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

1. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all are moving in the same direction;
   2. all have same energy;
   3. all have same speed;
   4. all are moving in an arbitrary direction;
   
   
2. 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 propagation of the species as neutral molecules and not as ions;
   4. the virtual speeds and not the real speeds of each involved species;
   
   
3. The fog observed during the experiment is due to:
   1. presence of the ammonia;
   2. unproper illumination in the laboratory or our breathing;
   3. unproper illumination in the laboratory and our breathing;
   4. our experiment designed to trap the product of the reaction;
   
   
4. We may say the followings:
   1. the kinetic energy of a molecule is affected by temperature only;
   2. the molecules have speeds only in gaseous state;
   3. diffusion process appears only in gaseous state;
   4. the molecules have speeds in all gaseous, liquid and solid states;
   
   
5. The time to the formation 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 length of the tube and not of the width of the tube;
   4. the width of the tube and not of the length of the tube;
   
   

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

1. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate se deplaseaza īn aceeasi directie;
   2. toate au aceeasi energie;
   3. toate au aceeasi viteza;
   4. toate se īndreapta īntr-o directie arbitrara;
   5. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   
   
2. Pozitia inelului īn experimentul este dependenta de:
   1. concentratiile solutiilor utilizate;
   2. latimea tubului si nu lungimea tubului;
   3. propagarea speciilor ca si molecule neutre si nu ca si ioni;
   4. vitezele virtuale si nu vitezele reale ale fiecarei specii implicate;
   
   
3. Ceata observata īn timpul experimentului se datoreaza:
   1. prezentei amoniacului;
   2. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   3. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   4. experimentului nostru proiectat pentru a captura produsul de reactie;
   
   
4. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. energia cinetica a unei molecule este afectata de numai temperatura;
   2. moleculele au viteze numai īn stare gazoasa;
   3. proces de difuzie apare numai īn stare gazoasa;
   4. moleculele au viteze īn toate starile gazoasa, lichida si solida;
   
   
5. Timpul pentru formarea 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. lungimea tubului si nu latimea tubului;
   4. latimea tubului si nu lungimea tubului;
   5. 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. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. are considered to be at the same temperature, but may have different energies;
   2. all are moving in an arbitrary direction;
   3. all are moving in the same direction;
   4. all have same speed;
   
   
2. The fog observed during the experiment is due to:
   1. unproper illumination in the laboratory and our breathing;
   2. formation of ammonium chloride;
   3. unproper illumination in the laboratory or our breathing;
   4. presence of the chlorine;
   
   
3. The time to the formation of the ring in the experiment is dependent on:
   1. the average energy or average speed of each involved species;
   2. the speed of diffusion of each involved species;
   3. the length of the tube and not of the width of the tube;
   4. the width of the tube and not of the length of the tube;
   
   
4. The position of the ring in the experiment is dependent on:
   1. the concentrations of the solutions used;
   2. the mode energy or mode speed of each involved species;
   3. the real speeds and not the virtual speeds of each involved species;
   4. the length of the tube and the width of the tube;
   
   
5. We may say the followings:
   1. the molecules have energy only in gaseous state;
   2. the kinetic energy of a molecule is affected by temperature and pressure;
   3. diffusion process appears only in gaseous and liquid states;
   4. the kinetic energy of a molecule is affected by temperature only;
   
   

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

1. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. sunt considerate a fi la aceeasi temperatura, dar pot avea diferite energii;
   2. toate se īndreapta īntr-o directie arbitrara;
   3. toate se deplaseaza īn aceeasi directie;
   4. toate au aceeasi viteza;
   5. toate au aceeasi energie;
   
   
2. Ceata observata īn timpul experimentului se datoreaza:
   1. iluminarii necorespunzatoare īn laborator si respiratiei noastre;
   2. formarea clorurii de amoniu;
   3. iluminarii necorespunzatoare īn laborator sau respiratie noastre;
   4. prezentei clorului;
   5. prezentei amoniacului;
   
   
3. Timpul pentru formarea inelului īn experimentul este dependenta de:
   1. energia medie sau viteza medie a fiecarei specii implicate;
   2. viteza de difuzie a fiecarei specii implicate;
   3. lungimea tubului si nu latimea tubului;
   4. latimea tubului si nu lungimea tubului;
   
   
4. Pozitia inelului īn experimentul este dependenta de:
   1. concentratiile solutiilor utilizate;
   2. viteza la moda sau energia la moda a fiecarei specii implicate;
   3. vitezele reale si nu vitezele virtuale ale fiecarei specii implicate;
   4. lungimea tubului si latimea tubului;
   5. latimea tubului si nu lungimea tubului;
   
   
5. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. moleculele au energie numai īn stare gazoasa;
   2. energia cinetica a unei molecule este afectata de temperatura si presiune;
   3. proces de difuzie apare numai īn stare gazoasa si lichida;
   4. energia cinetica a unei molecule este afectata de numai temperatura;
   
   

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

1. At the ends of the tube following equilibrium reactions occurs:
   1. H₂O \=\ H⁺ + HO^-
   2. HCl + H₂O \=\ Cl^- + H₃O⁺
   3. H⁺ + HO^- \=\ H₂O
   4. NH₄⁺ + Cl^- \=\ NH₄Cl
   
   
2. The chronometer is used in the experiment for:
   1. synchronization of the diffusion times;
   2. indication of the moment when we should pay attention to the experiment;
   3. to keep us busy;
   4. extracting the information necessary to calculate the speeds ratio;
   
   
3. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all are moving in an arbitrary direction;
   2. all have same speed;
   3. are considered to be at the same temperature, but may have different speeds;
   4. all have same energy;
   
   
4. The fog observed during the experiment is due to:
   1. presence of the chlorine;
   2. unproper illumination in the laboratory or our breathing;
   3. our experiment designed to trap the product of the reaction;
   4. formation of ammonium chloride;
   
   
5. The time to the formation of the ring in the experiment is dependent on:
   1. the mode energy or mode speed of each involved species;
   2. the average energy or average speed of each involved species;
   3. the speed of diffusion of each involved species;
   4. the concentrations of the solutions used;
   
   

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

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

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

1. At the ends of the tube following equilibrium reactions occurs:
   1. NH₄⁺ + Cl^- \=\ NH₄Cl
   2. NH₃ + HCl \=\ NH₄Cl
   3. H⁺ + HO^- \=\ H₂O
   4. HCl + H₂O \=\ Cl^- + H₃O⁺
   
   
2. We may say the followings:
   1. the molecules have energy only in gaseous state;
   2. the molecules have speeds in all gaseous, liquid and solid states;
   3. the molecules have energy only in gaseous and liquid states;
   4. the molecules have speeds only in gaseous and liquid states;
   
   
3. The fog observed during the experiment is due to:
   1. unproper illumination in the laboratory and our breathing;
   2. unproper illumination in the laboratory or our breathing;
   3. formation of ammonium chloride;
   4. presence of the chlorine;
   
   
4. The chronometer is used in the experiment for:
   1. to keep us busy;
   2. indication of the moment when we should pay attention to the experiment;
   3. synchronization of the diffusion times;
   4. measuring of the diffusion time;
   
   
5. The position of the ring in the experiment is dependent on:
   1. the width of the tube and not of the length of the tube;
   2. the mode energy or mode speed of each involved species;
   3. the propagation of the species as neutral molecules and not as ions;
   4. the concentrations of the solutions used;
   
   

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

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

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

1. We may say the followings:
   1. the kinetic energy of a molecule is affected by temperature, pressure and size of the molecule;
   2. the molecules have speeds only in gaseous and liquid states;
   3. the molecules have energy only in gaseous state;
   4. the kinetic energy of a molecule is affected by temperature and pressure;
   
   
2. The chronometer is used in the experiment for:
   1. synchronization of the diffusion times;
   2. indication of the moment when we should pay attention to the experiment;
   3. extracting the information necessary to calculate the speeds ratio;
   4. measuring of the diffusion time;
   
   
3. At the ends of the tube following equilibrium reactions occurs:
   1. NH₃ + H₂O \=\ NH₄⁺ + HO^-
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. NH₃ + HCl \=\ NH₄Cl
   4. H⁺ + HO^- \=\ H₂O
   
   
4. As you concluded from the experiment, the molecules of a gas at equilibrium:
   1. all have same energy;
   2. all are moving in an arbitrary direction;
   3. are considered to be at the same temperature, but may have different speeds;
   4. all are moving in the same direction;
   
   
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. Va rugam sa decida cu adevarat / fals pentru urmatoarele afirmatii:
   1. energia cinetica a unei molecule este afectata de temperatura, presiune si dimensiunea moleculei;
   2. moleculele au viteze numai īn stare gazoasa si lichida;
   3. moleculele au energie numai īn stare gazoasa;
   4. energia cinetica a unei molecule este afectata de temperatura si presiune;
   
   
2. Cronometrul este utilizat īn experimentul pentru:
   1. sincronizarea timpilor de difuzie;
   2. indicarea momentului cānd trebuie sa se acorde atentie experimentului;
   3. extragerea informatiilor necesare pentru calcularea raportului vitezelor;
   4. masurarea timpului de difuzie;
   5. sa ne tina ocupati;
   
   
3. La capetele tubului urmatoarele reactii de echilibru apar:
   1. NH₃ + H₂O \ = \ NH₄⁺ + HO^-
   2. NH₄⁺ + Cl^- \=\ NH₄Cl
   3. NH₃ + HCl \=\ NH₄Cl
   4. H⁺ + HO^- \=\ H₂O
   5. H₂O \=\ H⁺ + HO^-
   
   
4. Asa cum s-a concluzionat din experiment, moleculele unui gaz la echilibru:
   1. toate au aceeasi energie;
   2. toate se īndreapta īntr-o directie arbitrara;
   3. sunt considerate a fi la aceeasi temperatura, dar pot avea viteze diferite;
   4. toate se deplaseaza īn aceeasi directie;
   
   
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;
   5. prezentei amoniacului;
   
   

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

1. In the laboratory were studied:
   1. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   2. the producing of some gas as result of a lost of the mass of a solid;
   3. decomposition of the potasium chlorate to potasium chloride when oxygen is released;
   4. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   
   
2. For gaseous state:
   1. the pressure is much lower than in liquid state;
   2. the pressure depends on the model which are used to approximate it;
   3. it exists an equation for all, p · V = n · R · T;
   4. the pressure is much higher than in liquid state;
   
   
3. 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. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   4. distillation of the liquid air;
   
   
4. The values taken from the experiment conducted in the laboratory indicated that:
   1. ozone were released as result of the decomposition;
   2. we possess enough information to decide what gas was released from the reaction;
   3. the ideal model of a gas approximated the worst the behavior of the released gas;
   4. we do not possess enough information to decide what gas was released from the reaction;
   
   
5. A state equation for a real gas is:
   1. a relation derived to approximate the relation between state parameters;
   2. a relation which may involve some constants dependent of gas composition;
   3. a relation which is always true, independent of the values of the state parameters;
   4. a relation obtained after conducting of the experiment;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Īn laborator s-au studiat:
   1. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   2. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   3. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   4. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   5. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   
   
2. Pentru stare gazoasa:
   1. presiunea este mult mai mica decāt īn stare lichida;
   2. presiunea depinde de modelul care este utilizat pentru o aproxima;
   3. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   4. presiunea este mult mai mare decāt īn stare lichida;
   5. presiunea este aproximativ aceeasi ca si īn stare lichida;
   
   
3. 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. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   4. distilarea aerului lichid;
   5. H₂O₂ -> H₂O + O₂;
   
   
4. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. ozonul au fost eliberat ca urmare a descompunerii;
   2. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   3. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   4. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   5. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   
   
5. O ecuatie de stare pentru un gaz real este:
   1. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   2. o relatie care poate implica unele constante dependente de compozitia gazului;
   3. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   4. o relatie obtinut dupa efectuarea experimentului;
   
   

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

1. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. H₂O₂ -> H₂O + O₂;
   2. Ag₂O -> Ag + O₂;
   3. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   4. KNO₃ -> KNO₂ + O₂;
   
   
2. In the laboratory were studied:
   1. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   2. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   3. the producing of some gas as result of a lost of the mass of a solid;
   4. the lost of the mass of a solid as result of producing of some gas;
   
   
3. A state equation for a real gas is:
   1. usable in the laboratory, but is not to be used somewhere else;
   2. a relation which takes into account certain deviations from the ideal model;
   3. a relation which is always true, independent of the values of the state parameters;
   4. a relation between an unlimited number of state parameters;
   
   
4. For gaseous state:
   1. the pressure is unchanged when a chemical reaction occurs;
   2. the pressure is exactly the same as in liquid state;
   3. the pressure is much higher than in liquid state;
   4. the pressure is approximately the same as in liquid state;
   
   
5. 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 best the behavior of the released gas;
   3. as more simple the model is used to approximate the behavior, as best agreement is obtained;
   4. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. H₂O₂ -> H₂O + O₂;
   2. Ag₂O -> Ag + O₂;
   3. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   4. KNO₃ -> KNO₂ + O₂;
   5. KNO₂ + O₂ -> KNO₃;
   
   
2. Īn laborator s-au studiat:
   1. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   2. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   3. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   4. pierdut din masa de solid ca urmare a producerii unor gaze;
   
   
3. O ecuatie de stare pentru un gaz real este:
   1. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   2. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   3. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   4. o relatie īntre un numar nelimitat de parametri de stare;
   5. o relatie obtinut dupa efectuarea experimentului;
   
   
4. Pentru stare gazoasa:
   1. presiunea este neschimbata cānd apare o reactie chimica;
   2. presiunea este exact la fel ca si īn stare lichida;
   3. presiunea este mult mai mare decāt īn stare lichida;
   4. presiunea este aproximativ aceeasi ca si īn stare lichida;
   
   
5. 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 bine comportamentul gazului eliberat;
   3. cu cat mai simplu este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   4. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   5. ozonul au fost eliberat ca urmare a descompunerii;
   
   

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

1. For gaseous state:
   1. we need to take supplementary precautions in the laboratory;
   2. the pressure is subject to change when a chemical reaction occurs;
   3. it exists an equation for all, p · V = n · R · T;
   4. the pressure is much lower than in liquid state;
   
   
2. In the laboratory were studied:
   1. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₃;
   2. the producing of some gas as result of a lost of the mass of a solid;
   3. the lost of the mass of a solid as result of producing of some gas;
   4. increasing of the temperature of a solid mass when was heated;
   
   
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. air were released as result of the decomposition;
   4. the ideal model of a gas approximated the worst the behavior of the released gas;
   
   
4. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. Ag + O₂ -> Ag₂O;
   2. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   3. KNO₃ -> KNO₂ + O₂;
   4. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   
   
5. A state equation for a real gas is:
   1. a relation between an unlimited number of state parameters;
   2. a relation between an certain number of state parameters;
   3. a relation obtained after conducting of the experiment;
   4. a relation which is always true, independent of the values of the state parameters;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. Pentru stare gazoasa:
   1. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   2. presiunea se pot modifica atunci cānd apare o reactie chimica;
   3. ca exista o ecuatie utilizabila mereu, p · V = n · R · T;
   4. presiunea este mult mai mica decāt īn stare lichida;
   
   
2. Īn laborator s-au studiat:
   1. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₃;
   2. producerea unor gaze ca urmare a unei pierderi de masa a unui solid;
   3. pierdut din masa de solid ca urmare a producerii unor gaze;
   4. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   5. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul este eliberat;
   
   
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. aer a fost eliberat ca urmare a descompunerii;
   4. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   
   
4. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. Ag + O₂ -> Ag₂O;
   2. K₂CrO₄ + Cr₂O₃ + O₂ -> K₂Cr₂O₇;
   3. KNO₃ -> KNO₂ + O₂;
   4. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   5. KNO₂ + O₂ -> KNO₃;
   
   
5. O ecuatie de stare pentru un gaz real este:
   1. o relatie īntre un numar nelimitat de parametri de stare;
   2. o relatie īntre un anumit numar de parametri de stare;
   3. o relatie obtinut dupa efectuarea experimentului;
   4. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   
   

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 obtained after conducting of the experiment;
   2. a relation which takes into account certain deviations from the ideal model;
   3. usable in the laboratory, but is not to be used somewhere else;
   4. a relation between an certain number of state parameters;
   
   
2. The values taken from the experiment conducted in the laboratory indicated that:
   1. as more complex the model is used to approximate the behavior, as best agreement is obtained;
   2. we possess enough information to decide what gas was released from the reaction;
   3. air were released as result of the decomposition;
   4. the ideal model of a gas approximated the worst the behavior of the released gas;
   
   
3. For gaseous state:
   1. the pressure is much lower than in liquid state;
   2. we need to take supplementary precautions in the laboratory;
   3. the pressure is subject to change when a chemical reaction occurs;
   4. the pressure is unchanged when a chemical reaction occurs;
   
   
4. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   2. KCl + O₂ -> KClO₃;
   3. KNO₂ + O₂ -> KNO₃;
   4. KClO₃ -> KCl + O₂;
   
   
5. In the laboratory were studied:
   1. increasing of the temperature of a solid mass when was heated;
   2. decomposition of the potasium chloride to potasium chlorate when ozone is released;
   3. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   4. increasing of the pressure of a gas when was heated;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. O ecuatie de stare pentru un gaz real este:
   1. o relatie obtinut dupa efectuarea experimentului;
   2. o relatie care sa tina cont de anumite abateri de la modelul ideal;
   3. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   4. o relatie īntre un anumit numar de parametri de stare;
   
   
2. Valorile luate din experimentul efectuat īn laborator au indicat ca:
   1. cu cat mai complex este modelul folosit pentru a aproxima comportamentul, cu atat este mai bun este agrementul;
   2. avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   3. aer a fost eliberat ca urmare a descompunerii;
   4. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   5. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   
3. Pentru stare gazoasa:
   1. presiunea este mult mai mica decāt īn stare lichida;
   2. avem nevoie pentru a lua masuri de precautie suplimentare īn laborator;
   3. presiunea se pot modifica atunci cānd apare o reactie chimica;
   4. presiunea este neschimbata cānd apare o reactie chimica;
   5. presiunea depinde de modelul care este utilizat pentru o aproxima;
   
   
4. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. K₂Cr₂O₇ -> K₂CrO₄ + Cr₂O₃ + O₂;
   2. KCl + O₂ -> KClO₃;
   3. KNO₂ + O₂ -> KNO₃;
   4. KClO₃ -> KCl + O₂;
   
   
5. Īn laborator s-au studiat:
   1. cresterea temperaturii unei mase solide cānd s-a īncalzit;
   2. descompunerea clorurii de potasiu la cloratul de potasiu cānd ozonul este eliberat;
   3. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   4. cresterea presiunii unui gaz cānd s-a īncalzit;
   5. descompunerea cloratului de potasiu la clorura de potasiu cānd oxigenul 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 unlimited number of state parameters;
   2. a relation which is always true, independent of the values of the state parameters;
   3. usable in the laboratory, but is not to be used somewhere else;
   4. a relation which may involve some constants dependent of gas composition;
   
   
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 best the behavior of the released gas;
   3. the ideal model of a gas approximated the worst the behavior of the released gas;
   4. we do not possess enough information to decide what gas was released from the reaction;
   
   
3. For gaseous state:
   1. the pressure is subject to change when a chemical reaction occurs;
   2. the pressure is much higher than in liquid state;
   3. the pressure is unchanged when a chemical reaction occurs;
   4. the pressure depends on the model which are used to approximate it;
   
   
4. Based on our experience after conducting the experiment, we may say that the oxygen can be obtained from:
   1. H₂O₂ -> H₂O + O₂;
   2. KNO₃ -> KNO₂ + O₂;
   3. KClO₃ -> KCl + O₂;
   4. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   
   
5. In the laboratory were studied:
   1. decomposition of the potasium chlorate to potasium chloride when ozone is released;
   2. decomposition of the potasium chloride to potasium chlorate when oxygen is released;
   3. increasing of the pressure of a gas when was heated;
   4. the obtaining of the oxygen, by using the reaction KClO₃ (+MnO₂, heat) -> KCl + O₂;
   
   

TEST DE FINAL DE LABORATOR
Obtinerea oxigenului: studiul legilor gazelor

1. O ecuatie de stare pentru un gaz real este:
   1. o relatie īntre un numar nelimitat de parametri de stare;
   2. o relatie care este īntotdeauna adevarata, independent de valorile parametrilor de stare;
   3. utilizabila īn laborator, dar nu este de a fi utilizata īn alta parte;
   4. o relatie care poate implica unele constante dependente de compozitia gazului;
   5. o relatie derivata pentru a aproxima relatia dintre parametrii de stare;
   
   
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 bine comportamentul gazului eliberat;
   3. modelul ideal al unui gaz aproximeaza cel mai rau comportamentul gazului eliberat;
   4. nu avem suficiente informatii pentru a decide ce gaz a fost eliberat din reactie;
   
   
3. Pentru stare gazoasa:
   1. presiunea se pot modifica atunci cānd apare o reactie chimica;
   2. presiunea este mult mai mare decāt īn stare lichida;
   3. presiunea este neschimbata cānd apare o reactie chimica;
   4. presiunea depinde de modelul care este utilizat pentru o aproxima;
   
   
4. Pe baza experientei noastre dupa efectuarea experimentului, putem spune ca oxigenul poate fi obtinut din:
   1. H₂O₂ -> H₂O + O₂;
   2. KNO₃ -> KNO₂ + O₂;
   3. KClO₃ -> KCl + O₂;
   4. K₂MnO₄ + MnO₂ + O₂ -> KMnO₄;
   5. KMnO₄ -> K₂MnO₄ + MnO₂ + O₂;
   
   
5. Īn laborator s-au studiat:
   1. descompunerea cloratului de potasiu la clorura de potasiu cānd ozonul este eliberat;
   2. descompunerea clorurii de potasiu la cloratul de potasiu cānd oxigenul este eliberat;
   3. cresterea presiunii unui gaz cānd s-a īncalzit;
   4. obtinerea de oxigen, folosind reactia KClO₃(+ MnO₂, caldura) -> KCl + O₂;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When lead is identified:
   1. a red-brown complex appears;
   2. interference of other ions may affect the outcome;
   3. the reactions used clearly indicates its presence;
   4. a yellow complex appears;
   
   
2. When aluminum is identified:
   1. using of ammonium hidroxide is enough in order to have a clear guess about the presence of aluminum;
   2. is identified as Al³⁺ cation;
   3. the presence of other ions may produce a true negative outcome;
   4. supplementary precautions should be taken, because the plates are made from aluminum too;
   
   
3. 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 quantitative method of analysis;
   4. a destructive method of analysis;
   
   
4. The electric charges after passing the metals into solution may be:
   1. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   3. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   
5. The paper requires before analysis of the sample:
   1. to be burned;
   2. to measure its surface;
   3. to be tested;
   4. to be acidified;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd plumbul este identificat:
   1. apare un complex rosu-brun;
   2. interferenta altor ioni poate afecta rezultatul;
   3. reactiile utilizate īn mod clar ii indica prezenta;
   4. apare un complex galben;
   
   
2. Cānd aluminiu este identificat:
   1. folosirea hidroxidului de amoniu este suficient pentru a avea indicii clare cu privire la prezenta aluminiului;
   2. este identificat ca cationul Al³⁺;
   3. prezenta altor ioni poate produce un rezultat adevarat negativ;
   4. ar trebui sa fie luate masuri de precautie suplimentare deoarece talerele sunt realizate din aluminiu deasemenea;
   5. prezenta altor ioni poate produce un rezultat fals pozitiv;
   
   
3. 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 cantitativa de analiza;
   4. o metoda distructiva de analiza;
   
   
4. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   3. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   
5. Hartia necesita ca īnainte de analiza probei:
   1. sa fie arsa;
   2. sa i se masoare suprafata;
   3. sa fie testata;
   4. sa fie acidulata;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When aluminum is identified:
   1. the presence of other ions may produce a false positive outcome;
   2. is identified as Al³⁺ cation;
   3. supplementary precautions should be taken, because the plates are made from aluminum too;
   4. the presence of other ions may produce a false negative outcome;
   
   
2. Why moisten the paper with solution of sodium nitrate?
   1. for the paper to work as isolator;
   2. to accomodate ourselves to use chemicals;
   3. to be cut easily with scissors;
   4. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   
   
3. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   2. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   
   
4. The paper requires before analysis of the sample:
   1. to be cut in small pieces;
   2. to be dry;
   3. to be tested;
   4. to be acidified;
   
   
5. This method of analysis of metals and alloys is:
   1. too ancient to be used today in the laboratory;
   2. a destructive method of analysis;
   3. useful for pure metals, not so useful for alloys;
   4. a nondestructive method of analysis;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd aluminiu este identificat:
   1. prezenta altor ioni poate produce un rezultat fals pozitiv;
   2. este identificat ca cationul Al³⁺;
   3. ar trebui sa fie luate masuri de precautie suplimentare deoarece talerele sunt realizate din aluminiu deasemenea;
   4. prezenta altor ioni poate produce un rezultat fals negativ;
   
   
2. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru ca hartia sa actioneze ca izolator;
   2. sa ne acomodam in a utiliza substante chimice;
   3. sa fie taiat cu usurinta cu foarfeca;
   4. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   5. pentru furniza cationi pentru analiza;
   
   
3. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   2. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   3. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   4. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   5. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   
   
4. Hartia necesita ca īnainte de analiza probei:
   1. sa fie taiata īn bucati mici;
   2. sa fie uscata;
   3. sa fie testata;
   4. sa fie acidulata;
   
   
5. Aceasta metoda de analiza de metale si aliaje este:
   1. prea veche pentru a fi utilizata īn prezent īn laborator;
   2. o metoda distructiva de analiza;
   3. utila pentru metale pure, nu atāt de utila pentru aliaje;
   4. o metoda nedistructiva de analiza;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. When aluminum is identified:
   1. is identified as Al¹⁺ cation;
   2. using of alizarin along with ammonium hidroxide provide a more selective indication about the presence of aluminum;
   3. is identified as Al²⁺ cation;
   4. supplementary precautions should be taken, because the plates are made from aluminum too;
   
   
2. This method of analysis of metals and alloys is:
   1. a quantitative method of analysis;
   2. useful for pure metals, not so useful for alloys;
   3. useful for both metals and alloys;
   4. too ancient to be used today in the laboratory;
   
   
3. When lead is identified:
   1. the reactions used clearly indicates its presence;
   2. dangerous substances are used;
   3. a blue complex appears;
   4. precautions should be made for toxic wastes disposal;
   
   
4. The paper requires before analysis of the sample:
   1. to be burned;
   2. to be dry;
   3. to be moistened with an electrolyte;
   4. to measure its surface;
   
   
5. Why moisten the paper with solution of sodium nitrate?
   1. to have something to do in the laboratory;
   2. to provide cations for analysis;
   3. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   4. for stopping after a while the chemical reaction that takes place;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Cānd aluminiu este identificat:
   1. este identificat ca cationul Al¹⁺;
   2. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un indiciu mai selectiv cu privire la prezenta aluminiului;
   3. este identificat ca cationul Al²⁺;
   4. ar trebui sa fie luate masuri de precautie suplimentare deoarece talerele sunt realizate din aluminiu deasemenea;
   
   
2. Aceasta metoda de analiza de metale si aliaje este:
   1. o metoda cantitativa de analiza;
   2. utila pentru metale pure, nu atāt de utila pentru aliaje;
   3. utila atāt pentru metale si aliaje;
   4. prea veche pentru a fi utilizata īn prezent īn laborator;
   
   
3. Cānd plumbul este identificat:
   1. reactiile utilizate īn mod clar ii indica prezenta;
   2. sunt utilizate substante periculoase;
   3. apare un complex albastru;
   4. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   5. apare un complex violet;
   
   
4. Hartia necesita ca īnainte de analiza probei:
   1. sa fie arsa;
   2. sa fie uscata;
   3. sa fie umezita cu un electrolit;
   4. sa i se masoare suprafata;
   
   
5. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru a avea ceva de a face īn laborator;
   2. pentru furniza cationi pentru analiza;
   3. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   4. pentru oprirea dupa un timp reactiei chimice care are loc;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. Why moisten the paper with solution of sodium nitrate?
   1. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   2. for the paper to work as isolator;
   3. to provide cations for analysis;
   4. for stopping after a while the chemical reaction that takes place;
   
   
2. When lead is identified:
   1. the reactions used clearly indicates its presence;
   2. a blue complex appears;
   3. a yellow complex appears;
   4. interference of other ions may affect the outcome;
   
   
3. This method of analysis of metals and alloys is:
   1. a gravimetric method of analysis;
   2. a nondestructive method of analysis;
   3. useful for pure metals, not so useful for alloys;
   4. too ancient to be used today in the laboratory;
   
   
4. The electric charges after passing the metals into solution may be:
   1. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
   
   
5. When aluminum is identified:
   1. is identified as Al³⁺ cation;
   2. the presence of other ions may produce a true negative outcome;
   3. there are many identification reactions possible;
   4. the presence of other ions may produce a false positive outcome;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   2. pentru ca hartia sa actioneze ca izolator;
   3. pentru furniza cationi pentru analiza;
   4. pentru oprirea dupa un timp reactiei chimice care are loc;
   5. pentru a avea ceva de a face īn laborator;
   
   
2. Cānd plumbul este identificat:
   1. reactiile utilizate īn mod clar ii indica prezenta;
   2. apare un complex albastru;
   3. apare un complex galben;
   4. interferenta altor ioni poate afecta rezultatul;
   5. sunt utilizate substante periculoase;
   
   
3. Aceasta metoda de analiza de metale si aliaje este:
   1. o metoda gravimetrica de analiza;
   2. o metoda nedistructiva de analiza;
   3. utila pentru metale pure, nu atāt de utila pentru aliaje;
   4. prea veche pentru a fi utilizata īn prezent īn laborator;
   5. o metoda cantitativa de analiza;
   
   
4. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe³⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   2. Fe²⁺; Pb²⁺; Sn⁴⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   4. dependente de intensitatea curentului aplicat la electrograf si compozitia aliajului metalic;
   5. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   
   
5. Cānd aluminiu este identificat:
   1. este identificat ca cationul Al³⁺;
   2. prezenta altor ioni poate produce un rezultat adevarat negativ;
   3. exista multe reactii posibile de identificare;
   4. prezenta altor ioni poate produce un rezultat fals pozitiv;
   
   

FINAL TEST AT LABORATORY
Qualitative analysis of metals and alloys

1. The paper requires before analysis of the sample:
   1. to be tested;
   2. to be moistened with an electrolyte;
   3. to measure its surface;
   4. to be burned;
   
   
2. Why moisten the paper with solution of sodium nitrate?
   1. for the paper to work as isolator;
   2. to work as an electrolyte and to allow passing of the electrical current through moistened paper;
   3. to be cut easily with scissors;
   4. to have something to do in the laboratory;
   
   
3. When aluminum is identified:
   1. using of alizarin along with ammonium hidroxide provide a more selective indication about the presence of aluminum;
   2. the presence of other ions may produce a false negative outcome;
   3. is identified as Al²⁺ cation;
   4. the presence of other ions may produce a true negative outcome;
   
   
4. The electric charges after passing the metals into solution may be:
   1. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   2. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   
   
5. When lead is identified:
   1. precautions should be made for toxic wastes disposal;
   2. a violet complex appears;
   3. the reactions used clearly indicates its presence;
   4. a heat release is observed;
   
   

TEST DE FINAL DE LABORATOR
Analiza calitativa a metalelor si aliajelor

1. Hartia necesita ca īnainte de analiza probei:
   1. sa fie testata;
   2. sa fie umezita cu un electrolit;
   3. sa i se masoare suprafata;
   4. sa fie arsa;
   
   
2. De ce umezim hārtia cu solutie de azotat de sodiu?
   1. pentru ca hartia sa actioneze ca izolator;
   2. pentru a lucra ca un electrolit si pentru a permite trecerea de curent electric prin hārtia umezita;
   3. sa fie taiat cu usurinta cu foarfeca;
   4. pentru a avea ceva de a face īn laborator;
   5. sa ne acomodam in a utiliza substante chimice;
   
   
3. Cānd aluminiu este identificat:
   1. folosirea alizarinei, īmpreuna cu hidroxidul de amoniu ofera un indiciu mai selectiv cu privire la prezenta aluminiului;
   2. prezenta altor ioni poate produce un rezultat fals negativ;
   3. este identificat ca cationul Al²⁺;
   4. prezenta altor ioni poate produce un rezultat adevarat negativ;
   5. ar trebui sa fie luate masuri de precautie suplimentare deoarece talerele sunt realizate din aluminiu deasemenea;
   
   
4. Sarcinile electrice ce apar la trecerea metalelor īn solutie pot fi:
   1. Fe²⁺; Ni¹⁺; Cu¹⁺; Zn³⁺; Co²⁺; Cr⁶⁺
   2. Fe²⁺; Ni⁴⁺; Cu¹⁺; Zn²⁺; Co⁵⁺; Cr⁶⁺
   3. Fe²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Co²⁺; Cr³⁺
   4. Fe²⁺; Co²⁺; Ni²⁺; Cu²⁺; Zn²⁺; Al³⁺
   5. Fe²⁺; Ni³⁺; Cu¹⁺; Zn³⁺; Co³⁺; Cr²⁺
   
   
5. Cānd plumbul este identificat:
   1. ar trebui sa fie luate masuri de precautie pentru deseurile toxice eliminate;
   2. apare un complex violet;
   3. reactiile utilizate īn mod clar ii indica prezenta;
   4. se observa o eliberare de caldura;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. A redox process:
   1. is considered to be the following one: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   2. involves a transfer of electrons from one atom or group of atoms to another;
   3. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. is always fast and safe;
   
   
2. The density of the solutions depends on:
   1. concentration;
   2. quantity;
   3. time elapsed since were prepared;
   4. provider;
   
   
3. Titration as a laboratory operation involves:
   1. a burette;
   2. a pH-metter;
   3. a volume measurement;
   4. a sulphuric acid solution;
   
   
4. In the calculations:
   1. are necessary to discuss with our colleagues;
   2. are necessary to take the results imediatly after these are available from others;
   3. are necessary to use some formulas expressing in different ways the concentration;
   4. are necessary to draw the tables in our notebooks after completing of the experiment;
   
   
5. The equivalence point is:
   1. the point in which a reactive should be added in the burette;
   2. the point in which a reactive should be added in the reaction flask;
   3. something rarely encountered in chemistry;
   4. indicated when a color change is observed into the solution;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Un proces redox:
   1. este considerat a fi urmatorul: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   2. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   3. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. este īntotdeauna rapid si sigur;
   5. implica schimbarea a starilor de agregare ale unor participanti la reactie;
   
   
2. Densitatea solutiilor depinde de:
   1. concentratie;
   2. cantitate;
   3. timpul scurs de cand au fost pregatite;
   4. furnizor;
   5. presiune;
   
   
3. Titrarea ca o operatiune de laborator implica:
   1. o biureta;
   2. un pH-metru;
   3. masurarea volumului;
   4. o solutie de acid sulfuric;
   5. amestecul a doua sau mai multe solutii;
   
   
4. In calcule:
   1. este necesar sa discutam cu colegii;
   2. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   3. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   4. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   5. este necesara stabilirea coeficientilor reactiei chimice;
   
   
5. Punctul de echivalenta este:
   1. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   2. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   3. ceva rar īntālnit īn chimie;
   4. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The density of the solutions depends on:
   1. quantity;
   2. provider;
   3. concentration;
   4. time elapsed since were prepared;
   
   
2. In the calculations:
   1. are necessary to use our phones;
   2. are necessary to discuss with our colleagues;
   3. are necessary to take the results imediatly after these are available from others;
   4. are necessary to establish the coefficients of the chemical reaction;
   
   
3. When a chemical reaction is balanced, following should be considered:
   1. all glassware should be clean before and after conducting 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 number of atoms for each element;
   4. all glassware should be clean before, after and during the experiment;
   
   
4. The following chemical reactions were used in the experiments:
   1. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   2. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   3. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. H₂O + CO₂ -> H₂CO₃
   
   
5. Titration as a laboratory operation involves:
   1. a mass measurement;
   2. a volume measurement;
   3. a salt solution;
   4. a natrium hydroxide solution;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Densitatea solutiilor depinde de:
   1. cantitate;
   2. furnizor;
   3. concentratie;
   4. timpul scurs de cand au fost pregatite;
   5. temperatura;
   
   
2. In calcule:
   1. este necesar sa utilizam telefoanele;
   2. este necesar sa discutam cu colegii;
   3. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   4. este necesara stabilirea coeficientilor reactiei chimice;
   5. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   
   
3. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. toate sticlariile trebuie sa fie curat īnainte si dupa efectuarea experimentului;
   2. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   3. principiul conservarii numarul de atomi pentru fiecare element;
   4. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   
   
4. Urmatoarele reactii chimice au fost folosite īn experimente:
   1. KMnO₄ + H₂SO₄ -> K₂SO₄ + MnSO₄ + H₂O
   2. KMnO₄ + NaOH -> Na₂MnO₄ + KOH
   3. (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   4. H₂O + CO₂ -> H₂CO₃
   
   
5. Titrarea ca o operatiune de laborator implica:
   1. masurarea masei;
   2. masurarea volumului;
   3. o solutie de sare;
   4. o solutie de hidroxid de sodiu;
   5. amestecul a doua sau mai multe solutii;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. Titration as a laboratory operation involves:
   1. a burette;
   2. a volume measurement;
   3. a pH indicator that changes color depending on the pH of the solution;
   4. a pH-metter;
   
   
2. The indicator should be added:
   1. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   2. to indicate our safety limits when we dealt with chemicals;
   3. only at the suggestion of the supervisor;
   4. to provide a color change at equivalence point;
   
   
3. The equivalence point is:
   1. the point in which a reactive should be added in the burette;
   2. the point in which a reactive is fully consumed in the reaction;
   3. used to balance the equation;
   4. something rarely encountered in chemistry;
   
   
4. A redox process:
   1. is always fast and safe;
   2. is considered to be the following one: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. involves changing of the aggregation states of some participants to the reaction;
   4. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   
   
5. In the calculations:
   1. are necessary to discuss with our colleagues;
   2. are necessary to take the results imediatly after these are available from others;
   3. are necessary to use our phones;
   4. are necessary to use some formulas expressing in different ways the concentration;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Titrarea ca o operatiune de laborator implica:
   1. o biureta;
   2. masurarea volumului;
   3. un indicator de pH care īsi schimba culoarea īn functie de pH-ul solutiei;
   4. un pH-metru;
   5. un standard sau reactiv de referinta;
   
   
2. Trebuie adaugat indicatorul:
   1. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   2. pentru a indica limitele noastre de siguranta, atunci cānd ne ocupam cu substante chimice;
   3. numai la sugestia supraveghetorului;
   4. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   
   
3. Punctul de echivalenta este:
   1. punctul īn care ar trebui sa fie adaugat un reactiv īn biureta;
   2. punctul īn care un reactiv este consumat complet īn reactie;
   3. folosit pentru a echilibra ecuatia;
   4. ceva rar īntālnit īn chimie;
   
   
4. Un proces redox:
   1. este īntotdeauna rapid si sigur;
   2. este considerat a fi urmatorul: KMnO₄ + (COOH)₂ + H₂SO₄ -> K₂SO₄ + MnSO₄ + CO₂ + H₂O
   3. implica schimbarea a starilor de agregare ale unor participanti la reactie;
   4. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   5. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   
   
5. In calcule:
   1. este necesar sa discutam cu colegii;
   2. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   3. este necesar sa utilizam telefoanele;
   4. este necesar sa utilizam unele formule care exprima īn moduri diferite concentratia;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. The density of the solutions depends on:
   1. pressure;
   2. temperature;
   3. time elapsed since were prepared;
   4. provider;
   
   
2. When a chemical reaction is balanced, following should be considered:
   1. the principle of the conservation of the energy;
   2. the liquid in the burette should be at the same level before and after conducting the experiment;
   3. the principle of the conservation of the number of atoms for each element;
   4. all glassware should be clean before, after and during the experiment;
   
   
3. 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. indicated when a color change is observed into the solution;
   
   
4. The indicator should be added:
   1. to provide a color change at equivalence point;
   2. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   3. only at the suggestion of the supervisor;
   4. only in special cases, when the burette is graded from its bottom to its top;
   
   
5. Titration as a laboratory operation involves:
   1. a standard or referential reactive;
   2. a natrium hydroxide solution;
   3. an mixing of two ore more solutions;
   4. a pH-metter;
   
   

TEST DE FINAL DE LABORATOR
Studiul reactiilor chimice

1. Densitatea solutiilor depinde de:
   1. presiune;
   2. temperatura;
   3. timpul scurs de cand au fost pregatite;
   4. furnizor;
   5. concentratie;
   
   
2. Cānd o reactie chimica este echilibrat, ar trebui sa fie luate īn considerare urmatoarele:
   1. principiul conservarii energiei;
   2. lichidul din biureta ar trebui sa fie la acelasi nivel, īnainte si dupa efectuarea experimentului;
   3. principiul conservarii numarul de atomi pentru fiecare element;
   4. toate sticlariile trebuie sa fie curat īnainte, dupa, si īn timpul experimentului;
   5. principiul conservarii volumului;
   
   
3. 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. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   5. ceva rar īntālnit īn chimie;
   
   
4. Trebuie adaugat indicatorul:
   1. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   2. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   3. numai la sugestia supraveghetorului;
   4. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   
   
5. Titrarea ca o operatiune de laborator implica:
   1. un standard sau reactiv de referinta;
   2. o solutie de hidroxid de sodiu;
   3. amestecul a doua sau mai multe solutii;
   4. un pH-metru;
   5. masurarea volumului;
   
   

FINAL TEST AT LABORATORY
Study of chemical reactions

1. In the calculations:
   1. are necessary to use our phones;
   2. are necessary to draw the tables in our notebooks after completing of the experiment;
   3. are necessary to establish the coefficients of the chemical reaction;
   4. are necessary to take the results imediatly after these are available from others;
   
   
2. Titration as a laboratory operation involves:
   1. a natrium hydroxide solution;
   2. a burette;
   3. a sulphuric acid solution;
   4. a volume measurement;
   
   
3. The indicator should be added:
   1. to provide a color change at equivalence point;
   2. to be able to use the chemical reaction for the calculation of corresponding quantities of reactives;
   3. only in special cases, when the burette is graded from its bottom to its top;
   4. in small quantities, to avoid the errors in observations and in calculations;
   
   
4. The equivalence point is:
   1. something rarely encountered in chemistry;
   2. the point in which a reactive should be added in the reaction flask;
   3. indicated when a color change is observed into the solution;
   4. used to balance the equation;
   
   
5. A redox process:
   1. is considered to be the following one: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. is considered to be the following one: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. involves changing of the aggregation 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. In calcule:
   1. este necesar sa utilizam telefoanele;
   2. este necesar sa desenam tabelele in caiete dupa finalizarea experimentului;
   3. este necesara stabilirea coeficientilor reactiei chimice;
   4. este necesar sa luam rezultatele imediat ce acestea devin disponibile de la colegii nostrii;
   5. este necesar a se lua unele informatii de pe sticlele de reactivi;
   
   
2. Titrarea ca o operatiune de laborator implica:
   1. o solutie de hidroxid de sodiu;
   2. o biureta;
   3. o solutie de acid sulfuric;
   4. masurarea volumului;
   5. masurarea masei;
   
   
3. Trebuie adaugat indicatorul:
   1. pentru a oferi o schimbare de culoare la punctul de echivalenta;
   2. pentru a putea utiliza reactia chimica in calculul cantitatilor de reactivi corespunzatoare;
   3. numai īn cazuri speciale, atunci cānd este biureta gradata de jos in sus;
   4. īn cantitati mici, pentru a evita erorile īn observatii si īn calculele;
   
   
4. Punctul de echivalenta este:
   1. ceva rar īntālnit īn chimie;
   2. punctul īn care ar trebui sa fie adaugat un reactiv īn balonul de reactie;
   3. indicat atunci cānd o schimbare de culoare se observa īn solutie;
   4. folosit pentru a echilibra ecuatia;
   
   
5. Un proces redox:
   1. este considerat a fi urmatorul: H₂SO₄ + NaOH -> Na₂SO₄ + H₂O
   2. este considerat a fi urmatorul: (COOH)₂ + NaOH -> (COONa)₂ + H₂O
   3. implica schimbarea a starilor de agregare ale unor participanti la reactie;
   4. implica un transfer de electroni de la un atom sau grup de atomi la altul;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. In the laboratory the water were:
   1. hardened using the resin column;
   2. softened using the resin column;
   3. complexed by using EDTA titrimetric method;
   4. biologically purified using the resin column;
   
   
2. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CH₃COO^- -> CH₃COONa + HO^-
   2. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   3. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   4. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   
   
3. EDTA is used:
   1. for safety precautions purposes;
   2. for recharging of the resin for water softening;
   3. for indication of the equilibrium point in the reaction;
   4. for complexing of Na¹⁺ and K¹⁺ ions;
   
   
4. For a water sample following measures may be quantitatively expressed:
   1. color;
   2. hardness;
   3. mineral acidity;
   4. total alkalinity;
   
   
5. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + CO₃^2- -> HCO₃^- + Cl^-
   2. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   3. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   4. HCl + HO^- -> H₂O + Cl^-
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. In laborator apa au fost:
   1. calita folosind coloana de rasina;
   2. dedurizata folosind coloana de rasina;
   3. complexata prin metoda titrimetrica EDTA;
   4. purificata biologic utilizānd coloana de rasina;
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   2. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   3. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   4. NaOH + CO₃^2- -> HCO₃^- + HO^-
   
   
3. EDTA este utilizat:
   1. ca masura de siguranta;
   2. pentru reīncarcarea rasinii la dedurizarea apei;
   3. pentru indicarea punctului de echilibru īn reactie;
   4. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   5. ca reactiv pentru determinarea duritatii apei;
   
   
4. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. culoare;
   2. duritate;
   3. aciditate minerala;
   4. alcalinitate totala;
   5. alcalinitate permanenta;
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + CO₃^2- -> HCO₃^- + Cl^-
   2. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   3. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   4. HCl + HO^- -> H₂O+Cl^-
   5. 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 alkalinity:
   1. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   2. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   3. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   4. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   
   
2. EDTA is used:
   1. for recharging of the resin for water softening;
   2. for indication of the equilibrium point in the reaction;
   3. for safety precautions purposes;
   4. for complexing of Na¹⁺ and K¹⁺ ions;
   
   
3. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + Cl^- -> NaCl + HO^-
   3. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   4. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   
   
4. For a water sample following measures may be quantitatively expressed:
   1. hardness;
   2. total acidity;
   3. mineral acidity;
   4. color;
   
   
5. We may say the followings:
   1. water is a good polar solvent;
   2. water is pure only when is taken from a good freshwater mountain stream;
   3. purification of the water may include chemical processes;
   4. water is good for drinking, it is nothing to be analysed;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   2. HCl + PO₄^3- -> H₂PO₄^- + Cl^-
   3. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   4. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   5. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   
   
2. EDTA este utilizat:
   1. pentru reīncarcarea rasinii la dedurizarea apei;
   2. pentru indicarea punctului de echilibru īn reactie;
   3. ca masura de siguranta;
   4. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   2. NaOH + Cl^- -> NaCl + HO^-
   3. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   4. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   5. NaOH + NO₃^- -> NaNO₃ + HO^-
   
   
4. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. duritate;
   2. aciditate totala;
   3. aciditate minerala;
   4. culoare;
   
   
5. Putem spune urmatoarele:
   1. apa este un solvent polar bun;
   2. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   3. purificarea apei poate include procese chimice;
   4. apa este buna pentru consum, nu este nimic de a fi analizat;
   5. purificarea apei poate include procedee fizice;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   2. NaOH + NO₃^- -> NaNO₃ + HO^-
   3. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   4. NaOH + Cl⁺ -> NaCl + HO⁺
   
   
2. In the laboratory the water were:
   1. complexed by using EDTA titrimetric method;
   2. biologically purified using the resin column;
   3. hardened using the resin column;
   4. acidified for drinking purposes;
   
   
3. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   2. HCl + CO₃^2- -> HCO₃^- + Cl^-
   3. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   4. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   
   
4. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   2. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   3. NaOH + HCOO⁺ -> HCOONa + HO⁺
   4. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   
   
5. For a water sample following measures may be quantitatively expressed:
   1. total alkalinity;
   2. total acidity;
   3. mineral acidity;
   4. permanent alkalinity;
   
   

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 + NO₃⁺ -> NaNO₃ + HO⁺
   2. NaOH + NO₃^- -> NaNO₃ + HO^-
   3. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   4. NaOH + Cl⁺ -> NaCl + HO⁺
   
   
2. In laborator apa au fost:
   1. complexata prin metoda titrimetrica EDTA;
   2. purificata biologic utilizānd coloana de rasina;
   3. calita folosind coloana de rasina;
   4. acidulata pentru baut;
   5. alcalinizeaza pentru baut;
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   2. HCl + CO₃^2- -> HCO₃^- + Cl^-
   3. HCl + PO₄^3- -> HPO₄^2- + Cl^-
   4. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   
   
4. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   2. NaOH + CO₃^2- -> HCO₃^- + HO^-
   3. NaOH + HCOO⁺ -> HCOONa + HO⁺
   4. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   5. NaOH + Cu²⁺ -> Cu(OH)₂ + Na⁺
   
   
5. Pentru o proba de apa urmatoarele masuri pot fi exprimate cantitativ:
   1. alcalinitate totala;
   2. aciditate totala;
   3. aciditate minerala;
   4. alcalinitate permanenta;
   
   

FINAL TEST AT LABORATORY
Water analysis

1. We may say the followings:
   1. water is good for drinking, it is nothing to be analysed;
   2. purification of the water may include chemical processes;
   3. natural water may contain organic matter and living organisms;
   4. purification of the water may include labeling processes;
   
   
2. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + NO₃^- -> NaNO₃ + HO^-
   2. NaOH + Cl⁺ -> NaCl + HO⁺
   3. NaOH + Cl^- -> NaCl + HO^-
   4. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   
   
3. In the laboratory were analyzed:
   1. the concentration of the water;
   2. the solubility of the water;
   3. the mass of the water;
   4. the color of the water;
   
   
4. In the laboratory the water were:
   1. acidified for drinking purposes;
   2. softened using the resin column;
   3. alkalinized for drinking purposes;
   4. hardened using the resin column;
   
   
5. Following reactions may tok place when we analyse a sample of water for total acidity:
   1. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   2. NaOH + CO₃^2- -> NaHCO₃^- + HO^-
   3. NaOH + CO₃²⁺ -> NaHCO₃⁺ + HO⁺
   4. NaOH + HCOO⁺ -> HCOONa + HO⁺
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Putem spune urmatoarele:
   1. apa este buna pentru consum, nu este nimic de a fi analizat;
   2. purificarea apei poate include procese chimice;
   3. apa naturala poate contine materie organica si organisme vii;
   4. purificarea apei poate include procesele de etichetare;
   5. purificarea apei poate include procese biologice;
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + NO₃^- -> NaNO₃ + HO^-
   2. NaOH + Cl⁺ -> NaCl + HO⁺
   3. NaOH + Cl^- -> NaCl + HO^-
   4. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   5. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   
   
3. Īn laborator au fost analizate:
   1. concentratia apei;
   2. solubilitatea apei;
   3. masa apei;
   4. culoarea apei;
   
   
4. In laborator apa au fost:
   1. acidulata pentru baut;
   2. dedurizata folosind coloana de rasina;
   3. alcalinizeaza pentru baut;
   4. calita folosind coloana de rasina;
   
   
5. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate totala:
   1. NaOH + CH₃COO⁺ -> CH₃COONa + HO⁺
   2. NaOH + CO₃^2- -> HCO₃^- + HO^-
   3. NaOH + CO₃²⁺ -> HCO₃⁺ + HO⁺
   4. NaOH + HCOO⁺ -> HCOONa + HO⁺
   5. NaOH + CH₃COO^- -> CH₃COONa+HO^-
   
   

FINAL TEST AT LABORATORY
Water analysis

1. Following reactions may tok place when we analyse a sample of water for partial alkalinity:
   1. HCl + HO^- -> H₂O + Cl^-
   2. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + CO₃^2- -> HCO₃^- + Cl^-
   
   
2. Following reactions may tok place when we analyse a sample of water for total alkalinity:
   1. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   2. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   3. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   4. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   
   
3. Following reactions may tok place when we analyse a sample of water for mineral acidity:
   1. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   2. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   3. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   4. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   
   
4. We may say the followings:
   1. purification of the water may include biological processes;
   2. water is pure only when is taken from a good freshwater mountain stream;
   3. purification of the water may include physical processes;
   4. natural water may contain organic matter and living organisms;
   
   
5. EDTA is used:
   1. for indication of the equilibrium point in the reaction;
   2. for complexing of Na¹⁺ and K¹⁺ ions;
   3. for complexing of Ca²⁺ and Mg²⁺ ions;
   4. for safety precautions purposes;
   
   

TEST DE FINAL DE LABORATOR
Analiza apei

1. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate partiala:
   1. HCl + HO^- -> H₂O+Cl^-
   2. HCl + CO₃²⁺ -> HCO₃⁺ + Cl⁺
   3. HCl + HO⁺ -> H₂O + Cl⁺
   4. HCl + CO₃^2- -> HCO₃^- + Cl^-
   5. HCl + PO₄³⁺ -> HPO₄²⁺ + Cl⁺
   
   
2. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru alcalinitate totala:
   1. HCl + CO₃^2- -> H₂CO₃ + Cl^-
   2. HCl + CO₃²⁺ -> H₂CO₃ + Cl⁺
   3. HCl + PO₄³⁺ -> H₂PO₄⁺ + Cl⁺
   4. NaOH + Ni²⁺ -> Ni(OH)₂ + Na⁺
   5. HCl + HO^- -> H₂O + Cl^-
   
   
3. Urmatoarele reactii pot avea loc atunci cānd analizam un esantion de apa pentru aciditate minerala:
   1. NaOH + NO₃⁺ -> NaNO₃ + HO⁺
   2. NaOH + SO₄^2- -> Na₂SO₄ + HO^-
   3. NaOH + Zn²⁺ -> Zn(OH)₂ + Na⁺
   4. NaOH + SO₄²⁺ -> Na₂SO₄ + HO⁺
   5. NaOH + NO₃^- -> NaNO₃ + HO^-
   
   
4. Putem spune urmatoarele:
   1. purificarea apei poate include procese biologice;
   2. apa este pura doar atunci cānd este luata dintr-un bun izvor de munte de apa dulce;
   3. purificarea apei poate include procedee fizice;
   4. apa naturala poate contine materie organica si organisme vii;
   5. purificarea apei poate include procesele de etichetare;
   
   
5. EDTA este utilizat:
   1. pentru indicarea punctului de echilibru īn reactie;
   2. pentru complexarea ionilor de Na^{1 +}si K^{1 +};
   3. pentru complexarea ionilor de Ca^{2 +}si Mg^{2 +};
   4. ca masura de siguranta;
   
   

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

1. The zinc plate:
   1. the volume is measured before and after immersing it in H₂SO₄;
   2. was involved in the volumetric method of corrosion analysis
   3. the surface is measured before and after immersing it in H₂SO₄;
   4. was involved in the gravimetric method of corrosion analysis
   
   
2. Corrosion of metals:
   1. can be reduced by passivation;
   2. is the destruction of metals under the action of external factors;
   3. takes place merely from exposure to moisture in air;
   4. is helping in the process of cleaning the metals surfaces;
   
   
3. Which of the following reactions may be called as of corrosion:
   1. H⁺ + Fe -> H₂ + Fe²⁺
   2. H⁺ + Zn -> H₂ + Zn²⁺
   3. ZnO + CO -> Zn + CO₂
   4. Fe₂O₃ + CO -> Fe + CO₂
   
   
4. In studied corrosion processes:
   1. a gas is released only the corrosion of aluminum;
   2. the metal it changes its oxidation state becoming an cation;
   3. always the metal changes its oxidation state;
   4. a gas is released only the corrosion of zinc;
   
   
5. 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 involved in the gravimetric method of corrosion analysis
   3. was involved in the volumetric method of corrosion analysis
   4. the surface is measured before and after immersing it in NaOH;
   
   

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

1. Pentru placa de zinc:
   1. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   2. a fost implicata īn metoda volumetrica de analiza a coroziunii
   3. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   5. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   
   
2. Coroziunea metalelor:
   1. poate fi redusa prin pasivare;
   2. este distrugerea metalelor sub actiunea factorilor externi;
   3. are loc pur si simplu prin expunerea la umiditate īn aer;
   4. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   
   
3. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H⁺ + Fe -> H₂ + Fe²⁺
   2. H⁺ + Zn -> H₂ + Zn²⁺
   3. ZnO + CO -> Zn + CO₂
   4. Fe₂O₃ + CO -> Fe + CO₂
   5. H⁺ + Ni -> H₂ + Ni²⁺
   
   
4. 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 cation;
   3. īntotdeauna metalul isi schimba starea de oxidare;
   4. un gaz este eliberat numai la corodarea zincului;
   5. metalul isi schimba starea de oxidare pentru a deveni un anion;
   
   
5. Pentru placa de aluminiu:
   1. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. a fost implicata īn metoda volumetrica de analiza a coroziunii
   4. suprafata se masoara īnainte si dupa imersia īn NaOH;
   5. a fost corodata īn solutie de hidroxid de sodiu;
   
   

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

1. Which of the following reactions may be called as of corrosion:
   1. Ni(CO)₄ -> Ni + CO
   2. H⁺ + Zn -> H₂ + Zn²⁺
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. Fe₂O₃ + CO -> Fe + CO₂
   
   
2. The aluminum plate:
   1. was corroded in sodium hydroxide solution;
   2. was involved in the volumetric method of corrosion analysis
   3. the surface is measured before and after immersing it in NaOH;
   4. the volume is measured before and after immersing it in NaOH;
   
   
3. Corrosion of metals:
   1. is the protection in time to chemical agents;
   2. is helping in the process of cleaning the metals surfaces;
   3. is a beneficial process that shows the stability of metals;
   4. can be reduced by passivation;
   
   
4. In studied corrosion processes:
   1. a gas is released only the corrosion of zinc;
   2. the metal it changes its oxidation state becoming an cation;
   3. when a gas is released its volume depends on the amount of metal corroded;
   4. a gas is released at both corrosion of zinc and aluminum;
   
   
5. The zinc plate:
   1. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   2. was corroded in sulfuric solution;
   3. was degreased in sulfuric acid solution;
   4. the volume is measured before and after immersing it in H₂SO₄;
   
   

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

1. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Ni(CO)₄ -> Ni + CO
   2. H⁺ + Zn -> H₂ + Zn²⁺
   3. H₂O + HO^- + Al -> H₂ + Al(OH)₄^-
   4. Fe₂O₃ + CO -> Fe + CO₂
   5. H⁺ + Ni -> H₂ + Ni²⁺
   
   
2. Pentru placa de aluminiu:
   1. a fost corodata īn solutie de hidroxid de sodiu;
   2. a fost implicata īn metoda volumetrica de analiza a coroziunii
   3. suprafata se masoara īnainte si dupa imersia īn NaOH;
   4. volumul se masoara īnainte si dupa imersia īn NaOH;
   
   
3. Coroziunea metalelor:
   1. este protectia de durata impotriva agentilor chimici;
   2. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   3. este un proces benefic care arata stabilitatea metalelor;
   4. poate fi redusa prin pasivare;
   5. are loc pur si simplu prin expunerea la umiditate īn aer;
   
   
4. Īn procesele de coroziune studiate:
   1. un gaz este eliberat numai la corodarea zincului;
   2. metalul isi schimba starea de oxidare pentru a deveni un cation;
   3. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   4. un gaz este eliberat la ambele coroziuni ale zincului si aluminiului;
   5. metalul isi schimba starea de oxidare pentru a deveni un anion;
   
   
5. Pentru placa de zinc:
   1. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   2. a fost corodata īn solutie sulfuric;
   3. a fost degresata īn solutie de acid sulfuric;
   4. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   
   

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

1. Which of the following reactions may be called as of corrosion:
   1. Ni(CO)₄ -> Ni + CO
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   4. ZnO + CO -> Zn + CO₂
   
   
2. Corrosion of metals:
   1. takes place merely from exposure to moisture in air;
   2. may provide useful raw materials for analysis;
   3. can be reduced by electroplating;
   4. can be reduced by passivation;
   
   
3. The zinc plate:
   1. was degreased in sulfuric acid solution;
   2. was involved in the gravimetric method of corrosion analysis
   3. was corroded in sulfuric solution;
   4. the surface is measured before and after immersing it in H₂SO₄;
   
   
4. In studied corrosion processes:
   1. always the metal changes its oxidation state;
   2. a gas is released only the corrosion of aluminum;
   3. the metal it changes its oxidation state becoming an cation;
   4. when a gas is released its volume depends on the amount of metal corroded;
   
   
5. The aluminum plate:
   1. was corroded in sodium hydroxide solution;
   2. the volume is measured before and after immersing it in NaOH;
   3. was involved in the gravimetric method of corrosion analysis
   4. the mass is measured before and after immersing it in NaOH;
   
   

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

1. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. Ni(CO)₄ -> Ni + CO
   2. H⁺ + Fe -> H₂ + Fe²⁺
   3. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   4. ZnO + CO -> Zn + CO₂
   5. H⁺ + Ni -> H₂ + Ni²⁺
   
   
2. Coroziunea metalelor:
   1. are loc pur si simplu prin expunerea la umiditate īn aer;
   2. poate furniza materii prime utile pentru analiza;
   3. poate fi redusa prin galvanizare;
   4. poate fi redusa prin pasivare;
   
   
3. Pentru placa de zinc:
   1. a fost degresata īn solutie de acid sulfuric;
   2. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   3. a fost corodata īn solutie sulfuric;
   4. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   5. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   
   
4. Īn procesele de coroziune studiate:
   1. īntotdeauna metalul isi schimba starea de oxidare;
   2. un gaz este eliberat numai la corodarea aluminiului;
   3. metalul isi schimba starea de oxidare pentru a deveni un cation;
   4. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   5. metalul isi schimba starea de oxidare pentru a deveni un anion;
   
   
5. 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. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   4. masa este masurata īnainte si dupa imersia īn NaOH;
   5. 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. In studied corrosion processes:
   1. always the metal changes its oxidation state;
   2. when a gas is released its volume depends on the amount of metal corroded;
   3. a gas is released only the corrosion of aluminum;
   4. the metal it changes its oxidation state becoming an cation;
   
   
2. Which of the following reactions may be called as of corrosion:
   1. H⁺ + Fe -> H₂ + Fe²⁺
   2. Ni(CO)₄ -> Ni + CO
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
3. Corrosion of metals:
   1. is helping in the process of cleaning the metals surfaces;
   2. takes place merely from exposure to moisture in air;
   3. can be reduced by electroplating;
   4. can be reduced by passivation;
   
   
4. The aluminum plate:
   1. was involved in the gravimetric method of corrosion analysis
   2. the surface is measured before and after immersing it in NaOH;
   3. the volume is measured before and after immersing it in NaOH;
   4. the mass is measured before and after immersing it in NaOH;
   
   
5. The zinc plate:
   1. was involved in the volumetric method of corrosion analysis
   2. the mass is measured before and after immersing it in H₂SO₄;
   3. was involved in the gravimetric method of corrosion analysis
   4. the surface is measured before and after immersing it in H₂SO₄;
   
   

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

1. Īn procesele de coroziune studiate:
   1. īntotdeauna metalul isi schimba starea de oxidare;
   2. atunci cānd un gaz este eliberat volumul sau depinde de cantitatea de metal corodat;
   3. un gaz este eliberat numai la corodarea aluminiului;
   4. metalul isi schimba starea de oxidare pentru a deveni un cation;
   
   
2. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H⁺ + Fe -> H₂ + Fe²⁺
   2. Ni(CO)₄ -> Ni + CO
   3. H⁺ + Ni -> H₂ + Ni²⁺
   4. Al₂O₃ + NaOH -> NaAlO₂
   
   
3. Coroziunea metalelor:
   1. este de ajutor īn procesul de curatare a suprafetelor metalelor;
   2. are loc pur si simplu prin expunerea la umiditate īn aer;
   3. poate fi redusa prin galvanizare;
   4. poate fi redusa prin pasivare;
   
   
4. Pentru placa de aluminiu:
   1. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   2. suprafata se masoara īnainte si dupa imersia īn NaOH;
   3. volumul se masoara īnainte si dupa imersia īn NaOH;
   4. masa este masurata īnainte si dupa imersia īn NaOH;
   5. a fost degresata īn solutie de hidroxid de sodiu;
   
   
5. Pentru placa de zinc:
   1. a fost implicata īn metoda volumetrica de analiza a coroziunii
   2. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   3. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   4. suprafata se masoara īnainte si dupa imersia īn H₂SO₄;
   5. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   
   

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

1. The aluminum plate:
   1. the volume is measured before and after immersing it in NaOH;
   2. was corroded in sodium hydroxide solution;
   3. was degreased in sodium hydroxide solution;
   4. was involved in the volumetric method of corrosion analysis
   
   
2. Which of the following reactions may be called as of corrosion:
   1. H⁺ + Ni -> H₂ + Ni²⁺
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
3. In studied corrosion processes:
   1. the metal it changes its oxidation state becoming an cation;
   2. a gas is released only the corrosion of zinc;
   3. always the metal changes its oxidation state;
   4. a gas is released only the corrosion of aluminum;
   
   
4. The zinc plate:
   1. was corroded in sulfuric solution;
   2. the volume is measured before and after immersing it in H₂SO₄;
   3. is expected to have approximately the same mass at the end of the semester as at the beginning of it;
   4. was involved in the gravimetric method of corrosion analysis
   
   
5. Corrosion of metals:
   1. can be reduced by electroplating;
   2. takes place merely from exposure to moisture in air;
   3. may provide useful raw materials for analysis;
   4. is a beneficial process that shows the stability of metals;
   
   

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

1. Pentru placa de aluminiu:
   1. volumul se masoara īnainte si dupa imersia īn NaOH;
   2. a fost corodata īn solutie de hidroxid de sodiu;
   3. a fost degresata īn solutie de hidroxid de sodiu;
   4. a fost implicata īn metoda volumetrica de analiza a coroziunii
   
   
2. Care dintre urmatoarele reactii pot fi numite ca fiind de coroziune:
   1. H⁺ + Ni -> H₂ + Ni²⁺
   2. Fe₂O₃ + CO -> Fe + CO₂
   3. H⁺ + Zn -> H₂ + Zn²⁺
   4. ZnO + H₂SO₄ -> ZnSO₄ + H₂O
   
   
3. Īn procesele de coroziune studiate:
   1. metalul isi schimba starea de oxidare pentru a deveni un cation;
   2. un gaz este eliberat numai la corodarea zincului;
   3. īntotdeauna metalul isi schimba starea de oxidare;
   4. un gaz este eliberat numai la corodarea aluminiului;
   
   
4. Pentru placa de zinc:
   1. a fost corodata īn solutie sulfuric;
   2. volumul se masoara īnainte si dupa imersia īn H₂SO₄;
   3. este de asteptat sa aiba aproximativ aceeasi masa la sfārsitul semestrului ca la īnceputul acestuia;
   4. a fost implicata īn metoda gravimetrica de analiza a coroziunii
   5. masa este masurata īnainte si dupa imersia īn H₂SO₄;
   
   
5. Coroziunea metalelor:
   1. poate fi redusa prin galvanizare;
   2. are loc pur si simplu prin expunerea la umiditate īn aer;
   3. poate furniza materii prime utile pentru analiza;
   4. este un proces benefic care arata stabilitatea metalelor;
   5. este distrugerea metalelor sub actiunea factorilor externi;
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

1. Theoretical mass of nickel deposited is calculated using:
   1. law of mass action;
   2. solutions laws;
   3. the conservation of the energy law;
   4. the electrolysis law;
   
   
2. It is expected to have a mass of nickel deposited:
   1. inversely proportional with the surface of the sample;
   2. inversely proportional with the intensity of the current used;
   3. lower than the calculated theoretical one;
   4. proportional with the nickel plating time;
   
   
3. The intensity of the current:
   1. is to be calculated after conducting the experiment;
   2. is to be adjusted when the experiment starts;
   3. affect only the quality of the nickel deposition;
   4. it depends on the surface of the sample;
   
   
4. Electrical conductivity of nickel salts solutions:
   1. is improved by salts additions;
   2. depends on the potential of the source used;
   3. depends on the intensity of the current used;
   4. is reduced by salts additions;
   
   
5. At the nickel plating following reactions took place:
   1. at high densities of current oxygen anions (O^2-) have the tendency to discharge at the cathode: O^2- - 2e^- -> O₂⁰
   2. at cathode (-), connected with metallic piece, Ni²⁺ + 2e^- -> Ni⁰
   3. at 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. Masa teoretica de nichel depus se calculeaza folosind:
   1. legea actiunii maselor;
   2. legea solutilor;
   3. legea conservarii energiei;
   4. legea electrolizei;
   5. conservarea numarului de atomi pentru fiecare element;
   
   
2. Este de asteptat ca masa de nichel depus sa fie:
   1. invers proportionala cu suprafata probei;
   2. invers proportionala cu intensitatea curentului utilizat;
   3. mai mica decāt cea teoretica calculata;
   4. proportionala cu timpul de nichelare;
   5. proportionala cu suprafata probei;
   
   
3. Intensitatea curentului:
   1. se calculeaza dupa efectuarea experimentului;
   2. trebuie sa fie ajustata cand se incepe experimentul;
   3. afecteaza numai calitatea depunerii nichelului;
   4. depinde de suprafata probei;
   
   
4. Conductivitatea electrica a solutiilor de saruri de nichel:
   1. este īmbunatatita prin adaosuri de saruri;
   2. depinde de potentialul sursei utilizate;
   3. depinde de intensitatea curentului utilizat;
   4. este redusa prin adaosuri de saruri;
   5. este relativ mica;
   
   
5. La nichelare urmatoarele reactii au avut loc:
   1. la densitati mari de curent anionii de oxigen (O^2-) au tendinta de a descarca la catod: O^2- - 2e^- -> O₂⁰
   2. la catod (-), īn contact cu piesa metalica, Ni²⁺ + 2e^- -> Ni⁰
   3. la 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 anod (+), īn legatura cu piesa de nichel, Ni²⁺ + 2e^- -> Ni⁰
   
   

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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

FINAL TEST AT LABORATORY
Nickel corrosion protective electroplating

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

TEST DE FINAL DE LABORATOR
Electrodepunerea nichelului protectiva impotriva coroziunii

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