Question 1

What is electrolysis?

Accepted Answer

An electrical curren

Question 2

Which of the following is the strongest reducing agent?

Accepted Answer

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

Question 3

Calculate the cell potential for the following reaction that takes place in an electrochemical cell at 25°C. Mg(s)∣ Mg2+(aq,2.74 M)   Cu2+(aq,0.0033 M)∣ Cu(s)

Accepted Answer

A)  -2.80 V 
B)  +2.62 V 
C)  +2.71 V 
D)  +2.12 V 
E)  -1.94 V 
A)  -2.80 V 
B)  +2.62 V 
C)  +2.71 V 
D)  +2.12 V 
E)  -1.94 V

Question 4

Identify oxidation.

Accepted Answer

A)  increase in oxidation number 
B)  loss of electrons 
C)  gain of protons 
D)  loss of neutrons 
E)  both A and B 
A)  increase in oxidation number 
B)  loss of electrons 
C)  gain of protons 
D)  loss of neutrons 
E)  both A and B

Question 5

In a lead-acid storage battery,PbO2 is reduced to

Accepted Answer

A)  Pb. 
B)  PbSO4. 
C)  Pb2O. 
D)  PbO3. 
E)  PbO. 
A)  Pb. 
B)  PbSO4. 
C)  Pb2O. 
D)  PbO3. 
E)  PbO.

Question 6

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 7

Define extraction.

Accepted Answer

A)  Free metal is oxidized out of its ore. 
B)  Undesired reduction of metals from reducing agents in the environment 
C)  Plating a film on a metal to protect it 
D)  Undesired oxidation of metals from oxidizing agents in the environment 
E)  Free metal is reduced out of its ore. 
A)  Free metal is oxidized out of its ore. 
B)  Undesired reduction of metals from reducing agents in the environment 
C)  Plating a film on a metal to protect it 
D)  Undesired oxidation of metals from oxidizing agents in the environment 
E)  Free metal is reduced out of its ore.

Question 8

Identify a component in the formation of rust.

Accepted Answer

A)  salt 
B)  moisture 
C)  acid 
D)  all of the above 
E)  none of the above 
A)  salt 
B)  moisture 
C)  acid 
D)  all of the above 
E)  none of the above

Question 9

Determine the cell notation for the redox reaction given below. Cd(s)+ 2 Ag⁺(aq)→ Cd2+(aq)+ 2 Ag(s)

Accepted Answer

A)  Ag+(aq) ∣ Ag(s)   Cd(s) ∣ Cd2+(aq) 
B)  Ag(s) ∣ Ag+(aq)   Cd2+(aq) ∣ Cd(s) 
C)  Cd(s) ∣ Cd2+(aq)   Ag+(aq) ∣ Ag(s) 
D)  Cd2+(aq) ∣ Cd(s)   Ag(s) ∣ Ag+(aq) 
E)  Cd(s) ∣ Ag(s)   Cd2+(aq) ∣ Ag+(aq) 
A)  Ag+(aq) ∣ Ag(s)   Cd(s) ∣ Cd2+(aq) 
B)  Ag(s) ∣ Ag+(aq)   Cd2+(aq) ∣ Cd(s) 
C)  Cd(s) ∣ Cd2+(aq)   Ag+(aq) ∣ Ag(s) 
D)  Cd2+(aq) ∣ Cd(s)   Ag(s) ∣ Ag+(aq) 
E)  Cd(s) ∣ Ag(s)   Cd2+(aq) ∣ Ag+(aq)

Question 10

Use the tabulated half-cell potentials to calculate ΔG° for the following balanced redox reaction. Pb2+(aq)+ Cu(s)→ Pb(s)+ Cu2+(aq)

Accepted Answer

A)  -41 kJ 
B)  -0.47 kJ 
C)  +46 kJ 
D)  +91 kJ 
E)  -21 kJ 
A)  -41 kJ 
B)  -0.47 kJ 
C)  +46 kJ 
D)  +91 kJ 
E)  -21 kJ

Question 11

Which of the following is the weakest oxidizing agent?

Accepted Answer

A)  H2O2(aq) 
B)  Al3+(aq) 
C)  ClO2(g) 
D)  F-(aq) 
E)  Pb(s) 
A)  H2O2(aq) 
B)  Al3+(aq) 
C)  ClO2(g) 
D)  F-(aq) 
E)  Pb(s)

Question 12

Which of the following reactions would be the most spontaneous at 298 K?

Accepted Answer

A)  A + 2 B → C; E°cell = +0.98 V 
B)  A + B → 2 C; E°cell = -0.040 V 
C)  A + B → 3 C; E°cell = +0.15 V 
D)  A + B → C; E°cell = +1.22 V 
E)  More information is needed to determine. 
A)  A + 2 B → C; E°cell = +0.98 V 
B)  A + B → 2 C; E°cell = -0.040 V 
C)  A + B → 3 C; E°cell = +0.15 V 
D)  A + B → C; E°cell = +1.22 V 
E)  More information is needed to determine.

Question 13

How many electrons are transferred in the following reaction? (The reaction is unbalanced.) Br2(s)+ Fe(s)→ Fe3+(aq)+ Br⁻(aq)

Accepted Answer

A)  1 
B)  2 
C)  6 
D)  0 
E)  3 
A)  1 
B)  2 
C)  6 
D)  0 
E)  3

Question 14

What is undergoing reduction in the redox reaction represented by the following cell notation? Pb(s)∣ Pb2+(aq)   H+(aq)∣ H2(g)∣ Pt

Accepted Answer

A)  H2(g) 
B)  H+(aq) 
C)  Pb2+(aq) 
D)  Pb(s) 
E)  Pt 
A)  H2(g) 
B)  H+(aq) 
C)  Pb2+(aq) 
D)  Pb(s) 
E)  Pt

Question 15

Nickel can be plated from aqueous solution according to the following half reaction.How long would it take (in min)to plate 29.6 g of nickel at 4.7 A? Ni2+(aq)+ 2 e⁻ → Ni(s)

Accepted Answer

A)  1.7 × 102 min 
B)  5.9 × 102 min 
C)  3.5 × 102 min 
D)  4.8 × 102 min 
E)  6.2 × 102 min 
A)  1.7 × 102 min 
B)  5.9 × 102 min 
C)  3.5 × 102 min 
D)  4.8 × 102 min 
E)  6.2 × 102 min

Question 16

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 by 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 by which counterions can flow between the half-cells without the solutions in the half-cell totally mixing.

Question 17

In a hydrogen-oxygen fuel cell,

Accepted Answer

A)  no transfer of electrons occurs. 
B)  both oxygen and hydrogen atoms lose electrons. 
C)  both oxygen and hydrogen atoms gain electrons. 
D)  oxygen atoms lose electrons and hydrogen atoms gain electrons. 
E)  oxygen atoms gain electrons and hydrogen atoms lose electrons. 
A)  no transfer of electrons occurs. 
B)  both oxygen and hydrogen atoms lose electrons. 
C)  both oxygen and hydrogen atoms gain electrons. 
D)  oxygen atoms lose electrons and hydrogen atoms gain electrons. 
E)  oxygen atoms gain electrons and hydrogen atoms lose electrons.

Question 18

Aluminum is quickly oxidized in the air to form

Accepted Answer

A)  Al2O3. 
B)  Al(OH)2. 
C)  Al(OH)3. 
D)  Al3O2. 
E)  AlO. 
A)  Al2O3. 
B)  Al(OH)2. 
C)  Al(OH)3. 
D)  Al3O2. 
E)  AlO.

Question 19

To prevent rust,nails are coated with

Accepted Answer

A)  zinc. 
B)  salt. 
C)  calcium. 
D)  sodium. 
E)  lithium. 
A)  zinc. 
B)  salt. 
C)  calcium. 
D)  sodium. 
E)  lithium.

Question 20

Which of the following metals will dissolve in nitric acid but NOT hydrochloric?

Accepted Answer

A)  Ba 
B)  Mn 
C)  Cu 
D)  Cr 
E)  Mg 
A)  Ba 
B)  Mn 
C)  Cu 
D)  Cr 
E)  Mg

Exam 19: Electrochemistry

What is electrolysis?

Which of the following is the strongest reducing agent?

Calculate the cell potential for the following reaction that takes place in an electrochemical cell at 25°C. Mg(s)∣ Mg2+(aq,2.74 M) Cu2+(aq,0.0033 M)∣ Cu(s)

Identify oxidation.

In a lead-acid storage battery,PbO2 is reduced to

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

Define extraction.

Identify a component in the formation of rust.

Determine the cell notation for the redox reaction given below. Cd(s)+ 2 Ag⁺(aq)→ Cd2+(aq)+ 2 Ag(s)

Use the tabulated half-cell potentials to calculate ΔG° for the following balanced redox reaction. Pb2+(aq)+ Cu(s)→ Pb(s)+ Cu2+(aq)

Which of the following is the weakest oxidizing agent?

Which of the following reactions would be the most spontaneous at 298 K?

How many electrons are transferred in the following reaction? (The reaction is unbalanced.) Br2(s)+ Fe(s)→ Fe3+(aq)+ Br⁻(aq)

What is undergoing reduction in the redox reaction represented by the following cell notation? Pb(s)∣ Pb2+(aq) H+(aq)∣ H2(g)∣ Pt

Nickel can be plated from aqueous solution according to the following half reaction.How long would it take (in min)to plate 29.6 g of nickel at 4.7 A? Ni2+(aq)+ 2 e⁻ → Ni(s)

Define a salt bridge.

In a hydrogen-oxygen fuel cell,

Aluminum is quickly oxidized in the air to form

To prevent rust,nails are coated with

Which of the following metals will dissolve in nitric acid but NOT hydrochloric?

Matter, measurement, and Problem Solving

Atoms and Elements

Molecules,compounds,and Chemical Equations

Chemical Quantities and Aqueous Reactions

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,

Liquids,solids,and Intermolecular Forces

Solids and Modern Materials

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Free Energy and Thermodynamics

Radioactivity and Nuclear Chemistry

Organic Chemistry

Biochemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Transition Metals and Coordination Compounds

Filters

Calculate the cell potential for the following reaction that takes place in an electrochemical cell at 25°C. Mg(s)∣ Mg²⁺(aq,2.74 M) Cu²⁺(aq,0.0033 M)∣ Cu(s)

In a lead-acid storage battery,PbO₂ is reduced to

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

Determine the cell notation for the redox reaction given below. Cd(s)+ 2 Ag⁺(aq)→ Cd²⁺(aq)+ 2 Ag(s)

Use the tabulated half-cell potentials to calculate ΔG° for the following balanced redox reaction. Pb²⁺(aq)+ Cu(s)→ Pb(s)+ Cu²⁺(aq)

How many electrons are transferred in the following reaction? (The reaction is unbalanced.) Br₂(s)+ Fe(s)→ Fe³⁺(aq)+ Br⁻(aq)

What is undergoing reduction in the redox reaction represented by the following cell notation? Pb(s)∣ Pb²⁺(aq) H⁺(aq)∣ H₂(g)∣ Pt

Nickel can be plated from aqueous solution according to the following half reaction.How long would it take (in min)to plate 29.6 g of nickel at 4.7 A? Ni²⁺(aq)+ 2 e⁻ → Ni(s)