Question 1

Give an example of an inert electrode.

Accepted Answer

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Question 2

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.) Pb(s)+ Br2(l)→ Pb2+(aq)+ 2 Br⁻(aq)
Pb2+(aq)+ 2 e⁻ → Pb(s)E° = -0.13 V
Br2(l)+ 2 e- → 2 Br-(aq)E° = +1.07 V

Accepted Answer

A)  +1.20 V 
B)  +0.94 V 
C)  -0.94 V 
D)  -1.20 V 
E)  -0.60 V 
A)  +1.20 V 
B)  +0.94 V 
C)  -0.94 V 
D)  -1.20 V 
E)  -0.60 V

Question 3

In a hydrogen-oxygen fuel cell,

Accepted Answer

A)  neither oxygen or hydrogen atoms are oxidized or reduced. 
B)  both oxygen and hydrogen atoms are oxidized. 
C)  both oxygen and hydrogen atoms are reduced. 
D)  oxygen atoms are reduced and hydrogen atoms are oxidized. 
E)  oxygen atoms are oxidized and hydrogen atoms are reduced. 
A)  neither oxygen or hydrogen atoms are oxidized or reduced. 
B)  both oxygen and hydrogen atoms are oxidized. 
C)  both oxygen and hydrogen atoms are reduced. 
D)  oxygen atoms are reduced and hydrogen atoms are oxidized. 
E)  oxygen atoms are oxidized and hydrogen atoms are reduced.

Question 4

What is the shorthand notation that represents the following galvanic cell reaction? Sn2+(aq)+ F2(g)→ Sn3+(aq)+ 2 F-(aq)

Accepted Answer

A)  Sn2+(aq) ∣ Sn3+(aq) ∣∣ F2(g) ∣ F-(aq) 
B)  Sn(s) ∣ Sn2+(aq) ∣∣ Sn4+(aq) F2(g) ∣ F-(aq) ∣ C(s) 
C)  Pt(s) ∣ Sn4+(aq), Sn2+(aq), F2(g) ∣∣ F-(aq) ∣ C(s) 
D)  Pt(s) ∣ Sn2+(aq), Sn3+(aq) ∣∣ F2(g) ∣ F-(aq) ∣ C(s) 
A)  Sn2+(aq) ∣ Sn3+(aq) ∣∣ F2(g) ∣ F-(aq) 
B)  Sn(s) ∣ Sn2+(aq) ∣∣ Sn4+(aq) F2(g) ∣ F-(aq) ∣ C(s) 
C)  Pt(s) ∣ Sn4+(aq), Sn2+(aq), F2(g) ∣∣ F-(aq) ∣ C(s) 
D)  Pt(s) ∣ Sn2+(aq), Sn3+(aq) ∣∣ F2(g) ∣ F-(aq) ∣ C(s)

Question 5

Describe how water can be a good conductor of current.

Accepted Answer

A)  use pure water 
B)  heat the water 
C)  add salt 
D)  chill the water 
E)  vaporize the water 
A)  use pure water 
B)  heat the water 
C)  add salt 
D)  chill the water 
E)  vaporize the water

Question 6

A voltaic cell

Accepted Answer

A)  produces electrical current from a spontaneous chemical reaction. 
B)  produces electrical current from electricity. 
C)  consumes electrical current to drive a spontaneous chemical reaction. 
D)  produces electrical current from a nonspontaneous chemical reaction. 
E)  consumes electrical current to drive a nonspontaneous chemical reaction. 
A)  produces electrical current from a spontaneous chemical reaction. 
B)  produces electrical current from electricity. 
C)  consumes electrical current to drive a spontaneous chemical reaction. 
D)  produces electrical current from a nonspontaneous chemical reaction. 
E)  consumes electrical current to drive a nonspontaneous chemical reaction.

Question 7

A voltaic cell is constructed with two Zn2+-Zn electrodes,where the half-reaction is Zn2+ + 2e- → Zn(s)E° = -0.763 V
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)  -1.54 × 10-3 
B)  -378 
C)  0.0798 
D)  0.160 
E)  -0.761 
A)  -1.54 × 10-3 
B)  -378 
C)  0.0798 
D)  0.160 
E)  -0.761

Question 8

Why is sugar water NOT a good conductor of current?

Accepted Answer

Sugar water contains no ions;

Question 9

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)+ 2 Ag⁺(aq)→ Sn2+(aq)+ 2 Ag(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

Question 10

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 11

Predict the species that will be oxidized first if the following mixture of molten salts undergoes electrolysis. Cu2+,Mg2+,Cl⁻,Br⁻,F⁻

Accepted Answer

A)  Cl- 
B)  F- 
C)  Cu2+ 
D)  Mg2+ 
E)  Br- 
A)  Cl- 
B)  F- 
C)  Cu2+ 
D)  Mg2+ 
E)  Br-

Question 12

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

Accepted Answer

A)  Mg 
B)  Cu 
C)  Fe 
D)  K 
E)  all of the above 
A)  Mg 
B)  Cu 
C)  Fe 
D)  K 
E)  all of the above

Question 13

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

Question 14

What mass of silver can be plated onto an object in 33.5 minutes at 8.70 A of current? Ag⁺(aq)+ e⁻ → Ag(s)

Accepted Answer

A)  19.6 g 
B)  0.326 g 
C)  9.78 g 
D)  3.07 g 
E)  0.102 g 
A)  19.6 g 
B)  0.326 g 
C)  9.78 g 
D)  3.07 g 
E)  0.102 g

Question 15

Describe the reactions during the electrolysis of water.

Accepted Answer

A)  Oxygen is reduced and hydrogen is oxidized. 
B)  Oxygen and hydrogen are both oxidized. 
C)  Oxygen and hydrogen are both reduced. 
D)  Oxygen is oxidized and hydrogen is reduced. 
E)  Neither oxygen nor hydrogen are oxidized or reduced. 
A)  Oxygen is reduced and hydrogen is oxidized. 
B)  Oxygen and hydrogen are both oxidized. 
C)  Oxygen and hydrogen are both reduced. 
D)  Oxygen is oxidized and hydrogen is reduced. 
E)  Neither oxygen nor hydrogen are oxidized or reduced.

Question 16

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 17

Using the following standard reduction potentials, Fe3+(aq)+ e-  → Fe2+(aq)E° = +0.77 V
Ni2+(aq)+ 2 e-  → Ni(s)E° = -0.23 V
Calculate the standard cell potential for the galvanic cell reaction given below,and determine whether or not this reaction is spontaneous under standard conditions.
Ni2+(aq)+ 2 Fe2+(aq)→ 2 Fe3+(aq)+ Ni(s)

Accepted Answer

A)  E° = -1.00 V, nonspontaneous 
B)  E° = -1.00 V, spontaneous 
C)  E° = +1.00 V, nonspontaneous 
D)  E° = +1.00 V, spontaneous 
A)  E° = -1.00 V, nonspontaneous 
B)  E° = -1.00 V, spontaneous 
C)  E° = +1.00 V, nonspontaneous 
D)  E° = +1.00 V, spontaneous

Question 18

What element is being oxidized in the following redox reaction? C10H22O2(aq)+ KMnO4(aq)→ C10H16O4K2(aq)+ MnO2(aq)

Accepted Answer

A)  C 
B)  H 
C)  O 
D)  K 
E)  Mn 
A)  C 
B)  H 
C)  O 
D)  K 
E)  Mn

Question 19

Determine the cell notation for the redox reaction given below. 3 Cl2(g)+ 2 Fe(s)→ 6 Cl⁻(aq)+ 2 Fe3+(aq)

Accepted Answer

A)  Cl2(g) ∣ Cl⁻(aq) ∣ Pt   Fe(s) ∣ Fe3+(aq) 
B)  Cl⁻(aq) ∣ Cl2(g) ∣ Pt   Fe3+(aq) ∣ Fe(s) 
C)  Fe3+(aq) ∣ Fe(s)   Cl⁻(aq) ∣ Cl2(g) ∣ Pt 
D)  Fe(s) ∣ Cl2(g)   Fe3+(aq) ∣ Cl⁻(aq) ∣ Pt 
E)  Fe(s) ∣ Fe3+(aq)   Cl2(g) ∣ Cl⁻(aq) ∣ Pt 
A)  Cl2(g) ∣ Cl⁻(aq) ∣ Pt   Fe(s) ∣ Fe3+(aq) 
B)  Cl⁻(aq) ∣ Cl2(g) ∣ Pt   Fe3+(aq) ∣ Fe(s) 
C)  Fe3+(aq) ∣ Fe(s)   Cl⁻(aq) ∣ Cl2(g) ∣ Pt 
D)  Fe(s) ∣ Cl2(g)   Fe3+(aq) ∣ Cl⁻(aq) ∣ Pt 
E)  Fe(s) ∣ Fe3+(aq)   Cl2(g) ∣ Cl⁻(aq) ∣ Pt

Question 20

What is undergoing oxidation in the redox reaction represented by the following cell notation? Ni(s)∣ Ni2+(aq)   H+(aq)∣ H2(g)∣ Pt

Accepted Answer

A)  H2(g) 
B)  H+(aq) 
C)  Ni2+(aq) 
D)  Ni(s) 
E)  Pt 
A)  H2(g) 
B)  H+(aq) 
C)  Ni2+(aq) 
D)  Ni(s) 
E)  Pt

Exam 19: Electrochemistry

Give an example of an inert electrode.

In a hydrogen-oxygen fuel cell,

What is the shorthand notation that represents the following galvanic cell reaction? Sn2+(aq)+ F2(g)→ Sn3+(aq)+ 2 F-(aq)

Describe how water can be a good conductor of current.

A voltaic cell

A voltaic cell is constructed with two Zn2+-Zn electrodes,where the half-reaction is Zn2+ + 2e- → Zn(s)E° = -0.763 V 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.

Why is sugar water NOT a good conductor of current?

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?

Predict the species that will be oxidized first if the following mixture of molten salts undergoes electrolysis. Cu2+,Mg2+,Cl⁻,Br⁻,F⁻

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

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 mass of silver can be plated onto an object in 33.5 minutes at 8.70 A of current? Ag⁺(aq)+ e⁻ → Ag(s)

Describe the reactions during the electrolysis of water.

Identify the location of oxidation in an electrochemical cell.

What element is being oxidized in the following redox reaction? C10H22O2(aq)+ KMnO4(aq)→ C10H16O4K2(aq)+ MnO2(aq)

Determine the cell notation for the redox reaction given below. 3 Cl2(g)+ 2 Fe(s)→ 6 Cl⁻(aq)+ 2 Fe3+(aq)

What is undergoing oxidation in the redox reaction represented by the following cell notation? Ni(s)∣ Ni2+(aq) H+(aq)∣ H2(g)∣ Pt

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

What is the shorthand notation that represents the following galvanic cell reaction? Sn²⁺(aq)+ F₂(g)→ Sn³⁺(aq)+ 2 F^-(aq)

A voltaic cell is constructed with two Zn²⁺-Zn electrodes,where the half-reaction is Zn²⁺ + 2e^- → Zn(s)E° = -0.763 V 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.

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?

Predict the species that will be oxidized first if the following mixture of molten salts undergoes electrolysis. Cu²⁺,Mg²⁺,Cl⁻,Br⁻,F⁻

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 redox reaction? C₁₀H₂₂O₂(aq)+ KMnO₄(aq)→ C₁₀H₁₆O₄K₂(aq)+ MnO₂(aq)

Determine the cell notation for the redox reaction given below. 3 Cl₂(g)+ 2 Fe(s)→ 6 Cl⁻(aq)+ 2 Fe³⁺(aq)

What is undergoing oxidation in the redox reaction represented by the following cell notation? Ni(s)∣ Ni²⁺(aq) H⁺(aq)∣ H₂(g)∣ Pt