Question 1

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. 
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.

Question 2

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

Accepted Answer

A) CaCO3 $\times$Mg(OH)2 
B) Ca(OH)2 $\times$MgCO3 
C) Ca(OH)2 $\times$ Mg(OH)2 
D) CaCO3 $\times$ MgCO3 
E)  None of the above 
A) CaCO3 $\times$Mg(OH)2 
B) Ca(OH)2 $\times$MgCO3 
C) Ca(OH)2 $\times$ Mg(OH)2 
D) CaCO3 $\times$ MgCO3 
E)  None of the above

Question 3

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 NH4Cl 
A)  NaHCO3 and NaCl 
B)  CaCO3 and Na2CO3 
C)  NaCl and NaCO3 
D)  NH3 and NaCl 
E)  Na2CO3 and NH4Cl

Question 4

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. 
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.

Question 5

Calcium metal is produced by electrolysis of

Accepted Answer

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

Question 6

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

Accepted Answer

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

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)  CaO. 
A)  BeO. 
B)  MgO. 
C)  SO2. 
D)  B2O3. 
E)  CaO.

Question 8

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

Question 9

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

Accepted Answer

A)  carbonates 
B)  oxides 
C)  halides 
D)  phosphates 
E)  sulfides 
A)  carbonates 
B)  oxides 
C)  halides 
D)  phosphates 
E)  sulfides

Question 10

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 
A)  1 
B)  2 
C)  3 
D)  6 
E)  21

Question 11

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

Accepted Answer

A) True 
 B)False

Question 12

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

Accepted Answer

A) True 
 B)False

Question 13

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. 
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.

Question 14

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 np3 
A)  ns1 
B)  ns2 
C)  ns2np1 
D)  ns2 np2 
E)  ns2 np3

Question 15

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

Accepted Answer

A) True 
 B)False

Question 16

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

Question 17

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 
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

Question 18

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. 
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.

Question 19

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. 
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.

Question 20

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. 
A)  chemical reduction with magnesium. 
B)  flotation. 
C)  electrolysis. 
D)  zone refining. 
E)  roasting.

Exam 21: Metallurgy and the Chemistry of Metals

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

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

What are the two raw materials used in the Solvay process

According to the band theory, a band is

Calcium metal is produced by electrolysis of

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

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

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

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

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)

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

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

In n-type semiconductors

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

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

Which two compounds are produced by the Solvay process

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

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

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

Metallic sodium is obtained commercially from molten sodium chloride by

Chemistry: The Study of Change

Atoms Molecules and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Gases

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Molecular Geometry and Hybridization of Atomic

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy Free Energy and Equilibrium

Electrochemistry

Nuclear Chemistry

Chemistry in the Atmosphere

Nonmetallic Elements and Their Compounds

Transition Metals Chemistry and Coordination Compounds

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

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

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

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)

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