Final laboratory test

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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 the determination of alkalinity;
    4. was aimed at determination of the cations from water
  2. At the titration of water samples:
    1. the burette reads before the start of titration and at the end of titration;
    2. is added sulphuric acid in the samples;
    3. does not need to be read the burette;
    4. the burette reads only at the start of titration process;
  3. The acidity of the water is due to:
    1. all minerals dissolved in water;
    2. free carbon dioxide, mineral acids and salts of strong acids with weak bases;
    3. only insoluble salts;
    4. hydroxides from 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. are titrated with sulphuric acid in presence of ERIO T;
    4. none of the answers are correct;
  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 clorhidric acid in the presence of methyl orange until the appearance of orange color;
    4. with potasium hydroxide;

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 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;
  3. At the titration of water samples:
    1. does not need to be read the burette;
    2. is added sulphuric acid in the samples;
    3. the burette reads only at the start of titration process;
    4. the burette reads before the start of titration and at the end of titration;
  4. At the determination of total hardness in water sample:
    1. is directly titrated with EDTA solution;
    2. just add ERIO T and titrate;
    3. is formed a blue color complex after titration;
    4. ia added oxalic acid and then the sample is titrated with permanganate solution;
  5. 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;

Final laboratory test

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Water analysis

  1. The acidity of the water is due to:
    1. all minerals dissolved in water;
    2. free carbon dioxide, mineral acids and salts of strong acids with weak bases;
    3. only insoluble salts;
    4. hydroxides from water;
  2. In order to determine the acidity of decationized water, the samples:
    1. are titrated with hydrochloric acid in presence of methyl orange;
    2. none of the answers are correct;
    3. are titrated with sulphuric acid in presence of ERIO T;
    4. are titrated with natrium hydroxide in presence of phenolphthalein;
  3. At the determination of total hardness in water sample:
    1. is formed a blue color complex after titration;
    2. just add ERIO T and titrate;
    3. ia added oxalic acid and then the sample is titrated with permanganate solution;
    4. is directly titrated with EDTA solution;
  4. 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;
  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 the determination of alkalinity;
    4. was aimed at determination of the cations from water

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. are titrated with natrium hydroxide in presence of phenolphthalein;
    3. are titrated with hydrochloric acid in presence of methyl orange;
    4. none of the answers are correct;
  2. Water softening is based on passing the water on:
    1. distillation columns;
    2. ion exchange columns;
    3. fractionation columns;
    4. cooling columns;
  3. At the determination of total hardness in water sample:
    1. is directly titrated with EDTA solution;
    2. is formed a blue color complex after titration;
    3. just add ERIO T and titrate;
    4. ia added oxalic acid and then the sample is titrated with permanganate solution;
  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. At the titration of water samples:
    1. the burette reads before the start of titration and at the end of titration;
    2. is added sulphuric acid in the samples;
    3. does not need to be read the burette;
    4. the burette reads only at the start of titration process;

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 natrium hydroxide in presence of phenolphthalein;
    2. none of the answers are correct;
    3. are titrated with hydrochloric acid in presence of methyl orange;
    4. are titrated with sulphuric acid in presence of ERIO T;
  2. At the determination of total hardness in water sample:
    1. just add ERIO T and titrate;
    2. is directly titrated with EDTA solution;
    3. is formed a blue color complex after titration;
    4. ia added oxalic acid and then the sample is titrated with permanganate solution;
  3. When is determining temporary hardness titration of water samples is made:
    1. with potasium hydroxide;
    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 clorhidric acid in the presence of methyl orange until the appearance of orange color;
  4. At the titration of water samples:
    1. does not need to be read the burette;
    2. the burette reads only at the start of titration process;
    3. is added sulphuric acid in the samples;
    4. the burette reads before the start of titration and at the end of titration;
  5. The experiment for the analysis of drinking water:
    1. was aimed at the determination of alkalinity;
    2. was aimed at determination of the cations from water
    3. was intended water purification;
    4. was aimed, at the wareness of the risks to which we expose drinking tap water;

Final laboratory test

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Solution concentration

  1. 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. trigger and speed up the reaction;
    4. has no effect;
  2. 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;
  3. 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 working procedure of laboratory work;
    4. its actual titer reads from the reagent bottle label;
  4. Acid-base titration of the three samples of sulfuric acid with sodium hydroxide, is carried out until the appearance of:
    1. none of the answers are correct;
    2. the yellow color;
    3. the dark-brown color;
    4. the orange color;
  5. Changing the color of pH indicator shows that:
    1. equivalent point;
    2. titration process should be continued;
    3. resumption of titration;
    4. does not have any effect on the process of titration;

Final laboratory test

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Solution concentration

  1. 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. has no effect;
    3. trigger and speed up the reaction;
    4. decrease the reaction rate;
  2. Changing the color of pH indicator shows that:
    1. titration process should be continued;
    2. does not have any effect on the process of titration;
    3. resumption of titration;
    4. equivalent point;
  3. Acid-base titration of the three samples of sulfuric acid with sodium hydroxide, is carried out until the appearance of:
    1. none of the answers are correct;
    2. the orange color;
    3. the yellow color;
    4. the dark-brown color;
  4. Titration is a laboratory operation, which is performed in the presence of:
    1. a pH indicator that changes color depending on the pH of the solution;
    2. a salt;
    3. natrium hydroxide;
    4. sulphuric acid;
  5. The oxidation is the process of:
    1. donation of electrons, and decreasing the oxidation number;
    2. donation of electrons, and increasing the oxidation number;
    3. acceptance of electrons, and decreasing the oxidation number;
    4. acceptance of electrons, and increasing the oxidation number;

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 pH indicator that changes color depending on the pH of the solution;
    3. sulphuric acid;
    4. a salt;
  2. 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;
  3. Acid-base titration of the three samples of sulfuric acid with sodium hydroxide, is carried out until the appearance of:
    1. the dark-brown color;
    2. the orange color;
    3. the yellow color;
    4. none of the answers are correct;
  4. In the calculation, of oxalic acid factor solution:
    1. its actual titer reads from the reagent bottle label;
    2. it is not necessary to read the real titer;
    3. its actual titer reads from the working procedure of laboratory work;
    4. its actual titer reads before and after the titration from the burette;
  5. Changing the color of pH indicator shows that:
    1. titration process should be continued;
    2. does not have any effect on the process of titration;
    3. resumption of titration;
    4. equivalent point;

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. 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. has no effect;
    4. decrease the reaction rate;
  3. Changing the color of pH indicator shows that:
    1. titration process should be continued;
    2. equivalent point;
    3. does not have any effect on the process of titration;
    4. resumption of titration;
  4. 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. none of the answers are correct;
    3. the dark-brown color;
    4. the orange color;
  5. The oxidation is the process of:
    1. acceptance of electrons, and decreasing the oxidation number;
    2. donation of electrons, and increasing the oxidation number;
    3. acceptance of electrons, and increasing the oxidation number;
    4. donation of electrons, and decreasing the oxidation number;

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. the yellow color;
    3. none of the answers are correct;
    4. the dark-brown color;
  2. 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;
  3. Reactions between acids and bases:
    1. are all exothermic;
    2. have as a consequence the formation of a quantity of water;
    3. are always fast, taking place almost instantaneously;
    4. have as a consequence the dissolution of a salt;
  4. 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. acceptance of electrons, and increasing the oxidation number;
    4. donation of electrons, and decreasing the oxidation number;
  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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Metal corrosion

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

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 degreased in sodium hydroxide solution;
    3. is weight only after immersion;
    4. is weighed before and after immersing it in NaOH;
  2. 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 zinc;
    4. only the corrosion of aluminum;
  3. The corrosion rate is:
    1. variation of the sample mass per unit area, per unit time;
    2. variation of the sample mass, per unit time;
    3. variation of the sample mass per unit area;
    4. sample size variation per unit time;
  4. Corrosion of metals is:
    1. a beneficial process that shows the stability of metals;
    2. the protection in time to chemical agents;
    3. the destruction of metals under the action of external factors;
    4. the cleaning of metals;
  5. 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;

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 mass;
    2. the value of penetration index;
    3. the surface of the samples;
    4. their size, and time that are subject to chemical agents;
  2. When calculating the corrosion rate the surface is expressed in:
    1. m2;
    2. m3;;
    3. cm2;
    4. dm2;
  3. In the gravimetric method, aluminum plate:
    1. is weight only after immersion;
    2. is not necessary, weighing the aluminum sample;
    3. is weighed before and after immersing it in NaOH;
    4. is degreased in sodium hydroxide solution;
  4. The corrosion rate is:
    1. sample size variation per unit time;
    2. variation of the sample mass per unit area;
    3. variation of the sample mass per unit area, per unit time;
    4. variation of the sample mass, per unit time;
  5. At the volumetric method:
    1. weigh the zinc before and after the process takes place;
    2. degrease the sample in sulfuric acid solution;
    3. the sample size of zinc are measured, and then weighed the sample;
    4. is not required, weighing the sample of zinc;

Final laboratory test

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Metal corrosion

  1. 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;
  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 degreased in sodium hydroxide solution;
    2. is not necessary, weighing the aluminum sample;
    3. is weighed before and after immersing it in NaOH;
    4. is weight only after immersion;
  4. In corrosion processes studied gas is released:
    1. only the corrosion of aluminum;
    2. which is a volume that depends on the amount of metal corroded;
    3. only the corrosion of zinc;
    4. which is a volume that does not depend on the sample surface;
  5. When calculating the corrosion rate the surface is expressed in:
    1. dm2;
    2. cm2;
    3. m2;
    4. m3;;

Final laboratory test

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Metal corrosion

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

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 filter paper;
    4. current source and the sample;
  2. The oxidation state, which pass into solution, analyzed metal ions are:
    1. Fe2+; Ni3+; Cu1+; Zn3+; Co3+; Cr2+
    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. Fe3+; Ni2+; Cu2+; Zn2+; Co2+; Cr3+
  3. The filter paper was acidified before analysis for:
    1. to remove the cations from the analyzed sample;
    2. dissolution of acids;
    3. dissolution of hard soluble hydroxides;
    4. to complex the cations from the sample;
  4. When identify lead, is obtain a:
    1. red-brown complex;
    2. yellow complex;
    3. violet complex;
    4. blue complex;
  5. 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;

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 stopping the reaction;
    3. for removing the ions of Al3+;
    4. for ensuring the necessary pH, for the reaction;
  2. The electrograf consists of:
    1. none of the answers are correct;
    2. current source and the sample;
    3. current source and the filter paper;
    4. filter paper and the sample;
  3. This method of analysis of metal alloys is:
    1. a gravimetric method of analysis;
    2. destructive method of analysis;
    3. a quantitative method of analysis;
    4. a nondestructive method of analysis;
  4. The filter paper was acidified before analysis for:
    1. dissolution of hard soluble hydroxides;
    2. to remove the cations from the analyzed sample;
    3. dissolution of acids;
    4. to complex the cations from the 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. for stopping the chemical reaction that takes place;
    4. none of the answers are correct;

Final laboratory test

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Metal alloys analysis

  1. 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;
  2. 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 stopping the chemical reaction that takes place;
    4. for the paper work as insulation;
  3. When identify lead, is obtain a:
    1. yellow complex;
    2. red-brown complex;
    3. blue complex;
    4. violet complex;
  4. The filter paper was acidified before analysis for:
    1. to complex the cations from the sample;
    2. to remove the cations from the analyzed sample;
    3. dissolution of hard soluble hydroxides;
    4. dissolution of acids;
  5. This method of analysis of metal alloys is:
    1. destructive method of analysis;
    2. a gravimetric method of analysis;
    3. a quantitative method of analysis;
    4. a nondestructive method of analysis;

Final laboratory test

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Metal alloys analysis

  1. 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+;
  2. This method of analysis of metal alloys is:
    1. a quantitative method of analysis;
    2. destructive method of analysis;
    3. a nondestructive method of analysis;
    4. a gravimetric method of analysis;
  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. 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. The electrograf consists of:
    1. current source and the sample;
    2. none of the answers are correct;
    3. current source and the filter paper;
    4. filter paper and the sample;

Final laboratory test

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Metal alloys analysis

  1. When identify aluminum, ammonium hydroxide was added:
    1. for stopping the reaction;
    2. for obtaining a red color complex;
    3. for removing the ions of Al3+;
    4. for ensuring the necessary pH, for the reaction;
  2. 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;
  3. The filter paper was acidified before analysis for:
    1. to complex the cations from the sample;
    2. to remove the cations from the analyzed sample;
    3. dissolution of acids;
    4. dissolution of hard soluble hydroxides;
  4. 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. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
    4. Fe3+; Ni2+; Cu2+; Zn2+; Co2+; Cr3+
  5. This method of analysis of metal alloys is:
    1. destructive method of analysis;
    2. a quantitative method of analysis;
    3. a nondestructive method of analysis;
    4. a gravimetric method of analysis;

Final laboratory test

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Protection of metals by nickelling

  1. Theoretical mass of nickel deposited is calculated using:
    1. none of the answers are correct;
    2. perfect gas law;
    3. law of mass action;
    4. solutions laws;
  2. 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 reduction processes take place;
    3. as a cathode because at the cathode reduction processes take place;
    4. as the anode because at the anode oxidation processes take place;
  3. 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;
  4. When is submitted the sample to the electrolysis process, this:
    1. is introduced in natrium chloride 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 milk of lime solution for degreasing;
  5. 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;

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 inserted into sulfuric acid, to clean;
    2. is introduced in milk of lime solution for degreasing;
    3. is introduced in natrium chloride for degreasing;
    4. degreasing is not necessary because the oil stains do not affect the electrolysis process;
  3. In order to determine porosity:
    1. steel sample is cleaned with filter paper;
    2. steel plate weigh;
    3. degrease steel plate in potassium chloride;
    4. include pores of the filter paper obtained by contact with steel plate;
  4. In the experiment of nickelling:
    1. nickel sulfate solution is weakly electrically conductive;
    2. nickel anode is consumed;
    3. iron from the cathode move in solution, replacing the nickel to be deposited;
    4. with as nickel sulfate solution is more concentrated, the more nickel is deposited on the cathode;
  5. Theoretical mass of nickel deposited is calculated using:
    1. perfect gas law;
    2. law of mass action;
    3. none of the answers are correct;
    4. solutions laws;

Final laboratory test

Do not use this paper to give answers!

Protection of metals by nickelling

  1. 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;
  2. 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;
  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 milk of lime solution for degreasing;
    3. is inserted into sulfuric acid, to clean;
    4. is introduced in natrium chloride for degreasing;
  4. 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 a cathode because at the cathode reduction processes take place;
    3. as a cathode because at the cathode oxidation processes take place;
    4. as the anode because at the anode oxidation processes take place;
  5. In order to determine porosity:
    1. steel plate weigh;
    2. steel sample is cleaned with filter paper;
    3. degrease steel plate in potassium chloride;
    4. include pores of the filter paper obtained by contact with steel plate;

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. steel sample is cleaned with filter paper;
    3. degrease steel plate in potassium chloride;
    4. steel plate weigh;
  2. 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 sulfate solution is weakly electrically conductive;
    4. nickel anode is consumed;
  3. 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;
  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 reduction processes take place;
    3. as a cathode because at the cathode reduction processes take place;
    4. as the anode because at the anode oxidation processes take place;
  5. Theoretical mass of nickel deposited is calculated using:
    1. solutions laws;
    2. none of the answers are correct;
    3. perfect gas law;
    4. law of mass action;

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. 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;
  2. Theoretical mass of nickel deposited is calculated using:
    1. solutions laws;
    2. law of mass action;
    3. none of the answers are correct;
    4. perfect gas law;
  3. To determine the current efficiency, brass plate:
    1. is weighed only after the electrolysis process takes place;
    2. is degreased in sulfuric acid;
    3. is weighed before and after immersion in the electrolytic bath;
    4. it is not required, weighing the plate because is determined the porosity of this sample;
  4. 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 a cathode because at the cathode 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;
  5. In order to determine porosity:
    1. steel sample is cleaned with filter paper;
    2. include pores of the filter paper obtained by contact with steel plate;
    3. steel plate weigh;
    4. degrease steel plate in potassium chloride;

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 smallest absolute difference between gear ratios;
    2. not distinguish between gear ratios because it shows no importance;
    3. identify the largest absolute difference between gear ratios;
    4. identify the largest absolute difference between diffusion coefficients ratios;
  2. 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 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, placed on line, in the glass tube and start the timer;
  3. Diffusion rates are calculated from:
    1. measured distances and time report;
    2. molecular speeds and energies media report;
    3. average energy and time report;
    4. diffusion coefficients and time report;
  4. 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;
  5. 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;

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. temperature and concentration;
    2. temperature and time of diffusion;
    3. the time of diffusion and concentration;
    4. the weigh of pads and concentration;
  2. Measuring the distances, is as follows:
    1. none of the answers are correct;
    2. from the two ends of the glass tube, to the form ring;
    3. from the two rubber plugs to the ring formed;
    4. from the two spots with HCl and NH3 respectively, to form NH4Cl ring;
  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. 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. identify the smallest absolute difference between gear ratios;
    3. identify the largest absolute difference between gear ratios;
    4. not distinguish between gear ratios because it shows no importance;
  5. Which of the models studied approximates best diffusion:
    1. speeds and/or quadratic energy;
    2. speeds and/or energy mean;
    3. speeds and/or energy to fashion;
    4. none of the answers are correct;

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

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 ends of the glass tube, to the form ring;
    3. from the two rubber plugs to the ring formed;
    4. from the two spots with HCl and NH3 respectively, to form NH4Cl ring;
  2. Which of the models studied approximates best diffusion:
    1. speeds and/or energy to fashion;
    2. speeds and/or energy mean;
    3. none of the answers are correct;
    4. speeds and/or quadratic energy;
  3. 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;
  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. identify the largest absolute difference between gear ratios;
    3. not distinguish between gear ratios because it shows no importance;
    4. identify the smallest absolute difference between gear ratios;
  5. 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. the gas discharge occurs in the tube;
    4. all other answers are correct;

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. average energy and time report;
    2. molecular speeds and energies media report;
    3. diffusion coefficients and time report;
    4. measured distances and time report;
  2. Which of the models studied approximates best diffusion:
    1. speeds and/or energy to fashion;
    2. speeds and/or energy mean;
    3. speeds and/or quadratic energy;
    4. none of the answers are correct;
  3. 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 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, placed on line, in the glass tube and start the timer;
  4. Which parameters were identical, at the diffusion, of NH3 and HCl:
    1. the weigh of pads and concentration;
    2. temperature and time of diffusion;
    3. the time of diffusion and concentration;
    4. temperature and concentration;
  5. 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);