Question 1

Which of the following it not true comparing aluminum to copper?

Accepted Answer

A)  Aluminum is cheaper than copper.
B)  Aluminum is lighter than copper.
C)  Aluminum is a better conductor of electricity than copper.
D)  Aluminum is easier to oxidize than copper.E) B) and C)
F) B) and D)

Question 2

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 B)

Question 3

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) B) and D) A

Question 4

The naturally occurring form of a metal that is concentrated enough to allow economical recovery of the metal is know as

Accepted Answer

A)  an element.
B)  a mineral.
C)  gangue.
D)  an ore.
E)  an amalgam.F) A) and B)
G) A) and D)

Question 5

Calcium metal is produced by electrolysis of

Accepted Answer

A)  CaSO4
B)  CaF2
C)  CaCO3
D)  Ca(OH) 2
E)  CaCl2F) A) and B)
G) All of the above

Question 6

Which one of these species is an example of a basic oxide?

Accepted Answer

A)  SO3(g) 
B)  BaO(s) 
C)  Al2O3(s) 
D)  Fe2O3(s) 
E)  SiO2(s) F) All of the above
G) C) and D)

Question 7

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 E)
G) All of the above

Question 8

Three means used to concentrate ores are flotation, ferromagnetic separation, and amalgamation.

Accepted Answer

A) True 
 B)False

Question 9

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 C)
G) B) and D) B

Question 10

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

Accepted Answer

CaCO<sub>3...

Question 11

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) B) and C)
F) A) and C)

Question 12

Write the chemical formula of pyrite.

Accepted Answer

The answer of Write the chemical formula of pyrite....

Question 13

Write the chemical formula of epsomite (sold in pharmacies as Epsom salts).

Accepted Answer

MgSO<sub>4...

Question 14

A naturally occurring substance with a range of chemical composition is

Accepted Answer

A)  an element.
B)  a mineral.
C)  gangue.
D)  an ore.
E)  an amalgam.F) A) and C)
G) A) and B) B

Question 15

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 D)
G) All of the above

Question 16

Which of these statements does not describe a property of aluminum?

Accepted Answer

A)  Al is an efficient electrical conductor.
B)  Al has a low density compared to other metals.
C)  Al forms an amphoteric hydroxide.
D)  Al is generally considered toxic to humans.
E)  Al has a great affinity for oxygen.F) A) and C)
G) A) and B)

Question 17

Write the chemical formula of calcite.

Accepted Answer

The answer of Write the chemical formula of calcite....

Question 18

Which element group includes the most reactive of all the metallic elements?

Accepted Answer

A)  alkali metals
B)  alkaline earth metals
C)  coinage metals (Group 1
B)  
D)  transition metals
E)  Group 2B metalsF) C) and D)
G) C) and E)

Question 19

All metals are solids at room temperature (25°C) except

Accepted Answer

A)  Cs.
B)  Cd.
C)  Ga.
D)  Hg.
E)  Rb.F) None of the above
G) A) and B)

Question 20

Write two balanced chemical equations for the burning of magnesium in air.

Accepted Answer

2Mg(s)+ O₂

Exam 20: Metallurgy and the Chemistry of Metals

Which of the following it not true comparing aluminum to copper?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedA

The naturally occurring form of a metal that is concentrated enough to allow economical recovery of the metal is know as

Correct AnswerverifiedShow Answer

Calcium metal is produced by electrolysis of

Correct AnswerverifiedShow Answer

Which one of these species is an example of a basic oxide?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Three means used to concentrate ores are flotation, ferromagnetic separation, and amalgamation.

Correct AnswerverifiedShow Answer

In the Hall process, ____________ is reduced ____________.

Correct AnswerverifiedB

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

Correct AnswerverifiedCaCO3...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

Write the chemical formula of pyrite.

Correct AnswerverifiedShow Answer

Write the chemical formula of epsomite (sold in pharmacies as Epsom salts).

Correct AnswerverifiedMgSO4...View AnswerShow Answer

A naturally occurring substance with a range of chemical composition is

Correct AnswerverifiedB

The flotation process used in metallurgy involves

Correct AnswerverifiedShow Answer

Which of these statements does not describe a property of aluminum?

Correct AnswerverifiedShow Answer

Write the chemical formula of calcite.

Correct AnswerverifiedShow Answer

Which element group includes the most reactive of all the metallic elements?

Correct AnswerverifiedShow Answer

All metals are solids at room temperature (25°C) except

Correct AnswerverifiedShow Answer

Write two balanced chemical equations for the burning of magnesium in air.

Correct Answerverified2Mg(s)+ O2View AnswerShow Answer

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A

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In the Hall process, is reduced .

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B

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CaCO_3...
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The mineral cryolite, Na₃AlF₆, is used in the Hall process for aluminum production as

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MgSO_4...
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B

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2Mg(s)+ O_{2View Answer}