Question 1

Hydrometallurgy is

Accepted Answer

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

Question 2

Identify the substances that are homogeneous,naturally occurring,crystalline inorganic solids.

Accepted Answer

A) slag 
B) minerals 
C) ores 
D) gangue 
E) alloy 
A) slag 
B) minerals 
C) ores 
D) gangue 
E) alloy

Question 3

Calcination is

Accepted Answer

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

Question 4

Smelting is

Accepted Answer

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

Question 5

Which of the following describes flux?

Accepted Answer

A) a waste material that is the product of smelting a metal ore 
B) the aqueous portion of the gangue separated from a metal ore 
C) a low-density waste product,formed from the reaction of gangue with another substance,that can be easily separated from the metal ore of interest 
D) a substance that reacts with the gangue to make a low-density liquid compound that can be easily separated from the metal of interest 
E) a low-density material that floats on the liquid during purification by flotation 
A) a waste material that is the product of smelting a metal ore 
B) the aqueous portion of the gangue separated from a metal ore 
C) a low-density waste product,formed from the reaction of gangue with another substance,that can be easily separated from the metal ore of interest 
D) a substance that reacts with the gangue to make a low-density liquid compound that can be easily separated from the metal of interest 
E) a low-density material that floats on the liquid during purification by flotation

Question 6

An interstitial alloy contains hydrogen in half of the tetrahedral holes of a closest-packed metal,M.What is the formula of this alloy?

Accepted Answer

A) MH 
B) MH4 
C) MH2 
D) M2H 
E) M4H 
A) MH 
B) MH4 
C) MH2 
D) M2H 
E) M4H

Question 7

Which of the following is an example of calcination?

Accepted Answer

A) 2CuS(s)+ 3O2   2CuO(s)+ 2SO2(g) 
B) SnO2(s)+ 2C(s)   Sn(l)+ 2CO(g) 
C) CaCO3(s)+ SiO2(s)   CaSiO3(l)+ CO2(g) 
D) MgCO3(s)   MgO(s)+ CO2(g) 
E) PbO(s)+ CO(g)   Pb(l)+ CO2(g) 
A) 2CuS(s)+ 3O2   2CuO(s)+ 2SO2(g) 
B) SnO2(s)+ 2C(s)   Sn(l)+ 2CO(g) 
C) CaCO3(s)+ SiO2(s)   CaSiO3(l)+ CO2(g) 
D) MgCO3(s)   MgO(s)+ CO2(g) 
E) PbO(s)+ CO(g)   Pb(l)+ CO2(g)

Question 8

Which of the following is an example of smelting?

Accepted Answer

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

Question 9

Which of the following describes gangue?

Accepted Answer

A) the undesirable product formed during smelting 
B) the undesirable portion of a metal-containing ore 
C) the volatile product formed during calcination 
D) a waste material that is the product of smelting a metal ore 
E) a crude metal that still has to be further purified for industrial use 
A) the undesirable product formed during smelting 
B) the undesirable portion of a metal-containing ore 
C) the volatile product formed during calcination 
D) a waste material that is the product of smelting a metal ore 
E) a crude metal that still has to be further purified for industrial use

Question 10

Electrometallurgy is

Accepted Answer

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

Question 11

Identify a balanced reaction for the smelting of SnO2 with carbon.

Accepted Answer

A) SnO2(s)+ CO2(g)   SnCO3(s) 
B) SnO2(s)+ CaCO3(s)   SnC(s)+ CaO(s)+ O2(g) 
C) SnO2(s)+ 2C(s)   Sn(l)+ 2CO(g) 
D) 2SnO2(s)+ 2CaC2(s)   2SnC2(s)+ 2CaO(s)+ O2(g) 
E) SnO2(s)+ 2CO(g)   Sn(l)+ 2CO2(g) 
A) SnO2(s)+ CO2(g)   SnCO3(s) 
B) SnO2(s)+ CaCO3(s)   SnC(s)+ CaO(s)+ O2(g) 
C) SnO2(s)+ 2C(s)   Sn(l)+ 2CO(g) 
D) 2SnO2(s)+ 2CaC2(s)   2SnC2(s)+ 2CaO(s)+ O2(g) 
E) SnO2(s)+ 2CO(g)   Sn(l)+ 2CO2(g)

Question 12

Which of the following processes is used to form metal components from very small metal particles?

Accepted Answer

A) electrometallurgy 
B) hydrometallurgy 
C) pyrometallurgy 
D) powder metallurgy 
E) smelting 
A) electrometallurgy 
B) hydrometallurgy 
C) pyrometallurgy 
D) powder metallurgy 
E) smelting

Question 13

Why does a "two-phase" structure occur in a substitutional alloy?

Accepted Answer

When a substitutional alloy is formed fr

Question 14

Leaching is

Accepted Answer

A) melting an ore and separating it from the lower density gangue. 
B) selectively dissolving a metal in solution to separate it from its ore. 
C) the process of heating an ore to drive off volatile compounds. 
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) melting an ore and separating it from the lower density gangue. 
B) selectively dissolving a metal in solution to separate it from its ore. 
C) the process of heating an ore to drive off volatile compounds. 
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.

Question 15

Identify a balanced equation for the calcination of NiCO3.

Accepted Answer

A) NiCO3(s)+ CaO(s)   NiO(s)+ CaCO3(s) 
B) NiCO3(s)   NiO(s)+ CO2(g) 
C) NiCO3(s)+ C(s)   NiO(s)+ 2CO(g) 
D) NiCO3(s)+ SiO2(s)   NiSiO3(s)+ CO2(g) 
E) NiCO3(s)+ CO(g)   NiO(s)+ 2CO2(g) 
A) NiCO3(s)+ CaO(s)   NiO(s)+ CaCO3(s) 
B) NiCO3(s)   NiO(s)+ CO2(g) 
C) NiCO3(s)+ C(s)   NiO(s)+ 2CO(g) 
D) NiCO3(s)+ SiO2(s)   NiSiO3(s)+ CO2(g) 
E) NiCO3(s)+ CO(g)   NiO(s)+ 2CO2(g)

Question 16

Which of the following describes slag?

Accepted Answer

A) a waste material that is the product of smelting a metal ore 
B) the aqueous portion of the gangue separated from a metal ore 
C) a low-density waste product,formed from the reaction of gangue with another substance,that can be easily separated from the metal ore of interest 
D) a substance that reacts with the gangue to make a low-density liquid compound that can be easily separated from the metal of interest 
E) a heavy precipitate containing by-products obtained during the purification process 
A) a waste material that is the product of smelting a metal ore 
B) the aqueous portion of the gangue separated from a metal ore 
C) a low-density waste product,formed from the reaction of gangue with another substance,that can be easily separated from the metal ore of interest 
D) a substance that reacts with the gangue to make a low-density liquid compound that can be easily separated from the metal of interest 
E) a heavy precipitate containing by-products obtained during the purification process

Question 17

What is the highest oxidation number of chromium?

Accepted Answer

A) +3 
B) +4 
C) +5 
D) +7 
E) +6 
A) +3 
B) +4 
C) +5 
D) +7 
E) +6

Question 18

Which of the following is TRUE of powder metallurgy?

Accepted Answer

A) Machining is required after forming the component. 
B) There is more waste than with casting the molten metal. 
C) Iron powder from mill scrap makes a denser component than iron particles formed through water atomization. 
D) It is used to separate gangue from the rest of the metal ore. 
E) It usually requires lower temperatures than casting the molten metal. 
A) Machining is required after forming the component. 
B) There is more waste than with casting the molten metal. 
C) Iron powder from mill scrap makes a denser component than iron particles formed through water atomization. 
D) It is used to separate gangue from the rest of the metal ore. 
E) It usually requires lower temperatures than casting the molten metal.

Question 19

What is the difference between ferromagnetism and paramagnetism?

Accepted Answer

When a substance is paramagnetic,it cont

Question 20

Which substance is the best conductor of electricity?

Accepted Answer

A) arsenic 
B) boron 
C) silver 
D) tellurium 
A) arsenic 
B) boron 
C) silver 
D) tellurium

Exam 24: Metals and Metallurgy

Hydrometallurgy is

Identify the substances that are homogeneous,naturally occurring,crystalline inorganic solids.

Calcination is

Smelting is

Which of the following describes flux?

An interstitial alloy contains hydrogen in half of the tetrahedral holes of a closest-packed metal,M.What is the formula of this alloy?

Which of the following is an example of calcination?

Which of the following is an example of smelting?

Which of the following describes gangue?

Electrometallurgy is

Identify a balanced reaction for the smelting of SnO2 with carbon.

Which of the following processes is used to form metal components from very small metal particles?

Why does a "two-phase" structure occur in a substitutional alloy?

Leaching is

Identify a balanced equation for the calcination of NiCO3.

Which of the following describes slag?

What is the highest oxidation number of chromium?

Which of the following is TRUE of powder metallurgy?

What is the difference between ferromagnetism and paramagnetism?

Which substance is the best conductor of electricity?

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

Identify a balanced reaction for the smelting of SnO₂ with carbon.

Identify a balanced equation for the calcination of NiCO₃.