Question 1

Which of the following reactions is a redox reaction?
a. K2CrO4 + BaCl2 - BaCrO4 + 2KCl
b. Pb22+ + 2Br- - PbBr
c. Cu + S - CuS

Accepted Answer

A)  (a) only 
B)  (b) only 
C)  (c) only 
D)  (a) and (c) 
E)  (b) and (c) 
A)  (a) only 
B)  (b) only 
C)  (c) only 
D)  (a) and (c) 
E)  (b) and (c)

Question 2

What is the coefficient of Fe3+ when the following equation is balanced?

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  5 
A)  1 
B)  2 
C)  3 
D)  4 
E)  5

Question 3

The standard cell potential (E°cell) for the reaction below is +1.10 V. The cell potential for this reaction is V when the concentration of [Cu2+] = 1.0 × 10- 5 M and [Zn2+] = 1.0 M.

Accepted Answer

A)  1.25 
B)  0.95 
C)  1.10 
D)  0.80 
E)  1.40 
A)  1.25 
B)  0.95 
C)  1.10 
D)  0.80 
E)  1.40

Question 4

Which of the following reactions will occur spontaneously as written?

Accepted Answer

A)  3Fe (s) + 2Cr3+ (aq) -2Cr (s) + 3Fe2+ (aq) 
B)  3Sn4+ (aq) + 2Cr (s) -2Cr3+ (aq) + 3Sn2+ (aq) 
C)  Sn4+ (aq) + Fe2+ (aq) -Sn2+ (aq) + Fe (s) 
D)  3Fe2+ (aq) -Fe (s) + 2Fe3+ (aq) 
E)  Sn4+ (aq) + Fe3+ (aq) -Sn2+ (aq) + Fe2+ (aq) 
A)  3Fe (s) + 2Cr3+ (aq) -2Cr (s) + 3Fe2+ (aq) 
B)  3Sn4+ (aq) + 2Cr (s) -2Cr3+ (aq) + 3Sn2+ (aq) 
C)  Sn4+ (aq) + Fe2+ (aq) -Sn2+ (aq) + Fe (s) 
D)  3Fe2+ (aq) -Fe (s) + 2Fe3+ (aq) 
E)  Sn4+ (aq) + Fe3+ (aq) -Sn2+ (aq) + Fe2+ (aq)

Question 5

What is the oxidation number of potassium in KMnO4?

Accepted Answer

A)  +2 
B)  +1 
C)  - 1 
D)  +3 
E)  0 
A)  +2 
B)  +1 
C)  - 1 
D)  +3 
E)  0

Question 6

The relationship between the change in Gibbs free energy and the emf of an electrochemical cell is given by .

Accepted Answer

A)  ΔG = - nF
ERT 
B)  ΔG = - nF
E 
C)  ΔG = - nFE 
D)  ΔG = - nRTF 
E)  ΔG = - E
NF 
A)  ΔG = - nF
ERT 
B)  ΔG = - nF
E 
C)  ΔG = - nFE 
D)  ΔG = - nRTF 
E)  ΔG = - E
NF

Question 7

The standard emf for the cell using the overall cell reaction below is +0.48 V:
 
The emf generated by the cell when [Ni2+] = 2.50 M and [Zn2+] = 0.100 M is V.

Accepted Answer

A)  0.40 
B)  0.50 
C)  0.52 
D)  0.44 
E)  0.56 
A)  0.40 
B)  0.50 
C)  0.52 
D)  0.44 
E)  0.56

Question 8

The major product of a hydrogen fuel cell is .

Accepted Answer

The answer of The major product of a hydrogen fuel...

Question 9

The standard reduction potential, E o
   
, is proportional to the stoichiometric coefficient.

Accepted Answer

A) True 
 B)False

Question 10

The balanced half- reaction in which dichromate ion is reduced to chromium metal is a process.

Accepted Answer

A)  two- electron 
B)  four- electron 
C)  three- electron 
D)  six- electron 
E)  twelve- electron 
A)  two- electron 
B)  four- electron 
C)  three- electron 
D)  six- electron 
E)  twelve- electron

Which of the following reactions is a redox reaction? a. K₂CrO₄+ BaCl₂- BaCrO₄+ 2KCl b. Pb₂²⁺+ 2Br^-- PbBr c. Cu + S - CuS

What is the coefficient of Fe³⁺when the following equation is balanced?

The standard cell potential (E°_cell) for the reaction below is +1.10 V. The cell potential for this reaction is V when the concentration of [Cu²⁺] = 1.0 × 10^-⁵M and [Zn²⁺] = 1.0 M.

Which of the following reactions will occur spontaneously as written?

What is the oxidation number of potassium in KMnO₄?

The relationship between the change in Gibbs free energy and the emf of an electrochemical cell is given by .

The standard emf for the cell using the overall cell reaction below is +0.48 V: The emf generated by the cell when [Ni²⁺] = 2.50 M and [Zn²⁺] = 0.100 M is V.

The major product of a hydrogen fuel cell is .

The standard reduction potential, E ^o , is proportional to the stoichiometric coefficient.

The balanced half- reaction in which dichromate ion is reduced to chromium metal is a process.

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Gases

Intermolecular Forces, Liquids, and Solids

Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Nuclear Chemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Chemistry of Coordination Compounds

The Chemistry of Life: Organic and Biological Chemistry

Filters

Exam 20: Electrochemistry

Which of the following reactions is a redox reaction? a. K2CrO4 + BaCl2 - BaCrO4 + 2KCl b. Pb22+ + 2Br- - PbBr c. Cu + S - CuS

What is the coefficient of Fe3+ when the following equation is balanced?

The standard cell potential (E°cell) for the reaction below is +1.10 V. The cell potential for this reaction is V when the concentration of [Cu2+] = 1.0 × 10- 5 M and [Zn2+] = 1.0 M.

Which of the following reactions will occur spontaneously as written?

What is the oxidation number of potassium in KMnO4?

The relationship between the change in Gibbs free energy and the emf of an electrochemical cell is given by .

The standard emf for the cell using the overall cell reaction below is +0.48 V: The emf generated by the cell when [Ni2+] = 2.50 M and [Zn2+] = 0.100 M is V.

The major product of a hydrogen fuel cell is .

The standard reduction potential, E o , is proportional to the stoichiometric coefficient.

The balanced half- reaction in which dichromate ion is reduced to chromium metal is a process.

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Gases

Intermolecular Forces, Liquids, and Solids

Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Nuclear Chemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Chemistry of Coordination Compounds

The Chemistry of Life: Organic and Biological Chemistry

Filters

Which of the following reactions is a redox reaction? a. K₂CrO₄+ BaCl₂- BaCrO₄+ 2KCl b. Pb₂²⁺+ 2Br^-- PbBr c. Cu + S - CuS

What is the coefficient of Fe³⁺when the following equation is balanced?

The standard cell potential (E°_cell) for the reaction below is +1.10 V. The cell potential for this reaction is V when the concentration of [Cu²⁺] = 1.0 × 10^-⁵M and [Zn²⁺] = 1.0 M.

What is the oxidation number of potassium in KMnO₄?

The standard emf for the cell using the overall cell reaction below is +0.48 V: The emf generated by the cell when [Ni²⁺] = 2.50 M and [Zn²⁺] = 0.100 M is V.

The standard reduction potential, E ^o , is proportional to the stoichiometric coefficient.