Question 1

In the Hall process, ____________ is reduced ____________.

Accepted Answer

A)  nickel; electrolytically
B)  aluminum; electrolytically
C)  nickel; by reaction with metallic sodium
D)  aluminum; by reaction with metallic sodium
E)  copper; electrolyticallyF) B) and E)
G) D) and E)

Question 2

Why is cryolite, Na3AlF6, mixed with alumina prior to electrolysis in the production of Al?

Accepted Answer

It acts is...

Question 3

The alkali metals listed in order of increasing melting point is consistent with which of the following?

Accepted Answer

A)  Li 
B)  Cs 
C)  Be 
D)  Ba < Sr < Ca < Mg < BeE) All of the above
F) A) and B)

Question 4

Write a balanced chemical equation illustrating the thermite reaction.

Accepted Answer

2Al(s)+ Fe...

Question 5

Write a balanced chemical equation illustrating roasting.

Accepted Answer

2ZnS + 3O₂

2ZnO + 2S...

Question 6

Which of the following diagrams represents an insulator?

Accepted Answer

A)  A
B)  B
C)  CD) A) and B)
E) A) and C)

Question 7

Write a balanced chemical equation illustrating the decomposition of chile saltpeter to form sodium nitrite and oxygen gas.

Accepted Answer

2NaNO₃(s)

2N...

Question 8

Alloys of iron that contain 1.0-1.5% carbon and some manganese, phosphorus, silicon, and sulfur are called

Accepted Answer

A)  steel.
B)  cast iron.
C)  coke.
D)  pig iron.
E)  hematite.F) A) and B)
G) A) and C)

Question 9

Write the chemical formula of dolomite that provides a source for both magnesium and calcium.

Accepted Answer

The answer of Write the chemical formula of dolomite that...

Question 10

The following reaction is used to produce chromium metal at high temperature.
Cr2O3(s)+ 2Al(s)$\rarr$ 2Cr(l)+ Al2O3(s)
Which element is oxidized and which is reduced?

Accepted Answer

chromium is reduced ...

Question 11

Basic properties are characteristic of all alkaline earth metal oxides except one.The formula of this exception is

Accepted Answer

A)  BeO
B)  MgO
C)  SO2
D)  B2O3
E)  CaOF) A) and B)
G) C) and D)

Question 12

Aluminum hydroxide, Al(OH) 3, is

Accepted Answer

A)  an acid.
B)  an amphoteric hydroxide.
C)  a base.
D)  an explosive hydroxide.
E)  used to make amalgams.F) C) and E)
G) None of the above

Question 13

Barite, anglesite, and epsomite are all examples of what type of mineral?

Accepted Answer

A)  carbonates
B)  oxides
C)  sulfides
D)  sulfates
E)  silicatesF) B) and E)
G) A) and B)

Question 14

Write the chemical formula of magnetite.

Accepted Answer

Fe₃O₄ (accep...

Question 15

The mineral cryolite, Na3AlF6, is used in the Hall process for aluminum production as

Accepted Answer

A)  the source of aluminum (the ore) .
B)  a chemical reducing agent.
C)  a material that forms a slag and thus removes impurities.
D)  a solvent for alumina, Al2O3.E) C) and D)
F) A) and B)

Question 16

Aluminum is an active metal, but does not corrode as iron does because

Accepted Answer

A)  Al does not react with O2.
B)  a protective layer of Al2O3 forms on the metal surface.
C)  Al is harder to oxidize than is Fe.
D)  the enthalpy of formation of aluminum oxide is negative.
E)  aluminum has a high tensile strength.F) A) and E)
G) A) and D)

Question 17

What is the total number of moles (n) of electrons exchanged between the oxidizing agent and the reducing agent in the reaction below to obtain vanadium metal: V2O5(s) + 5Ca(l)  →\rarr→  2V(l) + 5CaO(s)

Accepted Answer

A)  1
B)  2
C)  5
D)  10
E)  0 F) A) and B)
G) A) and C)

Question 18

According to the band theory, a band is

Accepted Answer

A)  an elastic force that holds electrons close to atoms in an insulator.
B)  the energy gap associated with semiconductors.
C)  a large number of molecular orbitals that are close together in energy.
D)  a large number of atoms in a crystal.E) B) and C)
F) A) and D)

Question 19

Metallic sodium is obtained commercially from molten sodium chloride by

Accepted Answer

A)  chemical reduction with magnesium.
B)  flotation.
C)  electrolysis.
D)  zone refining.
E)  roasting.F) B) and D)
G) None of the above

Question 20

Argentite, chalcocite and cinnabar are all examples of what type of mineral?

Accepted Answer

A)  carbonates
B)  oxides
C)  halides
D)  phosphates
E)  sulfidesF) C) and D)
G) A) and B)

Exam 21: Metallurgy and the Chemistry of Metals

Write the chemical formula of dolomite that provides a source for both magnesium and calcium.

Correct AnswerverifiedShow Answer

Which of the following diagrams represents an insulator?

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Metallic sodium is obtained commercially from molten sodium chloride by

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Write a balanced chemical equation illustrating the thermite reaction.

Correct Answerverified2Al(s)+ Fe...View AnswerShow Answer

Barite, anglesite, and epsomite are all examples of what type of mineral?

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Write the chemical formula of magnetite.

Correct AnswerverifiedFe3O4 (accep...View AnswerShow Answer

Alloys of iron that contain 1.0-1.5% carbon and some manganese, phosphorus, silicon, and sulfur are called

Correct AnswerverifiedShow Answer

According to the band theory, a band is

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Aluminum is an active metal, but does not corrode as iron does because

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In the Hall process, ____________ is reduced ____________.

Correct AnswerverifiedShow Answer

Argentite, chalcocite and cinnabar are all examples of what type of mineral?

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Basic properties are characteristic of all alkaline earth metal oxides except one.The formula of this exception is

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The mineral cryolite, Na3AlF6, is used in the Hall process for aluminum production as

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What is the total number of moles (n) of electrons exchanged between the oxidizing agent and the reducing agent in the reaction below to obtain vanadium metal: V2O5(s) + 5Ca(l) →\rarr→ 2V(l) + 5CaO(s)

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Aluminum hydroxide, Al(OH) 3, is

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The following reaction is used to produce chromium metal at high temperature. Cr2O3(s)+ 2Al(s) →\rarr→ 2Cr(l)+ Al2O3(s) Which element is oxidized and which is reduced?

Correct Answerverifiedchromium is reduced ...View AnswerShow Answer

Write a balanced chemical equation illustrating the decomposition of chile saltpeter to form sodium nitrite and oxygen gas.

Correct Answerverified2NaNO3(s)2N...View AnswerShow Answer

The alkali metals listed in order of increasing melting point is consistent with which of the following?

Correct AnswerverifiedShow Answer

Write a balanced chemical equation illustrating roasting.

Correct Answerverified2ZnS + 3O2 2ZnO + 2S...View AnswerShow Answer

Why is cryolite, Na3AlF6, mixed with alumina prior to electrolysis in the production of Al?

Correct AnswerverifiedIt acts is...View AnswerShow Answer

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2Al(s)+ Fe...
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Fe₃O₄ (accep...
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In the Hall process, is reduced .

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The mineral cryolite, Na₃AlF₆, is used in the Hall process for aluminum production as

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What is the total number of moles (n) of electrons exchanged between the oxidizing agent and the reducing agent in the reaction below to obtain vanadium metal: V₂O₅(s) + 5Ca(l) $\rarr$ 2V(l) + 5CaO(s)

Correct Answer
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Aluminum hydroxide, Al(OH) ₃, is

Correct Answer
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The following reaction is used to produce chromium metal at high temperature. Cr₂O₃(s)+ 2Al(s) $\rarr$ 2Cr(l)+ Al₂O₃(s) Which element is oxidized and which is reduced?

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chromium is reduced ...
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2NaNO₃(s)2N...
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2ZnS + 3O₂ 2ZnO + 2S...
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Why is cryolite, Na₃AlF₆, mixed with alumina prior to electrolysis in the production of Al?

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It acts is...
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