Question 1

For the galvanic cell reaction,expressed below using shorthand notation,what half-reaction occurs at the cathode? Zn(s)∣ Zn2+(aq)∣∣ Pb2+(aq)∣ Pb(s)

Accepted Answer

A) Zn(s)→ Zn2+(aq)+ 2 e- 
B) Zn2+(aq)+ 2 e- → Zn(s) 
C) Pb(s)→ Pb2+(aq)+ 2 e- 
D) Pb2+(aq)+ 2 e- → Pb(s) 
A) Zn(s)→ Zn2+(aq)+ 2 e- 
B) Zn2+(aq)+ 2 e- → Zn(s) 
C) Pb(s)→ Pb2+(aq)+ 2 e- 
D) Pb2+(aq)+ 2 e- → Pb(s)

Question 2

How many grams of nickel metal are plated out when a constant current of 15.0 A is passed through aqueous NiCl2 for 80.0 minutes?

Accepted Answer

A) 14.7 g 
B) 21.9 g 
C) 43.8 g 
D) 48.4 g 
A) 14.7 g 
B) 21.9 g 
C) 43.8 g 
D) 48.4 g

Question 3

When a cell reaction reaches equilibrium,

Accepted Answer

A) E° = 0. 
B) E = 0. 
C) both E° and E = 0. 
D) neither E° nor E = 0. 
A) E° = 0. 
B) E = 0. 
C) both E° and E = 0. 
D) neither E° nor E = 0.

Question 4

What is the reduction half reaction for the following chemical reaction in a basic solution? Ge2+(aq)+ 2 ClO3-(aq)+ OH-(aq)→ GeO2(s)+ 2 ClO2(aq)+ H2O(l)

Accepted Answer

A) Ge2+(aq)+ 4 OH-(aq)→ GeO2(s)+ 2 H2O(l)+ 2e- 
B) Ge2+(aq)+ 2 H2O(l)→ GeO2(s)+ 4 H+(aq)+ 2e- 
C) ClO3-(aq)+ H2O(l)+ e- → ClO2(aq)+ 2 OH-(aq) 
D) ClO3-(aq)+ 2 H+(aq)+ e- → ClO2(aq)+ H2O(l) 
A) Ge2+(aq)+ 4 OH-(aq)→ GeO2(s)+ 2 H2O(l)+ 2e- 
B) Ge2+(aq)+ 2 H2O(l)→ GeO2(s)+ 4 H+(aq)+ 2e- 
C) ClO3-(aq)+ H2O(l)+ e- → ClO2(aq)+ 2 OH-(aq) 
D) ClO3-(aq)+ 2 H+(aq)+ e- → ClO2(aq)+ H2O(l)

Question 5

The standard reduction potential E° = -0.45 V for the half-reaction Fe2+ + 2 e- → Fe.If the measured cell potential at 25°C is 0.35 V,the pH in the anode compartment of the following cell is ________.
Pt(s)|H2(1 atm)|H+(? M)||Fe2+(1 M)|Fe(s)

Accepted Answer

Question 6

What is the shorthand notation for a galvanic cell that represents the following galvanic cell reaction? Br2(l)+ 2 I-(aq)→ 2 Br-(aq)+ I2(s)

Accepted Answer

A) I-(aq)|I2(s)∣∣Br2(l)|Br-(aq) 
B) I-(aq)|I2(s)∣∣Br2(l)|Br-(aq)|Pt(s) 
C) Pt(s)|I-(aq)|I2(s)∣∣Br2(l)|Br-(aq) 
D) Pt(s)|I-(aq)|I2(s)∣∣Br2(l)|Br-(aq)}Pt(s) 
A) I-(aq)|I2(s)∣∣Br2(l)|Br-(aq) 
B) I-(aq)|I2(s)∣∣Br2(l)|Br-(aq)|Pt(s) 
C) Pt(s)|I-(aq)|I2(s)∣∣Br2(l)|Br-(aq) 
D) Pt(s)|I-(aq)|I2(s)∣∣Br2(l)|Br-(aq)}Pt(s)

Question 7

Determine the number of water molecules necessary to balance the reduction half reaction of   that occurs in an acidic solution.

Accepted Answer

A) 1 
B) 3 
C) 5 
D) 7 
A) 1 
B) 3 
C) 5 
D) 7

Question 8

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 [Fe2+] concentration 
B) increase the [Pb2+] concentration 
C) increase the mass of Fe(s) 
D) decrease the mass of Fe(s) 
A) increase the [Fe2+] concentration 
B) increase the [Pb2+] concentration 
C) increase the mass of Fe(s) 
D) decrease the mass of Fe(s)

Question 9

What is the balanced equation for the galvanic cell reaction expressed using shorthand notation below? Mg(s)∣ Mg2+(aq)∣∣ Cl2(g)∣ Cl-(aq)∣ C(s)

Accepted Answer

A) Mg(s)+ 2 Cl-(aq)→ Mg2+(aq)+ Cl2(g) 
B) Mg(s)+ Cl2(g)→ Mg2+(aq)+ 2 Cl-(aq) 
C) Mg2+(aq)+ 2 Cl-(aq)→ Mg(s)+ Cl2(g) 
D) Mg2+(aq)+ 2 Cl-(aq)→ MgCl2(s) 
A) Mg(s)+ 2 Cl-(aq)→ Mg2+(aq)+ Cl2(g) 
B) Mg(s)+ Cl2(g)→ Mg2+(aq)+ 2 Cl-(aq) 
C) Mg2+(aq)+ 2 Cl-(aq)→ Mg(s)+ Cl2(g) 
D) Mg2+(aq)+ 2 Cl-(aq)→ MgCl2(s)

Question 10

Which statement is true?

Accepted Answer

A) The cathode is positive for a galvanic cell and negative for an electrolytic cell. 
B) Electrons flow through the external circuit to the cathode in a galvanic cell and to the anode in an electrolytic cell. 
C) Oxidation occurs at the anode in a galvanic cell and at the cathode in an electrolytic cell. 
D) Oxidation occurs at the cathode in a galvanic cell and at the anode in an electrolytic cell. 
A) The cathode is positive for a galvanic cell and negative for an electrolytic cell. 
B) Electrons flow through the external circuit to the cathode in a galvanic cell and to the anode in an electrolytic cell. 
C) Oxidation occurs at the anode in a galvanic cell and at the cathode in an electrolytic cell. 
D) Oxidation occurs at the cathode in a galvanic cell and at the anode in an electrolytic cell.

Question 11

In order for a cell potential to be a standard cell potential,the concentration of all ions in solution must be ________ M,the partial pressures of all gaseous species must be ________ atm,and the temperature must be ________ K.

Accepted Answer

The answer of In order for a cell potential to...

Question 12

Reduction half-reactions with corresponding standard half-cell potentials are shown below.
Zn2+(aq)+ 2 e- → Zn(s)E° = - 0.76 V
Al3+(aq)+ 3 e- → Al(s)E° = - 1.66 V
The standard potential for the galvanic cell that uses these two half-reactions is ________ V.

Accepted Answer

Question 13

If a constant current of 1.50 × 108 A is passed through a molten mixture of aluminum oxide and cryolite for 4.00 hour ________ kg of aluminum can be produced.

Accepted Answer

Question 14

-Is the cell shown above a galvanic or an electrolytic cell? What is the direction of ion flow?

Accepted Answer

A) Electrolytic cell;Cu2+ ions flow toward electrode x and SO42- ions flow toward electrode y. 
B) Electrolytic cell;Cu2+ ions flow toward electrode y and SO42- ions flow toward electrode x. 
C) Galvanic cell;Cu2+ ions flow toward electrode x and SO42- ions flow toward electrode y. 
D) Galvanic cell;Cu2+ ions flow toward electrode y and SO42- ions flow toward electrode x. 
A) Electrolytic cell;Cu2+ ions flow toward electrode x and SO42- ions flow toward electrode y. 
B) Electrolytic cell;Cu2+ ions flow toward electrode y and SO42- ions flow toward electrode x. 
C) Galvanic cell;Cu2+ ions flow toward electrode x and SO42- ions flow toward electrode y. 
D) Galvanic cell;Cu2+ ions flow toward electrode y and SO42- ions flow toward electrode x.

Question 15

The cell reaction for a dry cell battery is Zn(s)+ 2 MnO2(s)+ 2 NH4+(aq)→ 2 NH3(aq)+ Mn2O3(s)+ Zn2+(aq)+ H2O(l).
The standard cell potential for this cell is 1.56 V.What is the standard free energy change for this cell?

Accepted Answer

A) +151 kJ 
B) -151 kJ 
C) -301 kJ 
D) -602 kJ 
A) +151 kJ 
B) -151 kJ 
C) -301 kJ 
D) -602 kJ

Question 16

For a particular battery based on one of the following reactions,E is expected to remain constant with time until the cell reactants are almost completely consumed.Which is the appropriate reaction?

Accepted Answer

A) Zn(s)+ 2 MnO2(s)+ 2 NH4+(aq)→ 2 NH3(aq)+ Mn2O3(s)+ Zn2+(aq)+ H2O(l) 
B) 2 NiO(OH)(s)+ Cd(s)+ 2 H2O(l)→ 2 Ni(OH)2(s)+ Cd(OH)2(s) 
C) Pb(s)+ PbO2(s)+ 2 H+(aq)+ 2 HSO4-(aq)→ 2 PbSO4(s)+ 2 H2O(l) 
D) Zn(s)+ Cu2+(aq)→ Zn2+(aq)+ Cu(s) 
A) Zn(s)+ 2 MnO2(s)+ 2 NH4+(aq)→ 2 NH3(aq)+ Mn2O3(s)+ Zn2+(aq)+ H2O(l) 
B) 2 NiO(OH)(s)+ Cd(s)+ 2 H2O(l)→ 2 Ni(OH)2(s)+ Cd(OH)2(s) 
C) Pb(s)+ PbO2(s)+ 2 H+(aq)+ 2 HSO4-(aq)→ 2 PbSO4(s)+ 2 H2O(l) 
D) Zn(s)+ Cu2+(aq)→ Zn2+(aq)+ Cu(s)

Question 17

-Use Table 17.1 to determine which of the following is the best oxidizing agent.

Accepted Answer

A) Fe3+ 
B) Cl2 
C) MnO4- 
D) Zn2+ 
A) Fe3+ 
B) Cl2 
C) MnO4- 
D) Zn2+

Question 18

What is the shorthand notation that represents the following galvanic cell reaction? 2 Fe2+(aq)+ Cl2(g)→ 2 Fe3+(aq)+ 2 Cl-(aq)

Accepted Answer

A) Fe2+(aq)∣ Fe3+(aq)∣∣ Cl2(g)∣ Cl-(aq) 
B) Fe(s)∣ Fe2+(aq)∣∣ Fe3+(aq)Cl2(g)∣ Cl-(aq)∣ C(s) 
C) Pt(s)∣ Fe3+(aq),Fe2+(aq),Cl2(g)∣∣ Cl-(aq)∣ C(s) 
D) Pt(s)∣ Fe2+(aq),Fe3+(aq)∣∣ Cl2(g)∣ Cl-(aq)∣ C(s) 
A) Fe2+(aq)∣ Fe3+(aq)∣∣ Cl2(g)∣ Cl-(aq) 
B) Fe(s)∣ Fe2+(aq)∣∣ Fe3+(aq)Cl2(g)∣ Cl-(aq)∣ C(s) 
C) Pt(s)∣ Fe3+(aq),Fe2+(aq),Cl2(g)∣∣ Cl-(aq)∣ C(s) 
D) Pt(s)∣ Fe2+(aq),Fe3+(aq)∣∣ Cl2(g)∣ Cl-(aq)∣ C(s)

Question 19

An electrolytic cell is

Accepted Answer

A) a battery. 
B) a cell in which the cell reaction is spontaneous. 
C) a cell in which an electric current drives a nonspontaneous reaction. 
D) a cell in which reactants are continuously supplied to the cell. 
A) a battery. 
B) a cell in which the cell reaction is spontaneous. 
C) a cell in which an electric current drives a nonspontaneous reaction. 
D) a cell in which reactants are continuously supplied to the cell.

Question 20

How many grams of chromium metal are plated out when a constant current of 8.00 A is passed through an aqueous solution containing Cr3+ ions for 160.minutes?

Accepted Answer

A) 13.8 g 
B) 24.6 g 
C) 41.2 g 
D) 124 g 
A) 13.8 g 
B) 24.6 g 
C) 41.2 g 
D) 124 g

Exam 18: Electrochemistry

For the galvanic cell reaction,expressed below using shorthand notation,what half-reaction occurs at the cathode? Zn(s)∣ Zn2+(aq)∣∣ Pb2+(aq)∣ Pb(s)

How many grams of nickel metal are plated out when a constant current of 15.0 A is passed through aqueous NiCl2 for 80.0 minutes?

When a cell reaction reaches equilibrium,

What is the reduction half reaction for the following chemical reaction in a basic solution? Ge2+(aq)+ 2 ClO3-(aq)+ OH-(aq)→ GeO2(s)+ 2 ClO2(aq)+ H2O(l)

The standard reduction potential E° = -0.45 V for the half-reaction Fe2+ + 2 e- → Fe.If the measured cell potential at 25°C is 0.35 V,the pH in the anode compartment of the following cell is ________. Pt(s)|H2(1 atm)|H+(? M)||Fe2+(1 M)|Fe(s)

What is the shorthand notation for a galvanic cell that represents the following galvanic cell reaction? Br2(l)+ 2 I-(aq)→ 2 Br-(aq)+ I2(s)

Determine the number of water molecules necessary to balance the reduction half reaction of that occurs in an acidic solution.

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)?

What is the balanced equation for the galvanic cell reaction expressed using shorthand notation below? Mg(s)∣ Mg2+(aq)∣∣ Cl2(g)∣ Cl-(aq)∣ C(s)

Which statement is true?

In order for a cell potential to be a standard cell potential,the concentration of all ions in solution must be ________ M,the partial pressures of all gaseous species must be ________ atm,and the temperature must be ________ K.

Reduction half-reactions with corresponding standard half-cell potentials are shown below. Zn2+(aq)+ 2 e- → Zn(s)E° = - 0.76 V Al3+(aq)+ 3 e- → Al(s)E° = - 1.66 V The standard potential for the galvanic cell that uses these two half-reactions is ________ V.

If a constant current of 1.50 × 108 A is passed through a molten mixture of aluminum oxide and cryolite for 4.00 hour ________ kg of aluminum can be produced.

-Is the cell shown above a galvanic or an electrolytic cell? What is the direction of ion flow?

The cell reaction for a dry cell battery is Zn(s)+ 2 MnO2(s)+ 2 NH4+(aq)→ 2 NH3(aq)+ Mn2O3(s)+ Zn2+(aq)+ H2O(l). The standard cell potential for this cell is 1.56 V.What is the standard free energy change for this cell?

For a particular battery based on one of the following reactions,E is expected to remain constant with time until the cell reactants are almost completely consumed.Which is the appropriate reaction?

-Use Table 17.1 to determine which of the following is the best oxidizing agent.

What is the shorthand notation that represents the following galvanic cell reaction? 2 Fe2+(aq)+ Cl2(g)→ 2 Fe3+(aq)+ 2 Cl-(aq)

An electrolytic cell is

How many grams of chromium metal are plated out when a constant current of 8.00 A is passed through an aqueous solution containing Cr3+ ions for 160.minutes?

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For the galvanic cell reaction,expressed below using shorthand notation,what half-reaction occurs at the cathode? Zn(s)∣ Zn²⁺(aq)∣∣ Pb²⁺(aq)∣ Pb(s)

How many grams of nickel metal are plated out when a constant current of 15.0 A is passed through aqueous NiCl₂ for 80.0 minutes?

What is the reduction half reaction for the following chemical reaction in a basic solution? Ge²⁺(aq)+ 2 ClO₃^-(aq)+ OH^-(aq)→ GeO₂(s)+ 2 ClO₂(aq)+ H₂O(l)

The standard reduction potential E° = -0.45 V for the half-reaction Fe²⁺ + 2 e^- → Fe.If the measured cell potential at 25°C is 0.35 V,the pH in the anode compartment of the following cell is ________. Pt(s)|H₂(1 atm)|H⁺(? M)||Fe²⁺(1 M)|Fe(s)

What is the shorthand notation for a galvanic cell that represents the following galvanic cell reaction? Br₂(l)+ 2 I^-(aq)→ 2 Br^-(aq)+ I₂(s)

What is the balanced equation for the galvanic cell reaction expressed using shorthand notation below? Mg(s)∣ Mg²⁺(aq)∣∣ Cl₂(g)∣ Cl^-(aq)∣ C(s)

In order for a cell potential to be a standard cell potential,the concentration of all ions in solution must be M,the partial pressures of all gaseous species must be atm,and the temperature must be K.

Reduction half-reactions with corresponding standard half-cell potentials are shown below. Zn²⁺(aq)+ 2 e^-→ Zn(s)E° = - 0.76 V Al³⁺(aq)+ 3 e^-→ Al(s)E° = - 1.66 V The standard potential for the galvanic cell that uses these two half-reactions is ________ V.

If a constant current of 1.50 × 10⁸ A is passed through a molten mixture of aluminum oxide and cryolite for 4.00 hour ________ kg of aluminum can be produced.

The cell reaction for a dry cell battery is Zn(s)+ 2 MnO₂(s)+ 2 NH₄⁺(aq)→ 2 NH₃(aq)+ Mn₂O₃(s)+ Zn²⁺(aq)+ H₂O(l). The standard cell potential for this cell is 1.56 V.What is the standard free energy change for this cell?

What is the shorthand notation that represents the following galvanic cell reaction? 2 Fe²⁺(aq)+ Cl₂(g)→ 2 Fe³⁺(aq)+ 2 Cl^-(aq)

How many grams of chromium metal are plated out when a constant current of 8.00 A is passed through an aqueous solution containing Cr³⁺ ions for 160.minutes?