Question 1

An interstitial alloy contains carbon in one-fourth of the octahedral holes of a closest-packed metal,M.What is the formula of this alloy?

Accepted Answer

A) M4C 
B) MC4 
C) MC 
D) M2C 
E) MC2 
A) M4C 
B) MC4 
C) MC 
D) M2C 
E) MC2 A

Question 2

Roasting is

Accepted Answer

A) forming metal parts using heat and small crystals of metal. 
B) the process of heating an ore to drive off volatile compounds. 
C) selectively dissolving a metal in solution to separate it from its ore. 
D) heating an ore in the presence of oxygen or another substance to purify the ore and obtain the liquid metal. 
E) heating an ore in the presence of oxygen or another substance to cause a chemical reaction that drives off newly formed volatile compounds. 
A) forming metal parts using heat and small crystals of metal. 
B) the process of heating an ore to drive off volatile compounds. 
C) selectively dissolving a metal in solution to separate it from its ore. 
D) heating an ore in the presence of oxygen or another substance to purify the ore and obtain the liquid metal. 
E) heating an ore in the presence of oxygen or another substance to cause a chemical reaction that drives off newly formed volatile compounds. E

Question 3

Which of the following is TRUE concerning point "D" on the figure?

Accepted Answer

A) The alloy is composed of the BCC structure. 
B) The alloy is composed of the FCC structure. 
C) The alloy is composed of both FCC and BCC phases,with a larger portion of FCC present. 
D) The alloy is composed of both FCC and BCC phases,with a larger portion of BCC present. 
E) The alloy is composed of both FCC and BCC phases,with equal portions of each phase. 
A) The alloy is composed of the BCC structure. 
B) The alloy is composed of the FCC structure. 
C) The alloy is composed of both FCC and BCC phases,with a larger portion of FCC present. 
D) The alloy is composed of both FCC and BCC phases,with a larger portion of BCC present. 
E) The alloy is composed of both FCC and BCC phases,with equal portions of each phase. C

Question 4

Powder metallurgy is

Accepted Answer

A) refining of metal ores using oxidation-reduction reactions. 
B) refining of metal ores using heat. 
C) forming metal parts using electricity. 
D) refining of metal ores using reactions with aqueous solutions. 
E) forming metal parts using heat and small crystals of metal. 
A) refining of metal ores using oxidation-reduction reactions. 
B) refining of metal ores using heat. 
C) forming metal parts using electricity. 
D) refining of metal ores using reactions with aqueous solutions. 
E) forming metal parts using heat and small crystals of metal.

Question 5

Identify the normal crystal structure at room temperature for Ni.

Accepted Answer

A) face-centred cubic 
B) body-centred cubic 
C) tetrahedral 
D) hexagonal 
E) hexagonal closest packed 
A) face-centred cubic 
B) body-centred cubic 
C) tetrahedral 
D) hexagonal 
E) hexagonal closest packed

Question 6

Describe the difference between a substitutional alloy and an interstitial alloy.

Accepted Answer

A substitutional alloy just "swaps" one

Question 7

What method is used to obtain pure aluminum metal from Al2O3?

Accepted Answer

A) smelting 
B) powder metallurgy 
C) Hall process 
D) leaching 
E) calcination 
A) smelting 
B) powder metallurgy 
C) Hall process 
D) leaching 
E) calcination

Question 8

Why is zinc used to coat steel objects?

Accepted Answer

Zinc is a stronger reducing ag

Question 9

Pyrometallurgy is the

Accepted Answer

A) refining of metal ores using reactions with aqueous solutions. 
B) refining of metal ores using heat. 
C) refining of metal ores using oxidation-reduction reactions. 
D) forming of metal parts using heat and small crystals of metal. 
E) forming of metal parts using electricity. 
A) refining of metal ores using reactions with aqueous solutions. 
B) refining of metal ores using heat. 
C) refining of metal ores using oxidation-reduction reactions. 
D) forming of metal parts using heat and small crystals of metal. 
E) forming of metal parts using electricity.

Question 10

Which of the following is a general property of a metal?

Accepted Answer

A) high resistivity 
B) good conductor of heat 
C) low boiling point 
D) low melting point 
E) high electronegativity 
A) high resistivity 
B) good conductor of heat 
C) low boiling point 
D) low melting point 
E) high electronegativity

Question 11

Which of the following is TRUE concerning point "B" on the figure?

Accepted Answer

A) The alloy is composed of the BCC structure. 
B) The alloy is composed of the FCC structure. 
C) The alloy is composed of both FCC and BCC phases,with a larger portion of BCC present. 
D) The alloy is composed of both FCC and BCC phases,with a larger portion of FCC present. 
E) The alloy is composed of both FCC and BCC phases,with equal portions of each phase. 
A) The alloy is composed of the BCC structure. 
B) The alloy is composed of the FCC structure. 
C) The alloy is composed of both FCC and BCC phases,with a larger portion of BCC present. 
D) The alloy is composed of both FCC and BCC phases,with a larger portion of FCC present. 
E) The alloy is composed of both FCC and BCC phases,with equal portions of each phase.

Question 12

What are the components of bronze?

Accepted Answer

A) copper and tin 
B) lead and aluminum 
C) nickel and zinc 
D) copper and zinc 
E) zinc and lead 
A) copper and tin 
B) lead and aluminum 
C) nickel and zinc 
D) copper and zinc 
E) zinc and lead

Question 13

Identify a balanced equation for the calcination of Al(OH)3.

Accepted Answer

A) 2Al(OH)3(s)   Al2O3(s)+ 3H2O(g) 
B) Al(OH)3(s)+ SiO2(s)   AlSiO3(s)+ 3H2O(g) 
C) 2Al(OH)3(s)+ O2(g)   Al2O3(s)+ 3H2O(g) 
D) Al(OH)3(s)+ C(s)   Al2O3(s)+ CO2(g)+ H2O(g) 
E) 2Al(OH)3(s)+ 3CO(g)   Al2O3(s)+ 3CO2(g)+ 3H2O(g) 
A) 2Al(OH)3(s)   Al2O3(s)+ 3H2O(g) 
B) Al(OH)3(s)+ SiO2(s)   AlSiO3(s)+ 3H2O(g) 
C) 2Al(OH)3(s)+ O2(g)   Al2O3(s)+ 3H2O(g) 
D) Al(OH)3(s)+ C(s)   Al2O3(s)+ CO2(g)+ H2O(g) 
E) 2Al(OH)3(s)+ 3CO(g)   Al2O3(s)+ 3CO2(g)+ 3H2O(g)

Question 14

What is an advantage of hydrometallurgical processes over pyrometallurgical processes?

Accepted Answer

Hydrometallurgy generally does

Question 15

Why can't chromium and nickel form a miscible solid solution over the entire composition range?

Accepted Answer

A) The lever rule says that these two metals can't coexist in an alloy. 
B) The two metals crystallize into different cubic structures in their pure forms. 
C) The tetrahedral holes in the nickel crystal are not large enough to accommodate the chromium. 
D) The octahedral holes in the chromium crystal are not large enough to accommodate the nickel. 
E) Chromium atoms can only fit inside tetrahedral holes,which are not present in the structure of pure nickel. 
A) The lever rule says that these two metals can't coexist in an alloy. 
B) The two metals crystallize into different cubic structures in their pure forms. 
C) The tetrahedral holes in the nickel crystal are not large enough to accommodate the chromium. 
D) The octahedral holes in the chromium crystal are not large enough to accommodate the nickel. 
E) Chromium atoms can only fit inside tetrahedral holes,which are not present in the structure of pure nickel.

Question 16

Which of the following is an example of a hydrometallurgical process?

Accepted Answer

A) Al(OH)3(s)+ SiO2(s)   AlSiO3(s)+ 3H2O(g) 
B) Ni(OH)2(s)   NiO(s)+ H2O(g) 
C) 2Al(OH)3(s)   Al2O3(s)+ 3H2O(g) 
D) CuSO4∙5H2O(s)+ H2O(l)   CuS(s)+ H2SO4(aq)+ 5OH⁻(aq) 
E) Al2O3∙nH2O(s)+ 2OH⁻(aq)+ 2H2O(l)   2Al(OH)4⁻(aq) 
A) Al(OH)3(s)+ SiO2(s)   AlSiO3(s)+ 3H2O(g) 
B) Ni(OH)2(s)   NiO(s)+ H2O(g) 
C) 2Al(OH)3(s)   Al2O3(s)+ 3H2O(g) 
D) CuSO4∙5H2O(s)+ H2O(l)   CuS(s)+ H2SO4(aq)+ 5OH⁻(aq) 
E) Al2O3∙nH2O(s)+ 2OH⁻(aq)+ 2H2O(l)   2Al(OH)4⁻(aq)

Question 17

Which of the following is TRUE concerning interstitial alloys?

Accepted Answer

A) The metal takes on the properties of the foreign atoms once they are present. 
B) Small atoms fit in between the metal atoms in the crystal structure. 
C) Brass is an example of an interstitial alloy. 
D) The foreign atoms present weaken the metallic structure. 
E) They are alloys composed of two nonmetallic elements. 
A) The metal takes on the properties of the foreign atoms once they are present. 
B) Small atoms fit in between the metal atoms in the crystal structure. 
C) Brass is an example of an interstitial alloy. 
D) The foreign atoms present weaken the metallic structure. 
E) They are alloys composed of two nonmetallic elements.

Question 18

Which compound in the following reaction is the slag? 
2Ca3(PO4)2(s)+ 6SiO2(s)+ 10C(s)   P4(g)+ 6CaSiO3(l)+ 10CO(g)

Accepted Answer

A) CaSiO3 
B) CO 
C) P4 
D) SiO2 
E) Ca3(PO4)2 
A) CaSiO3 
B) CO 
C) P4 
D) SiO2 
E) Ca3(PO4)2

Question 19

Which of the following is TRUE concerning substitutional alloys?

Accepted Answer

A) The metals involved must have similar radii. 
B) One type of metal atom is inserted in between the metal atoms in the initial crystal structure of the other metal. 
C) The two metals must be miscible over the entire composition range. 
D) Titanium carbide is an example of a substitutional alloy. 
E) The metals forming a substitutional alloy must have very different electronegativities. 
A) The metals involved must have similar radii. 
B) One type of metal atom is inserted in between the metal atoms in the initial crystal structure of the other metal. 
C) The two metals must be miscible over the entire composition range. 
D) Titanium carbide is an example of a substitutional alloy. 
E) The metals forming a substitutional alloy must have very different electronegativities.

Question 20

Which of the following is an example of roasting?

Accepted Answer

A) CaCO3(s)   CaO(s)+ CO2(g) 
B) PbO(s)+ CO(g)   Pb(l)+ CO2(g) 
C) SnO2(s)+ 2C(s)   Sn(l)+ 2CO(g) 
D) Ni(OH)2(s)   NiO(s)+ H2O(g) 
E) 2CuS(s)+ 3O2   2CuO(s)+ 2SO2(g) 
A) CaCO3(s)   CaO(s)+ CO2(g) 
B) PbO(s)+ CO(g)   Pb(l)+ CO2(g) 
C) SnO2(s)+ 2C(s)   Sn(l)+ 2CO(g) 
D) Ni(OH)2(s)   NiO(s)+ H2O(g) 
E) 2CuS(s)+ 3O2   2CuO(s)+ 2SO2(g)

Exam 24: Metals and Metallurgy

An interstitial alloy contains carbon in one-fourth of the octahedral holes of a closest-packed metal,M.What is the formula of this alloy?

Roasting is

Which of the following is TRUE concerning point "D" on the figure?

Powder metallurgy is

Identify the normal crystal structure at room temperature for Ni.

Describe the difference between a substitutional alloy and an interstitial alloy.

What method is used to obtain pure aluminum metal from Al2O3?

Why is zinc used to coat steel objects?

Pyrometallurgy is the

Which of the following is a general property of a metal?

Which of the following is TRUE concerning point "B" on the figure?

What are the components of bronze?

Identify a balanced equation for the calcination of Al(OH)3.

What is an advantage of hydrometallurgical processes over pyrometallurgical processes?

Why can't chromium and nickel form a miscible solid solution over the entire composition range?

Which of the following is an example of a hydrometallurgical process?

Which of the following is TRUE concerning interstitial alloys?

Which compound in the following reaction is the slag? 2Ca3(PO4)2(s)+ 6SiO2(s)+ 10C(s) P4(g)+ 6CaSiO3(l)+ 10CO(g)

Which of the following is TRUE concerning substitutional alloys?

Which of the following is an example of roasting?

Units of Measurement for Physical and Chemical Change

Atoms and Elements

Molecules,compounds,and Nomenclature

Chemical Reactions and Stoichiometry

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, valence Bond Theory, and Molecular Orbital Theory

Liquids, solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry I: Structures

Organic Chemistry II: Reactions

Biochemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Compounds

Filters

What method is used to obtain pure aluminum metal from Al₂O₃?

Identify a balanced equation for the calcination of Al(OH)₃.

Which compound in the following reaction is the slag? 2Ca₃(PO₄)₂(s)+ 6SiO₂(s)+ 10C(s) P₄(g)+ 6CaSiO₃(l)+ 10CO(g)