Question 1

The respective standard oxidation potentials for Cu -Cu2+, Ni -Ni2+, and Ag -Ag+ are (in V) 
- 0) 34, +0.28, and - 0.80. Impure copper slabs at the anode are refined electrochemically, affording much purer metallic copper at the cathode. Which statement below is true?

Accepted Answer

A)   Ni is oxidized preferentially over Cu, and Ni2+ is reduced much less readily than Cu2+, so Ni is separated as Ni2+ in the electrolyte solution.
B)   Cu is oxidized preferentially over both Ni and Ag, so both Ni and Ag metals are separated as sludges below the anode.
C)   Ag is oxidized preferentially over Cu, and Ag+ is reduced much less readily than Cu2+, so Ag is separated as Ag+ in the electrolyte solution.
D)   Ag is oxidized preferentially over Cu, and Ag+ is reduced much more readily than Cu2+, so Ag plates out with Cu at the cathode and cannot readily be removed from impure copper.
E)   Both Ni and Ag are oxidized preferentially over Cu and Ni2+, and Ag+ is reduced much less readily than Cu2+, so Ni and Ag are separated as Ni2+ and Ag+ in the electrolyte solution.F) B) and C)
G) A) and D)

Question 2

Roasting ZnS in the presence of oxygen produces the metal oxide and SO2. What is the coefficient of ZnS when the equation for this reaction is completed and balanced?

Accepted Answer

A)   4
B)   2
C)   3
D)   5
E)   1F) D) and E)
G) A) and E)

Question 3

Steel is

Accepted Answer

A)   pure iron.
B)   a liquid at room temperature.
C)   oxidized iron.
D)   an alloy of iron.
E)   a mixture of iron and silver.F) C) and E)
G) A) and D)

Question 4

Most transition metal ions contain partially occupied subshells.

Accepted Answer

The answer of Most transition metal ions contain partially occupied...

Question 5

Carbon monoxide is commonly used to produce free metals from their oxides. What is the coefficient of carbon monoxide in the balanced equation for the production of cobalt from Co2O3?

Accepted Answer

A)   2
B)   5
C)   3
D)   4
E)   1F) C) and D)
G) B) and C)

Question 6

Metallurgical processes that utilize high temperatures are collectively called

Accepted Answer

A)   alloying.
B)   pyrometallurgy.
C)   roasting.
D)   electrometallurgy.
E)   hydrometallurgy.F) D) and E)
G) C) and D)

Question 7

The hydrated nickel(II)  ion is

Accepted Answer

A)   green.
B)   yellow.
C)   orange.
D)   colorless.
E)   blue.F) B) and C)
G) B) and D)

Question 8

What are the products of the following (unbalanced)  leaching process? 4- (aq)  and OH- (aq)  B)  Au(CN) 2- (aq)  and OH- (aq)  C)  AuCN (s)  and OH- (aq)  D)  AuCN (s)  and H2O2 (aq)  E)  Au(CN) 3 (s)  and OH- (aq) " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)   Au(CN) 4- (aq)  and OH- (aq) 
B)   Au(CN) 2- (aq)  and OH- (aq) 
C)   AuCN (s)  and OH- (aq) 
D)   AuCN (s)  and H2O2 (aq) 
E)   Au(CN) 3 (s)  and OH- (aq) F) None of the above
G) A) and D)

Question 9

Anhydrous aluminum oxide is dissolved in molten cryolite rather than simply melted because
__________

Accepted Answer

A)   the cryolite provides a source of sodium ions.
B)   the melting point of pure, anhydrous aluminum oxide is too high.
C)   the cryolite provides the necessary fluoride ions.
D)   the cryolite actually provides the aluminum that is to be reduced.
E)   in pure, molten Al2O3, the aluminum would be oxidized rather than reduced.F) D) and E)
G) C) and D)

Question 10

Most of the metals in the third transition series have about the same atomic radius as the elements above them in second transition series. This is a result of .

Accepted Answer

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Question 11

What is the typical effect of the addition of an interstitial element on the properties of a metal?

Accepted Answer

A)   increased surface luster
B)   increase in malleability and corrosion resistance
C)   decrease in conductivity and increase in brittleness
D)   decrease in melting point and increase in ductility
E)   increase in hardness and strength, decrease in ductilityF) B) and D)
G) None of the above

Question 12

An advantage to leaching gold with aqueous solutions of cyanide ion is that

Accepted Answer

A)   the gold recovered in this way has higher purity than gold recovered in other ways.
B)   the process requires only one step.
C)   the method can be used to locate underground gold deposits.
D)   gold can be recovered from very low- grade ores by this method.
E)   the process is environmentally safe.F) B) and E)
G) A) and D)

Question 13

Which one of the following compounds is yellow?

Accepted Answer

A)   CCl2
B)   K2CrO4
C)   (NH4) 2Cr2O7
D)   Cr(NO3) 3
E)   CrCl3F) A) and B)
G) A) and C)

Question 14

Draw a diagram of the short- hand ground state electron configuration of zinc.

Accepted Answer

The answer of Draw a diagram of the short- hand...

Question 15

Hydrometallurgy is

Accepted Answer

A)   the use of aqueous solutions to extract metals from their ores.
B)   the use of water to cool molten metals.
C)   the use of high temperature processes to concentrate and refine metals.
D)   the use of high temperature processes to make alloys.
E)   the use of water to locate underground ore deposits.F) A) and E)
G) C) and E)

Question 16

If the electronic structure of a solid substance consists of a valence band that is completely filled with electrons and there is a large energy gap to the next set of orbitals, then this substance will be a(n)  _ .

Accepted Answer

A)   semiconductor
B)   conductor
C)   alloy
D)   nonmetal
E)   insulatorF) C) and E)
G) A) and C)

Question 17

The first step in the production of nickel from its ore, NiS, is to roast it in the presence of oxygen to form the metal oxide and SO2. What is the coefficient of oxygen when the equation for this reaction is completed and balanced?

Accepted Answer

A)   2
B)   1
C)   5
D)   3
E)   4F) A) and E)
G) A) and D)

Question 18

What happens to the silicon that is a contaminant in crude iron in a converter?

Accepted Answer

A)   it is converted to the tetrafluoride that bubbles out as a gas.
B)   It is precipitated as the carbide.
C)   It is precipitated as sodium silicate.
D)   It is precipitated as iron silicate.
E)   It is converted to silicon dioxide and becomes part of the slag.F) All of the above
G) B) and C)

Question 19

The molecular- orbital model for Ge shows it to be

Accepted Answer

A)   an insulator, because all the lower energy band orbitals are filled and the gap between the lower and higher bands is large.
B)   a conductor, because its lower energy band orbitals are only partially filled.
C)   a conductor, because all the lower energy band orbitals are filled and the gap between the lower and higher bands is large.
D)   a semiconductor, because the gap between the filled lower and empty higher energy bands is relatively small.
E)   a semiconductor, because the gap between the filled lower and empty higher energy bands is large.F) A) and B)
G) A) and C)

Question 20

The oxidation state of copper in Cu2S is .

Accepted Answer

A)   +1
B)   0
C)   +6
D)   +2
E)   +4F) B) and C)
G) B) and D)

Exam 23: Metals and Metallurgy

What happens to the silicon that is a contaminant in crude iron in a converter?

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Carbon monoxide is commonly used to produce free metals from their oxides. What is the coefficient of carbon monoxide in the balanced equation for the production of cobalt from Co2O3?

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Roasting ZnS in the presence of oxygen produces the metal oxide and SO2. What is the coefficient of ZnS when the equation for this reaction is completed and balanced?

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What is the typical effect of the addition of an interstitial element on the properties of a metal?

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Hydrometallurgy is

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The respective standard oxidation potentials for Cu -Cu2+, Ni -Ni2+, and Ag -Ag+ are (in V) - 0) 34, +0.28, and - 0.80. Impure copper slabs at the anode are refined electrochemically, affording much purer metallic copper at the cathode. Which statement below is true?

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The molecular- orbital model for Ge shows it to be

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Draw a diagram of the short- hand ground state electron configuration of zinc.

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The hydrated nickel(II) ion is

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The first step in the production of nickel from its ore, NiS, is to roast it in the presence of oxygen to form the metal oxide and SO2. What is the coefficient of oxygen when the equation for this reaction is completed and balanced?

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Steel is

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If the electronic structure of a solid substance consists of a valence band that is completely filled with electrons and there is a large energy gap to the next set of orbitals, then this substance will be a(n) _ .

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An advantage to leaching gold with aqueous solutions of cyanide ion is that

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Most transition metal ions contain partially occupied subshells.

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What are the products of the following (unbalanced) leaching process?

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Metallurgical processes that utilize high temperatures are collectively called

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Anhydrous aluminum oxide is dissolved in molten cryolite rather than simply melted because __________

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Which one of the following compounds is yellow?

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The oxidation state of copper in Cu2S is .

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Most of the metals in the third transition series have about the same atomic radius as the elements above them in second transition series. This is a result of .

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Carbon monoxide is commonly used to produce free metals from their oxides. What is the coefficient of carbon monoxide in the balanced equation for the production of cobalt from Co₂O₃?

Correct Answer
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Roasting ZnS in the presence of oxygen produces the metal oxide and SO₂. What is the coefficient of ZnS when the equation for this reaction is completed and balanced?

Correct Answer
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The respective standard oxidation potentials for Cu -Cu²⁺, Ni -Ni²⁺, and Ag -Ag⁺are (in V) - 0) 34, +0.28, and - 0.80. Impure copper slabs at the anode are refined electrochemically, affording much purer metallic copper at the cathode. Which statement below is true?

Correct Answer
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The first step in the production of nickel from its ore, NiS, is to roast it in the presence of oxygen to form the metal oxide and SO₂. What is the coefficient of oxygen when the equation for this reaction is completed and balanced?

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The oxidation state of copper in Cu₂S is .

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