Question 1

With respect to volume,approximately what percentage of the air we breathe is composed of elemental argon?

Accepted Answer

A) ≈ 20% 
B) ≈ 1% 
C) ≈ 80% 
D) ≈ 50% 
A) ≈ 20% 
B) ≈ 1% 
C) ≈ 80% 
D) ≈ 50% B

Question 2

In the reaction Cu⁺ + Fe → Cu + Fe²⁺ (Note: The reaction is not balanced.)

Accepted Answer

A) Fe is the reducing agent. 
B) Cu is the reducing agent. 
C) Cu⁺ is the reducing agent. 
D) Fe²⁺ is the reducing agent. 
A) Fe is the reducing agent. 
B) Cu is the reducing agent. 
C) Cu⁺ is the reducing agent. 
D) Fe²⁺ is the reducing agent. A

Question 3

The only natural process that produces oxygen is

Accepted Answer

A) growth. 
B) photosynthesis. 
C) humidity. 
D) electrochemical cells. 
A) growth. 
B) photosynthesis. 
C) humidity. 
D) electrochemical cells. B

Question 4

Which of the following is NOT true of a catalyst?

Accepted Answer

A) A catalyst will speed up the rate of a reaction. 
B) A catalyst will lower the activation energy for a reaction. 
C) A catalyst is used up when it catalyzes a reaction. 
D) A catalyst is not changed when it catalyzes a reaction. 
A) A catalyst will speed up the rate of a reaction. 
B) A catalyst will lower the activation energy for a reaction. 
C) A catalyst is used up when it catalyzes a reaction. 
D) A catalyst is not changed when it catalyzes a reaction.

Question 5

Human cells obtain energy by

Accepted Answer

A) oxidizing carbohydrates. 
B) reducing proteins. 
C) reducing carbon dioxide. 
D) absorbing sunlight. 
A) oxidizing carbohydrates. 
B) reducing proteins. 
C) reducing carbon dioxide. 
D) absorbing sunlight.

Question 6

The small "button" cells used in hearing aids and hand calculators are being replaced by ________ cells.

Accepted Answer

A) Ni-Cad 
B) hydrogen 
C) zinc-air 
D) copper-acid 
A) Ni-Cad 
B) hydrogen 
C) zinc-air 
D) copper-acid

Question 7

The oxidation number of F⁻¹ is

Accepted Answer

A) -1. 
B) 0) 
C) +1. 
D) 2) 
A) -1. 
B) 0) 
C) +1. 
D) 2)

Question 8

All of the following are reducing agents EXCEPT

Accepted Answer

A) antioxidants. 
B) coal (coke). 
C) hydrogen. 
D) chlorine. 
A) antioxidants. 
B) coal (coke). 
C) hydrogen. 
D) chlorine.

Question 9

Which of the following is a definition of oxidation?

Accepted Answer

A) Oxidation is the loss of electrons. 
B) Oxidation is the addition of hydrogen. 
C) Oxidation is the loss of oxygen. 
D) Oxidation is the addition of electrons. 
A) Oxidation is the loss of electrons. 
B) Oxidation is the addition of hydrogen. 
C) Oxidation is the loss of oxygen. 
D) Oxidation is the addition of electrons.

Question 10

________ is used as an explosive and a heart medication.

Accepted Answer

A) Nitroglycerin 
B) Trinitrotoluene 
C) Ammonia nitrate 
D) Urea 
A) Nitroglycerin 
B) Trinitrotoluene 
C) Ammonia nitrate 
D) Urea

Question 11

Photosynthesis involves the

Accepted Answer

A) reduction of carbohydrates. 
B) reduction of water. 
C) oxidation of water. 
D) oxidation of carbohydrates. 
A) reduction of carbohydrates. 
B) reduction of water. 
C) oxidation of water. 
D) oxidation of carbohydrates.

Question 12

The removal of silver tarnish from silverware using aluminum foil and a solution of electrolyte is an example of

Accepted Answer

A) oxidation of aluminum metal. 
B) reduction of silver ions. 
C) an electrochemical cell. 
D) all of the above 
A) oxidation of aluminum metal. 
B) reduction of silver ions. 
C) an electrochemical cell. 
D) all of the above

Question 13

All of the following are commonly involved in explosions EXCEPT

Accepted Answer

A) aluminum metal. 
B) ammonium nitrate. 
C) nitroglycerin. 
D) trinitrotoluene. 
A) aluminum metal. 
B) ammonium nitrate. 
C) nitroglycerin. 
D) trinitrotoluene.

Question 14

A substance which lowers the activation energy of a chemical reaction is called a(n)

Accepted Answer

A) reducing agent. 
B) catalyst. 
C) oxidizing agent. 
D) carcinogen. 
A) reducing agent. 
B) catalyst. 
C) oxidizing agent. 
D) carcinogen.

Question 15

ANFO is an explosive mixture of ammonium nitrate,NH₄NO₃,and fuel oil.When this mixture explodes,the ammonium nitrate undergoes

Accepted Answer

A) oxidation. 
B) reduction. 
C) both oxidation and reduction. 
D) neither oxidation nor reduction. 
A) oxidation. 
B) reduction. 
C) both oxidation and reduction. 
D) neither oxidation nor reduction.

Question 16

Hydrogen gas converts tungsten oxide to tungsten metal.Hydrogen (H₂)is a(n)

Accepted Answer

A) acid. 
B) base. 
C) oxidizing agent. 
D) reducing agent. 
A) acid. 
B) base. 
C) oxidizing agent. 
D) reducing agent.

Question 17

Consider the following reaction: 2 Fe + 3 Mg²⁺ → 2 Fe³⁺ + 3 Mg
The half-reaction for the reduction in this reaction is

Accepted Answer

A) Fe → Fe³⁺ + 3 e⁻ 
B) Fe³⁺ + 3 e⁻ → Fe 
C) Mg → Mg²⁺ + 2 e⁻ 
D) Mg²⁺ + 2 e⁻ → Mg 
A) Fe → Fe³⁺ + 3 e⁻ 
B) Fe³⁺ + 3 e⁻ → Fe 
C) Mg → Mg²⁺ + 2 e⁻ 
D) Mg²⁺ + 2 e⁻ → Mg

Question 18

The carbon in C₂H₆O₂ is ________ in the following reaction: C₂H₆O₂ → C₂H₄O₂ + H₂

Accepted Answer

A) oxidized 
B) reduced 
C) neutralized 
D) electrolyzed 
A) oxidized 
B) reduced 
C) neutralized 
D) electrolyzed

Question 19

This compound is a powerful oxidizing agent and a harmful pollutant; yet a layer of it in the upper stratosphere serves as a shield from harmful ultraviolet radiation from the sun.

Accepted Answer

A) CO₂ 
B) O₂ 
C) SO₃ 
D) O₃ (ozone) 
A) CO₂ 
B) O₂ 
C) SO₃ 
D) O₃ (ozone)

Question 20

Which substance is an oxidizing agent?

Accepted Answer

A) NaOH 
B) H₂O₂ 
C) HI 
D) LiBr 
A) NaOH 
B) H₂O₂ 
C) HI 
D) LiBr

Exam 8: Oxidation and Reduction

With respect to volume,approximately what percentage of the air we breathe is composed of elemental argon?

In the reaction Cu⁺ + Fe → Cu + Fe²⁺ (Note: The reaction is not balanced.)

The only natural process that produces oxygen is

Which of the following is NOT true of a catalyst?

Human cells obtain energy by

The small "button" cells used in hearing aids and hand calculators are being replaced by ________ cells.

The oxidation number of F⁻¹ is

All of the following are reducing agents EXCEPT

Which of the following is a definition of oxidation?

________ is used as an explosive and a heart medication.

Photosynthesis involves the

The removal of silver tarnish from silverware using aluminum foil and a solution of electrolyte is an example of

All of the following are commonly involved in explosions EXCEPT

A substance which lowers the activation energy of a chemical reaction is called a(n)

ANFO is an explosive mixture of ammonium nitrate,NH₄NO₃,and fuel oil.When this mixture explodes,the ammonium nitrate undergoes

Hydrogen gas converts tungsten oxide to tungsten metal.Hydrogen (H₂)is a(n)

Consider the following reaction: 2 Fe + 3 Mg²⁺ → 2 Fe³⁺ + 3 Mg The half-reaction for the reduction in this reaction is

The carbon in C₂H₆O₂ is ________ in the following reaction: C₂H₆O₂ → C₂H₄O₂ + H₂

This compound is a powerful oxidizing agent and a harmful pollutant; yet a layer of it in the upper stratosphere serves as a shield from harmful ultraviolet radiation from the sun.

Which substance is an oxidizing agent?

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