Final laboratory test

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Water analysis

  1. Water softening is based on passing the water on:
    1. fractionation columns;
    2. distillation columns;
    3. ion exchange columns;
    4. cooling columns;
  2. The acidity of the water is due to:
    1. only insoluble salts;
    2. free carbon dioxide, mineral acids and salts of strong acids with weak bases;
    3. all minerals dissolved in water;
    4. hydroxides from water;
  3. In order to determine the acidity of decationized water, the samples:
    1. are titrated with sulphuric acid in presence of ERIO T;
    2. are titrated with hydrochloric acid in presence of methyl orange;
    3. are titrated with natrium hydroxide in presence of phenolphthalein;
    4. none of the answers are correct;
  4. When is determining temporary hardness titration of water samples is made:
    1. with clorhidric acid in the presence of methyl orange until the appearance of orange color;
    2. with sodium hydroxide in the presence of phenolphthalein until the appearance of pink color;
    3. with sulphuric acid in the presence of methyl orange until the appearance of brown color;
    4. with potasium hydroxide;
  5. At the determination of total hardness in water sample:
    1. is formed a blue color complex after titration;
    2. ia added oxalic acid and then the sample is titrated with permanganate solution;
    3. just add ERIO T and titrate;
    4. is directly titrated with EDTA solution;

Final laboratory test

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Water analysis

  1. In order to determine the acidity of decationized water, the samples:
    1. none of the answers are correct;
    2. are titrated with hydrochloric acid in presence of methyl orange;
    3. are titrated with natrium hydroxide in presence of phenolphthalein;
    4. are titrated with sulphuric acid in presence of ERIO T;
  2. The experiment for the analysis of drinking water:
    1. was aimed, at the wareness of the risks to which we expose drinking tap water;
    2. was intended water purification;
    3. was aimed at determination of the cations from water
    4. was aimed at the determination of alkalinity;
  3. At the determination of total hardness in water sample:
    1. is directly titrated with EDTA solution;
    2. just add ERIO T and titrate;
    3. ia added oxalic acid and then the sample is titrated with permanganate solution;
    4. is formed a blue color complex after titration;
  4. Water softening is based on passing the water on:
    1. ion exchange columns;
    2. distillation columns;
    3. cooling columns;
    4. fractionation columns;
  5. At the titration of water samples:
    1. the burette reads only at the start of titration process;
    2. is added sulphuric acid in the samples;
    3. the burette reads before the start of titration and at the end of titration;
    4. does not need to be read the burette;

Final laboratory test

Do not use this paper to give answers!

Water analysis

  1. In order to determine the acidity of decationized water, the samples:
    1. are titrated with sulphuric acid in presence of ERIO T;
    2. none of the answers are correct;
    3. are titrated with hydrochloric acid in presence of methyl orange;
    4. are titrated with natrium hydroxide in presence of phenolphthalein;
  2. Water softening is based on passing the water on:
    1. cooling columns;
    2. fractionation columns;
    3. distillation columns;
    4. ion exchange columns;
  3. The experiment for the analysis of drinking water:
    1. was aimed at the determination of alkalinity;
    2. was intended water purification;
    3. was aimed, at the wareness of the risks to which we expose drinking tap water;
    4. was aimed at determination of the cations from water
  4. At the determination of total hardness in water sample:
    1. just add ERIO T and titrate;
    2. ia added oxalic acid and then the sample is titrated with permanganate solution;
    3. is formed a blue color complex after titration;
    4. is directly titrated with EDTA solution;
  5. When is determining temporary hardness titration of water samples is made:
    1. with sodium hydroxide in the presence of phenolphthalein until the appearance of pink color;
    2. with sulphuric acid in the presence of methyl orange until the appearance of brown color;
    3. with potasium hydroxide;
    4. with clorhidric acid in the presence of methyl orange until the appearance of orange color;

Final laboratory test

Do not use this paper to give answers!

Water analysis

  1. At the determination of total hardness in water sample:
    1. ia added oxalic acid and then the sample is titrated with permanganate solution;
    2. just add ERIO T and titrate;
    3. is directly titrated with EDTA solution;
    4. is formed a blue color complex after titration;
  2. Water softening is based on passing the water on:
    1. ion exchange columns;
    2. distillation columns;
    3. cooling columns;
    4. fractionation columns;
  3. When is determining temporary hardness titration of water samples is made:
    1. with clorhidric acid in the presence of methyl orange until the appearance of orange color;
    2. with potasium hydroxide;
    3. with sodium hydroxide in the presence of phenolphthalein until the appearance of pink color;
    4. with sulphuric acid in the presence of methyl orange until the appearance of brown color;
  4. The experiment for the analysis of drinking water:
    1. was aimed, at the wareness of the risks to which we expose drinking tap water;
    2. was aimed at the determination of alkalinity;
    3. was intended water purification;
    4. was aimed at determination of the cations from water
  5. In order to determine the acidity of decationized water, the samples:
    1. none of the answers are correct;
    2. are titrated with sulphuric acid in presence of ERIO T;
    3. are titrated with natrium hydroxide in presence of phenolphthalein;
    4. are titrated with hydrochloric acid in presence of methyl orange;

Final laboratory test

Do not use this paper to give answers!

Water analysis

  1. The experiment for the analysis of drinking water:
    1. was intended water purification;
    2. was aimed, at the wareness of the risks to which we expose drinking tap water;
    3. was aimed at determination of the cations from water
    4. was aimed at the determination of alkalinity;
  2. At the titration of water samples:
    1. the burette reads only at the start of titration process;
    2. does not need to be read the burette;
    3. the burette reads before the start of titration and at the end of titration;
    4. is added sulphuric acid in the samples;
  3. At the determination of total hardness in water sample:
    1. ia added oxalic acid and then the sample is titrated with permanganate solution;
    2. is formed a blue color complex after titration;
    3. just add ERIO T and titrate;
    4. is directly titrated with EDTA solution;
  4. In order to determine the acidity of decationized water, the samples:
    1. none of the answers are correct;
    2. are titrated with natrium hydroxide in presence of phenolphthalein;
    3. are titrated with sulphuric acid in presence of ERIO T;
    4. are titrated with hydrochloric acid in presence of methyl orange;
  5. Water softening is based on passing the water on:
    1. fractionation columns;
    2. ion exchange columns;
    3. cooling columns;
    4. distillation columns;

Final laboratory test

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Solution concentration

  1. Titration is a laboratory operation, which is performed in the presence of:
    1. natrium hydroxide;
    2. a salt;
    3. a pH indicator that changes color depending on the pH of the solution;
    4. sulphuric acid;
  2. The oxidation is the process of:
    1. donation of electrons, and increasing the oxidation number;
    2. acceptance of electrons, and decreasing the oxidation number;
    3. donation of electrons, and decreasing the oxidation number;
    4. acceptance of electrons, and increasing the oxidation number;
  3. Acid-base titration of the three samples of sulfuric acid with sodium hydroxide, is carried out until the appearance of:
    1. the orange color;
    2. the yellow color;
    3. none of the answers are correct;
    4. the dark-brown color;
  4. At the redox titration with potassium permanganate solution, the samples were heated for:
    1. has no effect;
    2. to stop the chemical reaction that occurs in the titration;
    3. decrease the reaction rate;
    4. trigger and speed up the reaction;
  5. Reactions between acids and bases:
    1. are always fast, taking place almost instantaneously;
    2. have as a consequence the dissolution of a salt;
    3. have as a consequence the formation of a quantity of water;
    4. are all exothermic;

Final laboratory test

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Solution concentration

  1. Changing the color of pH indicator shows that:
    1. resumption of titration;
    2. equivalent point;
    3. titration process should be continued;
    4. does not have any effect on the process of titration;
  2. In the calculation, of oxalic acid factor solution:
    1. its actual titer reads before and after the titration from the burette;
    2. it is not necessary to read the real titer;
    3. its actual titer reads from the reagent bottle label;
    4. its actual titer reads from the working procedure of laboratory work;
  3. The oxidation is the process of:
    1. acceptance of electrons, and decreasing the oxidation number;
    2. acceptance of electrons, and increasing the oxidation number;
    3. donation of electrons, and increasing the oxidation number;
    4. donation of electrons, and decreasing the oxidation number;
  4. Reactions between acids and bases:
    1. are always fast, taking place almost instantaneously;
    2. have as a consequence the formation of a quantity of water;
    3. are all exothermic;
    4. have as a consequence the dissolution of a salt;
  5. At the redox titration with potassium permanganate solution, the samples were heated for:
    1. trigger and speed up the reaction;
    2. has no effect;
    3. to stop the chemical reaction that occurs in the titration;
    4. decrease the reaction rate;

Final laboratory test

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Solution concentration

  1. Acid-base titration of the three samples of sulfuric acid with sodium hydroxide, is carried out until the appearance of:
    1. the orange color;
    2. none of the answers are correct;
    3. the dark-brown color;
    4. the yellow color;
  2. Reactions between acids and bases:
    1. are all exothermic;
    2. have as a consequence the dissolution of a salt;
    3. are always fast, taking place almost instantaneously;
    4. have as a consequence the formation of a quantity of water;
  3. Titration is a laboratory operation, which is performed in the presence of:
    1. natrium hydroxide;
    2. sulphuric acid;
    3. a pH indicator that changes color depending on the pH of the solution;
    4. a salt;
  4. In the calculation, of oxalic acid factor solution:
    1. it is not necessary to read the real titer;
    2. its actual titer reads from the working procedure of laboratory work;
    3. its actual titer reads before and after the titration from the burette;
    4. its actual titer reads from the reagent bottle label;
  5. At the redox titration with potassium permanganate solution, the samples were heated for:
    1. has no effect;
    2. decrease the reaction rate;
    3. trigger and speed up the reaction;
    4. to stop the chemical reaction that occurs in the titration;

Final laboratory test

Do not use this paper to give answers!

Solution concentration

  1. Titration is a laboratory operation, which is performed in the presence of:
    1. natrium hydroxide;
    2. sulphuric acid;
    3. a pH indicator that changes color depending on the pH of the solution;
    4. a salt;
  2. Reactions between acids and bases:
    1. have as a consequence the formation of a quantity of water;
    2. are all exothermic;
    3. have as a consequence the dissolution of a salt;
    4. are always fast, taking place almost instantaneously;
  3. Acid-base titration of the three samples of sulfuric acid with sodium hydroxide, is carried out until the appearance of:
    1. the yellow color;
    2. the orange color;
    3. the dark-brown color;
    4. none of the answers are correct;
  4. At the redox titration with potassium permanganate solution, the samples were heated for:
    1. decrease the reaction rate;
    2. to stop the chemical reaction that occurs in the titration;
    3. trigger and speed up the reaction;
    4. has no effect;
  5. Changing the color of pH indicator shows that:
    1. does not have any effect on the process of titration;
    2. equivalent point;
    3. resumption of titration;
    4. titration process should be continued;

Final laboratory test

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Solution concentration

  1. In the calculation, of oxalic acid factor solution:
    1. its actual titer reads from the reagent bottle label;
    2. its actual titer reads before and after the titration from the burette;
    3. its actual titer reads from the working procedure of laboratory work;
    4. it is not necessary to read the real titer;
  2. Titration is a laboratory operation, which is performed in the presence of:
    1. natrium hydroxide;
    2. a pH indicator that changes color depending on the pH of the solution;
    3. a salt;
    4. sulphuric acid;
  3. Reactions between acids and bases:
    1. are always fast, taking place almost instantaneously;
    2. have as a consequence the dissolution of a salt;
    3. are all exothermic;
    4. have as a consequence the formation of a quantity of water;
  4. The oxidation is the process of:
    1. acceptance of electrons, and decreasing the oxidation number;
    2. acceptance of electrons, and increasing the oxidation number;
    3. donation of electrons, and increasing the oxidation number;
    4. donation of electrons, and decreasing the oxidation number;
  5. At the redox titration with potassium permanganate solution, the samples were heated for:
    1. decrease the reaction rate;
    2. has no effect;
    3. trigger and speed up the reaction;
    4. to stop the chemical reaction that occurs in the titration;

Final laboratory test

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Metal corrosion

  1. In the gravimetric method, aluminum plate:
    1. is degreased in sodium hydroxide solution;
    2. is weighed before and after immersing it in NaOH;
    3. is not necessary, weighing the aluminum sample;
    4. is weight only after immersion;
  2. At the volumetric method:
    1. degrease the sample in sulfuric acid solution;
    2. is not required, weighing the sample of zinc;
    3. the sample size of zinc are measured, and then weighed the sample;
    4. weigh the zinc before and after the process takes place;
  3. When calculating the corrosion rate the surface is expressed in:
    1. m2;
    2. m3;;
    3. dm2;
    4. cm2;
  4. Corrosion of metals is:
    1. a beneficial process that shows the stability of metals;
    2. the destruction of metals under the action of external factors;
    3. the protection in time to chemical agents;
    4. the cleaning of metals;
  5. The corrosion rate is:
    1. variation of the sample mass, per unit time;
    2. variation of the sample mass per unit area;
    3. sample size variation per unit time;
    4. variation of the sample mass per unit area, per unit time;

Final laboratory test

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Metal corrosion

  1. Resistance grouping of the two samples studied in the laboratory is based on:
    1. their size, and time that are subject to chemical agents;
    2. their mass;
    3. the surface of the samples;
    4. the value of penetration index;
  2. In the gravimetric method, aluminum plate:
    1. is weighed before and after immersing it in NaOH;
    2. is not necessary, weighing the aluminum sample;
    3. is degreased in sodium hydroxide solution;
    4. is weight only after immersion;
  3. The corrosion rate is:
    1. sample size variation per unit time;
    2. variation of the sample mass, per unit time;
    3. variation of the sample mass per unit area;
    4. variation of the sample mass per unit area, per unit time;
  4. Corrosion of metals is:
    1. the destruction of metals under the action of external factors;
    2. a beneficial process that shows the stability of metals;
    3. the protection in time to chemical agents;
    4. the cleaning of metals;
  5. In corrosion processes studied gas is released:
    1. which is a volume that depends on the amount of metal corroded;
    2. only the corrosion of zinc;
    3. only the corrosion of aluminum;
    4. which is a volume that does not depend on the sample surface;

Final laboratory test

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Metal corrosion

  1. In corrosion processes studied gas is released:
    1. which is a volume that does not depend on the sample surface;
    2. only the corrosion of aluminum;
    3. which is a volume that depends on the amount of metal corroded;
    4. only the corrosion of zinc;
  2. The corrosion rate is:
    1. variation of the sample mass per unit area;
    2. variation of the sample mass per unit area, per unit time;
    3. sample size variation per unit time;
    4. variation of the sample mass, per unit time;
  3. In the gravimetric method, aluminum plate:
    1. is weighed before and after immersing it in NaOH;
    2. is weight only after immersion;
    3. is degreased in sodium hydroxide solution;
    4. is not necessary, weighing the aluminum sample;
  4. At the volumetric method:
    1. degrease the sample in sulfuric acid solution;
    2. weigh the zinc before and after the process takes place;
    3. is not required, weighing the sample of zinc;
    4. the sample size of zinc are measured, and then weighed the sample;
  5. Resistance grouping of the two samples studied in the laboratory is based on:
    1. the value of penetration index;
    2. their size, and time that are subject to chemical agents;
    3. the surface of the samples;
    4. their mass;

Final laboratory test

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Metal corrosion

  1. At the volumetric method:
    1. is not required, weighing the sample of zinc;
    2. weigh the zinc before and after the process takes place;
    3. degrease the sample in sulfuric acid solution;
    4. the sample size of zinc are measured, and then weighed the sample;
  2. When calculating the corrosion rate the surface is expressed in:
    1. cm2;
    2. dm2;
    3. m2;
    4. m3;;
  3. In the gravimetric method, aluminum plate:
    1. is weight only after immersion;
    2. is degreased in sodium hydroxide solution;
    3. is not necessary, weighing the aluminum sample;
    4. is weighed before and after immersing it in NaOH;
  4. Resistance grouping of the two samples studied in the laboratory is based on:
    1. their mass;
    2. their size, and time that are subject to chemical agents;
    3. the value of penetration index;
    4. the surface of the samples;
  5. In corrosion processes studied gas is released:
    1. only the corrosion of aluminum;
    2. which is a volume that does not depend on the sample surface;
    3. which is a volume that depends on the amount of metal corroded;
    4. only the corrosion of zinc;

Final laboratory test

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Metal corrosion

  1. In the gravimetric method, aluminum plate:
    1. is not necessary, weighing the aluminum sample;
    2. is weight only after immersion;
    3. is weighed before and after immersing it in NaOH;
    4. is degreased in sodium hydroxide solution;
  2. Corrosion of metals is:
    1. the destruction of metals under the action of external factors;
    2. the protection in time to chemical agents;
    3. the cleaning of metals;
    4. a beneficial process that shows the stability of metals;
  3. In corrosion processes studied gas is released:
    1. only the corrosion of zinc;
    2. which is a volume that does not depend on the sample surface;
    3. only the corrosion of aluminum;
    4. which is a volume that depends on the amount of metal corroded;
  4. Resistance grouping of the two samples studied in the laboratory is based on:
    1. their size, and time that are subject to chemical agents;
    2. the value of penetration index;
    3. their mass;
    4. the surface of the samples;
  5. The corrosion rate is:
    1. variation of the sample mass, per unit time;
    2. variation of the sample mass per unit area, per unit time;
    3. variation of the sample mass per unit area;
    4. sample size variation per unit time;

Final laboratory test

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Metal alloys analysis

  1. This method of analysis of metal alloys is:
    1. a nondestructive method of analysis;
    2. destructive method of analysis;
    3. a quantitative method of analysis;
    4. a gravimetric method of analysis;
  2. When identify aluminum, ammonium hydroxide was added:
    1. for removing the ions of Al3+;
    2. for stopping the reaction;
    3. for ensuring the necessary pH, for the reaction;
    4. for obtaining a red color complex;
  3. Why moisten the filter paper with solution of sodium nitrate?
    1. none of the answers are correct;
    2. for the paper work as insulation;
    3. to be cut easily with scissors;
    4. for stopping the chemical reaction that takes place;
  4. When identify lead, is obtain a:
    1. red-brown complex;
    2. yellow complex;
    3. blue complex;
    4. violet complex;
  5. The oxidation state, which pass into solution, analyzed metal ions are:
    1. Fe2+; Ni1+; Cu1+; Zn3+; Co2+; Cr6+
    2. Fe2+; Ni3+; Cu1+; Zn3+; Co3+; Cr2+
    3. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
    4. Fe3+; Ni2+; Cu2+; Zn2+; Co2+; Cr3+

Final laboratory test

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Metal alloys analysis

  1. The oxidation state, which pass into solution, analyzed metal ions are:
    1. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
    2. Fe2+; Ni3+; Cu1+; Zn3+; Co3+; Cr2+
    3. Fe3+; Ni2+; Cu2+; Zn2+; Co2+; Cr3+
    4. Fe2+; Ni1+; Cu1+; Zn3+; Co2+; Cr6+
  2. This method of analysis of metal alloys is:
    1. destructive method of analysis;
    2. a nondestructive method of analysis;
    3. a quantitative method of analysis;
    4. a gravimetric method of analysis;
  3. When identify lead, is obtain a:
    1. red-brown complex;
    2. violet complex;
    3. yellow complex;
    4. blue complex;
  4. The filter paper was acidified before analysis for:
    1. dissolution of hard soluble hydroxides;
    2. dissolution of acids;
    3. to complex the cations from the sample;
    4. to remove the cations from the analyzed sample;
  5. Why moisten the filter paper with solution of sodium nitrate?
    1. for the paper work as insulation;
    2. to be cut easily with scissors;
    3. none of the answers are correct;
    4. for stopping the chemical reaction that takes place;

Final laboratory test

Do not use this paper to give answers!

Metal alloys analysis

  1. Why moisten the filter paper with solution of sodium nitrate?
    1. for stopping the chemical reaction that takes place;
    2. none of the answers are correct;
    3. to be cut easily with scissors;
    4. for the paper work as insulation;
  2. The oxidation state, which pass into solution, analyzed metal ions are:
    1. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
    2. Fe2+; Ni1+; Cu1+; Zn3+; Co2+; Cr6+
    3. Fe3+; Ni2+; Cu2+; Zn2+; Co2+; Cr3+
    4. Fe2+; Ni3+; Cu1+; Zn3+; Co3+; Cr2+
  3. This method of analysis of metal alloys is:
    1. destructive method of analysis;
    2. a gravimetric method of analysis;
    3. a nondestructive method of analysis;
    4. a quantitative method of analysis;
  4. The filter paper was acidified before analysis for:
    1. dissolution of hard soluble hydroxides;
    2. to complex the cations from the sample;
    3. dissolution of acids;
    4. to remove the cations from the analyzed sample;
  5. When identify lead, is obtain a:
    1. red-brown complex;
    2. yellow complex;
    3. blue complex;
    4. violet complex;

Final laboratory test

Do not use this paper to give answers!

Metal alloys analysis

  1. This method of analysis of metal alloys is:
    1. a quantitative method of analysis;
    2. a nondestructive method of analysis;
    3. destructive method of analysis;
    4. a gravimetric method of analysis;
  2. When identify lead, is obtain a:
    1. violet complex;
    2. red-brown complex;
    3. yellow complex;
    4. blue complex;
  3. Why moisten the filter paper with solution of sodium nitrate?
    1. for stopping the chemical reaction that takes place;
    2. for the paper work as insulation;
    3. to be cut easily with scissors;
    4. none of the answers are correct;
  4. The electrograf consists of:
    1. none of the answers are correct;
    2. current source and the sample;
    3. filter paper and the sample;
    4. current source and the filter paper;
  5. The oxidation state, which pass into solution, analyzed metal ions are:
    1. Fe3+; Ni2+; Cu2+; Zn2+; Co2+; Cr3+
    2. Fe2+; Ni1+; Cu1+; Zn3+; Co2+; Cr6+
    3. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
    4. Fe2+; Ni3+; Cu1+; Zn3+; Co3+; Cr2+

Final laboratory test

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Metal alloys analysis

  1. When identify lead, is obtain a:
    1. blue complex;
    2. red-brown complex;
    3. yellow complex;
    4. violet complex;
  2. The electrograf consists of:
    1. current source and the sample;
    2. filter paper and the sample;
    3. none of the answers are correct;
    4. current source and the filter paper;
  3. When identify aluminum, ammonium hydroxide was added:
    1. for obtaining a red color complex;
    2. for stopping the reaction;
    3. for ensuring the necessary pH, for the reaction;
    4. for removing the ions of Al3+;
  4. Why moisten the filter paper with solution of sodium nitrate?
    1. none of the answers are correct;
    2. for stopping the chemical reaction that takes place;
    3. for the paper work as insulation;
    4. to be cut easily with scissors;
  5. This method of analysis of metal alloys is:
    1. a quantitative method of analysis;
    2. destructive method of analysis;
    3. a gravimetric method of analysis;
    4. a nondestructive method of analysis;

Final laboratory test

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Protection of metals by nickelling

  1. When is submitted the sample to the electrolysis process, this:
    1. degreasing is not necessary because the oil stains do not affect the electrolysis process;
    2. is introduced in natrium chloride for degreasing;
    3. is introduced in milk of lime solution for degreasing;
    4. is inserted into sulfuric acid, to clean;
  2. An electrolysis cell consists of:
    1. two electrodes and filter paper;
    2. the anode, cathode, and samples;
    3. analysis samples and electrolyte solution;
    4. the anode, cathode, electrolyte solution, current source;
  3. In the experiment of nickelling:
    1. iron from the cathode move in solution, replacing the nickel to be deposited;
    2. nickel sulfate solution is weakly electrically conductive;
    3. nickel anode is consumed;
    4. with as nickel sulfate solution is more concentrated, the more nickel is deposited on the cathode;
  4. In order to determine porosity:
    1. steel sample is cleaned with filter paper;
    2. degrease steel plate in potassium chloride;
    3. include pores of the filter paper obtained by contact with steel plate;
    4. steel plate weigh;
  5. To determine the current efficiency, brass plate:
    1. it is not required, weighing the plate because is determined the porosity of this sample;
    2. is weighed before and after immersion in the electrolytic bath;
    3. is weighed only after the electrolysis process takes place;
    4. is degreased in sulfuric acid;

Final laboratory test

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Protection of metals by nickelling

  1. An electrolysis cell consists of:
    1. analysis samples and electrolyte solution;
    2. two electrodes and filter paper;
    3. the anode, cathode, electrolyte solution, current source;
    4. the anode, cathode, and samples;
  2. When is submitted the sample to the electrolysis process, this:
    1. is introduced in natrium chloride for degreasing;
    2. is introduced in milk of lime solution for degreasing;
    3. is inserted into sulfuric acid, to clean;
    4. degreasing is not necessary because the oil stains do not affect the electrolysis process;
  3. Plates, which shall be deposited nickel are incorporated into the electrolysis bath:
    1. as a cathode because at the cathode reduction processes take place;
    2. as the anode because at the anode reduction processes take place;
    3. as the anode because at the anode oxidation processes take place;
    4. as a cathode because at the cathode oxidation processes take place;
  4. To determine the current efficiency, brass plate:
    1. is degreased in sulfuric acid;
    2. is weighed before and after immersion in the electrolytic bath;
    3. it is not required, weighing the plate because is determined the porosity of this sample;
    4. is weighed only after the electrolysis process takes place;
  5. Theoretical mass of nickel deposited is calculated using:
    1. law of mass action;
    2. solutions laws;
    3. perfect gas law;
    4. none of the answers are correct;

Final laboratory test

Do not use this paper to give answers!

Protection of metals by nickelling

  1. An electrolysis cell consists of:
    1. the anode, cathode, electrolyte solution, current source;
    2. two electrodes and filter paper;
    3. analysis samples and electrolyte solution;
    4. the anode, cathode, and samples;
  2. In order to determine porosity:
    1. steel plate weigh;
    2. include pores of the filter paper obtained by contact with steel plate;
    3. degrease steel plate in potassium chloride;
    4. steel sample is cleaned with filter paper;
  3. Plates, which shall be deposited nickel are incorporated into the electrolysis bath:
    1. as the anode because at the anode reduction processes take place;
    2. as the anode because at the anode oxidation processes take place;
    3. as a cathode because at the cathode reduction processes take place;
    4. as a cathode because at the cathode oxidation processes take place;
  4. To determine the current efficiency, brass plate:
    1. is weighed only after the electrolysis process takes place;
    2. it is not required, weighing the plate because is determined the porosity of this sample;
    3. is degreased in sulfuric acid;
    4. is weighed before and after immersion in the electrolytic bath;
  5. When is submitted the sample to the electrolysis process, this:
    1. is introduced in milk of lime solution for degreasing;
    2. is introduced in natrium chloride for degreasing;
    3. degreasing is not necessary because the oil stains do not affect the electrolysis process;
    4. is inserted into sulfuric acid, to clean;

Final laboratory test

Do not use this paper to give answers!

Protection of metals by nickelling

  1. Theoretical mass of nickel deposited is calculated using:
    1. perfect gas law;
    2. law of mass action;
    3. solutions laws;
    4. none of the answers are correct;
  2. An electrolysis cell consists of:
    1. two electrodes and filter paper;
    2. analysis samples and electrolyte solution;
    3. the anode, cathode, electrolyte solution, current source;
    4. the anode, cathode, and samples;
  3. To determine the current efficiency, brass plate:
    1. is weighed before and after immersion in the electrolytic bath;
    2. is degreased in sulfuric acid;
    3. it is not required, weighing the plate because is determined the porosity of this sample;
    4. is weighed only after the electrolysis process takes place;
  4. In order to determine porosity:
    1. degrease steel plate in potassium chloride;
    2. steel plate weigh;
    3. steel sample is cleaned with filter paper;
    4. include pores of the filter paper obtained by contact with steel plate;
  5. In the experiment of nickelling:
    1. iron from the cathode move in solution, replacing the nickel to be deposited;
    2. with as nickel sulfate solution is more concentrated, the more nickel is deposited on the cathode;
    3. nickel anode is consumed;
    4. nickel sulfate solution is weakly electrically conductive;

Final laboratory test

Do not use this paper to give answers!

Protection of metals by nickelling

  1. To determine the current efficiency, brass plate:
    1. is degreased in sulfuric acid;
    2. is weighed before and after immersion in the electrolytic bath;
    3. it is not required, weighing the plate because is determined the porosity of this sample;
    4. is weighed only after the electrolysis process takes place;
  2. In the experiment of nickelling:
    1. nickel sulfate solution is weakly electrically conductive;
    2. nickel anode is consumed;
    3. with as nickel sulfate solution is more concentrated, the more nickel is deposited on the cathode;
    4. iron from the cathode move in solution, replacing the nickel to be deposited;
  3. Theoretical mass of nickel deposited is calculated using:
    1. law of mass action;
    2. perfect gas law;
    3. none of the answers are correct;
    4. solutions laws;
  4. An electrolysis cell consists of:
    1. analysis samples and electrolyte solution;
    2. the anode, cathode, and samples;
    3. two electrodes and filter paper;
    4. the anode, cathode, electrolyte solution, current source;
  5. In order to determine porosity:
    1. steel plate weigh;
    2. degrease steel plate in potassium chloride;
    3. include pores of the filter paper obtained by contact with steel plate;
    4. steel sample is cleaned with filter paper;

Final laboratory test

Do not use this paper to give answers!

The study of difusion in gazeous state and molecular rates

  1. The diffusion model of the two species (NH3 and HCl) is chosen as follows:
    1. identify the largest absolute difference between gear ratios;
    2. not distinguish between gear ratios because it shows no importance;
    3. identify the largest absolute difference between diffusion coefficients ratios;
    4. identify the smallest absolute difference between gear ratios;
  2. Diffusion rates are calculated from:
    1. average energy and time report;
    2. diffusion coefficients and time report;
    3. molecular speeds and energies media report;
    4. measured distances and time report;
  3. For accurate measurement of diffusion time:
    1. the two pads moistened, placed on line, in the glass tube and start the timer;
    2. the two pads moistened are introduced simultaneously in the glass tube and start the timer;
    3. the two pads moistened are introduced at a certain time, into the glass tube and then stop the timer;
    4. the two pads moistened are introduced simultaneously in the glass tube and stop the timer;
  4. Which parameters were identical, at the diffusion, of NH3 and HCl:
    1. temperature and time of diffusion;
    2. temperature and concentration;
    3. the time of diffusion and concentration;
    4. the weigh of pads and concentration;
  5. After NH3 and HCl molecules diffuse:
    1. there is a chemical reaction to form ammonium chloride (NH4Cl);
    2. the gas discharge occurs in the tube;
    3. all other answers are correct;
    4. must be clean the tube to leave the workplace clean;

Final laboratory test

Do not use this paper to give answers!

The study of difusion in gazeous state and molecular rates

  1. Which of the models studied approximates best diffusion:
    1. speeds and/or energy to fashion;
    2. speeds and/or quadratic energy;
    3. speeds and/or energy mean;
    4. none of the answers are correct;
  2. Measuring the distances, is as follows:
    1. from the two rubber plugs to the ring formed;
    2. none of the answers are correct;
    3. from the two spots with HCl and NH3 respectively, to form NH4Cl ring;
    4. from the two ends of the glass tube, to the form ring;
  3. Diffusion rates are calculated from:
    1. average energy and time report;
    2. molecular speeds and energies media report;
    3. diffusion coefficients and time report;
    4. measured distances and time report;
  4. After NH3 and HCl molecules diffuse:
    1. the gas discharge occurs in the tube;
    2. must be clean the tube to leave the workplace clean;
    3. all other answers are correct;
    4. there is a chemical reaction to form ammonium chloride (NH4Cl);
  5. The diffusion model of the two species (NH3 and HCl) is chosen as follows:
    1. not distinguish between gear ratios because it shows no importance;
    2. identify the largest absolute difference between gear ratios;
    3. identify the largest absolute difference between diffusion coefficients ratios;
    4. identify the smallest absolute difference between gear ratios;

Final laboratory test

Do not use this paper to give answers!

The study of difusion in gazeous state and molecular rates

  1. Measuring the distances, is as follows:
    1. from the two rubber plugs to the ring formed;
    2. from the two spots with HCl and NH3 respectively, to form NH4Cl ring;
    3. from the two ends of the glass tube, to the form ring;
    4. none of the answers are correct;
  2. After NH3 and HCl molecules diffuse:
    1. must be clean the tube to leave the workplace clean;
    2. there is a chemical reaction to form ammonium chloride (NH4Cl);
    3. all other answers are correct;
    4. the gas discharge occurs in the tube;
  3. The diffusion model of the two species (NH3 and HCl) is chosen as follows:
    1. identify the largest absolute difference between gear ratios;
    2. not distinguish between gear ratios because it shows no importance;
    3. identify the largest absolute difference between diffusion coefficients ratios;
    4. identify the smallest absolute difference between gear ratios;
  4. Which of the models studied approximates best diffusion:
    1. speeds and/or energy mean;
    2. speeds and/or quadratic energy;
    3. none of the answers are correct;
    4. speeds and/or energy to fashion;
  5. For accurate measurement of diffusion time:
    1. the two pads moistened, placed on line, in the glass tube and start the timer;
    2. the two pads moistened are introduced at a certain time, into the glass tube and then stop the timer;
    3. the two pads moistened are introduced simultaneously in the glass tube and stop the timer;
    4. the two pads moistened are introduced simultaneously in the glass tube and start the timer;

Final laboratory test

Do not use this paper to give answers!

The study of difusion in gazeous state and molecular rates

  1. Which of the models studied approximates best diffusion:
    1. speeds and/or quadratic energy;
    2. speeds and/or energy to fashion;
    3. speeds and/or energy mean;
    4. none of the answers are correct;
  2. For accurate measurement of diffusion time:
    1. the two pads moistened are introduced simultaneously in the glass tube and stop the timer;
    2. the two pads moistened, placed on line, in the glass tube and start the timer;
    3. the two pads moistened are introduced simultaneously in the glass tube and start the timer;
    4. the two pads moistened are introduced at a certain time, into the glass tube and then stop the timer;
  3. After NH3 and HCl molecules diffuse:
    1. the gas discharge occurs in the tube;
    2. all other answers are correct;
    3. must be clean the tube to leave the workplace clean;
    4. there is a chemical reaction to form ammonium chloride (NH4Cl);
  4. The diffusion model of the two species (NH3 and HCl) is chosen as follows:
    1. identify the largest absolute difference between diffusion coefficients ratios;
    2. not distinguish between gear ratios because it shows no importance;
    3. identify the largest absolute difference between gear ratios;
    4. identify the smallest absolute difference between gear ratios;
  5. Diffusion rates are calculated from:
    1. diffusion coefficients and time report;
    2. measured distances and time report;
    3. average energy and time report;
    4. molecular speeds and energies media report;

Final laboratory test

Do not use this paper to give answers!

The study of difusion in gazeous state and molecular rates

  1. Diffusion rates are calculated from:
    1. diffusion coefficients and time report;
    2. average energy and time report;
    3. measured distances and time report;
    4. molecular speeds and energies media report;
  2. Measuring the distances, is as follows:
    1. none of the answers are correct;
    2. from the two rubber plugs to the ring formed;
    3. from the two spots with HCl and NH3 respectively, to form NH4Cl ring;
    4. from the two ends of the glass tube, to the form ring;
  3. The diffusion model of the two species (NH3 and HCl) is chosen as follows:
    1. not distinguish between gear ratios because it shows no importance;
    2. identify the largest absolute difference between diffusion coefficients ratios;
    3. identify the smallest absolute difference between gear ratios;
    4. identify the largest absolute difference between gear ratios;
  4. Which of the models studied approximates best diffusion:
    1. speeds and/or quadratic energy;
    2. speeds and/or energy to fashion;
    3. speeds and/or energy mean;
    4. none of the answers are correct;
  5. Which parameters were identical, at the diffusion, of NH3 and HCl:
    1. temperature and concentration;
    2. temperature and time of diffusion;
    3. the weigh of pads and concentration;
    4. the time of diffusion and concentration;