Question 1

How much energy (kJ)  is released if 10.0g of Al(s)  is reacted with excess Fe2O3(s)  in the thermite reaction
2Al(s)  + Fe2O3(s)   →\rarr→ Al2O3(s)  + 2Fe(l)   Δ\DeltaΔ H ∘\circ∘  = - 822.8 kJ/mol

Accepted Answer

A)   8,230 kJ
B)   823 kJ
C)   305 kJ
D)   152 kJ
E)   4,110 kJ F) A) and B)
G) A) and C)

Question 2

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

Question 3

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

Accepted Answer

A)  2NaNO2(s)   →\rarr→  2NaNO3(s)  + O2(g) 
B)  NaNO3(s)   →\rarr→  NaNO2(s)  + O2(g) 
C)  2NaNO3(s)   →\rarr→ 2NaNO2(s)  + O2(g) 
D)  3NaNO2(s)   →\rarr→  3NaNO3(s)  + O2(g) 
E)   None of the above F) C) and D)
G) B) and D)

Question 4

The following depicts a correctly balanced chemical equation illustrating roasting.2ZnS + 3O2 $\rarr$ 2ZnO + 2SO2

Accepted Answer

A) True 
 B)False

Question 5

The valence electron configuration for the alkaline earth metals is represented by which of the following (n = outermost shell)

Accepted Answer

A)   ns1
B)   ns2
C)   ns2np1
D)   ns2 np2
E)   ns2 np3F) B) and E)
G) A) and D)

Question 6

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 E)
G) A) and C)

Question 7

Beryllium, the first element in Group 2A, is the most metallic element in the group.

Accepted Answer

A) True 
 B)False

Question 8

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) All of the above
F) C) and D)

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

Question 10

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)   CaO.F) A) and B)
G) A) and C)

Question 11

Which of the following is not a true comparison of 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 D)
F) B) and C)

Question 12

What are the 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) A) and C)
G) A) and D)

Question 13

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

Accepted Answer

A)   carbonates
B)   oxides
C)   halides
D)   phosphates
E)   sulfidesF) All of the above
G) A) and D)

Question 14

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) All of the above
F) A) and B)

Question 15

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 chromium metal
Cr2O3(s)  + 2Al(s)   →\rarr→  2Cr(l)  + Al2O3(s)

Accepted Answer

A)   1
B)   2
C)   3
D)   6
E)   21 F) B) and C)
G) B) and E)

Question 16

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

Accepted Answer

A) True 
 B)False

Question 17

Which two compounds are produced by the Solvay process

Accepted Answer

A)   CaCO3 and CaO
B)   CaCO3 and Na2CO3
C)   NaHCO3 and NaCl
D)   NH3 and NH4Cl
E)   NaHCO3 and Na2CO3F) B) and C)
G) A) and B)

Question 18

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

Accepted Answer

A)  CaCO3  ×	imes× Mg(OH) 2
B)  Ca(OH) 2  ×	imes× MgCO3
C)  Ca(OH) 2  ×	imes×  Mg(OH) 2
D)  CaCO3  ×	imes×  MgCO3
E)   None of the above F) None of the above
G) All of the above

Question 19

Calcium metal is produced by electrolysis of

Accepted Answer

A)   CaSO4.
B)   CaF2.
C)   CaCO3.
D)   Ca(OH) 2.
E)   CaCl2.F) A) and C)
G) A) and E)

Question 20

Which group of elements 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) A) and B)
G) B) and E)

Exam 21: Metallurgy and the Chemistry of Metals

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

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

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Beryllium, the first element in Group 2A, is the most metallic element in the group.

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What are the two raw materials used in the Solvay process

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

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How much energy (kJ) is released if 10.0g of Al(s) is reacted with excess Fe2O3(s) in the thermite reaction 2Al(s) + Fe2O3(s) →\rarr→ Al2O3(s) + 2Fe(l) Δ\DeltaΔ H ∘\circ∘ = - 822.8 kJ/mol

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The valence electron configuration for the alkaline earth metals is represented by which of the following (n = outermost shell)

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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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Which two compounds are produced by the Solvay process

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According to the band theory, a band is

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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 decomposition of chile saltpeter to form sodium nitrite and oxygen gas.

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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 chromium metal Cr2O3(s) + 2Al(s) →\rarr→ 2Cr(l) + Al2O3(s)

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The following depicts a correctly balanced chemical equation illustrating roasting.2ZnS + 3O2 →\rarr→ 2ZnO + 2SO2

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Which of the following is not a true comparison of aluminum to copper

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In n-type semiconductors

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

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

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Calcium metal is produced by electrolysis of

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

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How much energy (kJ) is released if 10.0g of Al(s) is reacted with excess Fe₂O₃(s) in the thermite reaction 2Al(s) + Fe₂O₃(s) $\rarr$ Al₂O₃(s) + 2Fe(l) $\Delta$ H^$\circ$ = - 822.8 kJ/mol

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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 chromium metal Cr₂O₃(s) + 2Al(s) $\rarr$ 2Cr(l) + Al₂O₃(s)

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The following depicts a correctly balanced chemical equation illustrating roasting.2ZnS + 3O₂ $\rarr$ 2ZnO + 2SO₂

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

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