered by a protecting shield of electrons;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Aceasta metoda de analiza de metale si aliaje este:
   1. utila atāt pentru metale si aliaje;
   2. o metoda distructiva de analiza;
   3. o metoda gravimetrica de analiza;
   4. prea veche pentru a fi utilizata īn prezent īn laborator;
   5. o metoda cantitativa de analiza;
   
   
2. Hartia necesita ca īnainte de analiza probei:
   1. sa i se masoare suprafata;
   2. sa fie arsa;
   3. sa fie umezita cu un electrolit;
   4. sa fie testata;
   5. sa fie uscata;
   
   
3. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   4. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   5. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   
   
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. pentru a avea ceva de a face īn laborator;
   3. pentru ca hartia sa actioneze ca izolator;
   4. pentru furniza cationi pentru analiza;
   5. sa ne acomodam in a utiliza substante chimice;
   
   
5. Cānd circuitul electric este īnchis:
   1. elemente din solutie sunt trecute īn proba ca metale;
   2. curent electric trece prin proba si hārtie;
   3. curent electric evita proba si hārtia;
   4. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When lead is identified:
   1. a yellow complex appears;
   2. interference of other ions may affect the outcome;
   3. dangerous substances are used;
   4. a red-brown complex appears;
   
   
2. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   2. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
3. Why moisten the paper with solution of sodium nitrate?
   1. to be cut easily with scissors;
   2. for the paper to work as isolator;
   3. for stopping after a while the chemical reaction that takes place;
   4. to provide cations for analysis;
   
   
4. The paper requires before analysis of the sample:
   1. to be dry;
   2. to be burned;
   3. to measure its surface;
   4. to be tested;
   
   
5. This method of analysis of metals and alloys is:
   1. a destructive method of analysis;
   2. a gravimetric method of analysis;
   3. too ancient to be used today in the laboratory;
   4. a nondestructive method of analysis;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd plumbul este identificat:
   1. apare un complex galben;
   2. interferenta altor ioni poate afecta rezultatul;
   3. sunt utilizate substante periculoase;
   4. apare un complex rosu-brun;
   5. se observa o eliberare de caldura;
   
   
2. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   2. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   5. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   
   
3. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. sa fie taiat cu usurinta cu foarfeca;
   2. pentru ca hartia sa actioneze ca izolator;
   3. pentru oprirea dupa un timp reactiei chimice care are loc;
   4. pentru furniza cationi pentru analiza;
   5. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   
   
4. Hartia necesita ca īnainte de analiza probei:
   1. sa fie uscata;
   2. sa fie arsa;
   3. sa i se masoare suprafata;
   4. sa fie testata;
   5. sa fie acidulata;
   
   
5. Aceasta metoda de analiza de metale si aliaje este:
   1. o metoda distructiva de analiza;
   2. o metoda gravimetrica de analiza;
   3. prea veche pentru a fi utilizata īn prezent īn laborator;
   4. o metoda nedistructiva de analiza;
   5. o metoda cantitativa de analiza;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When the electrical circuit is closed:
   1. surface of the sample is fastly covered by a protecting shield of electrons;
   2. elements from the metals are passed into solution as cations;
   3. water dissociation is inhibited;
   4. elements from the solution are passed into sample as metals;
   
   
2. This method of analysis of metals and alloys is:
   1. a quantitative method of analysis;
   2. not useful for both metals and alloys;
   3. a gravimetric method of analysis;
   4. a destructive method of analysis;
   
   
3. When aluminum is identified:
   1. using of alizarin along with ammonium hidroxide provide a red colored complex;
   2. the presence of other ions may produce a true positive outcome;
   3. the presence of other ions may produce a true negative outcome;
   4. the presence of other ions may produce a false positive outcome;
   
   
4. When lead is identified:
   1. precautions should be made for toxic wastes disposal;
   2. a heat release is observed;
   3. interference of other ions may affect the outcome;
   4. a violet complex appears;
   
   
5. Why moisten the paper with solution of sodium nitrate?
   1. to be cut easily with scissors;
   2. to provide cations for analysis;
   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. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   2. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   3. disocierea apei este inhibata;
   4. elemente din solutie sunt trecute īn proba ca metale;
   5. anionii din solutie sunt trecuti īn proba ca metale;
   
   
2. Aceasta metoda de analiza de metale si aliaje este:
   1. o metoda cantitativa de analiza;
   2. nu este utila nici pentru metale nici pentru aliaje;
   3. o metoda gravimetrica de analiza;
   4. o metoda distructiva de analiza;
   
   
3. Cānd aluminiu este identificat:
   1. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un complex colorat rosu;
   2. prezenta altor ioni poate produce un rezultat adevarat pozitiv;
   3. prezenta altor ioni poate produce un rezultat adevarat negativ;
   4. prezenta altor ioni poate produce un rezultat fals pozitiv;
   5. prezenta altor ioni poate produce un rezultat fals negativ;
   
   
4. Cānd plumbul este identificat:
   1. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   2. se observa o eliberare de caldura;
   3. interferenta altor ioni poate afecta rezultatul;
   4. apare un complex violet;
   
   
5. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. sa fie taiat cu usurinta cu foarfeca;
   2. pentru furniza cationi pentru analiza;
   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. When the electrical circuit is closed:
   1. surface of the sample is fastly covered by a protecting shield of electrons;
   2. elements from the metals are passed into solution as cations;
   3. elements from the metals are passed into solution as anions;
   4. water dissociation is inhibited;
   
   
2. Why moisten the paper with solution of sodium nitrate?
   1. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   2. to have something to do in the laboratory;
   3. for stopping after a while the chemical reaction that takes place;
   4. to accomodate ourselves to use chemicals;
   
   
3. The paper requires before analysis of the sample:
   1. to be tested;
   2. to be cut in small pieces;
   3. to be moistened with an electrolyte;
   4. to be acidified;
   
   
4. This method of analysis of metals and alloys is:
   1. a nondestructive method of analysis;
   2. too ancient to be used today in the laboratory;
   3. a destructive method of analysis;
   4. not useful for both metals and alloys;
   
   
5. The electric charges after passing the metals into solution may be:
   1. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   2. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   3. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd circuitul electric este īnchis:
   1. suprafata probei este cu rapiditate acoperita de un strat protector de electroni;
   2. elementele din metalele sunt trecute īn solutie sub forma de cationi;
   3. elemente din metalele sunt trecute īn solutie sub forma de anioni;
   4. disocierea apei este inhibata;
   5. elemente din solutie sunt trecute īn proba ca metale;
   
   
2. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   2. pentru a avea ceva de a face īn laborator;
   3. pentru oprirea dupa un timp reactiei chimice care are loc;
   4. sa ne acomodam in a utiliza substante chimice;
   5. sa fie taiat cu usurinta cu foarfeca;
   
   
3. Hartia necesita ca īnainte de analiza probei:
   1. sa fie testata;
   2. sa fie taiata īn bucati mici;
   3. sa fie umezita cu un electrolit;
   4. sa fie acidulata;
   5. sa fie cantarita;
   
   
4. Aceasta metoda de analiza de metale si aliaje este:
   1. o metoda nedistructiva de analiza;
   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. utila atāt pentru metale si aliaje;
   
   
5. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   2. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   3. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The equivalence point is:
   1. something rarely encountered in chemistry;
   2. the point in which a reactive is fully consumed in the reaction;
   3. the point in which a reactive should be added in the burette;
   4. used to balance the equation;
   
   
2. A redox process:
   1. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. is considered to be the following one: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. is always fast and safe;
   4. occurs only when we mix wrong substances in the laboratory;
   
   
3. The density of the solutions depends on:
   1. provider;
   2. concentration;
   3. quantity;
   4. temperature;
   
   
4. Reactions between acids and bases:
   1. always have as a consequence the formation of a quantity of water;
   2. are always fast, taking place almost instantaneously;
   3. have as a consequence the dissolution of a salt;
   4. are all exothermic, being therefore dangerous outside of the laboratory;
   
   
5. The indicator should be added:
   1. to indicate our safety limits when we dealt with chemicals;
   2. in small quantities, to avoid the errors in observations and in calculations;
   3. only in special cases, when the burette is graded from its bottom to its top;
   4. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Punctul de echivalenta este:
   1. ceva rar īntālnit īn chimie;
   2. punctul īn care un reactiv este consumat complet īn reactie;
   3. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   4. folosit pentru a echilibra ecuatia;
   
   
2. Un proces redox:
   1. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. este considerat a fi urmatorul: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. este īntotdeauna rapid si sigur;
   4. apare numai atunci cānd se amesteca substante gresit īn laborator;
   
   
3. Densitatea solutiilor depinde de:
   1. furnizor;
   2. concentratie;
   3. cantitate;
   4. temperatura;
   
   
4. Reactiile īntre acizi si baze:
   1. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   2. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   3. au drept consecinta dizolvarea unei sari;
   4. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   5. au ca efect schimbarea culorii unei solutii;
   
   
5. Trebuie adaugat indicatorul:
   1. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   2. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   3. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   4. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   5. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The equivalence point is:
   1. something rarely encountered in chemistry;
   2. indicated when a color change is observed into the solution;
   3. the point in which a reactive is fully consumed in the reaction;
   4. the point in which a reactive should be added in the reaction flask;
   
   
2. When a chemical reaction is balanced, following should be considered:
   1. all glassware should be clean before, after and during the experiment;
   2. the liquid in the burette should be at the same level before and after conducting the experiment;
   3. the principle of the conservation of the volume;
   4. the principle of the conservation of the number of atoms for each element;
   
   
3. The density of the solutions depends on:
   1. temperature;
   2. provider;
   3. time elapsed since were prepared;
   4. pressure;
   
   
4. Reactions between acids and bases:
   1. are always fast, taking place almost instantaneously;
   2. have as effect the change of the color of a solution;
   3. are all exothermic, being therefore dangerous outside of the laboratory;
   4. are rarely useful, and even rarely used;
   
   
5. The indicator should be added:
   1. only in special cases, when the burette is graded from its bottom to its top;
   2. to indicate our safety limits when we dealt with chemicals;
   3. in large quantities, according to the principle 'only size matters';
   4. to provide a color change at equivalence point;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Punctul de echivalenta este:
   1. ceva rar īntālnit īn chimie;
   2. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   3. punctul īn care un reactiv este consumat complet īn reactie;
   4. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   
   
2. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   2. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   3. principiul conservarii volumului;
   4. principiul conservarii numarul de atomi pentru fiecare element;
   5. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   
   
3. Densitatea solutiilor depinde de:
   1. temperatura;
   2. furnizor;
   3. timpul scurs de cand au fost pregatite;
   4. presiune;
   
   
4. Reactiile īntre acizi si baze:
   1. sunt īntotdeauna rapide, avānd loc aproape instantaneu;
   2. au ca efect schimbarea culorii unei solutii;
   3. sunt toate exoterme, fiind, prin urmare, īn afara laboratorului periculoase;
   4. sunt rareori utile, si chiar mai rar utilizate;
   
   
5. Trebuie adaugat indicatorul:
   1. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   2. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   3. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   4. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   5. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The density of the solutions depends on:
   1. temperature;
   2. provider;
   3. quantity;
   4. time elapsed since were prepared;
   
   
2. The following chemical reactions were used in the experiments:
   1. H₂O + CO₂ -> H₂CO₃
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
3. The equivalence point is:
   1. something rarely encountered in chemistry;
   2. the point in which a reactive should be added in the burette;
   3. used to balance the equation;
   4. the point in which a reactive is fully consumed in the reaction;
   
   
4. The indicator should be added:
   1. to indicate our safety limits when we dealt with chemicals;
   2. in large quantities, according to the principle 'only size matters';
   3. only at the suggestion of the supervisor;
   4. in small quantities, to avoid the errors in observations and in calculations;
   
   
5. A redox process:
   1. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. occurs only when we mix wrong substances in the laboratory;
   3. involves changing of the oxidation states of some participants to the reaction;
   4. involves a transfer of electrons from one atom or group of atoms to another;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Densitatea solutiilor depinde de:
   1. temperatura;
   2. furnizor;
   3. cantitate;
   4. timpul scurs de cand au fost pregatite;
   5. concentratie;
   
   
2. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. H₂O + CO₂ -> H₂CO₃
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   4. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   5. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   
   
3. Punctul de echivalenta este:
   1. ceva rar īntālnit īn chimie;
   2. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   3. folosit pentru a echilibra ecuatia;
   4. punctul īn care un reactiv este consumat complet īn reactie;
   5. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   
   
4. Trebuie adaugat indicatorul:
   1. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   2. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   3. numai la sugestia supraveghetorului;
   4. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   5. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   
   
5. Un proces redox:
   1. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. apare numai atunci cānd se amesteca substante gresit īn laborator;
   3. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   4. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   5. implica schimbarea a starilor de agregare ale unor participanti la reactie;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The equivalence point is:
   1. the point in which a reactive should be added in the burette;
   2. used to balance the equation;
   3. the point in which a reactive should be added in the reaction flask;
   4. something rarely encountered in chemistry;
   
   
2. The following chemical reactions were used in the experiments:
   1. H₂O + CO₂ -> H₂CO₃
   2. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   4. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   
3. In the calculations:
   1. are necessary to take the results imediatly after these are available from others;
   2. are necessary to draw the tables in our notebooks after completing of the experiment;
   3. are necessary to use our phones;
   4. are necessary to discuss with our colleagues;
   
   
4. Reactions between acids and bases:
   1. have as effect the change of the color of a solution;
   2. always have as a consequence the formation of a quantity of water;
   3. are rarely useful, and even rarely used;
   4. have as a consequence the dissolution of a salt;
   
   
5. The indicator should be added:
   1. to provide a color change at equivalence point;
   2. in large quantities, according to the principle 'only size matters';
   3. to indicate our safety limits when we dealt with chemicals;
   4. only at the suggestion of the supervisor;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Punctul de echivalenta este:
   1. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   2. folosit pentru a echilibra ecuatia;
   3. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   4. ceva rar īntālnit īn chimie;
   
   
2. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. H₂O + CO₂ -> H₂CO₃
   2. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   4. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   5. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   
   
3. In calcule:
   1. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   2. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   3. este necesar sa utilizam telefoanele;
   4. este necesar sa discutam cu colegii;
   5. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   
   
4. Reactiile īntre acizi si baze:
   1. au ca efect schimbarea culorii unei solutii;
   2. au īntotdeauna drept consecinta formarea unei cantitati de apa;
   3. sunt rareori utile, si chiar mai rar utilizate;
   4. au drept consecinta dizolvarea unei sari;
   
   
5. Trebuie adaugat indicatorul:
   1. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   2. īn cantitati mari, īn conformitate cu principiul "doar dimensiunea conteaza";
   3. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   4. numai la sugestia supraveghetorului;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The equivalence point is:
   1. used to balance the equation;
   2. indicated when a color change is observed into the solution;
   3. the point in which a reactive is fully consumed in the reaction;
   4. something rarely encountered in chemistry;
   
   
2. A redox process:
   1. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. involves changing of the oxidation states of some participants to the reaction;
   3. is considered to be the following one: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. is always fast and safe;
   
   
3. The indicator should be added:
   1. only at the suggestion of the supervisor;
   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. only in special cases, when the burette is graded from its bottom to its top;
   
   
4. Titration as a laboratory operation involves:
   1. a mass measurement;
   2. a pH indicator that changes color depending on the pH of the solution;
   3. a pH-metter;
   4. a volume measurement;
   
   
5. The following chemical reactions were used in the experiments:
   1. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Punctul de echivalenta este:
   1. folosit pentru a echilibra ecuatia;
   2. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   3. punctul īn care un reactiv este consumat complet īn reactie;
   4. ceva rar īntālnit īn chimie;
   5. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   
   
2. Un proces redox:
   1. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. implica schimbarea a starilor de oxidare ale unor participanti la reactie;
   3. este considerat a fi urmatorul: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. este īntotdeauna rapid si sigur;
   
   
3. Trebuie adaugat indicatorul:
   1. numai la sugestia supraveghetorului;
   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. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   
   
4. Titrarea ca o operatiune de laborator implica:
   1. masurarea masei;
   2. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   3. un pH-metru;
   4. masurarea volumului;
   
   
5. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   2. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   3. KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   4. H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   
   

FINAL TEST AT LABORATORY
Water analysis

1. For a water sample following measures may be quantitatively expressed:
   1. total acidity;
   2. hardness;
   3. color;
   4. purity;
   
   
2. In the laboratory the water were:
   1. complexed by using EDTA titrimetric method;
   2. acidified for drinking purposes;
   3. softened using the resin column;
   4. hardened using the resin column;
   
   
3. We may say the followings:
   1. purification of the water may include physical processes;
   2. purification of the water may include chemical processes;
   3. purification of the water may include labeling processes;
   4. water is good for drinking, it is nothing to be analysed;
   
   
4. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   
   
5. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + Cl^- -> NaCl + HO^-
   2. NaOH + NO₃^- -> NaNO₃ + HO^-
   3. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   4. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

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

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   2. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   3. NaOH + NO₃^- -> NaNO₃ + HO^-
   4. NaOH + Cl⁺ -> NaCl + HO⁺
   
   
2. We may say the followings:
   1. water is pure only when is taken from a good freshwater mountain stream;
   2. water is a good polar solvent;
   3. purification of the water may include labeling processes;
   4. when water contains dissolved minerals and gases is bad for drinking;
   
   
3. For a water sample following measures may be quantitatively expressed:
   1. color;
   2. mineral acidity;
   3. total alkalinity;
   4. hardness;
   
   
4. In the laboratory the water were:
   1. softened using the resin column;
   2. biologically purified using the resin column;
   3. acidified for drinking purposes;
   4. alkalinized for drinking purposes;
   
   
5. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   2. NaOH + HCOO⁺ -> HCOONa + HO⁺
   3. NaOH + HCOO^- -> HCOONa + HO^-
   4. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   2. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   3. NaOH + NO₃^- -> NaNO₃ + HO^-
   4. NaOH + Cl⁺ -> NaCl + HO⁺
   5. NaOH + Cl^- -> NaCl + HO^-
   
   
2. Putem spune urmatoarele:
   1. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   2. apa este un solvent polar bun;
   3. purificarea apei poate include procesele de etichetare;
   4. atunci cānd apa contine minerale dizolvate si gaze este rea pentru baut;
   5. purificarea apei poate include procese biologice;
   
   
3. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. culoare;
   2. aciditate minerala;
   3. alcalinitate totala;
   4. duritate;
   5. alcalinitate permanenta;
   
   
4. In laborator apa au fost:
   1. dedurizata folosind coloana de rasina;
   2. purificata biologic utilizānd coloana de rasina;
   3. acidulata pentru baut;
   4. alcalinizeaza pentru baut;
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CO₃^2- -> HCO₃^- + HO^-
   2. NaOH + HCOO⁺ -> HCOONa + HO⁺
   3. NaOH + HCOO^- -> HCOONa + HO^-
   4. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + HCOO⁺ -> HCOONa + HO⁺
   2. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   3. NaOH + HCOO^- -> HCOONa + HO^-
   4. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   
   
2. We may say the followings:
   1. purification of the water may include chemical processes;
   2. water is good for drinking, it is nothing to be analysed;
   3. purification of the water may include physical processes;
   4. water is a good polar solvent;
   
   
3. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + Cl^- -> NaCl + HO^-
   2. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   3. NaOH + Cl⁺ -> NaCl + HO⁺
   4. NaOH + NO₃^- -> NaNO₃ + HO^-
   
   
4. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + CO₃^2- -> HCO₃^- + Cl^-
   2. HCl + HO^- -> H₂O + Cl^-
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   
   
5. 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 + HO^- -> H₂O + Cl^-
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + HCOO⁺ -> HCOONa + HO⁺
   2. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   3. NaOH + HCOO^- -> HCOONa + HO^-
   4. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   5. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   
   
2. Putem spune urmatoarele:
   1. purificarea apei poate include procese chimice;
   2. apa este buna pentru consum, nu este nimic de a fi analizat;
   3. purificarea apei poate include procedee fizice;
   4. apa este un solvent polar bun;
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + Cl^- -> NaCl + HO^-
   2. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   3. NaOH + Cl⁺ -> NaCl + HO⁺
   4. NaOH + NO₃^- -> NaNO₃ + HO^-
   5. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + CO₃^2- -> HCO₃^- + Cl^-
   2. HCl + HO^- -> H₂O+Cl^-
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   
   
5. 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 + HO^- -> H₂O + Cl^-
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + HCOO^- -> HCOONa + HO^-
   2. NaOH + HCOO⁺ -> HCOONa + HO⁺
   3. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   4. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   
   
2. We may say the followings:
   1. water is pure only when is taken from a good freshwater mountain stream;
   2. purification of the water may include biological processes;
   3. natural water may contain organic matter and living organisms;
   4. water is good for drinking, it is nothing to be analysed;
   
   
3. For a water sample following measures may be quantitatively expressed:
   1. mineral acidity;
   2. color;
   3. total acidity;
   4. total alkalinity;
   
   
4. In the laboratory the water were:
   1. biologically purified using the resin column;
   2. acidified for drinking purposes;
   3. complexed by using EDTA titrimetric method;
   4. hardened using the resin column;
   
   
5. 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 + CO₃²⁺ -> H₂CO₃ + Cl⁺
   4. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + HCOO^- -> HCOONa + HO^-
   2. NaOH + HCOO⁺ -> HCOONa + HO⁺
   3. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   4. NaOH + CO₃^2- -> HCO₃^- + HO^-
   
   
2. Putem spune urmatoarele:
   1. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   2. purificarea apei poate include procese biologice;
   3. apa naturala poate contine materie organica si organisme vii;
   4. apa este buna pentru consum, nu este nimic de a fi analizat;
   5. purificarea apei poate include procedee fizice;
   
   
3. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. aciditate minerala;
   2. culoare;
   3. aciditate totala;
   4. alcalinitate totala;
   5. alcalinitate permanenta;
   
   
4. In laborator apa au fost:
   1. purificata biologic utilizānd coloana de rasina;
   2. acidulata pentru baut;
   3. complexata prin metoda titrimetrica EDTA;
   4. calita folosind coloana de rasina;
   5. alcalinizeaza pentru baut;
   
   
5. 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 + CO₃²⁺ -> H₂CO₃ + Cl⁺
   4. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   5. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   
   

FINAL TEST AT LABORATORY
Water analysis

1. In the laboratory were analyzed:
   1. the hardness of the water;
   2. the solubility of the water;
   3. the color of the water;
   4. the acidity of the water;
   
   
2. In the laboratory the water were:
   1. softened using the resin column;
   2. complexed by using EDTA titrimetric method;
   3. acidified for drinking purposes;
   4. biologically purified using the resin column;
   
   
3. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   2. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   3. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   4. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   
4. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + Cl⁺ -> NaCl + HO⁺
   2. NaOH + Cl^- -> NaCl + HO^-
   3. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   4. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   
   
5. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   2. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Īn laborator au fost analizate:
   1. duritatea apei;
   2. solubilitatea apei;
   3. culoarea apei;
   4. aciditatea apei;
   
   
2. In laborator apa au fost:
   1. dedurizata folosind coloana de rasina;
   2. complexata prin metoda titrimetrica EDTA;
   3. acidulata pentru baut;
   4. purificata biologic utilizānd coloana de rasina;
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   2. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   3. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   4. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   5. HCl + HO^- -> H₂O + Cl^-
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + Cl⁺ -> NaCl + HO⁺
   2. NaOH + Cl^- -> NaCl + HO^-
   3. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   4. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   2. NaOH + Fe²⁺ -> Fe(OH)₂ + Na⁺
   3. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   4. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   5. HCl + CO₃^2- -> HCO₃^- + Cl^-
   
   

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

1. The aluminum plate:
   1. was involved in the volumetric method of corrosion analysis
   2. the volume is measured before and after immersing it in NaOH;
   3. was corroded in sodium hydroxide solution;
   4. was degreased in sodium hydroxide solution;
   
   
2. In studied corrosion processes:
   1. always the metal changes its oxidation state;
   2. a gas is released only the corrosion of aluminum;
   3. a gas is released only the corrosion of zinc;
   4. when a gas is released its volume depends on the amount of metal corroded;
   
   
3. Which of the following reactions may be called as of corrosion:
   1. Ni(CO)₄ -> Ni + CO
   2. H⁺ + Zn -> H₂ + Zn²⁺
   3. Al₂O₃ + NaOH -> NaAlO₂
   4. H⁺ + Fe -> H₂ + Fe²⁺
   
   
4. The zinc plate:
   1. was corroded in sulfuric solution;
   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 sulfuric acid solution;
   
   
5. Corrosion of metals:
   1. can be reduced by passivation;
   2. is the protection in time to chemical agents;
   3. is the destruction of metals under the action of external factors;
   4. can be reduced by electroplating;
   
   

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

1. Pentru placa de aluminiu:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. volumul se masoara īnainte si dupa imersia īn NaOH;
   3. a fost corodata īn solutie de hidroxid de sodiu;
   4. a fost degresata īn solutie de hidroxid de sodiu;
   
   
2. Īn procesele de coroziune studiate:
   1. īntotdeauna metalul isi schimba starea de oxidare;
   2. un gaz este eliberat numai la corodarea aluminiului;
   3. un gaz este eliberat numai la corodarea zincului;
   4. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   5. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   
   
3. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Ni(CO)₄ -> Ni + CO
   2. H⁺ + Zn -> H₂ + Zn²⁺
   3. Al₂O₃ + NaOH -> NaAlO₂
   4. H⁺ + Fe -> H₂ + Fe²⁺
   5. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
4. Pentru placa de zinc:
   1. a fost corodata īn solutie sulfuric;
   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 acid sulfuric;
   5. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   
   
5. Coroziunea metalelor:
   1. poate fi redusa prin pasivare;
   2. este protectia de durata impotriva agentilor chimici;
   3. este distrugerea metalelor sub actiunea factorilor externi;
   4. poate fi redusa prin galvanizare;
   5. are loc pur si simplu prin expunerea la umiditate īn aer;
   
   

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

1. In studied corrosion processes:
   1. a gas is released at both corrosion of zinc and aluminum;
   2. when a gas is released its volume depends on the amount of metal corroded;
   3. the metal it changes its oxidation state becoming an anion;
   4. the metal it changes its oxidation state becoming an cation;
   
   
2. The zinc plate:
   1. was degreased in sulfuric acid solution;
   2. the mass is measured before and after immersing it in H₂SO₄;
   3. the surface is measured before and after immersing it in H₂SO₄;
   4. was involved in the gravimetric method of corrosion analysis
   
   
3. Which of the following reactions may be called as of corrosion:
   1. Al₂O₃ + NaOH -> NaAlO₂
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   
   
4. Corrosion of metals:
   1. can be reduced by passivation;
   2. takes place merely from exposure to moisture in air;
   3. may provide useful raw materials for analysis;
   4. can be reduced by electroplating;
   
   
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. the surface is measured before and after immersing it in NaOH;
   4. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   
   

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

1. Īn procesele de coroziune studiate:
   1. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   2. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   3. metalul isi schimba starea de oxidare pentru a deveni un anion;
   4. metalul isi schimba starea de oxidare pentru a deveni un cation;
   
   
2. Pentru placa de zinc:
   1. a fost degresata īn solutie de acid sulfuric;
   2. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   3. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   5. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   
   
3. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Al₂O₃ + NaOH -> NaAlO₂
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   
   
4. Coroziunea metalelor:
   1. poate fi redusa prin pasivare;
   2. are loc pur si simplu prin expunerea la umiditate īn aer;
   3. poate furniza materii prime utile pentru analiza;
   4. poate fi redusa prin galvanizare;
   
   
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. suprafata se masoara īnainte si dupa imersia īn NaOH;
   4. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   
   

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 destruction of metals under the action of external factors;
   4. takes place merely from exposure to moisture in air;
   
   
2. In studied corrosion processes:
   1. a gas is released only the corrosion of aluminum;
   2. the metal it changes its oxidation state becoming an anion;
   3. a gas is released at both corrosion of zinc and aluminum;
   4. a gas is released only the corrosion of zinc;
   
   
3. The aluminum plate:
   1. was corroded in sodium hydroxide solution;
   2. was degreased in sodium hydroxide solution;
   3. the volume is measured before and after immersing it in NaOH;
   4. the mass is measured before and after immersing it in NaOH;
   
   
4. Which of the following reactions may be called as of corrosion:
   1. ZnO + CO -> Zn + CO₂
   2. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   3. Al₂O₃ + NaOH -> NaAlO₂
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
5. The zinc plate:
   1. was involved in the gravimetric method of corrosion analysis
   2. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   3. was degreased in sulfuric acid solution;
   4. the mass is measured before and after immersing it in H₂SO₄;
   
   

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 distrugerea metalelor sub actiunea factorilor externi;
   4. are loc pur si simplu prin expunerea la umiditate īn aer;
   5. poate furniza materii prime utile pentru analiza;
   
   
2. Īn procesele de coroziune studiate:
   1. un gaz este eliberat numai la corodarea aluminiului;
   2. metalul isi schimba starea de oxidare pentru a deveni un anion;
   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 aluminiu:
   1. a fost corodata īn solutie de hidroxid de sodiu;
   2. a fost degresata īn solutie de hidroxid de sodiu;
   3. volumul se masoara īnainte si dupa imersia īn NaOH;
   4. masa este masurata īnainte si dupa imersia īn NaOH;
   
   
4. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. ZnO + CO -> Zn + CO₂
   2. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   3. Al₂O₃ + NaOH -> NaAlO₂
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
5. Pentru placa de zinc:
   1. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   2. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   3. a fost degresata īn solutie de acid sulfuric;
   4. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   5. a fost corodata īn solutie sulfuric;
   
   

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

1. The aluminum plate:
   1. was corroded in sodium hydroxide solution;
   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 degreased in sodium hydroxide solution;
   
   
2. Corrosion of metals:
   1. can be reduced by electroplating;
   2. may provide useful raw materials for analysis;
   3. is a beneficial process that shows the stability of metals;
   4. takes place merely from exposure to moisture in air;
   
   
3. Which of the following reactions may be called as of corrosion:
   1. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   2. H⁺ + Ni -> H₂ + Ni²⁺
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. Ni(CO)₄ -> Ni + CO
   
   
4. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an cation;
   2. always the metal changes its oxidation state;
   3. when a gas is released its volume depends on the amount of metal corroded;
   4. the metal it changes its oxidation state becoming an anion;
   
   
5. The zinc plate:
   1. was degreased in sulfuric acid solution;
   2. the surface is measured before and after immersing it in H₂SO₄;
   3. the mass is measured before and after immersing it in H₂SO₄;
   4. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   
   

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

1. Pentru placa de aluminiu:
   1. a fost corodata īn solutie de hidroxid de sodiu;
   2. 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 degresata īn solutie de hidroxid de sodiu;
   5. a fost implicata īn metoda volumetrica de analiza a coroziunii
   
   
2. Coroziunea metalelor:
   1. poate fi redusa prin galvanizare;
   2. poate furniza materii prime utile pentru analiza;
   3. este un proces benefic care arata stabilitatea metalelor;
   4. are loc pur si simplu prin expunerea la umiditate īn aer;
   5. este protectia de durata impotriva agentilor chimici;
   
   
3. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   2. H⁺ + Ni -> H₂ + Ni²⁺
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. Ni(CO)₄ -> Ni + CO
   5. Fe₂O₃ + CO -> Fe + CO₂
   
   
4. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un cation;
   2. īntotdeauna metalul isi schimba starea de oxidare;
   3. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   4. metalul isi schimba starea de oxidare pentru a deveni un anion;
   5. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   
   
5. Pentru placa de zinc:
   1. a fost degresata īn solutie de acid sulfuric;
   2. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   3. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   4. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   5. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   
   

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

1. The aluminum plate:
   1. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   2. was degreased in sodium hydroxide solution;
   3. the volume is measured before and after immersing it in NaOH;
   4. was involved in the gravimetric method of corrosion analysis
   
   
2. Which of the following reactions may be called as of corrosion:
   1. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. Fe₂O₃ + CO -> Fe + CO₂
   
   
3. Corrosion of metals:
   1. is the protection in time to chemical agents;
   2. can be reduced by passivation;
   3. may provide useful raw materials for analysis;
   4. can be reduced by electroplating;
   
   
4. In studied corrosion processes:
   1. a gas is released at both corrosion of zinc and aluminum;
   2. the metal it changes its oxidation state becoming an anion;
   3. when a gas is released its volume depends on the amount of metal corroded;
   4. a gas is released only the corrosion of zinc;
   
   
5. The zinc plate:
   1. the surface is measured before and after immersing it in H₂SO₄;
   2. was involved in the gravimetric method of corrosion analysis
   3. was involved in the volumetric method of corrosion analysis
   4. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   
   

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

1. Pentru placa de aluminiu:
   1. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   2. a fost degresata īn solutie de hidroxid de sodiu;
   3. volumul se masoara īnainte si dupa imersia īn NaOH;
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   5. a fost corodata īn solutie de hidroxid de sodiu;
   
   
2. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   2. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   3. H⁺ + Fe -> H₂ + Fe²⁺
   4. Fe₂O₃ + CO -> Fe + CO₂
   
   
3. Coroziunea metalelor:
   1. este protectia de durata impotriva agentilor chimici;
   2. poate fi redusa prin pasivare;
   3. poate furniza materii prime utile pentru analiza;
   4. poate fi redusa prin galvanizare;
   5. are loc pur si simplu prin expunerea la umiditate īn aer;
   
   
4. Īn procesele de coroziune studiate:
   1. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   2. metalul isi schimba starea de oxidare pentru a deveni un anion;
   3. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   4. un gaz este eliberat numai la corodarea zincului;
   5. īntotdeauna metalul isi schimba starea de oxidare;
   
   
5. Pentru placa de zinc:
   1. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. a fost implicata īn metoda volumetrica de analiza a coroziunii
   4. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   5. a fost degresata īn solutie de acid sulfuric;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. The intensity of the current:
   1. is to be calculated after conducting the experiment;
   2. does not affect the quality nor the quantity of the nickel deposition;
   3. is to be calculated before to start the experiment;
   4. should be adjusted by the technicians, we have nothing to do there;
   
   
2. It is expected to have a mass of nickel deposited:
   1. inversely proportional with the nickel plating time;
   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;
   
   
3. Theoretical mass of nickel deposited is calculated using:
   1. perfect gas law;
   2. solutions laws;
   3. law of mass action;
   4. the conservation of the energy law;
   
   
4. Electrical conductivity of nickel salts solutions:
   1. depends on the intensity of the current used;
   2. is reduced by salts additions;
   3. is improved by salts additions;
   4. is relatively small;
   
   
5. At the nickel plating following reactions took place:
   1. at anode (+), connected with nickel piece, Ni⁰ - 2e^- -> Ni²⁺
   2. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the cathode: O^2- - 2e^- -> O₂⁰
   3. at cathode (-), connected with metallic piece, Ni⁰ - 2e^- -> Ni²⁺
   4. at cathode (-), connected with metallic piece, Ni²⁺ + 2e^- -> Ni⁰
   
   

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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