Question 1

A sliced apple will turn brown when exposed to air because  _____.

Accepted Answer

A)  oxygen in the air oxidizes the chemicals present in the apple 
B)  oxygen in the air reduces the chemicals present in the apple 
C)  nitrogen in the air oxidizes the chemicals present in the apple 
D)  nitrogen in the air reduces the chemicals present in the apple 
E)  hydrogen in the air reduces the chemicals present in the apple 
A)  oxygen in the air oxidizes the chemicals present in the apple 
B)  oxygen in the air reduces the chemicals present in the apple 
C)  nitrogen in the air oxidizes the chemicals present in the apple 
D)  nitrogen in the air reduces the chemicals present in the apple 
E)  hydrogen in the air reduces the chemicals present in the apple

Question 2

Which of these equations correctly represents the Haber process?

Accepted Answer

A)  3H2 + N2 → 2NH3 
B)  Cu2O + C → 2Cu + CO 
C)  Fe2O3 + 3CO → 2Fe + CO2 
D)  C6H12O6 + 6O2 → 6CO2 + 6H2O 
E)  6CO2 + 6H2O → C6H12O6 + 6O2 
A)  3H2 + N2 → 2NH3 
B)  Cu2O + C → 2Cu + CO 
C)  Fe2O3 + 3CO → 2Fe + CO2 
D)  C6H12O6 + 6O2 → 6CO2 + 6H2O 
E)  6CO2 + 6H2O → C6H12O6 + 6O2

Question 3

Which of the following substances is the oxidizing agent in the chemical reaction ? PbCl4 + SnCl2 → PbCl2 + SnCl4

Accepted Answer

A)  Pb 
B)  Sn 
C)  SnCl2 
D)  PbCl4 
E)  Cl2 
A)  Pb 
B)  Sn 
C)  SnCl2 
D)  PbCl4 
E)  Cl2

Question 4

Which of these reactions occurs at the anode in this fuel cell?
​
2H2 + O2 → 2H2O

Accepted Answer

A)  2H2 + 4OH −  → 4H2O + 4e −  
B)  O2 + 2H2 O + 4e −  → 4OH −  
C)  4OH −  + 4H+ → 4H2O 
D)  4OH −  + 4e − → 4H2O 
E)  None of these 
A)  2H2 + 4OH −  → 4H2O + 4e −  
B)  O2 + 2H2 O + 4e −  → 4OH −  
C)  4OH −  + 4H+ → 4H2O 
D)  4OH −  + 4e − → 4H2O 
E)  None of these

Question 5

Which of the following substances is the oxidizing agent in the chemical reaction ? 2CO + 2NO → 2CO2 + N2

Accepted Answer

A)  CO 
B)  NO 
C)  CO2 
D)  N 
E)  C 
A)  CO 
B)  NO 
C)  CO2 
D)  N 
E)  C

Question 6

Which of these is a possible cathodic reaction that  occurs during the corrosion of iron?

Accepted Answer

A)  2Fe(s) → 2Fe2+(aq) + 4e −  
B)  2H+(aq) + 2e −  → H2(g) 
C)  2H2O(l) + 2e −  → H2(g) + 2OH − (aq) 
D)  O2(g) + 2H2O(l) + 4e −  → 4OH − (aq) 
E)  SO2(g) + O2(g) + 2e −  → SO42 − (aq) 
A)  2Fe(s) → 2Fe2+(aq) + 4e −  
B)  2H+(aq) + 2e −  → H2(g) 
C)  2H2O(l) + 2e −  → H2(g) + 2OH − (aq) 
D)  O2(g) + 2H2O(l) + 4e −  → 4OH − (aq) 
E)  SO2(g) + O2(g) + 2e −  → SO42 − (aq)

Question 7

The series of redox reactions that provides animals energy is known as _____.

Accepted Answer

A)  respiration 
B)  photosynthesis 
C)  the Haber process 
D)  metabolism 
E)  rusting 
A)  respiration 
B)  photosynthesis 
C)  the Haber process 
D)  metabolism 
E)  rusting

Question 8

The process by which plants generate glucose is known as _____.

Accepted Answer

A)  respiration 
B)  photosynthesis 
C)  the Haber process 
D)  digestion 
E)  rusting 
A)  respiration 
B)  photosynthesis 
C)  the Haber process 
D)  digestion 
E)  rusting

Question 9

Which of the following substances is oxidized in the chemical reaction ?
​
Fe2O3 + 3CO → 2Fe + CO2

Accepted Answer

A)  Fe2O3 
B)  CO 
C)  2Fe 
D)  C 
E)  O2 
A)  Fe2O3 
B)  CO 
C)  2Fe 
D)  C 
E)  O2

Question 10

Which substance is oxidized in this redox reaction? Br − (aq) + MnO4 − (aq) → Br2(l) + Mn2+(aq)

Accepted Answer

A)  Br  −  
B)  MnO4 −  
C)  Br2 
D)  Mn2+ 
E)  None of these 
A)  Br  −  
B)  MnO4 −  
C)  Br2 
D)  Mn2+ 
E)  None of these

Question 11

Which of these statements about redox reactions is incorrect ?

Accepted Answer

A)  Oxidation is the gain of oxygen. 
B)  Oxidation is the loss of electrons. 
C)  Reduction is the gain of electrons. 
D)  Oxidation is the gain of hydrogen. 
E)  Oxidation is the loss of hydrogen 
A)  Oxidation is the gain of oxygen. 
B)  Oxidation is the loss of electrons. 
C)  Reduction is the gain of electrons. 
D)  Oxidation is the gain of hydrogen. 
E)  Oxidation is the loss of hydrogen

Question 12

Which of these substances is/are  not a reducing agent used in industrial processes?

Accepted Answer

A)  CO 
B)  H2 
C)  O2 
D)  C 
E)  Both C and CO 
A)  CO 
B)  H2 
C)  O2 
D)  C 
E)  Both C and CO

Question 13

Which of these substances are used in the reduction of metal ores?
I. CO
II. C
III. O2
IV. H2

Accepted Answer

A)  I only 
B)  II only 
C)  III only 
D)  I and II 
E)  I, II, and III 
A)  I only 
B)  II only 
C)  III only 
D)  I and II 
E)  I, II, and III

Question 14

In a lead-acid battery, the anode consists of porous lead plates in a(n) _____ solution.

Accepted Answer

A)  HCl 
B)  H2SO4 
C)  AgNO3 
D)  ZnNO3 
E)  MgSO4 
A)  HCl 
B)  H2SO4 
C)  AgNO3 
D)  ZnNO3 
E)  MgSO4

Question 15

Which of these statements about respiration is incorrect?

Accepted Answer

A)  Carbon is oxidized during respiration. 
B)  Respiration is an exothermic process. 
C)  Carbon dioxide and water are produced during respiration. 
D)  Animals, including humans, use respiration to oxidize food for energy. 
E)  Carbon is reduced during respiration. 
A)  Carbon is oxidized during respiration. 
B)  Respiration is an exothermic process. 
C)  Carbon dioxide and water are produced during respiration. 
D)  Animals, including humans, use respiration to oxidize food for energy. 
E)  Carbon is reduced during respiration.

Question 16

The fraction of iron produced in the US to replace rusted iron is approximately _____.

Accepted Answer

A)  1/2 
B)  1/3 
C)  1/4 
D)  1/5 
E)  1/6 
A)  1/2 
B)  1/3 
C)  1/4 
D)  1/5 
E)  1/6

Question 17

During photosynthesis _____is _____to form glucose and oxygen.

Accepted Answer

A)  carbon; oxidized 
B)  carbon; reduced 
C)  water; reduced 
D)  hydrogen; oxidized 
E)  oxygen; reduced 
A)  carbon; oxidized 
B)  carbon; reduced 
C)  water; reduced 
D)  hydrogen; oxidized 
E)  oxygen; reduced

Question 18

Which of these batteries has a continually renewable reactant source?

Accepted Answer

A)  Zinc-copper batteries 
B)  Leclanch é dry cells 
C)  Lead-acid batteries 
D)  Alkaline batteries 
E)  Fuel cells 
A)  Zinc-copper batteries 
B)  Leclanch é dry cells 
C)  Lead-acid batteries 
D)  Alkaline batteries 
E)  Fuel cells

Question 19

Which of the following is true of  free radicals?

Accepted Answer

A)  They are very reactive. 
B)  They are very unstable. 
C)  They contribute to aging in humans. 
D)  They can alter biological molecules. 
E)  All of these   are true. 
A)  They are very reactive. 
B)  They are very unstable. 
C)  They contribute to aging in humans. 
D)  They can alter biological molecules. 
E)  All of these   are true.

Question 20

Which of these is not an application of oxidizing agents?

Accepted Answer

A)  Disinfectants 
B)  Antiseptics 
C)  Household bleaches 
D)  Water treatment 
E)  Metal processing 
A)  Disinfectants 
B)  Antiseptics 
C)  Household bleaches 
D)  Water treatment 
E)  Metal processing

A sliced apple will turn brown when exposed to air because _____.

Which of these equations correctly represents the Haber process?

Which of the following substances is the oxidizing agent in the chemical reaction ? PbCl₄ + SnCl₂ → PbCl₂ + SnCl₄

Which of these reactions occurs at the anode in this fuel cell? 2H₂ + O₂ → 2H₂O

Which of the following substances is the oxidizing agent in the chemical reaction ? 2CO + 2NO → 2CO₂ + N₂

Which of these is a possible cathodic reaction that occurs during the corrosion of iron?

The series of redox reactions that provides animals energy is known as _____.

The process by which plants generate glucose is known as _____.

Which of the following substances is oxidized in the chemical reaction ? Fe₂O₃ + 3CO → 2Fe + CO₂

Which substance is oxidized in this redox reaction? Br⁻(aq) + MnO₄⁻(aq) → Br₂(l) + Mn²⁺(aq)

Which of these statements about redox reactions is incorrect ?

Which of these substances is/are not a reducing agent used in industrial processes?

Which of these substances are used in the reduction of metal ores? I. CO II. C III. O₂ IV. H₂

In a lead-acid battery, the anode consists of porous lead plates in a(n) _____ solution.

Which of these statements about respiration is incorrect?

The fraction of iron produced in the US to replace rusted iron is approximately _____.

During photosynthesis _is _to form glucose and oxygen.

Which of these batteries has a continually renewable reactant source?

Which of the following is true of free radicals?

Which of these is not an application of oxidizing agents?

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Exam 14: Oxidation and Reduction

A sliced apple will turn brown when exposed to air because _____.

Which of these equations correctly represents the Haber process?

Which of the following substances is the oxidizing agent in the chemical reaction ? PbCl4 + SnCl2 → PbCl2 + SnCl4

Which of these reactions occurs at the anode in this fuel cell? ​ 2H2 + O2 → 2H2O

Which of the following substances is the oxidizing agent in the chemical reaction ? 2CO + 2NO → 2CO2 + N2

Which of these is a possible cathodic reaction that occurs during the corrosion of iron?

The series of redox reactions that provides animals energy is known as _____.

The process by which plants generate glucose is known as _____.

Which of the following substances is oxidized in the chemical reaction ? ​ Fe2O3 + 3CO → 2Fe + CO2

Which substance is oxidized in this redox reaction? Br − (aq) + MnO4 − (aq) → Br2(l) + Mn2+(aq)

Which of these statements about redox reactions is incorrect ?

Which of these substances is/are not a reducing agent used in industrial processes?

Which of these substances are used in the reduction of metal ores? I. CO II. C III. O2 IV. H2

In a lead-acid battery, the anode consists of porous lead plates in a(n) _____ solution.

Which of these statements about respiration is incorrect?

The fraction of iron produced in the US to replace rusted iron is approximately _____.

During photosynthesis _____is _____to form glucose and oxygen.

Which of these batteries has a continually renewable reactant source?

Which of the following is true of free radicals?

Which of these is not an application of oxidizing agents?

Molecular Reasons

The Chemists Toolbox

Atoms and Elements

Molecules, Compounds, and Chemical Reactions

Chemical Bonding

Organic Chemistry

Light and Color

Nuclear Chemistry

Energy for Today

Energy for Tomorrow: Solar and Other Renewable Energy Sources

The Air Around Us

The Liquids and Solids Around Us: Especially Water

Acids and Bases: the Molecules Responsible for Sour and Bitter

The Chemistry of Household Products

Biochemistry and Biotechnology

Drugs and Medicine: Healing, Helping, and Hurting

The Chemistry of Food

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Which of the following substances is the oxidizing agent in the chemical reaction ? PbCl₄ + SnCl₂ → PbCl₂ + SnCl₄

Which of these reactions occurs at the anode in this fuel cell? 2H₂ + O₂ → 2H₂O

Which of the following substances is the oxidizing agent in the chemical reaction ? 2CO + 2NO → 2CO₂ + N₂

Which of the following substances is oxidized in the chemical reaction ? Fe₂O₃ + 3CO → 2Fe + CO₂

Which substance is oxidized in this redox reaction? Br⁻(aq) + MnO₄⁻(aq) → Br₂(l) + Mn²⁺(aq)

Which of these substances are used in the reduction of metal ores? I. CO II. C III. O₂ IV. H₂

During photosynthesis _is _to form glucose and oxygen.