Question 1

In the formula ΔG = - nFE , F is the _.

Accepted Answer

Faraday constant or

Question 2

The standard cell potential (E°cell) for the reaction below is +0.63 V. The cell potential for this reaction is V when [ Zn2+] = 1.0 M and [Pb2+] = 2.0 × 10- 4 M.

Accepted Answer

A)  0.74 
B)  0.85 
C)  0.52 
D)  0.63 
E)  0.41 
A)  0.74 
B)  0.85 
C)  0.52 
D)  0.63 
E)  0.41

Question 3

Calculate the number of grams of aluminum produced in 30 minutes by electrolysis of AlCl3 at a current of 12 A.

Accepted Answer

Question 4

The quantity of charge passing a point in a circuit in one second when the current is one ampere is called a .

Accepted Answer

The answer of The quantity of charge passing a point...

Question 5

Cathodic protection of a metal pipe against corrosion usually entails

Accepted Answer

A)  attaching an active metal to make the pipe the anode in an electrochemical cell. 
B)  coating the pipe with a fluoropolymer to act as a source of fluoride ion (since the latter is so hard to oxidize) 
C)  coating the pipe with another metal whose standard reduction potential is less negative than that of the pipe. 
D)  attaching a dry cell to reduce any metal ions which might be formed. 
E)  attaching an active metal to make the pipe the cathode in an electrochemical cell. 
A)  attaching an active metal to make the pipe the anode in an electrochemical cell. 
B)  coating the pipe with a fluoropolymer to act as a source of fluoride ion (since the latter is so hard to oxidize) 
C)  coating the pipe with another metal whose standard reduction potential is less negative than that of the pipe. 
D)  attaching a dry cell to reduce any metal ions which might be formed. 
E)  attaching an active metal to make the pipe the cathode in an electrochemical cell.

Question 6

Which substance is the reducing agent in the reaction below?

Accepted Answer

A)  PbSO4  
B)  Pb 
C)  H2SO4  
D)  PbO2  
E)  H2O 
A)  PbSO4  
B)  Pb 
C)  H2SO4  
D)  PbO2  
E)  H2O

Question 7

The standard cell potential (E°cell) for the voltaic cell based on the reaction below is V.

Accepted Answer

A)  +0.30 
B)  +3.10 
C)  +2.80 
D)  - 0.16 
E)  +0.83 
A)  +0.30 
B)  +3.10 
C)  +2.80 
D)  - 0.16 
E)  +0.83

Question 8

Consider an electrochemical cell based on the reaction:
 
Which of the following actions would not change the measured cell potential?

Accepted Answer

A)  lowering the pH in the cathode compartment 
B)  increasing the pressure of hydrogen gas in the cathode compartment 
C)  addition of more tin metal to the anode compartment 
D)  increasing the tin (II) ion concentration in the anode compartment 
E)  Any of the above will change the measured cell potential. 
A)  lowering the pH in the cathode compartment 
B)  increasing the pressure of hydrogen gas in the cathode compartment 
C)  addition of more tin metal to the anode compartment 
D)  increasing the tin (II) ion concentration in the anode compartment 
E)  Any of the above will change the measured cell potential.

Question 9

Which of the following reactions will occur spontaneously as written?

Accepted Answer

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

Question 10

The reduction half reaction occurring in the standard hydrogen electrode is _.

Accepted Answer

A)  2H+ (aq, 1M) + 2e-  -H2 (g, 1 atm) 
B)  2H+ (aq, 1M) + Cl2 (aq) - 2HCl (aq) 
C)  H2 (g, 1 atm) - 2H+ (aq, 1M) + 2e- 
D)  2H+ (aq) + 2OH-  -H2O (l) 
E)  O2 (g) + 4H+ (aq) + 4e- - 2H2O (l) 
A)  2H+ (aq, 1M) + 2e-  -H2 (g, 1 atm) 
B)  2H+ (aq, 1M) + Cl2 (aq) - 2HCl (aq) 
C)  H2 (g, 1 atm) - 2H+ (aq, 1M) + 2e- 
D)  2H+ (aq) + 2OH-  -H2O (l) 
E)  O2 (g) + 4H+ (aq) + 4e- - 2H2O (l)

Question 11

The standard cell potential (E°cell) for the voltaic cell based on the reaction below is V. Sn2+ (aq) + 2Fe3+ (aq) - 2Fe2+ (aq) + Sn4+ (aq)

Accepted Answer

A)  +1.39 
B)  +1.21 
C)  - 0.46 
D)  +0.46 
E)  +0.617 
A)  +1.39 
B)  +1.21 
C)  - 0.46 
D)  +0.46 
E)  +0.617

Question 12

The lithium ion battery has more energy per unit mass than nickel- cadmiun batteries.

Accepted Answer

A) True 
 B)False

Question 13

The electode where reduction occurs is called the anode.

Accepted Answer

A) True 
 B)False

Question 14

A voltaic cell is constructed with two Zn2+- Zn electrodes, where the half- reaction is   The concentrations of zinc ion in the two compartments are 5.50 M and 1.11 × 10- 2 M, respectively.
The cell emf is V.

Accepted Answer

A)  - 378 
B)  - 0.761 
C)  0.160 
D)  - 1.54 × 10- 3 
E)  0.0798 
A)  - 378 
B)  - 0.761 
C)  0.160 
D)  - 1.54 × 10- 3 
E)  0.0798

Question 15

The dependence of cell emf on concentration is expressed in the .

Accepted Answer

The answer of The dependence of cell emf on concentration...

Question 16

The gain of electrons by an element is called .

Accepted Answer

A)  oxidation 
B)  reduction 
C)  disproportionation 
D)  sublimation 
E)  fractionation 
A)  oxidation 
B)  reduction 
C)  disproportionation 
D)  sublimation 
E)  fractionation

Question 17

A positive number for maximum useful work in a spontaneous process (voltaic cell) indicates that the cell will perform work on its surroundings.

Accepted Answer

A) True 
 B)False

Question 18

Which substance is the reducing agent in the following reaction?

Accepted Answer

A)  NO2  
B)  Fe2S3  
C)  H2O 
D)  S 
E)  HNO3 
A)  NO2  
B)  Fe2S3  
C)  H2O 
D)  S 
E)  HNO3

Question 19

In the equation 2H2 (g) + O2 (g) -2H2O (l), hydrogen gives up electrons and is a reductant.

Accepted Answer

A) True 
 B)False

Question 20

Which element is oxidized in the reaction below?

Accepted Answer

A)  I 
B)  H 
C)  O 
D)  C 
E)  Fe 
A)  I 
B)  H 
C)  O 
D)  C 
E)  Fe

Exam 20: Electrochemistry

In the formula ΔG = - nFE , F is the _.

The standard cell potential (E°cell) for the reaction below is +0.63 V. The cell potential for this reaction is V when [ Zn2+] = 1.0 M and [Pb2+] = 2.0 × 10- 4 M.

Calculate the number of grams of aluminum produced in 30 minutes by electrolysis of AlCl3 at a current of 12 A.

The quantity of charge passing a point in a circuit in one second when the current is one ampere is called a .

Cathodic protection of a metal pipe against corrosion usually entails

Which substance is the reducing agent in the reaction below?

The standard cell potential (E°cell) for the voltaic cell based on the reaction below is V.

Consider an electrochemical cell based on the reaction: Which of the following actions would not change the measured cell potential?

Which of the following reactions will occur spontaneously as written?

The reduction half reaction occurring in the standard hydrogen electrode is _.

The standard cell potential (E°cell) for the voltaic cell based on the reaction below is V. Sn2+ (aq) + 2Fe3+ (aq) - 2Fe2+ (aq) + Sn4+ (aq)

The lithium ion battery has more energy per unit mass than nickel- cadmiun batteries.

The electode where reduction occurs is called the anode.

A voltaic cell is constructed with two Zn2+- Zn electrodes, where the half- reaction is The concentrations of zinc ion in the two compartments are 5.50 M and 1.11 × 10- 2 M, respectively. The cell emf is V.

The dependence of cell emf on concentration is expressed in the .

The gain of electrons by an element is called .

A positive number for maximum useful work in a spontaneous process (voltaic cell) indicates that the cell will perform work on its surroundings.

Which substance is the reducing agent in the following reaction?

In the equation 2H2 (g) + O2 (g) -2H2O (l), hydrogen gives up electrons and is a reductant.

Which element is oxidized in the reaction below?

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

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The standard cell potential (E°_cell) for the reaction below is +0.63 V. The cell potential for this reaction is V when [ Zn²⁺] = 1.0 M and [Pb²⁺] = 2.0 × 10^-⁴M.

Calculate the number of grams of aluminum produced in 30 minutes by electrolysis of AlCl₃at a current of 12 A.

The standard cell potential (E°_cell) for the voltaic cell based on the reaction below is V.

The standard cell potential (E°_cell) for the voltaic cell based on the reaction below is V. Sn²⁺(aq) + 2Fe³⁺(aq) - 2Fe²⁺(aq) + Sn⁴⁺(aq)

A voltaic cell is constructed with two Zn²⁺- Zn electrodes, where the half- reaction is The concentrations of zinc ion in the two compartments are 5.50 M and 1.11 × 10^-²M, respectively. The cell emf is V.

In the equation 2H₂(g) + O₂(g) -2H₂O (l), hydrogen gives up electrons and is a reductant.