Question 1

Hydrometallurgy uses __________________ to separate a metal from its ore.

Accepted Answer

A)  solid phase chemical properties 
B)  electrical processes 
C)  thermal processes 
D)  aqueous chemical processes 
E)  molten salt processes 
A)  solid phase chemical properties 
B)  electrical processes 
C)  thermal processes 
D)  aqueous chemical processes 
E)  molten salt processes

Question 2

What gas is produced at the anode in the Downs cell, in which molten NaCl is electrolyzed?

Accepted Answer

The answer of What gas is produced at the anode...

Question 3

Aluminum and magnesium form are light metals which are used in many structural applications. Although they are highly active metals (as their electrode potentials suggest), they can often be used without the use of paint or other applied finishes to protect them against corrosion. How is this possible?

Accepted Answer

Both Al and Mg have strong, adherent, re

Question 4

Which one of the following species or compounds reacts at the cathode in the Hall-Héroult process?

Accepted Answer

A)  Al2O3 
B)  Al(OH)3 
C)  F¯ 
D)  AlF63¯ 
E)  C 
A)  Al2O3 
B)  Al(OH)3 
C)  F¯ 
D)  AlF63¯ 
E)  C

Question 5

The atmosphere contains about 700. billion metric tons of carbon in the form of carbon dioxide. In the carbon cycle, about 200. billion metric tons of carbon (as carbon dioxide) enters the atmosphere each year. Assuming that 200. billion metric tons of carbon also leaves the atmosphere annually, how many years does the average carbon atom spend in the atmosphere in each cycle?

Accepted Answer

A)  0.29 years 
B)  3.5 years 
C)  500. years 
D)  140,000 years 
E)  More information is needed in order to calculate the answer. 
A)  0.29 years 
B)  3.5 years 
C)  500. years 
D)  140,000 years 
E)  More information is needed in order to calculate the answer.

Question 6

Calcium oxide is added to molten iron in the production of carbon steel in order to

Accepted Answer

A)  convert silicon and phosphorus oxides to slag which can be decanted from the molten steel. 
B)  serve as a scrubber to remove sulfur dioxide from the gases leaving the furnace. 
C)  remove any traces of acid which could weaken the steel. 
D)  add a small amount of oxygen to the steel to prevent corrosion and increase its strength. 
E)  create gangue. 
A)  convert silicon and phosphorus oxides to slag which can be decanted from the molten steel. 
B)  serve as a scrubber to remove sulfur dioxide from the gases leaving the furnace. 
C)  remove any traces of acid which could weaken the steel. 
D)  add a small amount of oxygen to the steel to prevent corrosion and increase its strength. 
E)  create gangue.

Question 7

In the industrial electrolysis of aqueous NaCl (the chlor-alkali process), the modern trend is toward the use of cells incorporating polymer membranes to separate the anode and cathode solutions.

Accepted Answer

A) True 
 B)False

Question 8

Pyrometallurgy uses __________________ to separate a metal from its ore.

Accepted Answer

A)  solid phase chemical properties 
B)  electrical processes 
C)  thermal processes 
D)  aqueous chemical processes 
E)  explosives 
A)  solid phase chemical properties 
B)  electrical processes 
C)  thermal processes 
D)  aqueous chemical processes 
E)  explosives

Question 9

What are the main mineral sources of phosphorus?

Accepted Answer

A)  phosphides 
B)  phosphites 
C)  phosphors 
D)  phosphates 
E)  elemental phosphorus 
A)  phosphides 
B)  phosphites 
C)  phosphors 
D)  phosphates 
E)  elemental phosphorus

Question 10

The ______________ process uses a boiling 30% sodium hydroxide solution to treat bauxite.

Accepted Answer

A)  Bayer 
B)  Hall-Héroult 
C)  Dow 
D)  Frasch 
E)  Haber 
A)  Bayer 
B)  Hall-Héroult 
C)  Dow 
D)  Frasch 
E)  Haber

Question 11

Sulfur trioxide is the anhydride of sulfuric acid. However, SO3 is not added directly to water during the synthesis of sulfuric acid because

Accepted Answer

A)  hydration of SO3 is very exothermic and difficult to control. 
B)  hydration of SO3 is very endothermic and proceeds too slowly to be profitable. 
C)  at high temperatures, water vapor catalyzes polymerization of SO3. 
D)  vapor phase sulfuric acid is corrosive and limits the useful life of the reactor. 
E)  the water would decompose under such conditions. 
A)  hydration of SO3 is very exothermic and difficult to control. 
B)  hydration of SO3 is very endothermic and proceeds too slowly to be profitable. 
C)  at high temperatures, water vapor catalyzes polymerization of SO3. 
D)  vapor phase sulfuric acid is corrosive and limits the useful life of the reactor. 
E)  the water would decompose under such conditions.

Question 12

The leaching of gold can be represented by the equation   In this reaction, identify the oxidant, the reductant and the oxidation numbers of the elements which change.

Accepted Answer

The oxidant is O₂, the reductan

Question 13

What gas is produced during the Hall-Héroult process for production of aluminum?

Accepted Answer

A)  chlorine, Cl2 
B)  oxygen, O2 
C)  hydrogen, H2 
D)  ammonia, NH3 
E)  carbon dioxide, CO2 
A)  chlorine, Cl2 
B)  oxygen, O2 
C)  hydrogen, H2 
D)  ammonia, NH3 
E)  carbon dioxide, CO2

Question 14

Electrolysis is used as the last step in isolating pure __________________.

Accepted Answer

A)  iron 
B)  boron 
C)  aluminum 
D)  selenium 
E)  carbon 
A)  iron 
B)  boron 
C)  aluminum 
D)  selenium 
E)  carbon

Question 15

The Earth's core consists mainly of:

Accepted Answer

A)  Ni 
B)  O 
C)  Al 
D)  Si 
E)  Fe 
A)  Ni 
B)  O 
C)  Al 
D)  Si 
E)  Fe

Question 16

The most common source for commercial production of sodium is called

Accepted Answer

A)  sodalite. 
B)  limestone. 
C)  halite. 
D)  galena. 
E)  pyrite. 
A)  sodalite. 
B)  limestone. 
C)  halite. 
D)  galena. 
E)  pyrite.

Hydrometallurgy uses __________________ to separate a metal from its ore.

What gas is produced at the anode in the Downs cell, in which molten NaCl is electrolyzed?

Which one of the following species or compounds reacts at the cathode in the Hall-Héroult process?

Calcium oxide is added to molten iron in the production of carbon steel in order to

In the industrial electrolysis of aqueous NaCl (the chlor-alkali process), the modern trend is toward the use of cells incorporating polymer membranes to separate the anode and cathode solutions.

Pyrometallurgy uses __________________ to separate a metal from its ore.

What are the main mineral sources of phosphorus?

The ______________ process uses a boiling 30% sodium hydroxide solution to treat bauxite.

Sulfur trioxide is the anhydride of sulfuric acid. However, SO₃ is not added directly to water during the synthesis of sulfuric acid because

The leaching of gold can be represented by the equation In this reaction, identify the oxidant, the reductant and the oxidation numbers of the elements which change.

What gas is produced during the Hall-Héroult process for production of aluminum?

Electrolysis is used as the last step in isolating pure __________________.

The Earth's core consists mainly of:

The most common source for commercial production of sodium is called

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Exam 22: The Elements in Nature and Industry

Hydrometallurgy uses __________________ to separate a metal from its ore.

What gas is produced at the anode in the Downs cell, in which molten NaCl is electrolyzed?

Which one of the following species or compounds reacts at the cathode in the Hall-Héroult process?

Calcium oxide is added to molten iron in the production of carbon steel in order to

In the industrial electrolysis of aqueous NaCl (the chlor-alkali process), the modern trend is toward the use of cells incorporating polymer membranes to separate the anode and cathode solutions.

Pyrometallurgy uses __________________ to separate a metal from its ore.

What are the main mineral sources of phosphorus?

The ______________ process uses a boiling 30% sodium hydroxide solution to treat bauxite.

Sulfur trioxide is the anhydride of sulfuric acid. However, SO3 is not added directly to water during the synthesis of sulfuric acid because

The leaching of gold can be represented by the equation In this reaction, identify the oxidant, the reductant and the oxidation numbers of the elements which change.

What gas is produced during the Hall-Héroult process for production of aluminum?

Electrolysis is used as the last step in isolating pure __________________.

The Earth's core consists mainly of:

The most common source for commercial production of sodium is called

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

Three Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Sulfur trioxide is the anhydride of sulfuric acid. However, SO₃ is not added directly to water during the synthesis of sulfuric acid because