Question 1

Which statement about an electrochemical cell is incorrect ?

Accepted Answer

A) Reduction occurs at the anode. 
B) The salt bridge is made from a porous material. 
C) The electrode which acts as the anode carries a negative charge. 
D) The current in the external wire always flows from anode to cathode. 
E) Any spontaneous reaction can serve as a source of energy in a battery. 
A) Reduction occurs at the anode. 
B) The salt bridge is made from a porous material. 
C) The electrode which acts as the anode carries a negative charge. 
D) The current in the external wire always flows from anode to cathode. 
E) Any spontaneous reaction can serve as a source of energy in a battery. A

Question 2

Which of these is a possible anodic 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) A

Question 3

Which of these is not used as a topical 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 D

Question 4

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

Question 5

Which of these substances is not found in a common Leclanche 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 6

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

Accepted Answer

A) Longer shelf life 
B) Longer battery life 
C) More inexpensive 
D) Less subject to corrosion 
E) All of these are advantages of the alkaline battery over the Leclanche dry cell. 
A) Longer shelf life 
B) Longer battery life 
C) More inexpensive 
D) Less subject to corrosion 
E) All of these are advantages of the alkaline battery over the Leclanche dry cell.

Question 7

Which of these processes could 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 8

Which of these are the primary components in an automobile battery?

Accepted Answer

A) Lead and water 
B) Copper and lead 
C) Copper and zinc 
D) Lead and sulfuric acid 
E) Copper and sulfuric acid 
A) Lead and water 
B) Copper and lead 
C) Copper and zinc 
D) Lead and sulfuric acid 
E) Copper and sulfuric acid

Question 9

Redox reactions involve the transfer of _______.

Accepted Answer

A) hydrogen 
B) oxygen 
C) protons 
D) electrons 
A) hydrogen 
B) oxygen 
C) protons 
D) electrons

Question 10

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 11

Which of these is an antioxidant?

Accepted Answer

A) vitamin E 
B) vitamin C 
C) beta carotene 
D) all of the above 
E) none of the above 
A) vitamin E 
B) vitamin C 
C) beta carotene 
D) all of the above 
E) none of the above

Question 12

Which of these are oxidation-reduction reactions?
I. PCl3 + 3H2O → 3HCl + H3PO3
II. Fe2O3 + 3CO → 2Fe + 3CO2
III. CaCO3 + HClO3 → Ca(ClO3)2 + CO2 + H2O

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 13

During respiration sugars 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 14

Which of these processes could 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 15

Which of these substances is oxidized?
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 16

Atoms or molecules with unpaired electrons are called:

Accepted Answer

A) Inert 
B) radiation 
C) oxidizers 
D) free radicals 
E) antioxidants 
A) Inert 
B) radiation 
C) oxidizers 
D) free radicals 
E) antioxidants

Question 17

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

Accepted Answer

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

Question 18

Which of these is not 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 19

Which of these pairs represent the products of respiration?

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 20

Rust formation is accelerated in the presence of salt water because ________

Accepted Answer

A) oxygen is easily transported in water. 
B) the water traps the oxygen at the surface of the metal. 
C) the salt water conducts electricity. 
D) chloride ions also oxidize the surface of the metal. 
A) oxygen is easily transported in water. 
B) the water traps the oxygen at the surface of the metal. 
C) the salt water conducts electricity. 
D) chloride ions also oxidize the surface of the metal.

Which statement about an electrochemical cell is incorrect ?

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

Which of these is not used as a topical antiseptic?

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

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

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

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

Which of these are the primary components in an automobile battery?

Redox reactions involve the transfer of _______.

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

Which of these is an antioxidant?

Which of these are oxidation-reduction reactions? I. PCl₃ + 3H₂O → 3HCl + H₃PO₃ II. Fe₂O₃ + 3CO → 2Fe + 3CO₂ III. CaCO₃ + HClO₃ → Ca(ClO₃)₂ + CO₂ + H₂O

During respiration sugars are oxidized in the presence of ____ to produce carbon dioxide and water.

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

Which of these substances is oxidized? Fe₂O₃ + 3CO → 2Fe + CO₂

Atoms or molecules with unpaired electrons are called:

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

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

Which of these pairs represent the products of respiration?

Rust formation is accelerated in the presence of salt water because ________

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Exam 14: Oxidation and Reduction

Which statement about an electrochemical cell is incorrect ?

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

Which of these is not used as a topical antiseptic?

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

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

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

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

Which of these are the primary components in an automobile battery?

Redox reactions involve the transfer of _______.

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

Which of these is an antioxidant?

Which of these are oxidation-reduction reactions? I. PCl3 + 3H2O → 3HCl + H3PO3 II. Fe2O3 + 3CO → 2Fe + 3CO2 III. CaCO3 + HClO3 → Ca(ClO3)2 + CO2 + H2O

During respiration sugars are oxidized in the presence of ____ to produce carbon dioxide and water.

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

Which of these substances is oxidized? Fe2O3 + 3CO → 2Fe + CO2

Atoms or molecules with unpaired electrons are called:

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

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

Which of these pairs represent the products of respiration?

Rust formation is accelerated in the presence of salt water because ________

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

Filters

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

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

Which of these are oxidation-reduction reactions? I. PCl₃ + 3H₂O → 3HCl + H₃PO₃ II. Fe₂O₃ + 3CO → 2Fe + 3CO₂ III. CaCO₃ + HClO₃ → Ca(ClO₃)₂ + CO₂ + H₂O

Which of these substances is oxidized? Fe₂O₃ + 3CO → 2Fe + CO₂