Question 1

When carbon monoxide is used to reduce an ore as in a blast furnace, it is converted to .

Accepted Answer

A)  methane 
B)  graphite 
C)  methanol 
D)  carbonate 
E)  carbon dioxide 
A)  methane 
B)  graphite 
C)  methanol 
D)  carbonate 
E)  carbon dioxide

Question 2

An alloy is a

Accepted Answer

A)  a mineral containing two or more metals. 
B)  pure metal. 
C)  heterogeneous mixture of two metals. 
D)  metallic material that is composed of two or more elements. 
E)  nonmetal with some properties of a metal. 
A)  a mineral containing two or more metals. 
B)  pure metal. 
C)  heterogeneous mixture of two metals. 
D)  metallic material that is composed of two or more elements. 
E)  nonmetal with some properties of a metal.

Question 3

Which of the following is not an alloy?

Accepted Answer

A)  steel 
B)  dental amalgam 
C)  ceramic 
D)  brass 
E)  sterling silver 
A)  steel 
B)  dental amalgam 
C)  ceramic 
D)  brass 
E)  sterling silver

Question 4

Smelting is

Accepted Answer

A)  thermal decomposition of an ore with elimination of a gaseous product. 
B)  cooling a molten metal to make it solidify. 
C)  heating an ore to make it react with a gas in a furnace. 
D)  addition of calcium to a molten ore. 
E)  melting and subsequent reaction of molten ores resulting in the formation of layers. 
A)  thermal decomposition of an ore with elimination of a gaseous product. 
B)  cooling a molten metal to make it solidify. 
C)  heating an ore to make it react with a gas in a furnace. 
D)  addition of calcium to a molten ore. 
E)  melting and subsequent reaction of molten ores resulting in the formation of layers.

Question 5

Heterogeneous alloys

Accepted Answer

A)  have properties that depend on the manner in which the solid is formed. 
B)  have properties that depend on composition. 
C)  have properties that depend on the manner in which the melt is solidified. 
D)  do not have uniform composition throughout. 
E)  All of the above are true. 
A)  have properties that depend on the manner in which the solid is formed. 
B)  have properties that depend on composition. 
C)  have properties that depend on the manner in which the melt is solidified. 
D)  do not have uniform composition throughout. 
E)  All of the above are true.

Question 6

The lanthanide contraction is responsible for the fact that

Accepted Answer

A)  Zr and Zn have similar oxidation states. 
B)  Zr and Hf have the same oxidation states. 
C)  Zr and Y have about the same radius. 
D)  Zr and Hf have about the same radius. 
E)  Zr and Nb have similar oxidation states. 
A)  Zr and Zn have similar oxidation states. 
B)  Zr and Hf have the same oxidation states. 
C)  Zr and Y have about the same radius. 
D)  Zr and Hf have about the same radius. 
E)  Zr and Nb have similar oxidation states.

Question 7

Chromium is in the +6 oxidation state in both chromate and dichromate anions.

Accepted Answer

A) True 
 B)False

Question 8

The anode sludges from copper refining are important sources of what metal(s)?

Accepted Answer

A)  all of the above 
B)  gold 
C)  both a and b 
D)  silver 
E)  aluminum 
A)  all of the above 
B)  gold 
C)  both a and b 
D)  silver 
E)  aluminum

Question 9

Which element is typically not added to steel to modify its properties?

Accepted Answer

A)  vanadium 
B)  carbon 
C)  nickel 
D)  chromium 
E)  nitrogen 
A)  vanadium 
B)  carbon 
C)  nickel 
D)  chromium 
E)  nitrogen

Question 10

The hydrometallurgical process used in refining gold ore entails converting metallic gold to a water- soluble complex. The formula of the complex is .

Accepted Answer

A)  Au(CN)2- 
B)  Au(CN)43- 
C)  Au(CO)4+ 
D)  Au(NH3)2+ 
E)  Au(CO)42- 
A)  Au(CN)2- 
B)  Au(CN)43- 
C)  Au(CO)4+ 
D)  Au(NH3)2+ 
E)  Au(CO)42-

Question 11

Gold and the platinum group metals are found in nature in metallic form because

Accepted Answer

A)  they are relatively abundant. 
B)  they are soluble in water. 
C)  they are relatively inert. 
D)  they are solids at room temperature. 
E)  they are highly reactive. 
A)  they are relatively abundant. 
B)  they are soluble in water. 
C)  they are relatively inert. 
D)  they are solids at room temperature. 
E)  they are highly reactive.

Question 12

A thermal process that causes reactions between an ore and the atmosphere of the furnace is called
__________

Accepted Answer

A)  slag. 
B)  smelting. 
C)  roasting. 
D)  calcining. 
E)  refining. 
A)  slag. 
B)  smelting. 
C)  roasting. 
D)  calcining. 
E)  refining.

Question 13

At high temperatures, carbon can be used as a reducing agent for metal oxides. What is the coefficient of carbon in the balanced equation for the production of manganese and CO2 from manganese(II) oxide?

Accepted Answer

A)  3 
B)  4 
C)  1 
D)  5 
E)  2 
A)  3 
B)  4 
C)  1 
D)  5 
E)  2

Question 14

What is produced when a carbonate is calcined?

Accepted Answer

A)  the free metal and carbon dioxide 
B)  the free metal and sodium carbonate 
C)  water and the metal hydride 
D)  the free metal and sulfur dioxide 
E)  the metal oxide and carbon dioxide 
A)  the free metal and carbon dioxide 
B)  the free metal and sodium carbonate 
C)  water and the metal hydride 
D)  the free metal and sulfur dioxide 
E)  the metal oxide and carbon dioxide

Question 15

Calcium chloride is added to sodium chloride prior to melting it for electrolysis in a Downs cell
)

Accepted Answer

A)  to provide calcium ions which serve as the cathode 
B)  to lower the melting point 
C)  to increase the concentration of chloride ions 
D)  to make the chloride ions easier to oxidize 
E)  to make the sodium ions easier to reduce 
A)  to provide calcium ions which serve as the cathode 
B)  to lower the melting point 
C)  to increase the concentration of chloride ions 
D)  to make the chloride ions easier to oxidize 
E)  to make the sodium ions easier to reduce

Question 16

Gangue is the unwanted material that accompanies an ore when it is mined.

Accepted Answer

A) True 
 B)False

Question 17

A mixture of oxygen and argon are blown through molten iron that is produced in a blast furnace for the purpose of

Accepted Answer

A)  removing carbon, sulfur, and other impurities. 
B)  oxidizing the iron before it cools. 
C)  cooling the molten iron. 
D)  completing the reduction of iron. 
E)  removing other metals. 
A)  removing carbon, sulfur, and other impurities. 
B)  oxidizing the iron before it cools. 
C)  cooling the molten iron. 
D)  completing the reduction of iron. 
E)  removing other metals.

Question 18

Many metals are ductile, which means that they can be hammered into thin sheets.

Accepted Answer

A) True 
 B)False

Question 19

Sodium metal cannot be produced by electrolysis of an aqueous solution of sodium chloride because

Accepted Answer

A)  the iron cathode would be corroded by the salt water. 
B)  water is more easily reduced than sodium ions. 
C)  the carbon anode is more easily reduced than sodium ions. 
D)  the production of chlorine gas interferes with the reduction of sodium ions. 
E)  water is more easily oxidized than sodium metal. 
A)  the iron cathode would be corroded by the salt water. 
B)  water is more easily reduced than sodium ions. 
C)  the carbon anode is more easily reduced than sodium ions. 
D)  the production of chlorine gas interferes with the reduction of sodium ions. 
E)  water is more easily oxidized than sodium metal.

Question 20

A disadvantage to leaching gold with aqueous solutions of cyanide ion is that

Accepted Answer

A)  it is a complicated process requiring more than two dozen separate steps. 
B)  it requires the use of ores with a very high concentration of gold. 
C)  sodium cyanide is very expensive. 
D)  the method is a potential environmental hazard. 
E)  the method does not produce gold of high enough purity. 
A)  it is a complicated process requiring more than two dozen separate steps. 
B)  it requires the use of ores with a very high concentration of gold. 
C)  sodium cyanide is very expensive. 
D)  the method is a potential environmental hazard. 
E)  the method does not produce gold of high enough purity.

Exam 23: Metals and Metallurgy

When carbon monoxide is used to reduce an ore as in a blast furnace, it is converted to .

An alloy is a

Which of the following is not an alloy?

Smelting is

Heterogeneous alloys

The lanthanide contraction is responsible for the fact that

Chromium is in the +6 oxidation state in both chromate and dichromate anions.

The anode sludges from copper refining are important sources of what metal(s)?

Which element is typically not added to steel to modify its properties?

The hydrometallurgical process used in refining gold ore entails converting metallic gold to a water- soluble complex. The formula of the complex is .

Gold and the platinum group metals are found in nature in metallic form because

A thermal process that causes reactions between an ore and the atmosphere of the furnace is called __________

At high temperatures, carbon can be used as a reducing agent for metal oxides. What is the coefficient of carbon in the balanced equation for the production of manganese and CO2 from manganese(II) oxide?

What is produced when a carbonate is calcined?

Calcium chloride is added to sodium chloride prior to melting it for electrolysis in a Downs cell )

Gangue is the unwanted material that accompanies an ore when it is mined.

A mixture of oxygen and argon are blown through molten iron that is produced in a blast furnace for the purpose of

Many metals are ductile, which means that they can be hammered into thin sheets.

Sodium metal cannot be produced by electrolysis of an aqueous solution of sodium chloride because

A disadvantage to leaching gold with aqueous solutions of cyanide ion is that

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Gases

Intermolecular Forces, Liquids, and Solids

Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Electrochemistry

Nuclear Chemistry

Chemistry of the Nonmetals

Chemistry of Coordination Compounds

The Chemistry of Life: Organic and Biological Chemistry

Filters

At high temperatures, carbon can be used as a reducing agent for metal oxides. What is the coefficient of carbon in the balanced equation for the production of manganese and CO₂from manganese(II) oxide?