Question 1

The Hall process involves the reduction of Al2O3 to aluminum by

Accepted Answer

A)   carbon (coke) .
B)   carbon monoxide.
C)   molecular hydrogen.
D)   sodium.
E)   electrolysis.F) A) and E)
G) A) and D)

Question 2

Cast iron as it is prepared in a blast furnace is a product of high purity.

Accepted Answer

A) True 
 B)False

Question 3

The chemical formula of magnetite can be expressed as either
Fe3O4 or FeO $\times$ Fe2O3

Accepted Answer

A) True 
 B)False

Question 4

The following two reactions represent the chemical reactions that can take place when magnesium is burned in air.2Mg(s) + O2(g) $\rarr$ 2MgO(s) and 3Mg(s) + N2(g) $\rarr$Mg3N2(s)

Accepted Answer

A) True 
 B)False

Question 5

Which of the following diagrams represents an insulator

Accepted Answer

A)   A
B)   B
C)   CD) A) and B)
E) All of the above

Question 6

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) C) and E)
G) B) and E)

Question 7

Write the chemical formula of pyrite.

Accepted Answer

A)   FeS
B)   Fe2S3
C)   FeS2
D)   Fe3S2
E)   None of the aboveF) A) and B)
G) C) and D)

Question 8

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

Question 9

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) B) and C)

Question 10

For the reaction 3Fe(s)  + C(s)   →\rarr→ Fe3C(s) ,  Δ\DeltaΔ H ∘\circ∘  = 21 kJ/mol and  Δ\DeltaΔ S ∘\circ∘  = 20.4 J/mol·K at 25 ∘\circ∘ C. Estimate the minimum temperature above which the formation of cementite (Fe3C)  is favored.

Accepted Answer

A)   1.0 ∘\circ∘ C
B)   970 ∘\circ∘ C
C)   700 ∘\circ∘ C
D)   1000 ∘\circ∘ C
E)   760 ∘\circ∘ C F) A) and B)
G) B) and E)

Question 11

Potassium superoxide, KO2(s), is used in the breathing systems of biohazard suits. The following separate chemical equations show how KO2(s) reacts with moisture and carbon dioxide in exhaled air to generate oxygen gas.
2KO2(s) + 2H2O(l) $\rarr$ 2KOH(aq) + O2(g) + H2O2(aq)
4KO2(s) + 2CO2(g) $\rarr$2K2CO3(s) + 3O2(g)

Accepted Answer

A) True 
 B)False

Question 12

The flotation process used in metallurgy involves

Accepted Answer

A)   the roasting of sulfides.
B)   separation of gangue from ore.
C)   electrolytic reduction.
D)   chemical reduction of a metal.
E)   zone refining.F) B) and C)
G) A) and B)

Question 13

Which of these ions is most likely to substitute for Ca2+ in the human body

Accepted Answer

A)   Cl-
B)   Sr2+
C)   K+
D)   S2-
E)   Pb2+F) A) and B)
G) A) and E) B

Question 14

The following equation correctly represents the balanced chemical equation illustrating the thermite reaction.2Al(s) + Fe2O3(s) $\rarr$Al2O3(s) + 2Fe(l)

Accepted Answer

A) True 
 B)False  True

Question 15

Write the chemical formula of corundum.

Accepted Answer

A)   Al3O2
B)   Al2O3
C)   AlO3
D)   Al3O
E)   None of the aboveF) C) and D)
G) A) and E)

Question 16

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 D)
G) A) and E)

Question 17

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

A)   Both chromium and aluminum are oxidized
B)   Chromium is oxidized and aluminum is reduced
C)   Chromium is reduced and aluminum is oxidized
D)   Neither chromium or aluminum are oxidized
E)   None of the above F) C) and D)
G) A) and B)

Question 18

Which one of these metals would normally be obtained by electrolytic reduction

Accepted Answer

A)   aluminum
B)   chromium
C)   copper
D)   iron
E)   zincF) None of the above
G) C) and E)

Question 19

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 B)
G) C) and D) B

Question 20

In the production of potassium metal, the source of electrons in the reduction of K+ ions is

Accepted Answer

A)   H2(g) 
B)   Na(g) 
C)   CO(g) 
D)   CaO(s) 
E)   electrolysisF) A) and E)
G) A) and B)

Exam 21: Metallurgy and the Chemistry of Metals

The Hall process involves the reduction of Al₂O₃ to aluminum by

Correct Answer
verified

Cast iron as it is prepared in a blast furnace is a product of high purity.

Correct Answer
verified

The chemical formula of magnetite can be expressed as either Fe₃O₄ or FeO $\times$ Fe₂O₃

Correct Answer
verified

The following two reactions represent the chemical reactions that can take place when magnesium is burned in air.2Mg(s) + O₂(g) $\rarr$ 2MgO(s) and 3Mg(s) + N₂(g) $\rarr$ Mg₃N₂(s)

Correct Answer
verified

Which of the following diagrams represents an insulator

Correct Answer
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In the Hall process, is reduced .

Correct Answer
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Write the chemical formula of pyrite.

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

Correct Answer
verified

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

Correct Answer
verified

For the reaction 3Fe(s) + C(s) $\rarr$ Fe₃C(s) , $\Delta$ H^$\circ$ = 21 kJ/mol and $\Delta$ S^$\circ$ = 20.4 J/mol·K at 25^$\circ$C. Estimate the minimum temperature above which the formation of cementite (Fe₃C) is favored.

Correct Answer
verified

Correct Answer
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The flotation process used in metallurgy involves

Correct Answer
verified

Which of these ions is most likely to substitute for Ca²⁺ in the human body

Correct Answer
verified
B

The following equation correctly represents the balanced chemical equation illustrating the thermite reaction.2Al(s) + Fe₂O₃(s) $\rarr$ Al₂O₃(s) + 2Fe(l)

Correct Answer
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True

Write the chemical formula of corundum.

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

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

Correct Answer
verified

Which one of these metals would normally be obtained by electrolytic reduction

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

Correct Answer
verified
B

In the production of potassium metal, the source of electrons in the reduction of K⁺ ions is

Correct Answer
verified

Exam 21: Metallurgy and the Chemistry of Metals

The Hall process involves the reduction of Al2O3 to aluminum by

Correct AnswerverifiedShow Answer

Cast iron as it is prepared in a blast furnace is a product of high purity.

Correct AnswerverifiedShow Answer

The chemical formula of magnetite can be expressed as either Fe3O4 or FeO ×\times× Fe2O3

Correct AnswerverifiedShow Answer

The following two reactions represent the chemical reactions that can take place when magnesium is burned in air.2Mg(s) + O2(g) →\rarr→ 2MgO(s) and 3Mg(s) + N2(g) →\rarr→ Mg3N2(s)

Correct AnswerverifiedShow Answer

Which of the following diagrams represents an insulator

Correct AnswerverifiedShow Answer

In the Hall process, ____________ is reduced ____________.

Correct AnswerverifiedShow Answer

Write the chemical formula of pyrite.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

For the reaction 3Fe(s) + C(s) →\rarr→ Fe3C(s) , Δ\DeltaΔ H ∘\circ∘ = 21 kJ/mol and Δ\DeltaΔ S ∘\circ∘ = 20.4 J/mol·K at 25 ∘\circ∘ C. Estimate the minimum temperature above which the formation of cementite (Fe3C) is favored.

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

The flotation process used in metallurgy involves

Correct AnswerverifiedShow Answer

Which of these ions is most likely to substitute for Ca2+ in the human body

Correct AnswerverifiedB

The following equation correctly represents the balanced chemical equation illustrating the thermite reaction.2Al(s) + Fe2O3(s) →\rarr→ Al2O3(s) + 2Fe(l)

Correct AnswerverifiedTrue

Write the chemical formula of corundum.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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 AnswerverifiedShow Answer

Which one of these metals would normally be obtained by electrolytic reduction

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedB

In the production of potassium metal, the source of electrons in the reduction of K+ ions is

Correct AnswerverifiedShow Answer

The Hall process involves the reduction of Al₂O₃ to aluminum by

Correct Answer
verified

Correct Answer
verified

The chemical formula of magnetite can be expressed as either Fe₃O₄ or FeO $\times$ Fe₂O₃

Correct Answer
verified

The following two reactions represent the chemical reactions that can take place when magnesium is burned in air.2Mg(s) + O₂(g) $\rarr$ 2MgO(s) and 3Mg(s) + N₂(g) $\rarr$ Mg₃N₂(s)

Correct Answer
verified

Correct Answer
verified

In the Hall process, is reduced .

Correct Answer
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Correct Answer
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Correct Answer
verified

Correct Answer
verified

For the reaction 3Fe(s) + C(s) $\rarr$ Fe₃C(s) , $\Delta$ H^$\circ$ = 21 kJ/mol and $\Delta$ S^$\circ$ = 20.4 J/mol·K at 25^$\circ$C. Estimate the minimum temperature above which the formation of cementite (Fe₃C) is favored.

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Which of these ions is most likely to substitute for Ca²⁺ in the human body

Correct Answer
verified
B

The following equation correctly represents the balanced chemical equation illustrating the thermite reaction.2Al(s) + Fe₂O₃(s) $\rarr$ Al₂O₃(s) + 2Fe(l)

Correct Answer
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True

Correct Answer
verified

Correct Answer
verified

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 Answer
verified

Correct Answer
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Correct Answer
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B

In the production of potassium metal, the source of electrons in the reduction of K⁺ ions is

Correct Answer
verified