Question 1

Fuel cells

Accepted Answer

A) produce carbon dioxide and hydrogen. 
B) emit sulfur oxides. 
C) are environmentally clean. 
D) cannot be used in vehicles. 
A) produce carbon dioxide and hydrogen. 
B) emit sulfur oxides. 
C) are environmentally clean. 
D) cannot be used in vehicles.

Question 2

In the galvanic cell represented by the shorthand notation
Al(s)|Al3+(aq)||Fe3+(aq)|Fe(s)
the anode is ________ and the cathode is ________.

Accepted Answer

Question 3

Consider the following galvanic cell.  
-What is the quantitative change in the cell voltage on increasing the ion concentration in the anode compartment by a factor of 10?

Accepted Answer

A) +0.06 V 
B) +0.03 V 
C) -0.03 V 
D) -0.06 V 
A) +0.06 V 
B) +0.03 V 
C) -0.03 V 
D) -0.06 V

Question 4

For the galvanic cell reaction,expressed below using shorthand notation,what half-reaction occurs at the cathode? Zn(s)∣ Zn2+(aq)∣∣ Ni2+(aq)∣ Ni(s)

Accepted Answer

A) Zn(s)→ Zn2+(aq)+ 2 e- 
B) Zn2+(aq)+ 2 e- → Zn(s) 
C) Ni(s)→ Ni2+(aq)+ 2 e- 
D) Ni2+(aq)+ 2 e- → Ni(s) 
A) Zn(s)→ Zn2+(aq)+ 2 e- 
B) Zn2+(aq)+ 2 e- → Zn(s) 
C) Ni(s)→ Ni2+(aq)+ 2 e- 
D) Ni2+(aq)+ 2 e- → Ni(s)

Question 5

Based on the balanced chemical equation shown below,determine the molarity of a solution containing Fe2+(aq),if 40.00 mL of the Fe2+(aq)solution is required to completely react with 30.00 mL of a 0.125 M potassium bromate,KBrO3(aq),solution.The chemical equation for the reaction is: 6 Fe2+(aq)+ BrO3-(aq)+ 6 H+(aq)→ 6 Fe3+(aq)+ Br-(aq)+ 3 H2O(l).

Accepted Answer

A) 0.0156 M 
B) 0.0938 M 
C) 0.562 M 
D) 1.00 M 
A) 0.0156 M 
B) 0.0938 M 
C) 0.562 M 
D) 1.00 M

Question 6

Using the following standard reduction potentials, Fe3+(aq)+ e- → Fe2+(aq)E° = +0.77 V
Cd2+(aq)+ 2 e- →Cd(s)E° = -0.40 V
Calculate the standard cell potential for the cell reaction given below,and determine whether or not this reaction is spontaneous under standard conditions.
Cd2+(aq)+ 2 Fe2+(aq)→ 2 Fe3+(aq)+ Cd(s)

Accepted Answer

A) E° = -1.17 V,nonspontaneous 
B) E° = -1.17 V,spontaneous 
C) E° = +1.17,nonspontaneous 
D) E° = + 1.17,spontaneous 
A) E° = -1.17 V,nonspontaneous 
B) E° = -1.17 V,spontaneous 
C) E° = +1.17,nonspontaneous 
D) E° = + 1.17,spontaneous

Question 7

What is the relationship between the standard cell potentials,E°,for the following two galvanic cell reactions? I.3 Cu2+(aq)+ 2 Al(s)→ 3 Cu(s)+ 2 Al3+(aq)
II.30 Cu2+(aq)+ 22 Al(s)→ 30 Cu(s)+ 22 Al3+(aq)

Accepted Answer

A) E°(I)= E°(II) 
B) E°(I)=  
E°(II) 
C) E°(I)= 10E°(II) 
D) E°(I)= E°(II)10 
A) E°(I)= E°(II) 
B) E°(I)=  
E°(II) 
C) E°(I)= 10E°(II) 
D) E°(I)= E°(II)10

Question 8

When suspected drunk drivers are tested with a Breathalyzer,the alcohol (ethanol)in the exhaled breath is oxidized to acetic acid with an acidic solution of potassium dichromate: 3 CH3CH2OH(aq)+ 2 Cr2O7-2 (aq)+ 16 H+(aq)3CH3CO2H(aq)+ 4Cr+3(aq)+ 11H2O (l)
What is the value of E for the reaction when the concentrations of ethanol,acetic acid,Cr2O7-2,and Cr+3,are 1.0M and the pH is 4.00? (Eº for this cell is 1.30V and the temperature is 298K).
Equations to solve this problem are below.
Ε = ε° -   lnQ
Ε = 1.30 -   ln

Accepted Answer

A) 1.62 V 
B) 1.30 V 
C) 0.98 V 
D) 1.24 V 
A) 1.62 V 
B) 1.30 V 
C) 0.98 V 
D) 1.24 V

Question 9

What is the standard cell potential for the reaction below? Pb(s)+ Br2(l)→ Pb2+(aq)+ 2 Br-(aq)
The standard reduction potential is -0.13 V for the Pb2+/Pb half-cell and +1.09 V for the Br2/Br- half-cell.

Accepted Answer

A) -1.22 V 
B) -0.95 V 
C) +0.95 V 
D) +1.22 V 
A) -1.22 V 
B) -0.95 V 
C) +0.95 V 
D) +1.22 V

Question 10

A galvanic cell employs the reaction Ni2+(aq)+ Cu(s)→ Ni(s)+ Cu2+(aq)
And KNO3 is the salt used in the salt bridge.During the course of the reaction

Accepted Answer

A) K+ leaves the salt bridge and enters the anode compartment. 
B) KNO3 leaves the salt bridge and enters the anode compartment. 
C) K+ leaves the salt bridge and enters the cathode compartment. 
D) KNO3 leaves the salt bridge and enters the cathode compartment. 
A) K+ leaves the salt bridge and enters the anode compartment. 
B) KNO3 leaves the salt bridge and enters the anode compartment. 
C) K+ leaves the salt bridge and enters the cathode compartment. 
D) KNO3 leaves the salt bridge and enters the cathode compartment.

Question 11

Which statement concerning overvoltage is false?

Accepted Answer

A) Overvoltage is the additional voltage above the calculated voltage required to bring about electrolysis. 
B) Overvoltage is often due to a high activation energy for the reaction at one electrode. 
C) Overvoltage is small for half-reactions involving the formation of O2(g)or H2(g). 
D) Overvoltage must be experimentally determined. 
A) Overvoltage is the additional voltage above the calculated voltage required to bring about electrolysis. 
B) Overvoltage is often due to a high activation energy for the reaction at one electrode. 
C) Overvoltage is small for half-reactions involving the formation of O2(g)or H2(g). 
D) Overvoltage must be experimentally determined.

Question 12

The cell reaction for a lead storage battery is: Pb(s)+ PbO2(s)+ 2 H+(aq)+ 2 HSO4-(aq)→ 2 PbSO4(s)+ 2 H2O(l)
E° = +1.92 V
To provide a potential of about 12 V,one could

Accepted Answer

A) adjust the pH to 12. 
B) adjust the pH to 1. 
C) connect six cells in series. 
D) greatly increase the surface area of the Pb(s)and PbO2(s). 
A) adjust the pH to 12. 
B) adjust the pH to 1. 
C) connect six cells in series. 
D) greatly increase the surface area of the Pb(s)and PbO2(s).

Question 13

Consider the following standard reduction potentials, Al3+(aq)+ 3 e- → Al(s)E° = -1.66 V
I2(s)+ 2 e- → 2 I-(aq)E° = +0.54 V
Under standard conditions,

Accepted Answer

A) Al3+(aq)is a stronger oxidizing agent than I2(s),and I-(aq)is a stronger reducing agent than Al(s). 
B) I2(s)is a stronger oxidizing agent than Al3+(aq),and Al(s)is a stronger reducing agent than I-(aq). 
C) Al(s)is a stronger oxidizing agent than I-(aq),and Al3+(aq)is a stronger reducing agent than I2(s). 
D) I-(aq)is a stronger oxidizing agent than Al(s),and I2(s)is a stronger reducing agent than Al3+(aq). 
A) Al3+(aq)is a stronger oxidizing agent than I2(s),and I-(aq)is a stronger reducing agent than Al(s). 
B) I2(s)is a stronger oxidizing agent than Al3+(aq),and Al(s)is a stronger reducing agent than I-(aq). 
C) Al(s)is a stronger oxidizing agent than I-(aq),and Al3+(aq)is a stronger reducing agent than I2(s). 
D) I-(aq)is a stronger oxidizing agent than Al(s),and I2(s)is a stronger reducing agent than Al3+(aq).

Question 14

Based on the half-reactions and their respective standard reduction potentials below,the strongest reducing agent is ________,and the strongest oxidizing agent is ________.
Fe3+(aq)+ e- → Fe2+(aq)0.77 V
Cu2+(aq)+ 2 e- → Cu (aq)0.15 V
Zn2+(aq)+ 2 e- → Zn(s)-0.76 V

Accepted Answer

Question 15

For the hypothetical reaction A + Bx → Ax + B,E° = 1.30 V and ΔG° = -251 kJ.For this reaction the value of x = ________.

Accepted Answer

Question 16

What is the oxidation half reaction in the following chemical reaction? Mn(s)+ 2 H+(aq)→ Mn2+(aq)+ H2(g)

Accepted Answer

A) Mn(s)→ Mn2+(aq)+ 2e- 
B) Mn2+(aq)+ 2e- → Mn(s) 
C) 2 H+(aq)+ 2e- → H2(g) 
D) H2(g)→ 2 H+(aq)+ 2e- 
A) Mn(s)→ Mn2+(aq)+ 2e- 
B) Mn2+(aq)+ 2e- → Mn(s) 
C) 2 H+(aq)+ 2e- → H2(g) 
D) H2(g)→ 2 H+(aq)+ 2e-

Question 17

What is the balanced equation for the galvanic cell reaction expressed using shorthand notation below? Pt(s)|Sn2+(aq)|Sn4+(aq)∣∣Cl2(l)|Cl-(aq)|Pt(s)

Accepted Answer

A) Sn2+(aq)+ Cl2(l)→ Sn4+(aq)+ 2 Cl-(aq) 
B) Sn2+(aq)+ 2 Cl-(aq)→ Sn4+(aq)+ Cl2(l) 
C) Sn4+(aq)+ Cl2(l)→ Sn2+(aq)+ 2 Cl-(aq) 
D) Sn4+(aq)+ 2 Cl-(aq)→ Sn2+(aq)+ Cl2(l) 
A) Sn2+(aq)+ Cl2(l)→ Sn4+(aq)+ 2 Cl-(aq) 
B) Sn2+(aq)+ 2 Cl-(aq)→ Sn4+(aq)+ Cl2(l) 
C) Sn4+(aq)+ Cl2(l)→ Sn2+(aq)+ 2 Cl-(aq) 
D) Sn4+(aq)+ 2 Cl-(aq)→ Sn2+(aq)+ Cl2(l)

Question 18

Given that E° = +0.897 V,calculate E at 25°C for Pb(s)∣ Pb2+(0.0400 M)∣∣ Fe3+(0.200 M),Fe2+(0.0100 M)∣ Pt(s)

Accepted Answer

A) +0.779 V 
B) +0.935 V 
C) +1.015 V 
D) +1.134 V 
A) +0.779 V 
B) +0.935 V 
C) +1.015 V 
D) +1.134 V

Question 19

When the equation below is balanced in acidic solution using the smallest whole numbers,the coefficient in front of the H2O(l)is ________.
Fe2+(aq)+ BrO3-(aq)→ Fe3+(aq)+ Br-(aq)

Accepted Answer

Question 20

The gas OF2 can be produced from the electrolysis of an aqueous solution of KF,as shown in the equation below. OF2(g)+ 2 H+(aq)+ 4 e- → H2O(l)+ 2 F-(aq)E° = +2.15 V
Using the given standard reduction potential,calculate the amount of OF2 that is produced,and the electrode at which the OF2 is produced,upon the passage of 0.240 faradays through an aqueous KF solution.

Accepted Answer

A) 3.24 g of OF2 at the anode 
B) 13.0 g of OF2 at the anode 
C) 3.24 g of OF2 at the cathode 
D) 13.0 g of OF2 at the cathode 
A) 3.24 g of OF2 at the anode 
B) 13.0 g of OF2 at the anode 
C) 3.24 g of OF2 at the cathode 
D) 13.0 g of OF2 at the cathode

Fuel cells

In the galvanic cell represented by the shorthand notation Al(s)|Al³⁺(aq)||Fe³⁺(aq)|Fe(s) the anode is and the cathode is .

Consider the following galvanic cell. -What is the quantitative change in the cell voltage on increasing the ion concentration in the anode compartment by a factor of 10?

For the galvanic cell reaction,expressed below using shorthand notation,what half-reaction occurs at the cathode? Zn(s)∣ Zn²⁺(aq)∣∣ Ni²⁺(aq)∣ Ni(s)

What is the relationship between the standard cell potentials,E°,for the following two galvanic cell reactions? I.3 Cu²⁺⁽^aq)+ 2 Al(s)→ 3 Cu(s)+ 2 Al³⁺(aq) II.30 Cu²⁺⁽^aq)+ 22 Al(s)→ 30 Cu(s)+ 22 Al³⁺(aq)

What is the standard cell potential for the reaction below? Pb(s)+ Br₂(l)→ Pb²⁺(aq)+ 2 Br^-(aq) The standard reduction potential is -0.13 V for the Pb²⁺/Pb half-cell and +1.09 V for the Br₂/Br^- half-cell.

A galvanic cell employs the reaction Ni²⁺(aq)+ Cu(s)→ Ni(s)+ Cu²⁺(aq) And KNO₃ is the salt used in the salt bridge.During the course of the reaction

Which statement concerning overvoltage is false?

The cell reaction for a lead storage battery is: Pb(s)+ PbO₂(s)+ 2 H⁺(aq)+ 2 HSO₄^-(aq)→ 2 PbSO₄(s)+ 2 H₂O(l) E° = +1.92 V To provide a potential of about 12 V,one could

Consider the following standard reduction potentials, Al³⁺(aq)+ 3 e^- → Al(s)E° = -1.66 V I₂(s)+ 2 e^- → 2 I^-(aq)E° = +0.54 V Under standard conditions,

Based on the half-reactions and their respective standard reduction potentials below,the strongest reducing agent is ,and the strongest oxidizing agent is . Fe³⁺(aq)+ e^- → Fe²⁺(aq)0.77 V Cu²⁺(aq)+ 2 e^- → Cu(aq)0.15 V Zn²⁺(aq)+ 2 e^- → Zn(s)-0.76 V

For the hypothetical reaction A + B^x → A^x + B,E° = 1.30 V and ΔG° = -251 kJ.For this reaction the value of x = ________.

What is the oxidation half reaction in the following chemical reaction? Mn(s)+ 2 H⁺(aq)→ Mn²⁺(aq)+ H₂(g)

What is the balanced equation for the galvanic cell reaction expressed using shorthand notation below? Pt(s)|Sn²⁺(aq)|Sn⁴⁺(aq)∣∣Cl₂(l)|Cl^-(aq)|Pt(s)

Given that E° = +0.897 V,calculate E at 25°C for Pb(s)∣ Pb²⁺(0.0400 M)∣∣ Fe³⁺(0.200 M),Fe²⁺(0.0100 M)∣ Pt(s)

When the equation below is balanced in acidic solution using the smallest whole numbers,the coefficient in front of the H₂O(l)is ________. Fe²⁺(aq)+ BrO₃^-(aq)→ Fe³⁺(aq)+ Br^-(aq)

Chemical Tools: Experimentation and Measurement

Atoms, molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Periodicity and the Electronic Structure of Atoms

Ionic Compounds: Periodic Trends and Bonding

Covalent Bonding and Electron-Dot Structures

Covalent Compounds: Bonding Theories and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids, solids, and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Nuclear Chemistry

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

The Main-Group Elements

Connections to Organic and Biological Chemistry

Filters

Exam 18: Electrochemistry

Fuel cells

In the galvanic cell represented by the shorthand notation Al(s)|Al3+(aq)||Fe3+(aq)|Fe(s) the anode is ________ and the cathode is ________.

Consider the following galvanic cell. -What is the quantitative change in the cell voltage on increasing the ion concentration in the anode compartment by a factor of 10?

For the galvanic cell reaction,expressed below using shorthand notation,what half-reaction occurs at the cathode? Zn(s)∣ Zn2+(aq)∣∣ Ni2+(aq)∣ Ni(s)

What is the relationship between the standard cell potentials,E°,for the following two galvanic cell reactions? I.3 Cu2+(aq)+ 2 Al(s)→ 3 Cu(s)+ 2 Al3+(aq) II.30 Cu2+(aq)+ 22 Al(s)→ 30 Cu(s)+ 22 Al3+(aq)

What is the standard cell potential for the reaction below? Pb(s)+ Br2(l)→ Pb2+(aq)+ 2 Br-(aq) The standard reduction potential is -0.13 V for the Pb2+/Pb half-cell and +1.09 V for the Br2/Br- half-cell.

A galvanic cell employs the reaction Ni2+(aq)+ Cu(s)→ Ni(s)+ Cu2+(aq) And KNO3 is the salt used in the salt bridge.During the course of the reaction

Which statement concerning overvoltage is false?

The cell reaction for a lead storage battery is: Pb(s)+ PbO2(s)+ 2 H+(aq)+ 2 HSO4-(aq)→ 2 PbSO4(s)+ 2 H2O(l) E° = +1.92 V To provide a potential of about 12 V,one could

Consider the following standard reduction potentials, Al3+(aq)+ 3 e- → Al(s)E° = -1.66 V I2(s)+ 2 e- → 2 I-(aq)E° = +0.54 V Under standard conditions,

Based on the half-reactions and their respective standard reduction potentials below,the strongest reducing agent is ________,and the strongest oxidizing agent is ________. Fe3+(aq)+ e- → Fe2+(aq)0.77 V Cu2+(aq)+ 2 e- → Cu (aq)0.15 V Zn2+(aq)+ 2 e- → Zn(s)-0.76 V

For the hypothetical reaction A + Bx → Ax + B,E° = 1.30 V and ΔG° = -251 kJ.For this reaction the value of x = ________.

What is the oxidation half reaction in the following chemical reaction? Mn(s)+ 2 H+(aq)→ Mn2+(aq)+ H2(g)

What is the balanced equation for the galvanic cell reaction expressed using shorthand notation below? Pt(s)|Sn2+(aq)|Sn4+(aq)∣∣Cl2(l)|Cl-(aq)|Pt(s)

Given that E° = +0.897 V,calculate E at 25°C for Pb(s)∣ Pb2+(0.0400 M)∣∣ Fe3+(0.200 M),Fe2+(0.0100 M)∣ Pt(s)

When the equation below is balanced in acidic solution using the smallest whole numbers,the coefficient in front of the H2O(l)is ________. Fe2+(aq)+ BrO3-(aq)→ Fe3+(aq)+ Br-(aq)

Chemical Tools: Experimentation and Measurement

Atoms, molecules, and Ions

Mass Relationships in Chemical Reactions

Reactions in Aqueous Solutions

Periodicity and the Electronic Structure of Atoms

Ionic Compounds: Periodic Trends and Bonding

Covalent Bonding and Electron-Dot Structures

Covalent Compounds: Bonding Theories and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids, solids, and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Nuclear Chemistry

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

The Main-Group Elements

Connections to Organic and Biological Chemistry

Filters

In the galvanic cell represented by the shorthand notation Al(s)|Al³⁺(aq)||Fe³⁺(aq)|Fe(s) the anode is and the cathode is .

For the galvanic cell reaction,expressed below using shorthand notation,what half-reaction occurs at the cathode? Zn(s)∣ Zn²⁺(aq)∣∣ Ni²⁺(aq)∣ Ni(s)

What is the relationship between the standard cell potentials,E°,for the following two galvanic cell reactions? I.3 Cu²⁺⁽^aq)+ 2 Al(s)→ 3 Cu(s)+ 2 Al³⁺(aq) II.30 Cu²⁺⁽^aq)+ 22 Al(s)→ 30 Cu(s)+ 22 Al³⁺(aq)

What is the standard cell potential for the reaction below? Pb(s)+ Br₂(l)→ Pb²⁺(aq)+ 2 Br^-(aq) The standard reduction potential is -0.13 V for the Pb²⁺/Pb half-cell and +1.09 V for the Br₂/Br^- half-cell.

A galvanic cell employs the reaction Ni²⁺(aq)+ Cu(s)→ Ni(s)+ Cu²⁺(aq) And KNO₃ is the salt used in the salt bridge.During the course of the reaction

The cell reaction for a lead storage battery is: Pb(s)+ PbO₂(s)+ 2 H⁺(aq)+ 2 HSO₄^-(aq)→ 2 PbSO₄(s)+ 2 H₂O(l) E° = +1.92 V To provide a potential of about 12 V,one could

Consider the following standard reduction potentials, Al³⁺(aq)+ 3 e^- → Al(s)E° = -1.66 V I₂(s)+ 2 e^- → 2 I^-(aq)E° = +0.54 V Under standard conditions,

Based on the half-reactions and their respective standard reduction potentials below,the strongest reducing agent is ,and the strongest oxidizing agent is . Fe³⁺(aq)+ e^- → Fe²⁺(aq)0.77 V Cu²⁺(aq)+ 2 e^- → Cu(aq)0.15 V Zn²⁺(aq)+ 2 e^- → Zn(s)-0.76 V

For the hypothetical reaction A + B^x → A^x + B,E° = 1.30 V and ΔG° = -251 kJ.For this reaction the value of x = ________.

What is the oxidation half reaction in the following chemical reaction? Mn(s)+ 2 H⁺(aq)→ Mn²⁺(aq)+ H₂(g)

What is the balanced equation for the galvanic cell reaction expressed using shorthand notation below? Pt(s)|Sn²⁺(aq)|Sn⁴⁺(aq)∣∣Cl₂(l)|Cl^-(aq)|Pt(s)

Given that E° = +0.897 V,calculate E at 25°C for Pb(s)∣ Pb²⁺(0.0400 M)∣∣ Fe³⁺(0.200 M),Fe²⁺(0.0100 M)∣ Pt(s)

When the equation below is balanced in acidic solution using the smallest whole numbers,the coefficient in front of the H₂O(l)is ________. Fe²⁺(aq)+ BrO₃^-(aq)→ Fe³⁺(aq)+ Br^-(aq)