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) C) and D)
G) None of the above

Question 2

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) C) and D)
G) None of the above

Question 3

In the commercial production of aluminum metal, the final stage involves the reaction
2Al2O3(in molten Na3AlF6) + 3C(graphite) $\rightarrow$ 4Al(l) + 3CO2(g)
Briefly outline the method and equipment with which the reaction is accomplished.

Accepted Answer

This is done electrolytically,...

Question 4

The process of converting metal sulfides to metal oxides is called

Accepted Answer

A)   roasting.
B)   smelting.
C)   reduction.
D)   leaching.
E)   oxidation.F) A) and E)
G) C) and D)

Question 5

When nitrogen undergoes atmospheric fixation, it enters the sea and land in the form of:

Accepted Answer

A)   NO
B)   NO2
C)   NH3
D)   NO3¯
E)   NH4+F) A) and B)
G) C) and D)

Question 6

Sulfide ores are frequently treated by flotation in order to concentrate them.

Accepted Answer

A) True 
 B)False

Question 7

The Frasch process is used to

Accepted Answer

A)   convert aluminum oxide to metallic aluminum.
B)   convert copper ore to copper sulfide.
C)   mine magnesium.
D)   mine elemental sulfur.
E)   produce sodium metal.F) All of the above
G) B) and E)

Question 8

Carbon atoms in the carbon cycle spend most of their time in the oceans.

Accepted Answer

A) True 
 B)False

Question 9

Describe, and give reasons for, the fundamental bonding differences between transition metal sulfides and transition metal oxides.

Accepted Answer

Transition metal oxides are ionic in nat...

Question 10

Cryolite, Na3AlF6, is used in the electrolysis of aluminum oxide because

Accepted Answer

A)   it is a good source of fluoride ions.
B)   it reduces the energy requirement of the process, due to its low melting point.
C)   it provides a source of fluorine, an oxidizing agent.
D)   it provides a source of sodium, a reducing agent.
E)   it is very soluble in water.F) A) and E)
G) B) and E)

Question 11

The debris accompanying a mineral is called

Accepted Answer

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

Question 12

The main end use of sulfuric acid is

Accepted Answer

A)   manufacture of iron and steel
B)   processing of petroleum
C)   production of fertilizers
D)   production of explosives
E)   production of various other chemicalsF) A) and B)
G) B) and D)

Question 13

Transition elements from the right side of the periodic table are generally found as

Accepted Answer

A)   sulfides because they tend to give up bonding electrons and form crystals with high lattice energies with sulfur.
B)   sulfides because their electronegativities favor formation of covalent bonds with the polarizable sulfide anion.
C)   oxides because they tend to give up bonding electrons and form crystals with high lattice energies with oxygen.
D)   oxides because oxygen, with its high electronegativity, forms strong covalent bonds with them.
E)   None of these choices is correct.F) All of the above
G) A) and B)

Question 14

The industrial production of ammonia from nitrogen and hydrogen accounts for a greater amount of nitrogen fixation than either the atmospheric or the biological pathways.

Accepted Answer

A) True 
 B)False

Question 15

The Downs cell is used in the production of

Accepted Answer

A)   copper.
B)   hydrogen.
C)   iron.
D)   magnesium.
E)   sodium.F) C) and E)
G) A) and E)

Question 16

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

Accepted Answer

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

Question 17

Alloying a metal is done to

Accepted Answer

A)   make its extraction from its ore easier.
B)   convert the metal to an oxide.
C)   disguise the true identity of the metal.
D)   prepare ultrapure metal samples.
E)   enhance properties like conductivity.F) B) and C)
G) A) and B)

Question 18

Give two important reasons why there is so much more Na+ in the oceans than K+, despite their similar abundances in the earth's crust.

Accepted Answer

Clays bind K⁺ more effectively ...

Question 19

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

Accepted Answer

A) True 
 B)False

Question 20

The Hall-Héroult process refers to

Accepted Answer

A)   the production of aluminum by electrolysis.
B)   the recovery of sulfur from underground deposits.
C)   the manufacture of sulfuric acid.
D)   the production of ammonia from nitrogen and hydrogen gases.
E)   the isolation of Al2O3 from bauxite.F) A) and E)
G) C) and E)

Exam 22: The Elements in Nature and Industry

Alloying a metal is done to

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Cryolite, Na3AlF6, is used in the electrolysis of aluminum oxide because

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

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The debris accompanying a mineral is called

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The Frasch process is used to

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Sulfide ores are frequently treated by flotation in order to concentrate them.

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Describe, and give reasons for, the fundamental bonding differences between transition metal sulfides and transition metal oxides.

Correct AnswerverifiedTransition metal oxides are ionic in nat...View AnswerShow Answer

The main end use of sulfuric acid is

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

Correct AnswerverifiedShow Answer

The industrial production of ammonia from nitrogen and hydrogen accounts for a greater amount of nitrogen fixation than either the atmospheric or the biological pathways.

Correct AnswerverifiedShow Answer

Carbon atoms in the carbon cycle spend most of their time in the oceans.

Correct AnswerverifiedShow Answer

When nitrogen undergoes atmospheric fixation, it enters the sea and land in the form of:

Correct AnswerverifiedShow Answer

The Downs cell is used in the production of

Correct AnswerverifiedShow Answer

The Hall-Héroult process refers to

Correct AnswerverifiedShow Answer

Electrometallurgy uses _________________ to separate a metal from its ore.

Correct AnswerverifiedShow Answer

Transition elements from the right side of the periodic table are generally found as

Correct AnswerverifiedShow Answer

Give two important reasons why there is so much more Na+ in the oceans than K+, despite their similar abundances in the earth's crust.

Correct AnswerverifiedClays bind K+ more effectively ...View AnswerShow 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 process of converting metal sulfides to metal oxides is called

Correct AnswerverifiedShow Answer

In the commercial production of aluminum metal, the final stage involves the reaction 2Al2O3(in molten Na3AlF6) + 3C(graphite) →\rightarrow→ 4Al(l) + 3CO2(g) Briefly outline the method and equipment with which the reaction is accomplished.

Correct AnswerverifiedThis is done electrolytically,...View AnswerShow Answer

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Cryolite, Na₃AlF₆, is used in the electrolysis of aluminum oxide because

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Transition metal oxides are ionic in nat...
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Give two important reasons why there is so much more Na⁺ in the oceans than K⁺, despite their similar abundances in the earth's crust.

Correct Answer
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Clays bind K⁺ more effectively ...
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The chlor-alkali process produces chlorine, Cl₂(g) , in large quantities. What other industrially important substances are produced in this process?

Correct Answer
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Correct Answer
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In the commercial production of aluminum metal, the final stage involves the reaction 2Al₂O₃(in molten Na₃AlF₆) + 3C(graphite) $\rightarrow$ 4Al(l) + 3CO₂(g) Briefly outline the method and equipment with which the reaction is accomplished.

Correct Answer
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This is done electrolytically,...
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