Final laboratory test

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Water analysis

  1. Water softening is based on passing the water on:
    1. distillation columns;
    2. fractionation columns;
    3. ion exchange columns;
    4. cooling columns;
  2. 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;
  3. At the titration of water samples:
    1. the burette reads only at the start of titration process;
    2. is added sulphuric acid in the samples;
    3. does not need to be read the burette;
    4. the burette reads before the start of titration and at the end of titration;
  4. When is determining temporary hardness titration of water samples is made:
    1. with sulphuric acid in the presence of methyl orange until the appearance of brown color;
    2. with sodium hydroxide in the presence of phenolphthalein until the appearance of pink color;
    3. with potasium hydroxide;
    4. with clorhidric acid in the presence of methyl orange until the appearance of orange color;
  5. The acidity of the water is due to:
    1. all minerals dissolved in water;
    2. hydroxides from water;
    3. only insoluble salts;
    4. free carbon dioxide, mineral acids and salts of strong acids with weak bases;

Final laboratory test

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Water analysis

  1. When is determining temporary hardness titration of water samples is made:
    1. with clorhidric acid in the presence of methyl orange until the appearance of orange color;
    2. with sodium hydroxide in the presence of phenolphthalein until the appearance of pink color;
    3. with sulphuric acid in the presence of methyl orange until the appearance of brown color;
    4. with potasium hydroxide;
  2. 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 sulphuric acid in presence of ERIO T;
    4. are titrated with natrium hydroxide in presence of phenolphthalein;
  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 determination of the cations from water
    3. was intended water purification;
    4. was aimed at the determination of alkalinity;
  4. The acidity of the water is due to:
    1. free carbon dioxide, mineral acids and salts of strong acids with weak bases;
    2. all minerals dissolved in water;
    3. only insoluble salts;
    4. hydroxides from water;
  5. 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. does not need to be read the burette;
    4. is added sulphuric acid in the samples;

Final laboratory test

Do not use this paper to give answers!

Water analysis

  1. Water softening is based on passing the water on:
    1. distillation columns;
    2. fractionation columns;
    3. cooling columns;
    4. ion exchange columns;
  2. 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 natrium hydroxide in presence of phenolphthalein;
    3. are titrated with sulphuric acid in presence of ERIO T;
    4. none of the answers are correct;
  3. The acidity of the water is due to:
    1. all minerals dissolved in water;
    2. only insoluble salts;
    3. free carbon dioxide, mineral acids and salts of strong acids with weak bases;
    4. hydroxides from water;
  4. 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;
  5. 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;

Final laboratory test

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Water analysis

  1. At the determination of total hardness in water sample:
    1. ia added oxalic acid and then the sample is titrated with permanganate solution;
    2. just add ERIO T and titrate;
    3. is directly titrated with EDTA solution;
    4. is formed a blue color complex after titration;
  2. 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 aimed at determination of the cations from water
    4. was intended water purification;
  3. Water softening is based on passing the water on:
    1. ion exchange columns;
    2. cooling columns;
    3. fractionation columns;
    4. distillation columns;
  4. When is determining temporary hardness titration of water samples is made:
    1. with sulphuric acid in the presence of methyl orange until the appearance of brown color;
    2. with sodium hydroxide in the presence of phenolphthalein until the appearance of pink color;
    3. with clorhidric acid in the presence of methyl orange until the appearance of orange color;
    4. with potasium hydroxide;
  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 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;
  2. At the determination of total hardness in water sample:
    1. ia added oxalic acid and then the sample is titrated with permanganate solution;
    2. is formed a blue color complex after titration;
    3. just add ERIO T and titrate;
    4. is directly titrated with EDTA solution;
  3. 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;
  4. Water softening is based on passing the water on:
    1. cooling columns;
    2. distillation columns;
    3. ion exchange columns;
    4. fractionation columns;
  5. 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 clorhidric acid in the presence of methyl orange until the appearance of orange color;
    4. with sulphuric acid in the presence of methyl orange until the appearance of brown 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 increasing the oxidation number;
    3. donation of electrons, and decreasing the oxidation number;
    4. acceptance of electrons, and increasing the oxidation number;
  2. 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;
  3. 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. decrease the reaction rate;
    4. trigger and speed up the reaction;
  4. 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 working procedure of laboratory work;
    4. its actual titer reads from the reagent bottle label;
  5. Reactions between acids and bases:
    1. have as a consequence the dissolution of a salt;
    2. are always fast, taking place almost instantaneously;
    3. are all exothermic;
    4. have as a consequence the formation of a quantity of water;

Final laboratory test

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Solution concentration

  1. 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. have as a consequence the dissolution of a salt;
    4. are all exothermic;
  2. Titration is a laboratory operation, which is performed in the presence of:
    1. natrium hydroxide;
    2. sulphuric acid;
    3. a pH indicator that changes color depending on the pH of the solution;
    4. a salt;
  3. Changing the color of pH indicator shows that:
    1. titration process should be continued;
    2. equivalent point;
    3. resumption of titration;
    4. does not have any effect on the process of titration;
  4. The oxidation is the process of:
    1. acceptance of electrons, and increasing the oxidation number;
    2. donation of electrons, and increasing the oxidation number;
    3. acceptance of electrons, and decreasing the oxidation number;
    4. donation of electrons, and decreasing the oxidation number;
  5. 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;

Final laboratory test

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Solution concentration

  1. 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;
  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 decreasing the oxidation number;
    4. donation of electrons, and increasing the oxidation number;
  3. Acid-base titration of the three samples of sulfuric acid with sodium hydroxide, is carried out until the appearance of:
    1. the yellow color;
    2. none of the answers are correct;
    3. the orange color;
    4. the dark-brown color;
  4. In the calculation, of oxalic acid factor solution:
    1. its actual titer reads from the working procedure of laboratory work;
    2. its actual titer reads from the reagent bottle label;
    3. its actual titer reads before and after the titration from the burette;
    4. it is not necessary to read the real titer;
  5. 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;

Final laboratory test

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Solution concentration

  1. 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 always fast, taking place almost instantaneously;
    4. are all exothermic;
  2. The oxidation is the process of:
    1. acceptance of electrons, and increasing the oxidation number;
    2. donation of electrons, and increasing the oxidation number;
    3. acceptance of electrons, and decreasing the oxidation number;
    4. donation of electrons, and decreasing the oxidation number;
  3. Acid-base titration of the three samples of sulfuric acid with sodium hydroxide, is carried out until the appearance of:
    1. the orange color;
    2. the yellow color;
    3. the dark-brown color;
    4. none of the answers are correct;
  4. 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;
  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. Titration is a laboratory operation, which is performed in the presence of:
    1. natrium hydroxide;
    2. sulphuric acid;
    3. a pH indicator that changes color depending on the pH of the solution;
    4. a salt;
  2. 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. The oxidation is the process of:
    1. donation of electrons, and decreasing the oxidation number;
    2. acceptance of electrons, and increasing the oxidation number;
    3. acceptance of electrons, and decreasing the oxidation number;
    4. donation of electrons, and increasing the oxidation number;
  4. Changing the color of pH indicator shows that:
    1. equivalent point;
    2. does not have any effect on the process of titration;
    3. resumption of titration;
    4. titration process should be continued;
  5. 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 all exothermic;
    4. are always fast, taking place almost instantaneously;

Final laboratory test

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Metal corrosion

  1. In the gravimetric method, aluminum plate:
    1. is degreased in sodium hydroxide solution;
    2. is not necessary, weighing the aluminum sample;
    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. Corrosion of metals is:
    1. the destruction of metals under the action of external factors;
    2. a beneficial process that shows the stability of metals;
    3. the cleaning of metals;
    4. the protection in time to chemical agents;
  4. Resistance grouping of the two samples studied in the laboratory is based on:
    1. the value of penetration index;
    2. their mass;
    3. their size, and time that are subject to chemical agents;
    4. the surface of the samples;
  5. At the volumetric method:
    1. is not required, weighing the sample of zinc;
    2. the sample size of zinc are measured, and then weighed the sample;
    3. degrease the sample in sulfuric acid solution;
    4. weigh the zinc before and after the process takes place;

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

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

Final laboratory test

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Metal corrosion

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

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. 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. Fe2+; Ni1+; Cu1+; Zn3+; Co2+; Cr6+
  2. 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;
  3. 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;
  4. When identify aluminum, ammonium hydroxide was added:
    1. for stopping the reaction;
    2. for ensuring the necessary pH, for the reaction;
    3. for removing the ions of Al3+;
    4. for obtaining a red color complex;
  5. 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;

Final laboratory test

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Metal alloys analysis

  1. The electrograf consists of:
    1. current source and the sample;
    2. filter paper and the sample;
    3. current source and the filter paper;
    4. none of the answers are correct;
  2. The oxidation state, which pass into solution, analyzed metal ions are:
    1. Fe2+; Ni1+; Cu1+; Zn3+; Co2+; Cr6+
    2. Fe2+; Ni3+; Cu1+; Zn3+; Co3+; Cr2+
    3. Fe3+; Ni2+; Cu2+; Zn2+; Co2+; Cr3+
    4. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
  3. The filter paper was acidified before analysis for:
    1. dissolution of acids;
    2. to complex the cations from the sample;
    3. dissolution of hard soluble hydroxides;
    4. to remove the cations from the analyzed sample;
  4. When identify lead, is obtain a:
    1. yellow complex;
    2. red-brown complex;
    3. violet complex;
    4. blue complex;
  5. 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;

Final laboratory test

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Metal alloys analysis

  1. When identify lead, is obtain a:
    1. violet complex;
    2. yellow complex;
    3. blue complex;
    4. red-brown complex;
  2. 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;
  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. Fe3+; Ni2+; Cu2+; Zn2+; Co2+; Cr3+
    3. Fe2+; Ni1+; Cu1+; Zn3+; Co2+; Cr6+
    4. Fe2+; Ni3+; Cu1+; Zn3+; Co3+; Cr2+
  4. This method of analysis of metal alloys is:
    1. a nondestructive method of analysis;
    2. a quantitative method of analysis;
    3. a gravimetric method of analysis;
    4. destructive method of analysis;
  5. 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;

Final laboratory test

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Metal alloys analysis

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

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 ensuring the necessary pH, for the reaction;
    4. for removing the ions of Al3+;
  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. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
    4. Fe2+; Ni1+; Cu1+; Zn3+; Co2+; Cr6+
  3. This method of analysis of metal alloys is:
    1. a nondestructive method of analysis;
    2. a quantitative method of analysis;
    3. destructive method of analysis;
    4. a gravimetric method of analysis;
  4. When identify lead, is obtain a:
    1. violet complex;
    2. yellow complex;
    3. blue complex;
    4. red-brown complex;
  5. 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;

Final laboratory test

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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. 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 before and after immersion in the electrolytic bath;
    4. is weighed only after the electrolysis process takes place;
  3. 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;
  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 reduction processes take place;
    4. as a cathode because at the cathode oxidation processes take place;
  5. When is submitted the sample to the electrolysis process, this:
    1. is introduced in milk of lime solution 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 natrium chloride for degreasing;

Final laboratory test

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Protection of metals by nickelling

  1. In the experiment of nickelling:
    1. nickel sulfate solution is weakly electrically conductive;
    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 anode is consumed;
  2. 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 a cathode because at the cathode oxidation processes take place;
    4. as the anode because at the anode oxidation processes take place;
  3. An electrolysis cell consists of:
    1. analysis samples and electrolyte solution;
    2. two electrodes and filter paper;
    3. the anode, cathode, electrolyte solution, current source;
    4. the anode, cathode, and samples;
  4. 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;
  5. 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;

Final laboratory test

Do not use this paper to give answers!

Protection of metals by nickelling

  1. Theoretical mass of nickel deposited is calculated using:
    1. perfect gas law;
    2. law of mass action;
    3. none of the answers are correct;
    4. solutions laws;
  2. 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;
  3. 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 the anode because at the anode oxidation processes take place;
    4. as a cathode because at the cathode reduction processes take place;
  4. 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;
  5. An electrolysis cell consists of:
    1. the anode, cathode, and samples;
    2. two electrodes and filter paper;
    3. analysis samples and electrolyte solution;
    4. the anode, cathode, electrolyte solution, current source;

Final laboratory test

Do not use this paper to give answers!

Protection of metals by nickelling

  1. Theoretical mass of nickel deposited is calculated using:
    1. none of the answers are correct;
    2. solutions laws;
    3. perfect gas law;
    4. law of mass action;
  2. 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. iron from the cathode move in solution, replacing the nickel to be deposited;
    4. nickel sulfate solution is weakly electrically conductive;
  3. To determine the current efficiency, brass plate:
    1. is weighed before and after immersion in the electrolytic bath;
    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 degreased in sulfuric acid;
  4. An electrolysis cell consists of:
    1. the anode, cathode, electrolyte solution, current source;
    2. analysis samples and electrolyte solution;
    3. the anode, cathode, and samples;
    4. two electrodes and filter paper;
  5. 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 a cathode because at the cathode reduction processes take place;
    3. as the anode because at the anode oxidation processes take place;
    4. as the anode because at the anode reduction processes take place;

Final laboratory test

Do not use this paper to give answers!

Protection of metals by nickelling

  1. 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;
  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. 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;
  4. An electrolysis cell consists of:
    1. the anode, cathode, and samples;
    2. two electrodes and filter paper;
    3. analysis samples and electrolyte solution;
    4. the anode, cathode, electrolyte solution, current source;
  5. 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 a cathode because at the cathode oxidation processes take place;
    4. as the anode because at the anode oxidation processes take place;

Final laboratory test

Do not use this paper to give answers!

The study of difusion in gazeous state and molecular rates

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

Final laboratory test

Do not use this paper to give answers!

The study of difusion in gazeous state and molecular rates

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

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. 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;
  3. 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;
  4. 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;
  5. 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;

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. 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 gear ratios;
  2. Diffusion rates are calculated from:
    1. diffusion coefficients and time report;
    2. average energy and time report;
    3. measured distances and time report;
    4. molecular speeds and energies media report;
  3. 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;
  4. 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 ends of the glass tube, to the form ring;
    4. from the two rubber plugs to the ring formed;
  5. 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, placed on line, in the glass tube and start the timer;
    4. the two pads moistened are introduced simultaneously in the glass tube and stop the timer;

Final laboratory test

Do not use this paper to give answers!

The study of difusion in gazeous state and molecular rates

  1. Measuring the distances, is as follows:
    1. from the two rubber plugs to the ring formed;
    2. from the two 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;
  2. 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. temperature and concentration;
    4. the time of diffusion and concentration;
  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. not distinguish between gear ratios because it shows no importance;
    3. identify the largest absolute difference between diffusion coefficients ratios;
    4. identify the largest absolute difference between gear ratios;
  4. 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;
  5. Diffusion rates are calculated from:
    1. diffusion coefficients and time report;
    2. molecular speeds and energies media report;
    3. average energy and time report;
    4. measured distances and time report;