Question 1

The best sources of antioxidants are _____.

Accepted Answer

A)  fish and meat 
B)  fruits and vegetables 
C)  milk and honey 
D)  bread and butter 
E)  cereals and pulses 
A)  fish and meat 
B)  fruits and vegetables 
C)  milk and honey 
D)  bread and butter 
E)  cereals and pulses

Question 2

Which of these is correctly associated with the anode?
I. Electrode with negative charges
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 3

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 4

Which of these occur(s) during 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 5

Which of these is a redox process?
I. Rusting of iron
II. Respiration
III. Burning hydrocarbons

Accepted Answer

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

Question 6

Which of these is not an oxidation-reduction reaction?

Accepted Answer

A)  CuO(s) + H2(g) → Cu(s) + H2O(l) 
B)  CO2(g) + H2(g) → CO(g) + H2O(l) 
C)  I − (aq) + NO3 −  (aq) → NO(g) + I 2 (s) 
D)  Mn(OH)2(s) + MnO4 −  (aq) → MnO42 −  (aq) 
E)  HCl(aq) + NaOH(aq) → NaCl(aq) + H2O (l) 
A)  CuO(s) + H2(g) → Cu(s) + H2O(l) 
B)  CO2(g) + H2(g) → CO(g) + H2O(l) 
C)  I − (aq) + NO3 −  (aq) → NO(g) + I 2 (s) 
D)  Mn(OH)2(s) + MnO4 −  (aq) → MnO42 −  (aq) 
E)  HCl(aq) + NaOH(aq) → NaCl(aq) + H2O (l)

Question 7

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 8

Which  of the following  statements about the lead-acid battery is incorrect?
​
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)  Porous lead plates act as the cathode. 
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)  Porous lead plates act as the cathode.

Question 9

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 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 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 that 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 that 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.

The best sources of antioxidants are _____.

Which of these is correctly associated with the anode? I. Electrode with negative charges II. Electrode at which a substance loses electrons III. Electrode at which reduction occurs

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

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

Which of these is a redox process? I. Rusting of iron II. Respiration III. Burning hydrocarbons

Which of these is not an oxidation-reduction reaction?

Which of these substances is the most common reducing agent?

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

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

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

Which statement about an electrochemical cell is incorrect ?

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Exam 14: Oxidation and Reduction

The best sources of antioxidants are _____.

Which of these is correctly associated with the anode? I. Electrode with negative charges II. Electrode at which a substance loses electrons III. Electrode at which reduction occurs

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

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

Which of these is a redox process? I. Rusting of iron II. Respiration III. Burning hydrocarbons

Which of these is not an oxidation-reduction reaction?

Which of these substances is the most common reducing agent?

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

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

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

Which statement about an electrochemical cell is incorrect ?

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

Filters

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

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