Question 1

Which substance acts as the cathode in the lead-acid automobile battery?
​
Pb + PbO2 + 4H+ + SO42 −  → 2PbSO4 + 2H2O

Accepted Answer

A)  Pb 
B)  PbO2 
C)  4H+ 
D)  SO42 −  
E)  H2O 
A)  Pb 
B)  PbO2 
C)  4H+ 
D)  SO42 −  
E)  H2O B

Question 2

Which of these is not an advantage of the alkaline battery over the Leclanch é dry cell?

Accepted Answer

A)  Longer shelf life 
B)  Longer battery life 
C)  Less expensive 
D)  Less subject to corrosion 
E)  None of these 
A)  Longer shelf life 
B)  Longer battery life 
C)  Less expensive 
D)  Less subject to corrosion 
E)  None of these C

Question 3

Which  of the following  statements is incorrect ?

Accepted Answer

A)  Zinc is used for galvanization because it loses electrons more easily than iron. 
B)  Zinc is used for galvanization because it forms a film that protects the iron. 
C)  Zinc is used for galvanization because it cannot be oxidized. 
D)  None of the se are incorrect statements. 
E)  All of these  are incorrect statements. 
A)  Zinc is used for galvanization because it loses electrons more easily than iron. 
B)  Zinc is used for galvanization because it forms a film that protects the iron. 
C)  Zinc is used for galvanization because it cannot be oxidized. 
D)  None of the se are incorrect statements. 
E)  All of these  are incorrect statements. C

Question 4

Which of these metals is/are often used to help prevent the rusting of iron?
I. Al
II. Zn
III. Mg
IV. Na

Accepted Answer

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

Question 5

Which of these processes can occur at the cathode in an electrochemical cell?

Accepted Answer

A)  2Br  −  → Br2+ 2e −  
B)  Cr → Cr3+ + 3e −  
C)  Cu → Cu2+ + 2e −  
D)  Li+ + 1e −  → Li 
E)  H2 + 2OH −  → 2H2O + 2e −  
A)  2Br  −  → Br2+ 2e −  
B)  Cr → Cr3+ + 3e −  
C)  Cu → Cu2+ + 2e −  
D)  Li+ + 1e −  → Li 
E)  H2 + 2OH −  → 2H2O + 2e −

Question 6

Which of these equations correctly represents the photosynthesis process?

Accepted Answer

A)  3H2 + N2 → 2NH3 
B)  Cu2O + C → 2Cu + CO 
C)  Fe2O3 + 3CO → 2Fe + CO2 
D)  C6H12O6 + 6O2 → 6CO2 + 6H2O 
E)  6CO  2  + 6H  2  O light → C  6  H  12  O  6  + 6O  2  
A)  3H2 + N2 → 2NH3 
B)  Cu2O + C → 2Cu + CO 
C)  Fe2O3 + 3CO → 2Fe + CO2 
D)  C6H12O6 + 6O2 → 6CO2 + 6H2O 
E)  6CO  2  + 6H  2  O light → C  6  H  12  O  6  + 6O  2

Question 7

Which of these is not  a component in the hydrogen - oxygen fuel cell?

Accepted Answer

A)  H2 
B)  KOH 
C)  O2 
D)  C 
E)  Pt 
A)  H2 
B)  KOH 
C)  O2 
D)  C 
E)  Pt

Question 8

Which substance acts as the anode in the lead-acid automobile battery?
​
Pb + PbO2 + 4H+ + SO42 −  → 2PbSO4 + 2H2O

Accepted Answer

A)  Pb 
B)  PbO2 
C)  4H+ 
D)  SO42 −  
E)  H2O 
A)  Pb 
B)  PbO2 
C)  4H+ 
D)  SO42 −  
E)  H2O

Question 9

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

Question 10

Which of these pairs is correctly matched?

Accepted Answer

A)  Oxidation = the loss of oxygen 
B)  Reduction = the reducing agent 
C)  Oxidation = the loss of electrons 
D)  Oxidation = the gain of hydrogen 
E)  Reduction = the loss of hydrogen 
A)  Oxidation = the loss of oxygen 
B)  Reduction = the reducing agent 
C)  Oxidation = the loss of electrons 
D)  Oxidation = the gain of hydrogen 
E)  Reduction = the loss of hydrogen

Question 11

During oxidation-reduction reactions, the substance that loses electrons is _____and the substance that gains electrons is _____.

Accepted Answer

A)  oxidized; reduced 
B)  reduced; oxidized 
C)  reduced; dissolved 
D)  reduced; accelerated 
E)  oxidized; dissolved 
A)  oxidized; reduced 
B)  reduced; oxidized 
C)  reduced; dissolved 
D)  reduced; accelerated 
E)  oxidized; dissolved

Question 12

During respiration, glucose molecules are _____ in the presence of oxygen to produce carbon 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 13

Which of these is/are  not used as an antiseptic?

Accepted Answer

A)  Hydrogen peroxide 
B)  Iodine 
C)  Benzoyl peroxide 
D)  Chlorine 
E)  All of these 
A)  Hydrogen peroxide 
B)  Iodine 
C)  Benzoyl peroxide 
D)  Chlorine 
E)  All of these

Question 14

Which of these processes can occur at the anode in an electrochemical cell?

Accepted Answer

A)  Br2 + 2e −  → 2Br −  
B)  Zn → Zn2+ + 2e −  
C)  Cu2+ + 2e −  → Cu 
D)  Na+ + 1e −  → Na 
E)  Pb4+ + 2e −  → Pb2+ 
A)  Br2 + 2e −  → 2Br −  
B)  Zn → Zn2+ + 2e −  
C)  Cu2+ + 2e −  → Cu 
D)  Na+ + 1e −  → Na 
E)  Pb4+ + 2e −  → Pb2+

Question 15

Which of these pairs represents the reactants in photosynthesis?

Accepted Answer

A)  Oxygen and carbon dioxide 
B)  Carbon dioxide and sugars 
C)  Water and carbon dioxide 
D)  Oxygen and water 
E)  Water and sugars 
A)  Oxygen and carbon dioxide 
B)  Carbon dioxide and sugars 
C)  Water and carbon dioxide 
D)  Oxygen and water 
E)  Water and sugars

Question 16

During respiration, glucose molecules are oxidized in the presence of _____to produce carbon dioxide and water.

Accepted Answer

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

Question 17

Which of these occur(s) during oxidation?
I. Gaining electrons
II. Losing hydrogen
III. Losing oxygen

Accepted Answer

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

Question 18

Which of these is an antioxidant?

Accepted Answer

A)  Vitamin E 
B)  Vitamin C 
C)  Beta carotene 
D)  All of these 
E)  None of these 
A)  Vitamin E 
B)  Vitamin C 
C)  Beta carotene 
D)  All of these 
E)  None of these

Question 19

Which of these substances is not found in a common Leclanch é dry cell?

Accepted Answer

A)  Zn 
B)  MnO2 
C)  NH4Cl 
D)  H2SO4 
E)  C 
A)  Zn 
B)  MnO2 
C)  NH4Cl 
D)  H2SO4 
E)  C

Question 20

Which of these is correctly associated with the cathode?
I. Electrode  with a positive charge
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

Which substance acts as the cathode in the lead-acid automobile battery? Pb + PbO₂ + 4H⁺ + SO₄^{2 −} → 2PbSO₄ + 2H₂O

Which of these is not an advantage of the alkaline battery over the Leclanch é dry cell?

Which of the following statements is incorrect ?

Which of these metals is/are often used to help prevent the rusting of iron? I. Al II. Zn III. Mg IV. Na

Which of these processes can occur at the cathode in an electrochemical cell?

Which of these equations correctly represents the photosynthesis process?

Which of these is not a component in the hydrogen - oxygen fuel cell?

Which substance acts as the anode in the lead-acid automobile battery? Pb + PbO₂ + 4H⁺ + SO₄^{2 −} → 2PbSO₄ + 2H₂O

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

Which of these pairs is correctly matched?

During oxidation-reduction reactions, the substance that loses electrons is _and the substance that gains electrons is _.

During respiration, glucose molecules are _____ in the presence of oxygen to produce carbon dioxide and water.

Which of these is/are not used as an antiseptic?

Which of these processes can occur at the anode in an electrochemical cell?

Which of these pairs represents the reactants in photosynthesis?

During respiration, glucose molecules are oxidized in the presence of _____to produce carbon dioxide and water.

Which of these occur(s) during oxidation? I. Gaining electrons II. Losing hydrogen III. Losing oxygen

Which of these is an antioxidant?

Which of these substances is not found in a common Leclanch é dry cell?

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

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Exam 14: Oxidation and Reduction

Which substance acts as the cathode in the lead-acid automobile battery? ​ Pb + PbO2 + 4H+ + SO42 − → 2PbSO4 + 2H2O

Which of these is not an advantage of the alkaline battery over the Leclanch é dry cell?

Which of the following statements is incorrect ?

Which of these metals is/are often used to help prevent the rusting of iron? I. Al II. Zn III. Mg IV. Na

Which of these processes can occur at the cathode in an electrochemical cell?

Which of these equations correctly represents the photosynthesis process?

Which of these is not a component in the hydrogen - oxygen fuel cell?

Which substance acts as the anode in the lead-acid automobile battery? ​ Pb + PbO2 + 4H+ + SO42 − → 2PbSO4 + 2H2O

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

Which of these pairs is correctly matched?

During oxidation-reduction reactions, the substance that loses electrons is _____and the substance that gains electrons is _____.

During respiration, glucose molecules are _____ in the presence of oxygen to produce carbon dioxide and water.

Which of these is/are not used as an antiseptic?

Which of these processes can occur at the anode in an electrochemical cell?

Which of these pairs represents the reactants in photosynthesis?

During respiration, glucose molecules are oxidized in the presence of _____to produce carbon dioxide and water.

Which of these occur(s) during oxidation? I. Gaining electrons II. Losing hydrogen III. Losing oxygen

Which of these is an antioxidant?

Which of these substances is not found in a common Leclanch é dry cell?

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

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 Online Only

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Which substance acts as the cathode in the lead-acid automobile battery? Pb + PbO₂ + 4H⁺ + SO₄^{2 −} → 2PbSO₄ + 2H₂O

Which substance acts as the anode in the lead-acid automobile battery? Pb + PbO₂ + 4H⁺ + SO₄^{2 −} → 2PbSO₄ + 2H₂O

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

During oxidation-reduction reactions, the substance that loses electrons is _and the substance that gains electrons is _.