Question 1

What element is being reduced in the following (unbalanced)redox reaction? H2O2(l)+ ClO2(aq)→ ClO2⁻(aq)+ O2(g)

Accepted Answer

A) H 
B) O 
C) Cl 
D) N 
E) C 
A) H 
B) O 
C) Cl 
D) N 
E) C

Question 2

What is the reducing agent in the redox reaction represented by the following cell notation? Sn(s)∣ Sn2+(aq)   Ag+(aq)∣ Ag(s)

Accepted Answer

A) Sn(s) 
B) Ag+(aq) 
C) Sn2+(aq) 
D) Ag(s) 
E) Pt(s) 
A) Sn(s) 
B) Ag+(aq) 
C) Sn2+(aq) 
D) Ag(s) 
E) Pt(s)

Question 3

Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25 °C. (The equation is balanced.) 2K(s)+ I2(s)→ 2K⁺(aq)+ 2I⁻(aq)
K+(aq)+ e⁻ → K (s) E° = -2.93 V
I2(s)+ 2 e⁻ → 2 I⁻(aq) E° = +0.54 V

Accepted Answer

A) +6.40 V 
B) +1.85 V 
C) -5.32 V 
D) +3.47 V 
E) +5.32 V 
A) +6.40 V 
B) +1.85 V 
C) -5.32 V 
D) +3.47 V 
E) +5.32 V

Question 4

How many electrons are transferred in the following reaction? (The reaction is unbalanced.) Mg(s)+ Al3+(aq)→ Al(s)+ Mg2+(aq)

Accepted Answer

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

Question 5

Identify the components of a fuel cell.

Accepted Answer

A) nickel-metal hydride 
B) lithium-ion 
C) hydrogen-oxygen 
D) nickel-cadmium 
E) zinc-manganese 
A) nickel-metal hydride 
B) lithium-ion 
C) hydrogen-oxygen 
D) nickel-cadmium 
E) zinc-manganese

Question 6

Given that E°red = -0.40 V for Cd2+/Cd at 25 °C, find E° and E for the concentration cell expressed using shorthand notation below: Cd(s)∣ Cd2+(1.0 × 10-5 mol L-1)∣∣ Cd2+(0.100 mol L-1)∣ Cd(s)

Accepted Answer

A) E° = 0.00 V and E = +0.24 V 
B) E° = 0.00 V and E = +0.0789 V 
C) E° = -0.40 V and E = -0.16 V 
D) E° = -0.40 V and E = -0.28 V 
A) E° = 0.00 V and E = +0.24 V 
B) E° = 0.00 V and E = +0.0789 V 
C) E° = -0.40 V and E = -0.16 V 
D) E° = -0.40 V and E = -0.28 V

Question 7

What is the balanced chemical equation for the galvanic cell reaction expressed using shorthand notation below? Al(s)∣ Al3+(aq)∣∣ Fe2+(aq)∣ Fe(s)

Accepted Answer

A) 2Al(s)+ 3Fe2+(aq)→ 2Al3+(aq)+ 3Fe(s) 
B) 3Al(s)+ 2Fe2+(aq)→ 3Al3+(aq)+ 2Fe(s) 
C) 2Fe(s)+ 3Al3+(aq)→ 2Fe2+(aq)+ 3Al(s) 
D) 3Fe(s)+ 2Al3+(aq)→ 3Fe2+(aq)+ 2Al(s) 
A) 2Al(s)+ 3Fe2+(aq)→ 2Al3+(aq)+ 3Fe(s) 
B) 3Al(s)+ 2Fe2+(aq)→ 3Al3+(aq)+ 2Fe(s) 
C) 2Fe(s)+ 3Al3+(aq)→ 2Fe2+(aq)+ 3Al(s) 
D) 3Fe(s)+ 2Al3+(aq)→ 3Fe2+(aq)+ 2Al(s)

Question 8

Identify the battery type that has a high overcharge tolerance.

Accepted Answer

A) NiCad battery 
B) lithium-ion battery 
C) nickel-metal hydride battery 
D) lead-acid storage battery 
E) zinc-manganese battery 
A) NiCad battery 
B) lithium-ion battery 
C) nickel-metal hydride battery 
D) lead-acid storage battery 
E) zinc-manganese battery

Question 9

Which of the following is the strongest oxidizing agent?

Accepted Answer

A) H2O2(aq) 
B) Fe3+(aq) 
C) ClO2(g) 
D) I2(s) 
E) Fe(s) 
A) H2O2(aq) 
B) Fe3+(aq) 
C) ClO2(g) 
D) I2(s) 
E) Fe(s)

Question 10

What element is being oxidized in the following (unbalanced)redox reaction? H2O2(l)+ ClO2(aq)→ ClO2⁻(aq)+ O2(g)

Accepted Answer

A) H 
B) O 
C) Cl 
D) N 
E) C 
A) H 
B) O 
C) Cl 
D) N 
E) C

Question 11

Which of the following is the weakest reducing agent?

Accepted Answer

A) Al(s) 
B) Zn(s) 
C) Mg(s) 
D) Al3+(aq) 
E) Mg2+(aq) 
A) Al(s) 
B) Zn(s) 
C) Mg(s) 
D) Al3+(aq) 
E) Mg2+(aq)

Question 12

How many grams of nickel metal are plated out when a constant current of 15.0 A is passed through aqueous NiCl2 for 60.0 minutes?

Accepted Answer

A) 10.9 g 
B) 16.4 g 
C) 32.8 g 
D) 36.3 g 
A) 10.9 g 
B) 16.4 g 
C) 32.8 g 
D) 36.3 g

Question 13

Identify the location of reduction in an electrochemical cell.

Accepted Answer

A) the anode 
B) the cathode 
C) the electrode 
D) the salt bridge 
E) the socket 
A) the anode 
B) the cathode 
C) the electrode 
D) the salt bridge 
E) the socket

Question 14

Consider the galvanic cell,   Which one of the following changes to the cell would cause the cell potential to increase (i.e., become more positive)?

Accepted Answer

A) increase the [Zn2+] concentration 
B) increase the [Pb2+] concentration 
C) increase the mass of Zn(s) 
D) decrease the mass of Zn(s) 
A) increase the [Zn2+] concentration 
B) increase the [Pb2+] concentration 
C) increase the mass of Zn(s) 
D) decrease the mass of Zn(s)

Question 15

Define a salt bridge.

Accepted Answer

A) A pathway, composed of salt water, that ions pass through. 
B) A pathway in which no ions flow. 
C) A pathway between the cathode and anode in which ions are reduced. 
D) A pathway between the cathode and anode in which ions are oxidized. 
E) A pathway through which counterions can flow between the half-cells without the solutions in the half-cell totally mixing. 
A) A pathway, composed of salt water, that ions pass through. 
B) A pathway in which no ions flow. 
C) A pathway between the cathode and anode in which ions are reduced. 
D) A pathway between the cathode and anode in which ions are oxidized. 
E) A pathway through which counterions can flow between the half-cells without the solutions in the half-cell totally mixing.

Question 16

What is the shorthand notation that represents the following galvanic cell reaction? Pb(s)+ Cu(NO3)2(aq)→ Pb(NO3)2(aq)+ Cu(s)

Accepted Answer

A) Pb(s)∣ Pb2+(aq)∣∣ Cu2+(aq)∣ Cu(s) 
B) Cu(s)∣ Cu2+(aq)∣∣ Pb2+(aq)∣ Pb(s) 
C) Pb(s)∣ NO3-(aq)∣∣ NO3-(aq)∣ Cu(s) 
D) Cu(s)∣ Cu(NO3)2(aq)∣∣ Pb(NO3)2(aq)∣ Pb(s) 
A) Pb(s)∣ Pb2+(aq)∣∣ Cu2+(aq)∣ Cu(s) 
B) Cu(s)∣ Cu2+(aq)∣∣ Pb2+(aq)∣ Pb(s) 
C) Pb(s)∣ NO3-(aq)∣∣ NO3-(aq)∣ Cu(s) 
D) Cu(s)∣ Cu(NO3)2(aq)∣∣ Pb(NO3)2(aq)∣ Pb(s)

Question 17

What is the reducing agent in the redox reaction represented by the following cell notation? Ni(s)∣ Ni2+(aq)   Ag+(aq)∣ Ag(s)

Accepted Answer

A) Ni(s) 
B) Ni2+(aq) 
C) Ag+(aq) 
D) Ag(s) 
E) Pt(s) 
A) Ni(s) 
B) Ni2+(aq) 
C) Ag+(aq) 
D) Ag(s) 
E) Pt(s)

Question 18

Identify the location of oxidation in an electrochemical cell.

Accepted Answer

A) the anode 
B) the cathode 
C) the electrode 
D) the salt bridge 
E) the socket 
A) the anode 
B) the cathode 
C) the electrode 
D) the salt bridge 
E) the socket

Question 19

Determine the redox reaction represented by the following cell notation: Mg(s)∣ Mg2+(aq)   Cu2+(aq)∣ Cu(s)

Accepted Answer

A) Cu(s)+ Mg2+(aq)→ Mg(s)+ Cu2+(aq) 
B) Mg(s)+ Cu2+(aq)→ Cu(s)+ Mg2+(aq) 
C) 2Mg(s)+ Cu2+(aq)→ Cu(s)+ 2Mg2+(aq) 
D) 2Cu(s)+ Mg2+(aq)→ Mg(s)+ 2Cu2+(aq) 
E) 3Mg(s)+ 2Cu2+(aq)→ 2Cu(s)+ 3Mg2+(aq) 
A) Cu(s)+ Mg2+(aq)→ Mg(s)+ Cu2+(aq) 
B) Mg(s)+ Cu2+(aq)→ Cu(s)+ Mg2+(aq) 
C) 2Mg(s)+ Cu2+(aq)→ Cu(s)+ 2Mg2+(aq) 
D) 2Cu(s)+ Mg2+(aq)→ Mg(s)+ 2Cu2+(aq) 
E) 3Mg(s)+ 2Cu2+(aq)→ 2Cu(s)+ 3Mg2+(aq)

Question 20

Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25 °C. (The equation is balanced.) Sn(s)+ 2Ag⁺(aq)→ Sn2+(aq)+ 2Ag(s)
Sn2+(aq)+ 2 e⁻ → Sn(s) E° = -0.14 V
Ag⁺(aq)+ e⁻ → Ag(s) E° = +0.80 V

Accepted Answer

A) +1.74 V 
B) +0.94 V 
C) +1.08 V 
D) -1.08 V 
E) -1.74 V 
A) +1.74 V 
B) +0.94 V 
C) +1.08 V 
D) -1.08 V 
E) -1.74 V

Exam 18: Electrochemistry

What element is being reduced in the following (unbalanced)redox reaction? H2O2(l)+ ClO2(aq)→ ClO2⁻(aq)+ O2(g)

What is the reducing agent in the redox reaction represented by the following cell notation? Sn(s)∣ Sn2+(aq) Ag+(aq)∣ Ag(s)

How many electrons are transferred in the following reaction? (The reaction is unbalanced.) Mg(s)+ Al3+(aq)→ Al(s)+ Mg2+(aq)

Identify the components of a fuel cell.

Given that E°red = -0.40 V for Cd2+/Cd at 25 °C, find E° and E for the concentration cell expressed using shorthand notation below: Cd(s)∣ Cd2+(1.0 × 10-5 mol L-1)∣∣ Cd2+(0.100 mol L-1)∣ Cd(s)

What is the balanced chemical equation for the galvanic cell reaction expressed using shorthand notation below? Al(s)∣ Al3+(aq)∣∣ Fe2+(aq)∣ Fe(s)

Identify the battery type that has a high overcharge tolerance.

Which of the following is the strongest oxidizing agent?

What element is being oxidized in the following (unbalanced)redox reaction? H2O2(l)+ ClO2(aq)→ ClO2⁻(aq)+ O2(g)

Which of the following is the weakest reducing agent?

How many grams of nickel metal are plated out when a constant current of 15.0 A is passed through aqueous NiCl2 for 60.0 minutes?

Identify the location of reduction in an electrochemical cell.

Consider the galvanic cell, Which one of the following changes to the cell would cause the cell potential to increase (i.e., become more positive)?

Define a salt bridge.

What is the shorthand notation that represents the following galvanic cell reaction? Pb(s)+ Cu(NO3)2(aq)→ Pb(NO3)2(aq)+ Cu(s)

What is the reducing agent in the redox reaction represented by the following cell notation? Ni(s)∣ Ni2+(aq) Ag+(aq)∣ Ag(s)

Identify the location of oxidation in an electrochemical cell.

Determine the redox reaction represented by the following cell notation: Mg(s)∣ Mg2+(aq) Cu2+(aq)∣ Cu(s)

Units of Measurement for Physical and Chemical Change

Atoms and Elements

Molecules, Compounds, and Nomenclature

Chemical Reactions and Stoichiometry

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding Ii: Molecular Shapes, Valence Bond Theory, and Molecular Orbital Theory

Liquids, Solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Radioactivity and Nuclear Chemistry

Organic Chemistry I: Structures

Organic Chemistry II: Reactions

Biochemistry

Chemistry of the Nonmetals

Metals and Metallury

Transition Metals and Coordination Compounds

Filters

What element is being reduced in the following (unbalanced)redox reaction? H₂O₂(l)+ ClO₂(aq)→ ClO₂⁻(aq)+ O₂(g)

What is the reducing agent in the redox reaction represented by the following cell notation? Sn(s)∣ Sn²⁺(aq) Ag⁺(aq)∣ Ag(s)

How many electrons are transferred in the following reaction? (The reaction is unbalanced.) Mg(s)+ Al³⁺(aq)→ Al(s)+ Mg²⁺(aq)

Given that E°_red = -0.40 V for Cd²⁺/Cd at 25 °C, find E° and E for the concentration cell expressed using shorthand notation below: Cd(s)∣ Cd²⁺(1.0 × 10^-5 mol L^-1)∣∣ Cd²⁺(0.100 mol L^-1)∣ Cd(s)

What is the balanced chemical equation for the galvanic cell reaction expressed using shorthand notation below? Al(s)∣ Al³⁺(aq)∣∣ Fe²⁺(aq)∣ Fe(s)

What element is being oxidized in the following (unbalanced)redox reaction? H₂O₂(l)+ ClO₂(aq)→ ClO₂⁻(aq)+ O₂(g)

How many grams of nickel metal are plated out when a constant current of 15.0 A is passed through aqueous NiCl₂ for 60.0 minutes?

What is the shorthand notation that represents the following galvanic cell reaction? Pb(s)+ Cu(NO₃)₂(aq)→ Pb(NO₃)₂(aq)+ Cu(s)

What is the reducing agent in the redox reaction represented by the following cell notation? Ni(s)∣ Ni²⁺(aq) Ag⁺(aq)∣ Ag(s)

Determine the redox reaction represented by the following cell notation: Mg(s)∣ Mg²⁺(aq) Cu²⁺(aq)∣ Cu(s)