Final laboratory test

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Water analysis

  1. At the titration of water samples:
    1. the burette reads only at the start of titration process;
    2. the burette reads before the start of titration and at the end of titration;
    3. is added sulphuric acid in the samples;
    4. does not need to be read the burette;
  2. The experiment for the analysis of drinking water:
    1. was aimed at determination of the cations from water
    2. was aimed at the determination of alkalinity;
    3. was intended water purification;
    4. was aimed, at the wareness of the risks to which we expose drinking tap water;
  3. 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. hydroxides from water;
    4. all minerals dissolved in water;
  4. In order to determine the acidity of decationized water, the samples:
    1. are titrated with natrium hydroxide in presence of phenolphthalein;
    2. are titrated with hydrochloric acid in presence of methyl orange;
    3. none of the answers are correct;
    4. are titrated with sulphuric acid in presence of ERIO T;
  5. Water softening is based on passing the water on:
    1. distillation columns;
    2. ion exchange columns;
    3. cooling columns;
    4. fractionation columns;

Final laboratory test

Do not use this paper to give answers!

Water analysis

  1. The experiment for the analysis of drinking water:
    1. was aimed at determination of the cations from water
    2. was intended water purification;
    3. was aimed at the determination of alkalinity;
    4. was aimed, at the wareness of the risks to which we expose drinking tap water;
  2. The acidity of the water is due to:
    1. only insoluble salts;
    2. hydroxides from water;
    3. free carbon dioxide, mineral acids and salts of strong acids with weak bases;
    4. all minerals dissolved in water;
  3. At the titration of water samples:
    1. the burette reads before the start of titration and at the end of titration;
    2. the burette reads only at the start of titration process;
    3. is added sulphuric acid in the samples;
    4. does not need to be read the burette;
  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 sulphuric acid in the presence of methyl orange until the appearance of brown color;
    3. with potasium hydroxide;
    4. with sodium hydroxide in the presence of phenolphthalein until the appearance of pink color;
  5. In order to determine the acidity of decationized water, the samples:
    1. are titrated with hydrochloric acid in presence of methyl orange;
    2. are titrated with sulphuric acid in presence of ERIO T;
    3. none of the answers are correct;
    4. are titrated with natrium hydroxide in presence of phenolphthalein;

Final laboratory test

Do not use this paper to give answers!

Water analysis

  1. The acidity of the water is due to:
    1. hydroxides from water;
    2. free carbon dioxide, mineral acids and salts of strong acids with weak bases;
    3. all minerals dissolved in water;
    4. only insoluble salts;
  2. Water softening is based on passing the water on:
    1. distillation columns;
    2. ion exchange columns;
    3. fractionation columns;
    4. cooling columns;
  3. The experiment for the analysis of drinking water:
    1. was aimed at determination of the cations from water
    2. was intended water purification;
    3. was aimed at the determination of alkalinity;
    4. was aimed, at the wareness of the risks to which we expose drinking tap 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. In order to determine the acidity of decationized water, the samples:
    1. are titrated with natrium hydroxide in presence of phenolphthalein;
    2. none of the answers are correct;
    3. are titrated with sulphuric acid in presence of ERIO T;
    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. 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 formed a blue color complex after titration;
    4. is directly titrated with EDTA solution;
  2. Water softening is based on passing the water on:
    1. ion exchange columns;
    2. cooling columns;
    3. distillation columns;
    4. fractionation columns;
  3. At the titration of water samples:
    1. the burette reads before the start of titration and at the end of titration;
    2. the burette reads only at the start of titration process;
    3. does not need to be read the burette;
    4. is added sulphuric acid in the samples;
  4. When is determining temporary hardness titration of water samples is made:
    1. with potasium hydroxide;
    2. with clorhidric acid in the presence of methyl orange until the appearance of orange color;
    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;
  5. 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;

Final laboratory test

Do not use this paper to give answers!

Water analysis

  1. At the determination of total hardness in water sample:
    1. just add ERIO T and titrate;
    2. is formed a blue color complex after titration;
    3. is directly titrated with EDTA solution;
    4. ia added oxalic acid and then the sample is titrated with permanganate solution;
  2. 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 sulphuric acid in the presence of methyl orange until the appearance of brown color;
    4. with sodium hydroxide in the presence of phenolphthalein until the appearance of pink color;
  3. 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
  4. Water softening is based on passing the water on:
    1. fractionation columns;
    2. ion exchange columns;
    3. distillation columns;
    4. cooling columns;
  5. The acidity of the water is due to:
    1. free carbon dioxide, mineral acids and salts of strong acids with weak bases;
    2. only insoluble salts;
    3. hydroxides from water;
    4. all minerals dissolved in water;

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. sulphuric acid;
    4. a pH indicator that changes color depending on the pH of the solution;
  2. 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;
  3. In the calculation, of oxalic acid factor solution:
    1. its actual titer reads before and after the titration from the burette;
    2. its actual titer reads from the working procedure of laboratory work;
    3. it is not necessary to read the real titer;
    4. its actual titer reads from the reagent bottle label;
  4. Changing the color of pH indicator shows that:
    1. resumption of titration;
    2. does not have any effect on the process of titration;
    3. titration process should be continued;
    4. equivalent point;
  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

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Solution concentration

  1. Changing the color of pH indicator shows that:
    1. does not have any effect on the process of titration;
    2. resumption of titration;
    3. equivalent point;
    4. titration process should be continued;
  2. In the calculation, of oxalic acid factor solution:
    1. it is not necessary to read the real titer;
    2. its actual titer reads before and after the titration from the burette;
    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 increasing the oxidation number;
    2. acceptance of electrons, and decreasing the oxidation number;
    3. donation of electrons, and decreasing the oxidation number;
    4. donation of electrons, and increasing the oxidation number;
  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. 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 dark-brown color;
    3. none of the answers are correct;
    4. the orange color;

Final laboratory test

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Solution concentration

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

Final laboratory test

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Solution concentration

  1. Reactions between acids and bases:
    1. have as a consequence the formation of a quantity of water;
    2. have as a consequence the dissolution of a salt;
    3. are always fast, taking place almost instantaneously;
    4. are all exothermic;
  2. Titration is a laboratory operation, which is performed in the presence of:
    1. a salt;
    2. sulphuric acid;
    3. a pH indicator that changes color depending on the pH of the solution;
    4. natrium hydroxide;
  3. Changing the color of pH indicator shows that:
    1. titration process should be continued;
    2. resumption of titration;
    3. equivalent point;
    4. does not have any effect on the process of titration;
  4. The oxidation is the process of:
    1. acceptance of electrons, and decreasing the oxidation number;
    2. donation of electrons, and decreasing the oxidation number;
    3. acceptance of electrons, and increasing the oxidation number;
    4. donation of electrons, and increasing the oxidation number;
  5. At the redox titration with potassium permanganate solution, the samples were heated for:
    1. to stop the chemical reaction that occurs in the titration;
    2. decrease the reaction rate;
    3. has no effect;
    4. trigger and speed up the reaction;

Final laboratory test

Do not use this paper to give answers!

Solution concentration

  1. Changing the color of pH indicator shows that:
    1. resumption of titration;
    2. titration process should be continued;
    3. equivalent point;
    4. does not have any effect on the process of titration;
  2. At the redox titration with potassium permanganate solution, the samples were heated for:
    1. trigger and speed up the reaction;
    2. to stop the chemical reaction that occurs in the titration;
    3. decrease the reaction rate;
    4. has no effect;
  3. The oxidation is the process of:
    1. acceptance of electrons, and increasing the oxidation number;
    2. acceptance of electrons, and decreasing the oxidation number;
    3. donation of electrons, and increasing the oxidation number;
    4. donation of electrons, and decreasing the oxidation number;
  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. 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 dark-brown color;
    3. the yellow color;
    4. none of the answers are correct;

Final laboratory test

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Metal corrosion

  1. When calculating the corrosion rate the surface is expressed in:
    1. m2;
    2. cm2;
    3. m3;;
    4. dm2;
  2. In corrosion processes studied gas is released:
    1. only the corrosion of zinc;
    2. which is a volume that depends on the amount of metal corroded;
    3. which is a volume that does not depend on the sample surface;
    4. only the corrosion of aluminum;
  3. Corrosion of metals is:
    1. the cleaning of metals;
    2. a beneficial process that shows the stability of metals;
    3. the protection in time to chemical agents;
    4. the destruction of metals under the action of external factors;
  4. 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;
  5. Resistance grouping of the two samples studied in the laboratory is based on:
    1. the surface of the samples;
    2. their mass;
    3. their size, and time that are subject to chemical agents;
    4. the value of penetration index;

Final laboratory test

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Metal corrosion

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

Final laboratory test

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Metal corrosion

  1. 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;
  2. At the volumetric method:
    1. degrease the sample in sulfuric acid solution;
    2. the sample size of zinc are measured, and then weighed the sample;
    3. weigh the zinc before and after the process takes place;
    4. is not required, weighing the sample of zinc;
  3. When calculating the corrosion rate the surface is expressed in:
    1. cm2;
    2. dm2;
    3. m3;;
    4. m2;
  4. 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 weight only after immersion;
    4. is not necessary, weighing the aluminum sample;
  5. Resistance grouping of the two samples studied in the laboratory is based on:
    1. the value of penetration index;
    2. the surface of the samples;
    3. their mass;
    4. their size, and time that are subject to chemical agents;

Final laboratory test

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Metal corrosion

  1. The corrosion rate is:
    1. sample size variation 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. variation of the sample mass, per unit time;
  2. At the volumetric method:
    1. the sample size of zinc are measured, and then weighed the sample;
    2. is not required, weighing the sample of zinc;
    3. degrease the sample in sulfuric acid solution;
    4. weigh the zinc before and after the process takes place;
  3. 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. the surface of the samples;
    4. their mass;
  4. Corrosion of metals is:
    1. the protection in time to chemical agents;
    2. a beneficial process that shows the stability of metals;
    3. the destruction of metals under the action of external factors;
    4. the cleaning of metals;
  5. In corrosion processes studied gas is released:
    1. which is a volume that does not depend on the sample surface;
    2. which is a volume that depends on the amount of metal corroded;
    3. only the corrosion of aluminum;
    4. only the corrosion of zinc;

Final laboratory test

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Metal corrosion

  1. 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;
  2. In the gravimetric method, aluminum plate:
    1. is degreased in sodium hydroxide solution;
    2. is weight only after immersion;
    3. is weighed before and after immersing it in NaOH;
    4. is not necessary, weighing the aluminum sample;
  3. When calculating the corrosion rate the surface is expressed in:
    1. dm2;
    2. cm2;
    3. m3;;
    4. m2;
  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. the sample size of zinc are measured, and then weighed the sample;
    4. is not required, weighing the sample of zinc;
  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 alloys analysis

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

Final laboratory test

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Metal alloys analysis

  1. 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;
  2. 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. for the paper work as insulation;
    4. to be cut easily with scissors;
  3. When identify lead, is obtain a:
    1. yellow complex;
    2. blue complex;
    3. violet complex;
    4. red-brown complex;
  4. The oxidation state, which pass into solution, analyzed metal ions are:
    1. Fe3+; Ni2+; Cu2+; Zn2+; Co2+; Cr3+
    2. Fe2+; Ni3+; Cu1+; Zn3+; Co3+; Cr2+
    3. Fe2+; Ni1+; Cu1+; Zn3+; Co2+; Cr6+
    4. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
  5. When identify aluminum, ammonium hydroxide was added:
    1. for obtaining a red color complex;
    2. for removing the ions of Al3+;
    3. for ensuring the necessary pH, for the reaction;
    4. for stopping the reaction;

Final laboratory test

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Metal alloys analysis

  1. The electrograf consists of:
    1. filter paper and the sample;
    2. none of the answers are correct;
    3. current source and the sample;
    4. current source and the filter paper;
  2. The filter paper was acidified before analysis for:
    1. dissolution of hard soluble hydroxides;
    2. to remove the cations from the analyzed sample;
    3. to complex the cations from the sample;
    4. dissolution of acids;
  3. The oxidation state, which pass into solution, analyzed metal ions are:
    1. Fe3+; Ni2+; Cu2+; Zn2+; Co2+; Cr3+
    2. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
    3. Fe2+; Ni1+; Cu1+; Zn3+; Co2+; Cr6+
    4. Fe2+; Ni3+; Cu1+; Zn3+; Co3+; Cr2+
  4. 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;
  5. When identify aluminum, ammonium hydroxide was added:
    1. for stopping the reaction;
    2. for obtaining a red color complex;
    3. for ensuring the necessary pH, for the reaction;
    4. for removing the ions of Al3+;

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

Final laboratory test

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Metal alloys analysis

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

Final laboratory test

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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. the anode, cathode, and samples;
    4. analysis samples and electrolyte solution;
  2. To determine the current efficiency, brass plate:
    1. is degreased in sulfuric acid;
    2. it is not required, weighing the plate because is determined the porosity of this sample;
    3. is weighed only after the electrolysis process takes place;
    4. is weighed before and after immersion in the electrolytic bath;
  3. 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;
  4. In order to determine porosity:
    1. degrease steel plate in potassium chloride;
    2. include pores of the filter paper obtained by contact with steel plate;
    3. steel sample is cleaned with filter paper;
    4. steel plate weigh;
  5. In the experiment of nickelling:
    1. nickel anode is consumed;
    2. iron from the cathode move in solution, replacing the nickel to be deposited;
    3. with as nickel sulfate solution is more concentrated, the more nickel is deposited on the cathode;
    4. nickel sulfate solution is weakly electrically conductive;

Final laboratory test

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Protection of metals by nickelling

  1. 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. is weighed only after the electrolysis process takes place;
    4. it is not required, weighing the plate because is determined the porosity of this sample;
  2. When is submitted the sample to the electrolysis process, this:
    1. is introduced in natrium chloride for degreasing;
    2. degreasing is not necessary because the oil stains do not affect the electrolysis process;
    3. is introduced in milk of lime solution for degreasing;
    4. is inserted into sulfuric acid, to clean;
  3. An electrolysis cell consists of:
    1. the anode, cathode, and samples;
    2. analysis samples and electrolyte solution;
    3. two electrodes and filter paper;
    4. the anode, cathode, electrolyte solution, current source;
  4. Theoretical mass of nickel deposited is calculated using:
    1. none of the answers are correct;
    2. solutions laws;
    3. perfect gas law;
    4. law of mass action;
  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!

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 inserted into sulfuric acid, to clean;
    4. is introduced in milk of lime solution for degreasing;
  2. 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;
  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 oxidation processes take place;
    3. as a cathode because at the cathode oxidation processes take place;
    4. as the anode because at the anode reduction processes take place;
  4. In the experiment of nickelling:
    1. with as nickel sulfate solution is more concentrated, the more nickel is deposited on the cathode;
    2. iron from the cathode move in solution, replacing the nickel to be deposited;
    3. nickel sulfate solution is weakly electrically conductive;
    4. nickel anode is consumed;
  5. 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;

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 weighed only after the electrolysis process takes place;
    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 before and after immersion in the electrolytic bath;
  2. Theoretical mass of nickel deposited is calculated using:
    1. none of the answers are correct;
    2. solutions laws;
    3. perfect gas law;
    4. law of mass action;
  3. When is submitted the sample to the electrolysis process, this:
    1. is introduced in milk of lime solution for degreasing;
    2. is inserted into sulfuric acid, to clean;
    3. degreasing is not necessary because the oil stains do not affect the electrolysis process;
    4. is introduced in natrium chloride for degreasing;
  4. Plates, which shall be deposited nickel are incorporated into the electrolysis bath:
    1. as a cathode because at the cathode oxidation 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 the anode because at the anode reduction processes take place;
  5. In order to determine porosity:
    1. steel sample is cleaned with filter paper;
    2. steel plate weigh;
    3. include pores of the filter paper obtained by contact with steel plate;
    4. degrease steel plate in potassium chloride;

Final laboratory test

Do not use this paper to give answers!

Protection of metals by nickelling

  1. In order to determine porosity:
    1. include pores of the filter paper obtained by contact with steel plate;
    2. degrease steel plate in potassium chloride;
    3. steel sample is cleaned with filter paper;
    4. steel plate weigh;
  2. 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;
  3. In the experiment of nickelling:
    1. with as nickel sulfate solution is more concentrated, the more nickel is deposited on the cathode;
    2. nickel sulfate solution is weakly electrically conductive;
    3. iron from the cathode move in solution, replacing the nickel to be deposited;
    4. nickel anode is consumed;
  4. 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;
  5. To determine the current efficiency, brass plate:
    1. is weighed before and after immersion in the electrolytic bath;
    2. is weighed only after the electrolysis process takes place;
    3. is degreased in sulfuric acid;
    4. it is not required, weighing the plate because is determined the porosity of this sample;

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. not distinguish between gear ratios because it shows no importance;
    2. identify the largest absolute difference between diffusion coefficients ratios;
    3. identify the largest absolute difference between gear ratios;
    4. identify the smallest absolute difference between gear ratios;
  2. 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;
  3. Diffusion rates are calculated from:
    1. average energy and time report;
    2. measured distances and time report;
    3. molecular speeds and energies media report;
    4. diffusion coefficients and time report;
  4. After NH3 and HCl molecules diffuse:
    1. must be clean the tube to leave the workplace clean;
    2. all other answers are correct;
    3. the gas discharge occurs in the tube;
    4. there is a chemical reaction to form ammonium chloride (NH4Cl);
  5. Which parameters were identical, at the diffusion, of NH3 and HCl:
    1. the time of diffusion and concentration;
    2. the weigh of pads and concentration;
    3. temperature and concentration;
    4. temperature and time of diffusion;

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

Final laboratory test

Do not use this paper to give answers!

The study of difusion in gazeous state and molecular rates

  1. 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 stop 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;
  2. After NH3 and HCl molecules diffuse:
    1. all other answers are correct;
    2. the gas discharge occurs in the tube;
    3. there is a chemical reaction to form ammonium chloride (NH4Cl);
    4. must be clean the tube to leave the workplace clean;
  3. The diffusion model of the two species (NH3 and HCl) is chosen as follows:
    1. identify the smallest absolute difference between gear ratios;
    2. identify the largest absolute difference between gear ratios;
    3. not distinguish between gear ratios because it shows no importance;
    4. identify the largest absolute difference between diffusion coefficients ratios;
  4. Which of the models studied approximates best diffusion:
    1. none of the answers are correct;
    2. speeds and/or energy to fashion;
    3. speeds and/or energy mean;
    4. speeds and/or quadratic energy;
  5. Which parameters were identical, at the diffusion, of NH3 and HCl:
    1. temperature and time of diffusion;
    2. the weigh of pads and concentration;
    3. the time of diffusion and concentration;
    4. temperature and concentration;