Question 1

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 2

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

Accepted Answer

A) True 
 B)False

Question 3

Solids containing donor impurities are called ________ - _________ ________.

Accepted Answer

n-type sem...

Question 4

Write the chemical formula of halite.

Accepted Answer

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

Question 5

Electrolysis is used as the last step in isolating pure __________________.

Accepted Answer

A)  iron
B)  boron
C)  aluminum
D)  selenium
E)  carbonF) B) and E)
G) C) and D)

Question 6

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) D) and E)

Question 7

In gunpowder,which component is present in the highest percent by mass?

Accepted Answer

A)  Wood charcoal
B)  Chile salt peter
C)  Potassium nitrate
D)  Sulfur
E)  AmmoniaF) A) and C)
G) C) and D)

Question 8

Most metals come from _________________,which are naturally occurring substances with a range of chemical compositions.

Accepted Answer

The answer of Most metals come from _________________,which are naturally...

Question 9

In n-type semiconductors

Accepted Answer

A)  the energy gap between the valence band and the conduction band is very large.
B)  impurities that donate electrons are added to provide conduction electrons.
C)  a valence band overlaps the empty conduction band.
D)  impurities that provide "positive holes" are added to a pure semiconductor.E) A) and D)
F) B) and C)

Question 10

What is the chemical formula for phosphate rock?

Accepted Answer

A)  Na3PO4
B)  Na3P
C)  Mg3(PO4) 2
D)  AlPO4
E)  Ca3(PO4) 2F) B) and C)
G) A) and E)

Question 11

Solids containing acceptor impurities are called ________ - ________ _________.

Accepted Answer

p-type sem...

Question 12

What are two raw materials used in the Solvay process?

Accepted Answer

A)  NaHCO3 and NaCl
B)  CaCO3 and Na2CO3
C)  NaCl and NaCO3
D)  NH3 and NaCl
E)  Na2CO3 and NH4ClF) B) and E)
G) A) and E)

Question 13

Al(OH)3,Be(OH)2,and water are all amphoteric.

Accepted Answer

A) True 
 B)False

Question 14

Hydrometallurgy 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) B) and D)
G) A) and D)

Question 15

Alkali metals are the most electronegative metals in the periodic table.

Accepted Answer

A) True 
 B)False

Question 16

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)  electrolysis.F) All of the above
G) A) and B)

Question 17

What is the major component in milk of magnesia?

Accepted Answer

A)  Mg(OH) 2
B)  MgS
C)  MgCl
D)  MgSO4
E)  MgCO3F) B) and D)
G) None of the above

Question 18

What is the name of the relationship that exists because of the similar properties of carbon to phosphorus and nitrogen to sulfur?

Accepted Answer

A)  A diagonal relationship
B)  The periodic law
C)  Amphoterism
D)  An isoelectronic relationship
E)  An allotropic relationshipF) A) and B)
G) A) and E)

Question 19

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) A) and E)

Question 20

What is the chemical formula for limestone?

Accepted Answer

A)  LiOH
B)  Li2CO3
C)  CaCO3
D)  BaCO3
E)  Ca3(PO4) 2F) C) and E)
G) A) and D)

Exam 23: Metallurgy and the Chemistry of Metals

What are two raw materials used in the Solvay process?

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Alkali metals are the most electronegative metals in the periodic table.

Correct AnswerverifiedShow Answer

Electrolysis is used as the last step in isolating pure __________________.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the name of the relationship that exists because of the similar properties of carbon to phosphorus and nitrogen to sulfur?

Correct AnswerverifiedShow Answer

Solids containing acceptor impurities are called ________ - ________ _________.

Correct Answerverifiedp-type sem...View AnswerShow Answer

The flotation process used in metallurgy involves

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In the Hall process,____________ is reduced ____________.

Correct AnswerverifiedShow Answer

Hydrometallurgy uses __________________ to separate a metal from its ore.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

In gunpowder,which component is present in the highest percent by mass?

Correct AnswerverifiedShow Answer

Write the chemical formula of halite.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

What is the major component in milk of magnesia?

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Solids containing donor impurities are called ________ - _________ ________.

Correct Answerverifiedn-type sem...View AnswerShow Answer

In n-type semiconductors

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Most metals come from _________________,which are naturally occurring substances with a range of chemical compositions.

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What is the chemical formula for phosphate rock?

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Al(OH)3,Be(OH)2,and water are all amphoteric.

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What is the chemical formula for limestone?

Correct AnswerverifiedShow Answer

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Solids containing acceptor impurities are called - _.

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p-type sem...
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In the Hall process, is reduced .

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

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Solids containing donor impurities are called ____ - _ ____.

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n-type sem...
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Al(OH)₃,Be(OH)₂,and water are all amphoteric.

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