Final laboratory test

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Water analysis

  1. 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;
  2. The acidity of the water is due to:
    1. only insoluble salts;
    2. hydroxides from water;
    3. all minerals dissolved in water;
    4. free carbon dioxide, mineral acids and salts of strong acids with weak bases;
  3. 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;
  4. 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
  5. At the determination of total hardness in water sample:
    1. is formed a blue color complex after titration;
    2. is directly titrated with EDTA solution;
    3. just add ERIO T and titrate;
    4. ia added oxalic acid and then the sample is titrated with permanganate solution;

Final laboratory test

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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 hydrochloric acid in presence of methyl orange;
    3. none of the answers are correct;
    4. are titrated with natrium hydroxide in presence of phenolphthalein;
  2. The acidity of the water is due to:
    1. hydroxides from water;
    2. all minerals dissolved in water;
    3. free carbon dioxide, mineral acids and salts of strong acids with weak bases;
    4. only insoluble salts;
  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. is directly titrated with EDTA solution;
    4. just add ERIO T and titrate;
  4. At the titration of water samples:
    1. is added sulphuric acid in the samples;
    2. the burette reads only at the start of titration process;
    3. the burette reads before the start of titration and at the end of titration;
    4. does not need to be read the burette;
  5. The experiment for the analysis of drinking water:
    1. was aimed at determination of the cations from water
    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 intended water purification;

Final laboratory test

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Water analysis

  1. 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;
  2. 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 directly titrated with EDTA solution;
    4. is formed a blue color complex after titration;
  3. 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
  4. Water softening is based on passing the water on:
    1. distillation columns;
    2. ion exchange columns;
    3. cooling columns;
    4. fractionation columns;
  5. 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;

Final laboratory test

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Water analysis

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

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 sulphuric acid in presence of ERIO T;
    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. distillation columns;
    2. cooling columns;
    3. fractionation columns;
    4. ion exchange columns;
  3. The experiment for the analysis of drinking water:
    1. was aimed at determination of the cations from water
    2. was aimed, at the wareness of the risks to which we expose drinking tap water;
    3. was intended water purification;
    4. was aimed at the determination of alkalinity;
  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. At the titration of water samples:
    1. does not need to be read the burette;
    2. the burette reads before the start of titration and at the end of titration;
    3. is added sulphuric acid in the samples;
    4. the burette reads only at the start of titration process;

Final laboratory test

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Solution concentration

  1. Reactions between acids and bases:
    1. are all exothermic;
    2. are always fast, taking place almost instantaneously;
    3. have as a consequence the formation of a quantity of water;
    4. have as a consequence the dissolution of 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. 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. sulphuric acid;
    3. natrium hydroxide;
    4. a salt;
  4. Changing the color of pH indicator shows that:
    1. does not have any effect on the process of titration;
    2. titration process should be continued;
    3. resumption of titration;
    4. equivalent point;
  5. The oxidation is the process of:
    1. donation of electrons, and increasing the oxidation number;
    2. donation of electrons, and decreasing 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. Changing the color of pH indicator shows that:
    1. does not have any effect on the process of titration;
    2. titration process should be continued;
    3. resumption of titration;
    4. equivalent point;
  2. 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;
  3. 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;
  4. 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;
  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

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Solution concentration

  1. 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. natrium hydroxide;
    3. sulphuric acid;
    4. a salt;
  2. Changing the color of pH indicator shows that:
    1. titration process should be continued;
    2. resumption of titration;
    3. does not have any effect on the process of titration;
    4. equivalent point;
  3. 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;
  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 orange color;
    3. the dark-brown color;
    4. the yellow 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. donation 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. sulphuric acid;
    2. natrium hydroxide;
    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 dissolution of a salt;
    2. have as a consequence the formation of a quantity of water;
    3. are all exothermic;
    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 dark-brown color;
    2. the yellow color;
    3. the orange color;
    4. none of the answers are correct;
  4. 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. has no effect;
    4. decrease the reaction rate;
  5. 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 reagent bottle label;
    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;

Final laboratory test

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Solution concentration

  1. The oxidation is the process of:
    1. donation of electrons, and decreasing 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 increasing the oxidation number;
  2. Reactions between acids and bases:
    1. have as a consequence the formation of a quantity of water;
    2. are all exothermic;
    3. are always fast, taking place almost instantaneously;
    4. have as a consequence the dissolution of a salt;
  3. Titration is a laboratory operation, which is performed in the presence of:
    1. sulphuric acid;
    2. a pH indicator that changes color depending on the pH of the solution;
    3. a salt;
    4. natrium hydroxide;
  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 orange color;
    3. the dark-brown color;
    4. the yellow color;
  5. Changing the color of pH indicator shows that:
    1. does not have any effect on the process of titration;
    2. titration process should be continued;
    3. equivalent point;
    4. resumption of titration;

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 time;
    4. variation of the sample mass per unit area;
  2. 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. is not required, weighing the sample of zinc;
    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 mass;
    2. the surface of the samples;
    3. the value of penetration index;
    4. their size, and time that are subject to chemical agents;
  4. 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. which is a volume that does not depend on the sample surface;
    4. only the corrosion of aluminum;
  5. 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;

Final laboratory test

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Metal corrosion

  1. At the volumetric method:
    1. weigh the zinc before and after the process takes place;
    2. the sample size of zinc are measured, and then weighed the sample;
    3. degrease the sample in sulfuric acid solution;
    4. is not required, weighing the sample of zinc;
  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. When calculating the corrosion rate the surface is expressed in:
    1. m3;;
    2. m2;
    3. cm2;
    4. dm2;
  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. their mass;
    3. the value of penetration index;
    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;
    3. variation of the sample mass per unit area, per unit time;
    4. sample size variation 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 value of penetration index;
    4. the surface of the samples;
  2. 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;
  3. At the volumetric method:
    1. weigh the zinc before and after the process takes place;
    2. degrease the sample in sulfuric acid solution;
    3. is not required, weighing the sample of zinc;
    4. the sample size of zinc are measured, and then weighed the sample;
  4. When calculating the corrosion rate the surface is expressed in:
    1. m3;;
    2. cm2;
    3. m2;
    4. dm2;
  5. Corrosion of metals is:
    1. the destruction of metals under the action of external factors;
    2. the cleaning of metals;
    3. a beneficial process that shows the stability of metals;
    4. the protection in time 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 time;
    3. variation of the sample mass per unit area, per unit time;
    4. variation of the sample mass per unit area;
  2. 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;
  3. 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;
  4. In the gravimetric method, aluminum plate:
    1. is not necessary, weighing the aluminum sample;
    2. is weighed before and after immersing it in NaOH;
    3. is weight only after immersion;
    4. is degreased in sodium hydroxide solution;
  5. In corrosion processes studied gas is released:
    1. only the corrosion of aluminum;
    2. only the corrosion of zinc;
    3. which is a volume that does not depend on the sample surface;
    4. which is a volume that depends on the amount of metal corroded;

Final laboratory test

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Metal corrosion

  1. 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;
  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. Corrosion of metals is:
    1. the destruction of metals under the action of external factors;
    2. the cleaning of metals;
    3. a beneficial process that shows the stability of metals;
    4. the protection in time to chemical agents;
  4. When calculating the corrosion rate the surface is expressed in:
    1. m3;;
    2. dm2;
    3. cm2;
    4. m2;
  5. 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;

Final laboratory test

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Metal alloys analysis

  1. The electrograf consists of:
    1. filter paper and the sample;
    2. current source and the sample;
    3. none of the answers are correct;
    4. current source and the filter paper;
  2. Why moisten the filter paper with solution of sodium nitrate?
    1. to be cut easily with scissors;
    2. for the paper work as insulation;
    3. for stopping the chemical reaction that takes place;
    4. none of the answers are correct;
  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. When identify lead, is obtain a:
    1. violet complex;
    2. red-brown complex;
    3. blue complex;
    4. yellow complex;
  5. The filter paper was acidified before analysis for:
    1. dissolution of acids;
    2. dissolution of hard soluble hydroxides;
    3. to remove the cations from the analyzed sample;
    4. to complex the cations from the sample;

Final laboratory test

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Metal alloys analysis

  1. 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. Fe2+; Ni3+; Cu1+; Zn3+; Co3+; Cr2+
    4. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
  2. 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+;
  3. The electrograf consists of:
    1. current source and the filter paper;
    2. current source and the sample;
    3. none of the answers are correct;
    4. filter paper and the sample;
  4. Why moisten the filter paper with solution of sodium nitrate?
    1. to be cut easily with scissors;
    2. for stopping the chemical reaction that takes place;
    3. none of the answers are correct;
    4. for the paper work as insulation;
  5. When identify lead, is obtain a:
    1. yellow complex;
    2. blue complex;
    3. red-brown complex;
    4. violet complex;

Final laboratory test

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Metal alloys analysis

  1. When identify lead, is obtain a:
    1. yellow complex;
    2. red-brown complex;
    3. blue complex;
    4. violet complex;
  2. 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;
  3. The filter paper was acidified before analysis for:
    1. to complex the cations from the sample;
    2. dissolution of hard soluble hydroxides;
    3. dissolution of acids;
    4. to remove the cations from the analyzed sample;
  4. 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;
  5. 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;

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. current source and the filter paper;
    4. filter paper and the sample;
  2. When identify aluminum, ammonium hydroxide was added:
    1. for stopping the reaction;
    2. for ensuring the necessary pH, for the reaction;
    3. for obtaining a red color complex;
    4. for removing the ions of Al3+;
  3. 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;
  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. to complex the cations from the sample;
    4. dissolution of acids;
  5. 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;

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 removing the ions of Al3+;
    3. for obtaining a red color complex;
    4. for ensuring the necessary pH, for the reaction;
  2. The oxidation state, which pass into solution, analyzed metal ions are:
    1. Fe2+; Ni1+; Cu1+; Zn3+; Co2+; Cr6+
    2. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
    3. Fe2+; Ni3+; Cu1+; Zn3+; Co3+; Cr2+
    4. Fe3+; Ni2+; Cu2+; Zn2+; Co2+; Cr3+
  3. The filter paper was acidified before analysis for:
    1. dissolution of hard soluble hydroxides;
    2. dissolution of acids;
    3. to remove the cations from the analyzed sample;
    4. to complex the cations from the sample;
  4. 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;
  5. When identify lead, is obtain a:
    1. violet complex;
    2. red-brown complex;
    3. yellow complex;
    4. blue 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. analysis samples and electrolyte solution;
    4. the anode, cathode, and samples;
  2. 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;
  3. In the experiment of nickelling:
    1. nickel sulfate solution is weakly electrically conductive;
    2. with as nickel sulfate solution is more concentrated, the more nickel is deposited on the cathode;
    3. nickel anode is consumed;
    4. iron from the cathode move in solution, replacing the nickel to be deposited;
  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 the anode because at the anode oxidation processes take place;
    3. as a cathode because at the cathode oxidation processes take place;
    4. as a cathode because at the cathode reduction processes take place;
  5. In order to determine porosity:
    1. steel plate weigh;
    2. include pores of the filter paper obtained by contact with steel plate;
    3. steel sample is cleaned with filter paper;
    4. degrease steel plate in potassium chloride;

Final laboratory test

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Protection of metals by nickelling

  1. 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 inserted into sulfuric acid, to clean;
    4. is introduced in milk of lime solution for degreasing;
  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. with as nickel sulfate solution is more concentrated, the more nickel is deposited on the cathode;
    2. nickel anode is consumed;
    3. nickel sulfate solution is weakly electrically conductive;
    4. iron from the cathode move in solution, replacing the nickel to be deposited;
  4. Theoretical mass of nickel deposited is calculated using:
    1. perfect gas law;
    2. none of the answers are correct;
    3. solutions laws;
    4. law of mass action;
  5. To determine the current efficiency, brass plate:
    1. is weighed only after the electrolysis process takes place;
    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 degreased in sulfuric acid;

Final laboratory test

Do not use this paper to give answers!

Protection of metals by nickelling

  1. 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;
  2. An electrolysis cell consists of:
    1. the anode, cathode, electrolyte solution, current source;
    2. analysis samples and electrolyte solution;
    3. two electrodes and filter paper;
    4. the anode, cathode, and samples;
  3. When is submitted the sample to the electrolysis process, this:
    1. is inserted into sulfuric acid, to clean;
    2. is introduced in natrium chloride for degreasing;
    3. is introduced in milk of lime solution for degreasing;
    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 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;
  5. 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;

Final laboratory test

Do not use this paper to give answers!

Protection of metals by nickelling

  1. In order to determine porosity:
    1. degrease steel plate in potassium chloride;
    2. steel plate weigh;
    3. include pores of the filter paper obtained by contact with steel plate;
    4. steel sample is cleaned with filter paper;
  2. Theoretical mass of nickel deposited is calculated using:
    1. perfect gas law;
    2. none of the answers are correct;
    3. solutions laws;
    4. law of mass action;
  3. 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 only after the electrolysis process takes place;
    3. is weighed before and after immersion in the electrolytic bath;
    4. is degreased in sulfuric acid;
  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. degreasing is not necessary because the oil stains do not affect the electrolysis process;
    4. is inserted into sulfuric acid, to clean;
  5. 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;

Final laboratory test

Do not use this paper to give answers!

Protection of metals by nickelling

  1. 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 the anode because at the anode reduction processes take place;
    4. as a cathode because at the cathode oxidation processes take place;
  2. Theoretical mass of nickel deposited is calculated using:
    1. perfect gas law;
    2. none of the answers are correct;
    3. law of mass action;
    4. solutions laws;
  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 inserted into sulfuric acid, to clean;
    3. is introduced in milk of lime solution for degreasing;
    4. is introduced in natrium chloride for degreasing;
  4. 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. with as nickel sulfate solution is more concentrated, the more nickel is deposited on the cathode;
    4. nickel anode is consumed;
  5. 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;

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. Which of the models studied approximates best diffusion:
    1. speeds and/or energy to fashion;
    2. none of the answers are correct;
    3. speeds and/or energy mean;
    4. speeds and/or quadratic energy;
  3. Diffusion rates are calculated from:
    1. average energy and time report;
    2. diffusion coefficients and time report;
    3. measured distances and time report;
    4. molecular speeds and energies media report;
  4. 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;
  5. Which parameters were identical, at the diffusion, of NH3 and HCl:
    1. temperature and concentration;
    2. the time of diffusion and concentration;
    3. temperature and time of diffusion;
    4. the weigh of pads and concentration;

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. identify the largest absolute difference between diffusion coefficients ratios;
    3. not distinguish between gear ratios because it shows no importance;
    4. identify the smallest absolute difference between gear ratios;
  2. Which parameters were identical, at the diffusion, of NH3 and HCl:
    1. temperature and concentration;
    2. the time of diffusion and concentration;
    3. temperature and time of diffusion;
    4. the weigh of pads and concentration;
  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. Diffusion rates are calculated from:
    1. average energy and time report;
    2. measured distances and time report;
    3. diffusion coefficients and time report;
    4. molecular speeds and energies media report;
  5. 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 quadratic energy;
    4. speeds and/or energy mean;

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