Question 1

Why is either pure oxygen or oxygen diluted with argon used in a converter instead of air?

Accepted Answer

A)  The oxygen concentration is too low to function efficiently at removing impurities. 
B)  The carbon monoxide in air reacts with the iron to form a volatile, and toxic, iron carbonyl. 
C)  The nitrogen in air will react with iron to form iron nitride that will make the iron brittle. 
D)  Because it's cheaper. 
E)  The carbon dioxide in air will cause the iron to oxidize and form rust. 
A)  The oxygen concentration is too low to function efficiently at removing impurities. 
B)  The carbon monoxide in air reacts with the iron to form a volatile, and toxic, iron carbonyl. 
C)  The nitrogen in air will react with iron to form iron nitride that will make the iron brittle. 
D)  Because it's cheaper. 
E)  The carbon dioxide in air will cause the iron to oxidize and form rust. C

Question 2

In the Bayer process, the purpose of filtration after the ore has been digested in concentrated sodium hydroxide is .

Accepted Answer

A)  to remove the sodium ions from the sodium hydroxide solution 
B)  to separate the soluble aluminum complex from the insoluble iron impurities 
C)  to remove the anode sludge 
D)  to separate the insoluble aluminum oxide from the soluble iron impurity 
E)  to separate the aluminum metal from the hydroxide ions 
A)  to remove the sodium ions from the sodium hydroxide solution 
B)  to separate the soluble aluminum complex from the insoluble iron impurities 
C)  to remove the anode sludge 
D)  to separate the insoluble aluminum oxide from the soluble iron impurity 
E)  to separate the aluminum metal from the hydroxide ions B

Question 3

A basic slag is needed in steelmaking to

Accepted Answer

A)  remove SiO2 as silicates. 
B)  reduce any nitrogen- containing compounds to N2. 
C)  oxidize any carbon- containing compounds to CO2. 
D)  react with any BrØnsted- Lowry acids present. 
E)  provide CaO to remove phosphorus oxides as Ca3(PO4)2. 
A)  remove SiO2 as silicates. 
B)  reduce any nitrogen- containing compounds to N2. 
C)  oxidize any carbon- containing compounds to CO2. 
D)  react with any BrØnsted- Lowry acids present. 
E)  provide CaO to remove phosphorus oxides as Ca3(PO4)2. E

Question 4

What is the purpose of adding zinc powder to a solution of Au(CN)2- ?

Accepted Answer

A)  to precipitate the cyanide- gold complex 
B)  to form a gold- zinc alloy 
C)  to reduce the gold in the cyanide complex to gold metal 
D)  to precipitate the cyanide ion 
E)  to oxidize the gold in the cyanide complex to gold metal 
A)  to precipitate the cyanide- gold complex 
B)  to form a gold- zinc alloy 
C)  to reduce the gold in the cyanide complex to gold metal 
D)  to precipitate the cyanide ion 
E)  to oxidize the gold in the cyanide complex to gold metal

Question 5

Part of the Bayer process involves the digestion of crushed ore in concentrated aqueous sodium hydroxide. This process carried out at high pressure .

Accepted Answer

A)  to prevent formation of aluminum hydroxide 
B)  to prevent boiling 
C)  to accelerate formation of iron hydroxide 
D)  to lower the boiling temperature of the mixture 
E)  to prevent formation of iron hydroxide 
A)  to prevent formation of aluminum hydroxide 
B)  to prevent boiling 
C)  to accelerate formation of iron hydroxide 
D)  to lower the boiling temperature of the mixture 
E)  to prevent formation of iron hydroxide

Question 6

Roasting HgS in the presence of oxygen produces the free metal and SO2. What is the coefficient of HgS when the equation for this reaction is completed and balanced?

Accepted Answer

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

Question 7

CuS has a very low solubility in water. However, it will dissolve in nitric acid due to the following reaction.   What is the coefficient of CuS when this equation is balanced?

Accepted Answer

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

Question 8

The product in the Hall electrometallurgical process is

Accepted Answer

A)  iron. 
B)  copper. 
C)  gold. 
D)  silver. 
E)  aluminum. 
A)  iron. 
B)  copper. 
C)  gold. 
D)  silver. 
E)  aluminum.

Question 9

A mineral is

Accepted Answer

A)  metal in its elemental form. 
B)  a vitamin. 
C)  a transition metal ion. 
D)  a solid inorganic compound that contains one or more metals. 
E)  source of carbon. 
A)  metal in its elemental form. 
B)  a vitamin. 
C)  a transition metal ion. 
D)  a solid inorganic compound that contains one or more metals. 
E)  source of carbon.

Question 10

Which statement below is true?

Accepted Answer

A)  Most metallic elements are found in the lithosphere in oxidation state zero. 
B)  There exists little correlation between the abundance of an element in the lithosphere and its commercial extraction and use. 
C)  The United States has plentiful ore fields of all strategic metals. 
D)  New mining techniques and relatively untapped ore fields mean that the environmental impacts of mineral extraction will decrease significantly in the future. 
E)  The most important commercial class of minerals is the silicates. 
A)  Most metallic elements are found in the lithosphere in oxidation state zero. 
B)  There exists little correlation between the abundance of an element in the lithosphere and its commercial extraction and use. 
C)  The United States has plentiful ore fields of all strategic metals. 
D)  New mining techniques and relatively untapped ore fields mean that the environmental impacts of mineral extraction will decrease significantly in the future. 
E)  The most important commercial class of minerals is the silicates.

Question 11

The undesirable material that is separated from an ore during the concentration process is called
)

Accepted Answer

A)  flocculent 
B)  silicate 
C)  gangue 
D)  slag 
E)  leachate 
A)  flocculent 
B)  silicate 
C)  gangue 
D)  slag 
E)  leachate

Question 12

Processes used to reduce metal ores or to refine metals that are based on the process of electrolysis are collectively referred to as _.

Accepted Answer

A)  calcination 
B)  pyrometallurgy 
C)  hydrometallurgy 
D)  roasting 
E)  electrometallurgy 
A)  calcination 
B)  pyrometallurgy 
C)  hydrometallurgy 
D)  roasting 
E)  electrometallurgy

Question 13

Selectively dissolving a metal- containing compound from an ore is called

Accepted Answer

A)  sol formation. 
B)  refining. 
C)  leaching. 
D)  oxidation. 
E)  converting. 
A)  sol formation. 
B)  refining. 
C)  leaching. 
D)  oxidation. 
E)  converting.

Question 14

Roasting of the disulfide of molybdenum in O2 produces which products?

Accepted Answer

A)  MoO3 (s) + SO3 (g) 
B)  MoO4 (s) + SO2 (g) 
C)  Mo (s) + SO2 ( g) 
D)  MoO3 (s) + SO2 (g) 
E)  Mo (s) + MoS (s) + SO2 (g) 
A)  MoO3 (s) + SO3 (g) 
B)  MoO4 (s) + SO2 (g) 
C)  Mo (s) + SO2 ( g) 
D)  MoO3 (s) + SO2 (g) 
E)  Mo (s) + MoS (s) + SO2 (g)

Question 15

24 karat gold contains % gold.

Accepted Answer

A)  100 
B)  24 
C)  75 
D)  50 
E)  25 
A)  100 
B)  24 
C)  75 
D)  50 
E)  25

Question 16

Which of the following are not commonly used as sources of metals?

Accepted Answer

A)  silicates 
B)  oxides 
C)  sulfides 
D)  carbonates 
E)  All of the above are commonly used sources of metals. 
A)  silicates 
B)  oxides 
C)  sulfides 
D)  carbonates 
E)  All of the above are commonly used sources of metals.

Question 17

6 karat gold contains % gold.

Accepted Answer

A)  6 
B)  25 
C)  100 
D)  75 
E)  50 
A)  6 
B)  25 
C)  100 
D)  75 
E)  50

Question 18

Which one of the following metallic elements is most likely to be found as the free metal in nature?

Accepted Answer

A)  Au 
B)  Al 
C)  Li 
D)  Ca 
E)  Fe 
A)  Au 
B)  Al 
C)  Li 
D)  Ca 
E)  Fe

Question 19

The lithosphere is the

Accepted Answer

A)  deepest part of the ocean. 
B)  portion of the atmosphere closest to the Earth. 
C)  portion of the atmosphere furthest from the Earth. 
D)  solid surface of the Earth. 
E)  molten core of the Earth. 
A)  deepest part of the ocean. 
B)  portion of the atmosphere closest to the Earth. 
C)  portion of the atmosphere furthest from the Earth. 
D)  solid surface of the Earth. 
E)  molten core of the Earth.

Question 20

During roasting, the metal reacts with

Accepted Answer

A)  oxygen. 
B)  iron. 
C)  sulfur. 
D)  the furnace atmosphere. 
E)  carbon monoxide. 
A)  oxygen. 
B)  iron. 
C)  sulfur. 
D)  the furnace atmosphere. 
E)  carbon monoxide.

Exam 23: Metals and Metallurgy

Why is either pure oxygen or oxygen diluted with argon used in a converter instead of air?

In the Bayer process, the purpose of filtration after the ore has been digested in concentrated sodium hydroxide is .

A basic slag is needed in steelmaking to

What is the purpose of adding zinc powder to a solution of Au(CN)2- ?

Part of the Bayer process involves the digestion of crushed ore in concentrated aqueous sodium hydroxide. This process carried out at high pressure .

Roasting HgS in the presence of oxygen produces the free metal and SO2. What is the coefficient of HgS when the equation for this reaction is completed and balanced?

CuS has a very low solubility in water. However, it will dissolve in nitric acid due to the following reaction. What is the coefficient of CuS when this equation is balanced?

The product in the Hall electrometallurgical process is

A mineral is

Which statement below is true?

The undesirable material that is separated from an ore during the concentration process is called )

Processes used to reduce metal ores or to refine metals that are based on the process of electrolysis are collectively referred to as _.

Selectively dissolving a metal- containing compound from an ore is called

Roasting of the disulfide of molybdenum in O2 produces which products?

24 karat gold contains % gold.

Which of the following are not commonly used as sources of metals?

6 karat gold contains % gold.

Which one of the following metallic elements is most likely to be found as the free metal in nature?

The lithosphere is the

During roasting, the metal reacts with

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

What is the purpose of adding zinc powder to a solution of Au(CN)₂^-?

Roasting HgS in the presence of oxygen produces the free metal and SO₂. What is the coefficient of HgS when the equation for this reaction is completed and balanced?

Roasting of the disulfide of molybdenum in O₂produces which products?