Final laboratory test

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Water analysis

  1. 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;
  2. Water softening is based on passing the water on:
    1. fractionation columns;
    2. cooling columns;
    3. distillation columns;
    4. ion exchange columns;
  3. In order to determine the acidity of decationized water, the samples:
    1. none of the answers are correct;
    2. are titrated with natrium hydroxide in presence of phenolphthalein;
    3. are titrated with sulphuric acid in presence of ERIO T;
    4. are titrated with hydrochloric acid in presence of methyl orange;
  4. 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;
  5. 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 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. At the titration of water samples:
    1. the burette reads before the start of titration and at the end of titration;
    2. does not need to be read the burette;
    3. is added sulphuric acid in the samples;
    4. the burette reads only at the start of titration process;
  2. In order to determine the acidity of decationized water, the samples:
    1. are titrated with natrium hydroxide in presence of phenolphthalein;
    2. none of the answers are correct;
    3. are titrated with sulphuric acid in presence of ERIO T;
    4. are titrated with hydrochloric acid in presence of methyl orange;
  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 intended water purification;
    3. was aimed at determination of the cations from water
    4. was aimed at the determination of alkalinity;
  4. The acidity of the water is due to:
    1. hydroxides from water;
    2. free carbon dioxide, mineral acids and salts of strong acids with weak bases;
    3. all minerals dissolved in water;
    4. only insoluble salts;
  5. Water softening is based on passing the water on:
    1. fractionation columns;
    2. cooling columns;
    3. ion exchange columns;
    4. distillation columns;

Final laboratory test

Do not use this paper to give answers!

Water analysis

  1. 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;
  2. 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;
  3. The experiment for the analysis of drinking water:
    1. was aimed at determination of the cations from water
    2. was intended water purification;
    3. was aimed, at the wareness of the risks to which we expose drinking tap water;
    4. was aimed at the determination of alkalinity;
  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 clorhidric acid in the presence of methyl orange until the appearance of orange color;
    3. with potasium hydroxide;
    4. with sodium hydroxide in the presence of phenolphthalein until the appearance of pink color;
  5. The acidity of the water is due to:
    1. hydroxides from water;
    2. all minerals dissolved in water;
    3. only insoluble salts;
    4. free carbon dioxide, mineral acids and salts of strong acids with weak bases;

Final laboratory test

Do not use this paper to give answers!

Water analysis

  1. 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. all minerals dissolved in water;
    4. hydroxides from water;
  2. The experiment for the analysis of drinking water:
    1. was aimed, at the wareness of the risks to which we expose drinking tap water;
    2. was intended water purification;
    3. was aimed at determination of the cations from water
    4. was aimed at the determination of alkalinity;
  3. At the determination of total hardness in water sample:
    1. is formed a blue color complex after titration;
    2. ia added oxalic acid and then the sample is titrated with permanganate solution;
    3. just add ERIO T and titrate;
    4. is directly titrated with EDTA solution;
  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 sulphuric acid in presence of ERIO T;
    3. are titrated with hydrochloric acid in presence of methyl orange;
    4. none of the answers are correct;
  5. At the titration of water samples:
    1. is added sulphuric acid in the samples;
    2. does not need to be read the burette;
    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;

Final laboratory test

Do not use this paper to give answers!

Water analysis

  1. The acidity of the water is due to:
    1. hydroxides from water;
    2. free carbon dioxide, mineral acids and salts of strong acids with weak bases;
    3. only insoluble salts;
    4. all minerals dissolved in water;
  2. 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;
  3. Water softening is based on passing the water on:
    1. ion exchange columns;
    2. fractionation columns;
    3. distillation columns;
    4. cooling columns;
  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. the burette reads only at the start of titration process;
    4. is added sulphuric acid in the samples;
  5. 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 clorhidric acid in the presence of methyl orange until the appearance of orange color;
    3. with potasium hydroxide;
    4. with sodium hydroxide in the presence of phenolphthalein until the appearance of pink color;

Final laboratory test

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Solution concentration

  1. The oxidation is the process of:
    1. acceptance 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. donation of electrons, and increasing the oxidation number;
  2. Reactions between acids and bases:
    1. are all exothermic;
    2. have as a consequence the dissolution of a salt;
    3. have as a consequence the formation of a quantity of water;
    4. are always fast, taking place almost instantaneously;
  3. In the calculation, of oxalic acid factor solution:
    1. its actual titer reads before and after the titration from the burette;
    2. its actual titer reads from the reagent bottle label;
    3. it is not necessary to read the real titer;
    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. the orange color;
    2. none of the answers are correct;
    3. the yellow color;
    4. the dark-brown color;
  5. At the redox titration with potassium permanganate solution, the samples were heated for:
    1. has no effect;
    2. trigger and speed up the reaction;
    3. decrease the reaction rate;
    4. to stop the chemical reaction that occurs in the titration;

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 dark-brown color;
    2. the orange color;
    3. none of the answers are correct;
    4. the yellow color;
  2. In the calculation, of oxalic acid factor solution:
    1. its actual titer reads from the working procedure of laboratory work;
    2. it is not necessary to read the real titer;
    3. its actual titer reads from the reagent bottle label;
    4. its actual titer reads before and after the titration from the burette;
  3. 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;
  4. 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;
  5. At the redox titration with potassium permanganate solution, the samples were heated for:
    1. decrease the reaction rate;
    2. has no effect;
    3. to stop the chemical reaction that occurs in the titration;
    4. trigger and speed up the reaction;

Final laboratory test

Do not use this paper to give answers!

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

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 yellow color;
    2. the orange color;
    3. the dark-brown color;
    4. none of the answers are correct;
  2. 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;
  3. Reactions between acids and bases:
    1. have as a consequence the formation of a quantity of water;
    2. are always fast, taking place almost instantaneously;
    3. are all exothermic;
    4. have as a consequence the dissolution of a salt;
  4. At the redox titration with potassium permanganate solution, the samples were heated for:
    1. has no effect;
    2. to stop the chemical reaction that occurs in the titration;
    3. trigger and speed up the reaction;
    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 before and after the titration from the burette;
    4. its actual titer reads from the working procedure of laboratory work;

Final laboratory test

Do not use this paper to give answers!

Solution concentration

  1. Acid-base titration of the three samples of sulfuric acid with sodium hydroxide, is carried out until the appearance of:
    1. the orange color;
    2. none of the answers are correct;
    3. the dark-brown color;
    4. the yellow color;
  2. 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. sulphuric acid;
    4. natrium hydroxide;
  3. At the redox titration with potassium permanganate solution, the samples were heated for:
    1. has no effect;
    2. trigger and speed up the reaction;
    3. decrease the reaction rate;
    4. to stop the chemical reaction that occurs in the titration;
  4. 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;
  5. 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;

Final laboratory test

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Metal corrosion

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

Final laboratory test

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Metal corrosion

  1. When calculating the corrosion rate the surface is expressed in:
    1. cm2;
    2. dm2;
    3. m3;;
    4. m2;
  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. sample size variation per unit time;
    4. variation of the sample mass per unit area;
  3. In corrosion processes studied gas is released:
    1. only the corrosion of zinc;
    2. only the corrosion of aluminum;
    3. which is a volume that depends on the amount of metal corroded;
    4. which is a volume that does not depend on the sample surface;
  4. Corrosion of metals is:
    1. the protection in time to chemical agents;
    2. the destruction of metals under the action of external factors;
    3. the cleaning of metals;
    4. a beneficial process that shows the stability of metals;
  5. 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;

Final laboratory test

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Metal corrosion

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

Final laboratory test

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Metal corrosion

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

Final laboratory test

Do not use this paper to give answers!

Metal corrosion

  1. Corrosion of metals is:
    1. the protection in time to chemical agents;
    2. the cleaning of metals;
    3. a beneficial process that shows the stability of metals;
    4. the destruction of metals under the action of external factors;
  2. The corrosion rate is:
    1. sample size variation per unit time;
    2. variation of the sample mass, per unit time;
    3. variation of the sample mass per unit area;
    4. variation of the sample mass per unit area, per unit time;
  3. When calculating the corrosion rate the surface is expressed in:
    1. cm2;
    2. m3;;
    3. m2;
    4. dm2;
  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 aluminum;
    3. only the corrosion of zinc;
    4. which is a volume that depends on the amount of metal corroded;
  5. 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;

Final laboratory test

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Metal alloys analysis

  1. 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;
  2. This method of analysis of metal alloys is:
    1. destructive method of analysis;
    2. a quantitative method of analysis;
    3. a gravimetric method of analysis;
    4. a nondestructive 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. for stopping the chemical reaction that takes place;
    4. to be cut easily with scissors;
  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. When identify aluminum, ammonium hydroxide was added:
    1. for ensuring the necessary pH, for the reaction;
    2. for removing the ions of Al3+;
    3. for stopping 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 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 filter paper was acidified before analysis for:
    1. to complex the cations from the sample;
    2. dissolution of acids;
    3. to remove the cations from the analyzed sample;
    4. dissolution of hard soluble hydroxides;
  3. When identify lead, is obtain a:
    1. red-brown complex;
    2. blue complex;
    3. yellow complex;
    4. violet complex;
  4. 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;
  5. Why moisten the filter paper with solution of sodium nitrate?
    1. for stopping the chemical reaction that takes place;
    2. for the paper work as insulation;
    3. to be cut easily with scissors;
    4. none of the answers are correct;

Final laboratory test

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Metal alloys analysis

  1. When identify lead, is obtain a:
    1. red-brown complex;
    2. blue complex;
    3. yellow complex;
    4. violet complex;
  2. The filter paper was acidified before analysis for:
    1. dissolution of acids;
    2. to remove the cations from the analyzed sample;
    3. dissolution of hard soluble hydroxides;
    4. to complex the cations from the sample;
  3. 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;
  4. When identify aluminum, ammonium hydroxide was added:
    1. for removing the ions of Al3+;
    2. for obtaining a red color complex;
    3. for ensuring the necessary pH, for the reaction;
    4. for stopping the reaction;
  5. The oxidation state, which pass into solution, analyzed metal ions are:
    1. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
    2. Fe2+; Ni3+; Cu1+; Zn3+; Co3+; Cr2+
    3. Fe3+; Ni2+; Cu2+; Zn2+; Co2+; Cr3+
    4. Fe2+; Ni1+; Cu1+; Zn3+; Co2+; Cr6+

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 filter paper;
    3. current source and the sample;
    4. filter paper and the sample;
  2. When identify lead, is obtain a:
    1. violet complex;
    2. blue complex;
    3. yellow complex;
    4. red-brown complex;
  3. When identify aluminum, ammonium hydroxide was added:
    1. for obtaining a red color complex;
    2. for removing the ions of Al3+;
    3. for ensuring the necessary pH, for the reaction;
    4. for stopping the reaction;
  4. 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;
  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. The filter paper was acidified before analysis for:
    1. dissolution of hard soluble hydroxides;
    2. dissolution of acids;
    3. to complex the cations from the sample;
    4. to remove the cations from the analyzed sample;
  2. 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;
  3. When identify lead, is obtain a:
    1. blue complex;
    2. violet complex;
    3. yellow complex;
    4. red-brown complex;
  4. The oxidation state, which pass into solution, analyzed metal ions are:
    1. Fe3+; Ni2+; Cu2+; Zn2+; Co2+; Cr3+
    2. Fe2+; Ni3+; Cu1+; Zn3+; Co3+; Cr2+
    3. dependent on the intensity of the current applied to the electrograf and composition of the metal alloy;
    4. Fe2+; Ni1+; Cu1+; Zn3+; Co2+; Cr6+
  5. When identify aluminum, ammonium hydroxide was added:
    1. for removing the ions of Al3+;
    2. for stopping the reaction;
    3. for obtaining a red color complex;
    4. for ensuring the necessary pH, for the reaction;

Final laboratory test

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Protection of metals by nickelling

  1. 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 degreased in sulfuric acid;
    3. is weighed only after the electrolysis process takes place;
    4. is weighed before and after immersion in the electrolytic bath;
  2. In the experiment of nickelling:
    1. nickel anode is consumed;
    2. nickel sulfate solution is weakly electrically conductive;
    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;
  3. In order to determine porosity:
    1. include pores of the filter paper obtained by contact with steel plate;
    2. steel plate weigh;
    3. steel sample is cleaned with filter paper;
    4. degrease steel plate in potassium chloride;
  4. 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;
  5. Plates, which shall be deposited nickel are incorporated into the electrolysis bath:
    1. as the anode because at the anode oxidation 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 a cathode because at the cathode reduction processes take place;

Final laboratory test

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Protection of metals by nickelling

  1. An electrolysis cell consists of:
    1. the anode, cathode, and samples;
    2. analysis samples and electrolyte solution;
    3. two electrodes and filter paper;
    4. the anode, cathode, electrolyte solution, current source;
  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. 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;
  4. 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 introduced in natrium chloride for degreasing;
    4. is inserted into sulfuric acid, to clean;
  5. In the experiment of nickelling:
    1. nickel anode is consumed;
    2. iron from the cathode move in solution, replacing the nickel to be deposited;
    3. nickel sulfate solution is weakly electrically conductive;
    4. with as nickel sulfate solution is more concentrated, the more nickel is deposited on the cathode;

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. 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;
  3. An electrolysis cell consists of:
    1. the anode, cathode, electrolyte solution, current source;
    2. two electrodes and filter paper;
    3. the anode, cathode, and samples;
    4. analysis samples and electrolyte solution;
  4. Plates, which shall be deposited nickel are incorporated into the electrolysis bath:
    1. as a cathode because at the cathode oxidation processes take place;
    2. as the anode because at the anode oxidation processes take place;
    3. as the anode because at the anode reduction processes take place;
    4. as a cathode because at the cathode reduction processes take place;
  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. An electrolysis cell consists of:
    1. the anode, cathode, and samples;
    2. the anode, cathode, electrolyte solution, current source;
    3. two electrodes and filter paper;
    4. analysis samples and electrolyte solution;
  2. 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 introduced in natrium chloride for degreasing;
    4. is inserted into sulfuric acid, to clean;
  3. Theoretical mass of nickel deposited is calculated using:
    1. none of the answers are correct;
    2. law of mass action;
    3. solutions laws;
    4. perfect gas law;
  4. Plates, which shall be deposited nickel are incorporated into the electrolysis bath:
    1. as a cathode because at the cathode oxidation processes take place;
    2. as the anode because at the anode oxidation processes take place;
    3. as the anode because at the anode reduction processes take place;
    4. as a cathode because at the cathode reduction processes take place;
  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

Do not use this paper to give answers!

Protection of metals by nickelling

  1. To determine the current efficiency, brass plate:
    1. it is not required, weighing the plate because is determined the porosity of this sample;
    2. is weighed before and after immersion in the electrolytic bath;
    3. is weighed only after the electrolysis process takes place;
    4. is degreased in sulfuric acid;
  2. 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;
  3. Theoretical mass of nickel deposited is calculated using:
    1. law of mass action;
    2. solutions laws;
    3. none of the answers are correct;
    4. perfect gas law;
  4. 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;
  5. When is submitted the sample to the electrolysis process, this:
    1. is inserted into sulfuric acid, to clean;
    2. degreasing is not necessary because the oil stains do not affect the electrolysis process;
    3. is introduced in milk of lime solution for degreasing;
    4. is introduced in natrium chloride for degreasing;

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

Final laboratory test

Do not use this paper to give answers!

The study of difusion in gazeous state and molecular rates

  1. Measuring the distances, is as follows:
    1. from the two rubber plugs to the ring formed;
    2. from the two spots with HCl and NH3 respectively, to form NH4Cl ring;
    3. from the two ends of the glass tube, to the form ring;
    4. none of the answers are correct;
  2. 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;
  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. 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;
  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. After NH3 and HCl molecules diffuse:
    1. must be clean the tube to leave the workplace clean;
    2. all other answers are correct;
    3. the gas discharge occurs in the tube;
    4. there is a chemical reaction to form ammonium chloride (NH4Cl);

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. 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;
  2. For accurate measurement of diffusion time:
    1. the two pads moistened, placed on line, in the glass tube and start the timer;
    2. the two pads moistened are introduced simultaneously in the glass tube and start the timer;
    3. the two pads moistened are introduced simultaneously in the glass tube and stop the timer;
    4. the two pads moistened are introduced at a certain time, into the glass tube and then stop the timer;
  3. Diffusion rates are calculated from:
    1. average energy and time report;
    2. measured distances and time report;
    3. molecular speeds and energies media report;
    4. diffusion coefficients and time report;
  4. 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. Measuring the distances, is as follows:
    1. from the two spots with HCl and NH3 respectively, to form NH4Cl ring;
    2. from the two ends of the glass tube, to the form ring;
    3. from the two rubber plugs to the ring formed;
    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. Measuring the distances, is as follows:
    1. from the two spots with HCl and NH3 respectively, to form NH4Cl ring;
    2. from the two ends of the glass tube, to the form ring;
    3. none of the answers are correct;
    4. from the two rubber plugs to the ring formed;
  2. After NH3 and HCl molecules diffuse:
    1. all other answers are correct;
    2. the gas discharge occurs in the tube;
    3. must be clean the tube to leave the workplace clean;
    4. there is a chemical reaction to form ammonium chloride (NH4Cl);
  3. For accurate measurement of diffusion time:
    1. the two pads moistened, placed on line, in the glass tube and start the timer;
    2. the two pads moistened are introduced simultaneously in the glass tube and stop 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 start the timer;
  4. 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;
  5. 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;

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, placed on line, 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 are introduced at a certain time, into the glass tube and then stop the timer;
  2. Which parameters were identical, at the diffusion, of NH3 and HCl:
    1. temperature and time of diffusion;
    2. the weigh of pads and concentration;
    3. the time of diffusion and concentration;
    4. temperature and concentration;
  3. 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 ends of the glass tube, to the form ring;
    4. from the two spots with HCl and NH3 respectively, to form NH4Cl ring;
  4. 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);
  5. The diffusion model of the two species (NH3 and HCl) is chosen as follows:
    1. not distinguish between gear ratios because it shows no importance;
    2. identify the largest absolute difference between gear ratios;
    3. identify the smallest absolute difference between gear ratios;
    4. identify the largest absolute difference between diffusion coefficients ratios;