Question 1

What is the anode in an alkaline battery?

Accepted Answer

A) MnO2 
B) KOH 
C) Zn powder 
D) Mn2O3 
E) Pt 
A) MnO2 
B) KOH 
C) Zn powder 
D) Mn2O3 
E) Pt

Question 2

When the cell potential is negative in a voltaic cell the cell reaction will not proceed spontaneously.

Accepted Answer

A) True 
 B)False

Question 3

Which element is oxidized in the reaction below? I-  + MnO4- + H+ → I2 + MnO2 + H2O

Accepted Answer

A) I 
B) Mn 
C) O 
D) H 
A) I 
B) Mn 
C) O 
D) H

Question 4

How many grams of Cu are obtained by passing a current of 12 A through a solution of CuSO4 for 30 minutes?

Accepted Answer

A) 0.016 
B) 7.1 
C) 14 
D) 28 
E) 3.6 
A) 0.016 
B) 7.1 
C) 14 
D) 28 
E) 3.6

Question 5

How many minutes will it take to plate out 4.56 g of Ni metal from a solution of Ni+2 using a current of 55.5 amps in an electrolytic cell?

Accepted Answer

A) 2.25 
B) 4.50 
C) 4.55 
D) 135 
E) 270 
A) 2.25 
B) 4.50 
C) 4.55 
D) 135 
E) 270

Question 6

Corrosion of iron is retarded by __________.

Accepted Answer

A) the presence of salts 
B) high pH conditions 
C) low pH conditions 
D) both the presence of salts and high pH conditions 
E) both the presence of salts and low pH conditions 
A) the presence of salts 
B) high pH conditions 
C) low pH conditions 
D) both the presence of salts and high pH conditions 
E) both the presence of salts and low pH conditions

Question 7

Calculate the number of grams of aluminum produced in 30.0 minutes by electrolysis of AlCl3 at a current of 12.0 A.

Accepted Answer

Question 8

What is the coefficient of the permanganate ion when the following equation is balanced? MnO4- + Br- → Mn2+ + Br2 (acidic solution)

Accepted Answer

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

Question 9

Which transformation could take place at the anode of an electrochemical cell?

Accepted Answer

A) NO → NO3- 
B) CO2 → Cr2O42- 
C) VO2+ → VO2+ 
D) H2AsO4 → H3AsO3 
E) O2 → H2O2 
A) NO → NO3- 
B) CO2 → Cr2O42- 
C) VO2+ → VO2+ 
D) H2AsO4 → H3AsO3 
E) O2 → H2O2

Question 10

The standard cell potential (E°cell)of the reaction below is +1.34 V. The value of ΔG° for the reaction is __________ kJ/mol. 3Cu (s)+ 2MnO4- (aq)+ 8H+ (aq)→ 3Cu2+ (aq)+ 2MnO2 (s)+ 4H2O (l)

Accepted Answer

A) -24.3 
B) +259 
C) -259 
D) +776 
E) none of the above 
A) -24.3 
B) +259 
C) -259 
D) +776 
E) none of the above

Question 11

Which substance is the oxidizing agent in the following reaction? Fe2S3 + 12HNO3 → 2Fe(NO3)3 + 3S + 6NO2 + 6H2O

Accepted Answer

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

Question 12

Consider an electrochemical cell based on the reaction: 2H+ (aq)+ Sn (s)→ Sn2+ (aq)+ H2 (g)
Which of the following actions would not change the measured cell potential?

Accepted Answer

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

Question 13

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

Accepted Answer

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

Question 14

The standard emf for the cell using the overall cell reaction below is +2.20 V: 2Al (s)+ 3I2 (s)→ 2Al3+ (aq)+ 6I- (aq)
The emf generated by the cell when [Al3+] = 4.5 × 10-3 M and [I-] = 0.15 M is ________ V.

Accepted Answer

A) 2.20 
B) 2.32 
C) 2.10 
D) 2.39 
E) 2.23 
A) 2.20 
B) 2.32 
C) 2.10 
D) 2.39 
E) 2.23

Question 15

What is the coefficient of Fe3+ when the following equation is balanced? CN- + Fe3+ → CNO- + Fe2+ (basic solution)

Accepted Answer

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

Question 16

The potential (E)to move K+ from the extracellular fluid to the intracellular fluid necessitates work. The sign for this potential is __________.

Accepted Answer

Question 17

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 18

__________ electrons appear in the following half-reaction when it is balanced. S4O62- → S2O32-

Accepted Answer

A) 6 
B) 2 
C) 4 
D) 1 
E) 3 
A) 6 
B) 2 
C) 4 
D) 1 
E) 3

Question 19

Which one of the following is the best oxidizing agent?

Accepted Answer

A) H2 
B) Na 
C) O2 
D) Li 
E) Ca 
A) H2 
B) Na 
C) O2 
D) Li 
E) Ca

Question 20

How many minutes will it take to plate out 2.19 g of chromium metal from a solution of Cr3+ using a current of 39.5 amps in an electrolyte cell?

Accepted Answer

A) 5.14 
B) 309 
C) 103 
D) 1.17 
E) 15.4 
A) 5.14 
B) 309 
C) 103 
D) 1.17 
E) 15.4

Exam 20: Electrochemistry

What is the anode in an alkaline battery?

When the cell potential is negative in a voltaic cell the cell reaction will not proceed spontaneously.

Which element is oxidized in the reaction below? I- + MnO4- + H+ → I2 + MnO2 + H2O

How many grams of Cu are obtained by passing a current of 12 A through a solution of CuSO4 for 30 minutes?

How many minutes will it take to plate out 4.56 g of Ni metal from a solution of Ni+2 using a current of 55.5 amps in an electrolytic cell?

Corrosion of iron is retarded by __________.

Calculate the number of grams of aluminum produced in 30.0 minutes by electrolysis of AlCl3 at a current of 12.0 A.

What is the coefficient of the permanganate ion when the following equation is balanced? MnO4- + Br- → Mn2+ + Br2 (acidic solution)

Which transformation could take place at the anode of an electrochemical cell?

The standard cell potential (E°cell)of the reaction below is +1.34 V. The value of ΔG° for the reaction is __________ kJ/mol. 3Cu (s)+ 2MnO4- (aq)+ 8H+ (aq)→ 3Cu2+ (aq)+ 2MnO2 (s)+ 4H2O (l)

Which substance is the oxidizing agent in the following reaction? Fe2S3 + 12HNO3 → 2Fe(NO3)3 + 3S + 6NO2 + 6H2O

Consider an electrochemical cell based on the reaction: 2H+ (aq)+ Sn (s)→ Sn2+ (aq)+ H2 (g) Which of the following actions would not change the measured cell potential?

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

The standard emf for the cell using the overall cell reaction below is +2.20 V: 2Al (s)+ 3I2 (s)→ 2Al3+ (aq)+ 6I- (aq) The emf generated by the cell when [Al3+] = 4.5 × 10-3 M and [I-] = 0.15 M is ________ V.

What is the coefficient of Fe3+ when the following equation is balanced? CN- + Fe3+ → CNO- + Fe2+ (basic solution)

The potential (E)to move K+ from the extracellular fluid to the intracellular fluid necessitates work. The sign for this potential is __________.

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

__________ electrons appear in the following half-reaction when it is balanced. S4O62- → S2O32-

Which one of the following is the best oxidizing agent?

How many minutes will it take to plate out 2.19 g of chromium metal from a solution of Cr3+ using a current of 39.5 amps in an electrolyte cell?

Introduction: Matter and Measurement

Atoms, Molecules, and Ions

Stoichiometry: Calculations With Chemical Formulas and Equations

Aqueous Reactions and Solution Stoichiometry

Thermochemistry

Electronic Structure of Atoms

Periodic Properties of the Elements

Basic Concepts of Chemical Bonding

Molecular Geometry and Bonding Theories

Gases

Liquids and Intermolecular Forces

Solids and Modern Materials

Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acid-Base Equilibria

Additional Aspects of Aqueous Equilibria

Chemistry of the Environment

Chemical Thermodynamics

Nuclear Chemistry

Chemistry of the Nonmetals

Transition Metals and Coordination Chemistry

The Chemistry of Life: Organic and Biological Chemistry

Filters

Which element is oxidized in the reaction below? I^- + MnO₄^- + H⁺ → I₂ + MnO₂ + H₂O

How many grams of Cu are obtained by passing a current of 12 A through a solution of CuSO₄ for 30 minutes?

How many minutes will it take to plate out 4.56 g of Ni metal from a solution of Ni⁺² using a current of 55.5 amps in an electrolytic cell?

Calculate the number of grams of aluminum produced in 30.0 minutes by electrolysis of AlCl₃ at a current of 12.0 A.

What is the coefficient of the permanganate ion when the following equation is balanced? MnO₄^- + Br^- → Mn²⁺ + Br₂ (acidic solution)

The standard cell potential (E°_cell)of the reaction below is +1.34 V. The value of ΔG° for the reaction is __________ kJ/mol. 3Cu (s)+ 2MnO₄^- (aq)+ 8H⁺ (aq)→ 3Cu²⁺ (aq)+ 2MnO₂ (s)+ 4H₂O (l)

Which substance is the oxidizing agent in the following reaction? Fe₂S₃ + 12HNO₃ → 2Fe(NO₃)₃ + 3S + 6NO₂ + 6H₂O

Consider an electrochemical cell based on the reaction: 2H⁺ (aq)+ Sn (s)→ Sn²⁺ (aq)+ H₂ (g) Which of the following actions would not change the measured cell potential?

The standard emf for the cell using the overall cell reaction below is +2.20 V: 2Al (s)+ 3I₂ (s)→ 2Al³⁺ (aq)+ 6I^- (aq) The emf generated by the cell when [Al³⁺] = 4.5 × 10^-3 M and [I^-] = 0.15 M is ________ V.

What is the coefficient of Fe³⁺ when the following equation is balanced? CN^- + Fe³⁺ → CNO^- + Fe²⁺ (basic solution)

The potential (E)to move K⁺ from the extracellular fluid to the intracellular fluid necessitates work. The sign for this potential is __________.

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

__________ electrons appear in the following half-reaction when it is balanced. S₄O₆^2- → S₂O₃^2-

How many minutes will it take to plate out 2.19 g of chromium metal from a solution of Cr³⁺ using a current of 39.5 amps in an electrolyte cell?