Question 1

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

Accepted Answer

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

Question 2

How many electrons are transferred in the redox reaction of a typical flashlight battery?
Zn + 2MnO2 + H2O → Zn2+ + Mn2O3 + 2OH −

Accepted Answer

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

Question 3

In electrochemical cells ____ occurs at the anode and ____ occurs at the cathode.

Accepted Answer

A) oxidation, reduction 
B) reduction, oxidation 
C) oxidation, oxidation 
D) gain of mass, reduction 
E) loss of mass, oxidation 
A) oxidation, reduction 
B) reduction, oxidation 
C) oxidation, oxidation 
D) gain of mass, reduction 
E) loss of mass, oxidation

Question 4

Which of these is a possible cathodic reaction which 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 5

Which of these substances is the most common reducing agent?

Accepted Answer

A) H2 
B) H3O+ 
C) O2 
D) H2O 
E) CO 
A) H2 
B) H3O+ 
C) O2 
D) H2O 
E) CO

Question 6

The series of redox reactions which provide energy for animals is known as ____.

Accepted Answer

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

Question 7

Which of these equations correctly represents photosynthesis?

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 8

Which of these is correctly associated with the cathode?
I. Positive electrode
II. Electrode at which a substance loses electrons
III. Electrode at which reduction occurs

Accepted Answer

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

Question 9

Which of these substances is the most common oxidizing agent?

Accepted Answer

A) CO 
B) H3O+ 
C) O2 
D) H2 
E) C 
A) CO 
B) H3O+ 
C) O2 
D) H2 
E) C

Question 10

Which of these statements correctly explains why batteries run out of energy?

Accepted Answer

A) The battery solutions boil off. 
B) The battery solutions solidify. 
C) The battery reactants are used up. 
D) The external circuit becomes corroded. 
E) The battery salt bridge reacts with the reactants. 
A) The battery solutions boil off. 
B) The battery solutions solidify. 
C) The battery reactants are used up. 
D) The external circuit becomes corroded. 
E) The battery salt bridge reacts with the reactants.

Question 11

Which of these are oxidation-reduction reactions?
I. 3H2 + N2 → 2NH3
II. Cu2O + C → 2Cu + CO
III. Fe2O3 + 3CO → 2Fe + CO2
IV. 2K + Br2 → 2KBr

Accepted Answer

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

Question 12

Which of these is a characteristic associated with reduction?
I. Losing electrons
II. Gaining hydrogen
III. Losing oxygen

Accepted Answer

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

Question 13

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) All of these statements are correct. 
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) All of these statements are correct.

Question 14

Which substance is the reducing agent in this redox equation?
HF + Cl2 → F2 + HCl

Accepted Answer

A) HF 
B) Cl2 
C) F 
D) HCl 
E) none of these 
A) HF 
B) Cl2 
C) F 
D) HCl 
E) none of these

Question 15

Which of these batteries has a continually renewable reactant source?

Accepted Answer

A) Zinc-copper battery 
B) Leclanche dry cell 
C) Lead-acid battery 
D) Alkaline battery 
E) Fuel cells 
A) Zinc-copper battery 
B) Leclanche dry cell 
C) Lead-acid battery 
D) Alkaline battery 
E) Fuel cells

Question 16

Coating iron with a more oxidative metal than itself to prevent rusting is known as ____.

Accepted Answer

A) scrubbing 
B) galvanizing 
C) proofing 
D) protecting 
E) seal coating 
A) scrubbing 
B) galvanizing 
C) proofing 
D) protecting 
E) seal coating

Question 17

Which of these is a characteristic associated with oxidation?

Accepted Answer

A) Gaining electrons 
B) Gaining hydrogen 
C) Losing oxygen 
D) All of the above 
E) None of the above 
A) Gaining electrons 
B) Gaining hydrogen 
C) Losing oxygen 
D) All of the above 
E) None of the above

Question 18

Which statements about the lead-acid battery is correct?
Pb + PbO2 + 4H+ + SO42 −  → 2PbSO4 + 2H2O

Accepted Answer

A) Lead is oxidized. 
B) Lead oxide acts as the cathode. 
C) Both the anode and cathode reactions result in the formation of PbSO4. 
D) Lead and lead oxide can be reformed from lead sulfate with the application of an outside electrical current. 
E) All of these statements are correct. 
A) Lead is oxidized. 
B) Lead oxide acts as the cathode. 
C) Both the anode and cathode reactions result in the formation of PbSO4. 
D) Lead and lead oxide can be reformed from lead sulfate with the application of an outside electrical current. 
E) All of these statements are correct.

Question 19

During respiration, sugars are ____ in the presence of oxygen to producecarbon dioxide and water.

Accepted Answer

A) dissolved 
B) formed 
C) reduced 
D) oxidized 
E) recycled 
A) dissolved 
B) formed 
C) reduced 
D) oxidized 
E) recycled

Question 20

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

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) none of the above 
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) none of the above

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

How many electrons are transferred in the redox reaction of a typical flashlight battery? Zn + 2MnO₂ + H₂O → Zn²⁺ + Mn₂O₃ + 2OH⁻

In electrochemical cells occurs at the anode and occurs at the cathode.

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

Which of these substances is the most common reducing agent?

The series of redox reactions which provide energy for animals is known as ____.

Which of these equations correctly represents photosynthesis?

Which of these is correctly associated with the cathode? I. Positive electrode II. Electrode at which a substance loses electrons III. Electrode at which reduction occurs

Which of these substances is the most common oxidizing agent?

Which of these statements correctly explains why batteries run out of energy?

Which of these are oxidation-reduction reactions? I. 3H₂ + N₂ → 2NH₃ II. Cu₂O + C → 2Cu + CO III. Fe₂O₃ + 3CO → 2Fe + CO₂ IV. 2K + Br₂ → 2KBr

Which of these is a characteristic associated with reduction? I. Losing electrons II. Gaining hydrogen III. Losing oxygen

Which of these statements about redox reactions is incorrect ?

Which substance is the reducing agent in this redox equation? HF + Cl₂ → F₂ + HCl

Which of these batteries has a continually renewable reactant source?

Coating iron with a more oxidative metal than itself to prevent rusting is known as ____.

Which of these is a characteristic associated with oxidation?

Which statements about the lead-acid battery is correct? Pb + PbO₂ + 4H⁺ + SO₄^{2 −} → 2PbSO₄ + 2H₂O

During respiration, sugars are ____ in the presence of oxygen to producecarbon dioxide and water.

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

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Exam 14: Oxidation and Reduction

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

How many electrons are transferred in the redox reaction of a typical flashlight battery? Zn + 2MnO2 + H2O → Zn2+ + Mn2O3 + 2OH −

In electrochemical cells ____ occurs at the anode and ____ occurs at the cathode.

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

Which of these substances is the most common reducing agent?

The series of redox reactions which provide energy for animals is known as ____.

Which of these equations correctly represents photosynthesis?

Which of these is correctly associated with the cathode? I. Positive electrode II. Electrode at which a substance loses electrons III. Electrode at which reduction occurs

Which of these substances is the most common oxidizing agent?

Which of these statements correctly explains why batteries run out of energy?

Which of these are oxidation-reduction reactions? I. 3H2 + N2 → 2NH3 II. Cu2O + C → 2Cu + CO III. Fe2O3 + 3CO → 2Fe + CO2 IV. 2K + Br2 → 2KBr

Which of these is a characteristic associated with reduction? I. Losing electrons II. Gaining hydrogen III. Losing oxygen

Which of these statements about redox reactions is incorrect ?

Which substance is the reducing agent in this redox equation? HF + Cl2 → F2 + HCl

Which of these batteries has a continually renewable reactant source?

Coating iron with a more oxidative metal than itself to prevent rusting is known as ____.

Which of these is a characteristic associated with oxidation?

Which statements about the lead-acid battery is correct? Pb + PbO2 + 4H+ + SO42 − → 2PbSO4 + 2H2O

During respiration, sugars are ____ in the presence of oxygen to producecarbon dioxide and water.

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

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

Nanotechnology

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

How many electrons are transferred in the redox reaction of a typical flashlight battery? Zn + 2MnO₂ + H₂O → Zn²⁺ + Mn₂O₃ + 2OH⁻

In electrochemical cells occurs at the anode and occurs at the cathode.

Which of these are oxidation-reduction reactions? I. 3H₂ + N₂ → 2NH₃ II. Cu₂O + C → 2Cu + CO III. Fe₂O₃ + 3CO → 2Fe + CO₂ IV. 2K + Br₂ → 2KBr

Which substance is the reducing agent in this redox equation? HF + Cl₂ → F₂ + HCl

Which statements about the lead-acid battery is correct? Pb + PbO₂ + 4H⁺ + SO₄^{2 −} → 2PbSO₄ + 2H₂O