Question 1

Electrometallurgy uses _________________ to separate a metal from its ore.

Accepted Answer

A)   solid phase chemical properties
B)   electrical processes
C)   thermal processes
D)   aqueous chemical processes
E)   molten salt processesF) A) and B)
G) A) and E)

Question 2

Sulfur trioxide is the anhydride of sulfuric acid. However, SO3 is not added directly to water during the synthesis of sulfuric acid because

Accepted Answer

A)   hydration of SO3 is very exothermic and difficult to control.
B)   hydration of SO3 is very endothermic and proceeds too slowly to be profitable.
C)   at high temperatures water vapor catalyzes polymerization of SO3.
D)   vapor phase sulfuric acid is corrosive and limits the useful life of the reactor.
E)   the water would decompose under such conditions.F) B) and C)
G) A) and E)

Question 3

Electrolysis is used as the last step in isolating pure __________________.

Accepted Answer

A)   iron
B)   boron
C)   aluminum
D)   selenium
E)   carbonF) A) and C)
G) A) and D)

Question 4

The kinetic isotope effect is the basis for

Accepted Answer

A)   the radioactivity of tritium.
B)   isolation of pure D2O.
C)   tritium's high reactivity.
D)   the increase in boiling point when comparing hydrogen, deuterium, and tritium.
E)   nuclear power generation.F) A) and E)
G) A) and B)

Question 5

In the electrolysis of water, the hydrogen gas evolved at the cathode is enriched in deuterium (hydrogen-2), compared to the more common isotope, protium (hydrogen-1).

Accepted Answer

A) True 
 B)False

Question 6

The chlor-alkali process produces chlorine, Cl2(g) , in large quantities. What other industrially important substances are produced in this process?

Accepted Answer

A)   Na(s) , H2(g) 
B)   H2(g) , O2(g) 
C)   Hg(l) , NaCl(s) 
D)   Na(s) , O2(g) 
E)   NaOH(aq) , H2(g) F) None of the above
G) B) and C)

Question 7

The debris accompanying a mineral is called

Accepted Answer

A)   slag.
B)   gangue.
C)   ore.
D)   halite.
E)   ash.F) A) and E)
G) A) and D)

Question 8

The main effect of the biosphere on the chemistry of the earth's crust has been to

Accepted Answer

A)   create a reducing atmosphere.
B)   create an oxidizing atmosphere.
C)   increase the relative humidity.
D)   decrease the relative humidity.
E)   increase the level of atmospheric carbon dioxide.F) A) and D)
G) B) and E)

Question 9

The process in which a gaseous substance is converted into a condensed, more usable chemical substance is called

Accepted Answer

A)   differentiation.
B)   liquefaction.
C)   fixation.
D)   deposition.
E)   remediation.F) A) and E)
G) C) and D)

Question 10

What gas is produced at the anode in the Hall-Heroult process for the electrolytic production of aluminum?

Accepted Answer

The answer of What gas is produced at the anode...

Question 11

Potassium is produced industrially by the reaction
Na(l) + K+(l)  Na+(l) + K(g)
The reaction is carried out at 850°C, but the equilibrium Kc constant strongly favors the reactants. Explain how the conditions are manipulated to ensure a good yield of potassium despite the small value of Kc.

Accepted Answer

The gaseous potassium product ...

Question 12

Compared to the asbestos diaphragm-cell used in the chlor-alkali process, list
a. one main advantage and one disadvantage of mercury cells.
b. two important advantages of polymer membrane-cells.

Accepted Answer

a. Purer NaOH product is forme...

Question 13

Hydrometallurgy uses __________________ to separate a metal from its ore.

Accepted Answer

A)   solid phase chemical properties
B)   electrical processes
C)   thermal processes
D)   aqueous chemical processes
E)   molten salt processesF) B) and E)
G) B) and C)

Question 14

The process used to produce silicon with a purity of more than 99.999999% is called

Accepted Answer

A)   zone refining.
B)   electrorefining.
C)   distillation.
D)   sublimation.
E)   alloying.F) A) and D)
G) A) and C)

Question 15

What gas is produced at the anode in the Downs cell, in which molten NaCl is electrolyzed?

Accepted Answer

The answer of What gas is produced at the anode...

Question 16

Hydrogen displays the largest kinetic isotope effect of all the elements.

Accepted Answer

A) True 
 B)False

Question 17

Plants extract phosphate from the soil

Accepted Answer

A)   by converting it to the dihydrogen phosphate ion by addition of acid to the soil near roots.
B)   by converting it to phosphoric acid.
C)   by osmosis.
D)   by leaching.
E)   by fixation.F) B) and C)
G) C) and D)

Exam 22: The Elements in Nature and Industry

The process used to produce silicon with a purity of more than 99.999999% is called

Correct Answer
verified

Plants extract phosphate from the soil

Correct Answer
verified

The main effect of the biosphere on the chemistry of the earth's crust has been to

Correct Answer
verified

What gas is produced at the anode in the Hall-Heroult process for the electrolytic production of aluminum?

Correct Answer
verified

What gas is produced at the anode in the Downs cell, in which molten NaCl is electrolyzed?

Correct Answer
verified

Compared to the asbestos diaphragm-cell used in the chlor-alkali process, list a. one main advantage and one disadvantage of mercury cells. b. two important advantages of polymer membrane-cells.

Correct Answer
verified
a. Purer NaOH product is forme...
View Answer

Hydrogen displays the largest kinetic isotope effect of all the elements.

Correct Answer
verified

Hydrometallurgy uses __________________ to separate a metal from its ore.

Correct Answer
verified

The process in which a gaseous substance is converted into a condensed, more usable chemical substance is called

Correct Answer
verified

Potassium is produced industrially by the reaction Na(l) + K⁺(l) Na⁺(l) + K(g) The reaction is carried out at 850°C, but the equilibrium K_c constant strongly favors the reactants. Explain how the conditions are manipulated to ensure a good yield of potassium despite the small value of K_c.

Correct Answer
verified
The gaseous potassium product ...
View Answer

The kinetic isotope effect is the basis for

Correct Answer
verified

Sulfur trioxide is the anhydride of sulfuric acid. However, SO₃is not added directly to water during the synthesis of sulfuric acid because

Correct Answer
verified

Electrometallurgy uses _________________ to separate a metal from its ore.

Correct Answer
verified

Electrolysis is used as the last step in isolating pure __________________.

Correct Answer
verified

The chlor-alkali process produces chlorine, Cl₂(g) , in large quantities. What other industrially important substances are produced in this process?

Correct Answer
verified

The debris accompanying a mineral is called

Correct Answer
verified

In the electrolysis of water, the hydrogen gas evolved at the cathode is enriched in deuterium (hydrogen-2), compared to the more common isotope, protium (hydrogen-1).

Correct Answer
verified

Exam 22: The Elements in Nature and Industry

The process used to produce silicon with a purity of more than 99.999999% is called

Correct AnswerverifiedShow Answer

Plants extract phosphate from the soil

Correct AnswerverifiedShow Answer

The main effect of the biosphere on the chemistry of the earth's crust has been to

Correct AnswerverifiedShow Answer

What gas is produced at the anode in the Hall-Heroult process for the electrolytic production of aluminum?

Correct AnswerverifiedShow Answer

What gas is produced at the anode in the Downs cell, in which molten NaCl is electrolyzed?

Correct AnswerverifiedShow Answer

Compared to the asbestos diaphragm-cell used in the chlor-alkali process, list a. one main advantage and one disadvantage of mercury cells. b. two important advantages of polymer membrane-cells.

Correct Answerverifieda. Purer NaOH product is forme...View AnswerShow Answer

Hydrogen displays the largest kinetic isotope effect of all the elements.

Correct AnswerverifiedShow Answer

Hydrometallurgy uses __________________ to separate a metal from its ore.

Correct AnswerverifiedShow Answer

The process in which a gaseous substance is converted into a condensed, more usable chemical substance is called

Correct AnswerverifiedShow Answer

Potassium is produced industrially by the reaction Na(l) + K+(l) Na+(l) + K(g) The reaction is carried out at 850°C, but the equilibrium Kc constant strongly favors the reactants. Explain how the conditions are manipulated to ensure a good yield of potassium despite the small value of Kc.

Correct AnswerverifiedThe gaseous potassium product ...View AnswerShow Answer

The kinetic isotope effect is the basis for

Correct AnswerverifiedShow Answer

Sulfur trioxide is the anhydride of sulfuric acid. However, SO3 is not added directly to water during the synthesis of sulfuric acid because

Correct AnswerverifiedShow Answer

Electrometallurgy uses _________________ to separate a metal from its ore.

Correct AnswerverifiedShow Answer

Electrolysis is used as the last step in isolating pure __________________.

Correct AnswerverifiedShow Answer

The chlor-alkali process produces chlorine, Cl2(g) , in large quantities. What other industrially important substances are produced in this process?

Correct AnswerverifiedShow Answer

The debris accompanying a mineral is called

Correct AnswerverifiedShow Answer

In the electrolysis of water, the hydrogen gas evolved at the cathode is enriched in deuterium (hydrogen-2), compared to the more common isotope, protium (hydrogen-1).

Correct AnswerverifiedShow Answer

Correct Answer
verified

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
verified
a. Purer NaOH product is forme...
View Answer

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Potassium is produced industrially by the reaction Na(l) + K⁺(l) Na⁺(l) + K(g) The reaction is carried out at 850°C, but the equilibrium K_c constant strongly favors the reactants. Explain how the conditions are manipulated to ensure a good yield of potassium despite the small value of K_c.

Correct Answer
verified
The gaseous potassium product ...
View Answer

Correct Answer
verified

Sulfur trioxide is the anhydride of sulfuric acid. However, SO₃is not added directly to water during the synthesis of sulfuric acid because

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

The chlor-alkali process produces chlorine, Cl₂(g) , in large quantities. What other industrially important substances are produced in this process?

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified