Question 1

What is E°cell for the following reaction? Al(s)+ 3Ag+(aq)→ Al3+(aq)+ 3Ag(s)
Al3+(aq)+ 3e- →Al(s)E° = -1.66 V
Ag+(aq)+ e- →Ag(s)E° = 0.80 V

Accepted Answer

A) -2.46 V 
B) 0.86 V 
C) -0.86 V 
D) 2.46 V 
E) 4.06 V 
A) -2.46 V 
B) 0.86 V 
C) -0.86 V 
D) 2.46 V 
E) 4.06 V

Question 2

Which,if any,of the following metals would be capable of acting as a sacrificial anode when used with iron pipe?

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 3

Reduction occurs at the anode of a galvanic cell.

Accepted Answer

A) True 
 B)False

Question 4

Which metals may be oxidized by H+ under standard-state conditions? Ag+(aq)+ e- →Ag(s)E° = 0.80 V
Cu2+ (aq)+ 2e- →Cu(s)E° = 0.34 V
Sn2+(aq)+ 2e- →Sn(s)E° = -0.14 V
Zn2+(aq)+ 2e- →Zn(s)E° = -0.76 V

Accepted Answer

A) Ag,Cu,Sn,and Zn 
B) Ag and Cu 
C) Sn and Cu 
D) Zn and Cu 
E) Zn and Sn 
A) Ag,Cu,Sn,and Zn 
B) Ag and Cu 
C) Sn and Cu 
D) Zn and Cu 
E) Zn and Sn

Question 5

Which is the half-reaction at the anode in a lead storage battery?

Accepted Answer

A) Pb(s)+ PbO2(s)+ 4H+(aq)+ 2SO42-(aq)→ 2PbSO4(s)+ 2H2O(l) 
B) PbO2(s)+ 4H+(aq)+ 2SO42-(aq)+ 2e- → PbSO4(s)+ 2H2O(l) 
C) Pb(s)+ SO42-(aq)→ PbSO4(s)+ 2e- 
D) Pb(s)→ Pb(s)+ 2e- 
E) H2(g)→ 2H+(aq)+ 2e- 
A) Pb(s)+ PbO2(s)+ 4H+(aq)+ 2SO42-(aq)→ 2PbSO4(s)+ 2H2O(l) 
B) PbO2(s)+ 4H+(aq)+ 2SO42-(aq)+ 2e- → PbSO4(s)+ 2H2O(l) 
C) Pb(s)+ SO42-(aq)→ PbSO4(s)+ 2e- 
D) Pb(s)→ Pb(s)+ 2e- 
E) H2(g)→ 2H+(aq)+ 2e-

Question 6

When the following equation is balanced with the lowest whole number coefficients,the coefficients are: Cu(s)+ H+(aq)+ NO3-(aq)→ NO(g)+ H2O(l)+ Cu2+(aq)

Accepted Answer

A) 1,2,1,1,1,1 
B) 3,2,1,1,1,3 
C) 3,2,4,2,4,3 
D) 1,8,2,2,4,1 
E) 3,8,2,2,4,3 
A) 1,2,1,1,1,1 
B) 3,2,1,1,1,3 
C) 3,2,4,2,4,3 
D) 1,8,2,2,4,1 
E) 3,8,2,2,4,3

Question 7

Which equation is correct?

Accepted Answer

A) Ecell = RT lnK 
B) ΔG = -nFEcell 
C) Ecell = -RT lnK 
D) K = E°cell/nRT 
E) E°cell = -nFlnK 
A) Ecell = RT lnK 
B) ΔG = -nFEcell 
C) Ecell = -RT lnK 
D) K = E°cell/nRT 
E) E°cell = -nFlnK

Question 8

What is the name given to the apparatus that connects the two solutions by a conducting medium through which the cations and anions can move from one half-cell to the other?

Accepted Answer

A) Cathode 
B) Electrode 
C) Galvanic cell 
D) Salt bridge 
E) Fuel cell 
A) Cathode 
B) Electrode 
C) Galvanic cell 
D) Salt bridge 
E) Fuel cell

Question 9

Based on the following electrochemical cell,which statement is true?   Half-Reaction E° (V) Al3+(aq)+ 3e- → Al(s)-1.66
Cd2+(aq)+ 2e- → Cd(s)-0.40

Accepted Answer

A) Al(s)is oxidized and is the anode. 
B) Al(s)is oxidized and is the cathode. 
C) Cd(s)is oxidized and is the anode. 
D) Cd(s)is oxidized and is the cathode. 
E) No reaction occurs because E°cell < 0. 
A) Al(s)is oxidized and is the anode. 
B) Al(s)is oxidized and is the cathode. 
C) Cd(s)is oxidized and is the anode. 
D) Cd(s)is oxidized and is the cathode. 
E) No reaction occurs because E°cell < 0.

Question 10

What mass of oxygen gas is produced in the electrolysis of water,for every gram of hydrogen gas formed? Reaction: 2H2O(l)→ 2H2(g)+ O2(g)

Accepted Answer

A) 32 g O2 
B) 16 g O2 
C) 64 g O2 
D) 20 g O2 
E) 8 g O2 
A) 32 g O2 
B) 16 g O2 
C) 64 g O2 
D) 20 g O2 
E) 8 g O2

Question 11

For E° and ΔG° the zero (superscript)represents the standard state.What is the standard state?

Accepted Answer

For gases,partial pr

Question 12

Given the following standard reduction potentials, Ag+(aq)+ e- → Ag(s)E° = +0.80 V
AgCN(s)+ e- → Ag(s)+ CN-(aq)E° = -0.01 V
Calculate the solubility product of AgCN at 25°C.

Accepted Answer

A) 4.3 × 10-14 
B) 2.3 × 1013 
C) 2.1 × 10-14 
D) 5.1 × 1013 
E) None of these choices is correct. 
A) 4.3 × 10-14 
B) 2.3 × 1013 
C) 2.1 × 10-14 
D) 5.1 × 1013 
E) None of these choices is correct.

Question 13

How much charge must pass through an electrolytic cell to reduce 0.44 mol Ca2+ ion to calcium metal?

Accepted Answer

A) 1.9 ×105 C 
B) 8.5 ×104 C 
C) 2.1 ×104 C 
D) 4.3 ×104 C 
E) 0.88 C 
A) 1.9 ×105 C 
B) 8.5 ×104 C 
C) 2.1 ×104 C 
D) 4.3 ×104 C 
E) 0.88 C

Question 14

When the following redox equation is balanced with the smallest whole number coefficients,what is the coefficient of Zn(s)? Zn(s)+ ReO4-(aq)→ Re(s)+ Zn2+(aq) (acidic solution)

Accepted Answer

A) 2 
B) 7 
C) 8 
D) 16 
E) None of these choices is correct. 
A) 2 
B) 7 
C) 8 
D) 16 
E) None of these choices is correct.

Question 15

A certain electrochemical cell has for its cell reaction: Zn + HgO → ZnO + Hg
Which is the half-reaction occurring at the anode?

Accepted Answer

A) HgO + 2e- → Hg + O2- 
B) Zn2++ 2e- → Zn 
C) Zn → Zn2+ + 2e- 
D) ZnO + 2e- → Zn 
A) HgO + 2e- → Hg + O2- 
B) Zn2++ 2e- → Zn 
C) Zn → Zn2+ + 2e- 
D) ZnO + 2e- → Zn

Question 16

How many faradays are transferred in an electrolytic cell when a current of 2.0 A flows for 12 hours? (1 faraday = 96,500 C)

Accepted Answer

A) 24 faradays 
B) 8.6 × 104 faradays 
C) 0.90 faradays 
D) 6.2 × 10-3 faradays 
E) 1.1 faradays 
A) 24 faradays 
B) 8.6 × 104 faradays 
C) 0.90 faradays 
D) 6.2 × 10-3 faradays 
E) 1.1 faradays

Question 17

Which of the following elements could be prepared by electrolysis of the aqueous solution shown?

Accepted Answer

A) Sodium from Na3PO4(aq) 
B) Sulfur from K2SO4(aq) 
C) Oxygen from H2SO4(aq) 
D) Potassium from KCl(aq) 
E) Nitrogen from AgNO3(aq) 
A) Sodium from Na3PO4(aq) 
B) Sulfur from K2SO4(aq) 
C) Oxygen from H2SO4(aq) 
D) Potassium from KCl(aq) 
E) Nitrogen from AgNO3(aq)

Question 18

What is the name given to the experimental apparatus for generating electricity through the use of a spontaneous reaction?

Accepted Answer

A) Electrolytic cell 
B) Galvanic cell 
C) Redox cell 
D) Cathode 
E) Anode 
A) Electrolytic cell 
B) Galvanic cell 
C) Redox cell 
D) Cathode 
E) Anode

Question 19

Electrons flow to the cathode in a voltaic cell.

Accepted Answer

A) True 
 B)False

Question 20

What is the half-reaction that occurs at the cathode during the electrolysis of an aqueous sodium iodide solution? Half-Reaction E° (V)
2H2O(l)+ 2e- → H2(g)+2OH-(aq)-0.83
O2(g)+ 4H+(aq)+ 4e- →2H2O(l)+1.23
Na+(aq)+ e- → Na(s)-2.71
I2(s)+ 2e- → 2I-(aq)+0.53

Accepted Answer

A) Na+ + e- → 
B) O2(g)+ 4H+(aq)+ 4e- → 2H2O(l) 
C) 2H2O + 2e- → H2 + 2OH- 
D) I2 + 2e- → 2I- 
E) 2I- → I2 + 2e- 
A) Na+ + e- → 
B) O2(g)+ 4H+(aq)+ 4e- → 2H2O(l) 
C) 2H2O + 2e- → H2 + 2OH- 
D) I2 + 2e- → 2I- 
E) 2I- → I2 + 2e-

Exam 19: Electrochemistry

What is E°cell for the following reaction? Al(s)+ 3Ag+(aq)→ Al3+(aq)+ 3Ag(s) Al3+(aq)+ 3e- →Al(s)E° = -1.66 V Ag+(aq)+ e- →Ag(s)E° = 0.80 V

Which,if any,of the following metals would be capable of acting as a sacrificial anode when used with iron pipe?

Reduction occurs at the anode of a galvanic cell.

Which metals may be oxidized by H+ under standard-state conditions? Ag+(aq)+ e- →Ag(s)E° = 0.80 V Cu2+ (aq)+ 2e- →Cu(s)E° = 0.34 V Sn2+(aq)+ 2e- →Sn(s)E° = -0.14 V Zn2+(aq)+ 2e- →Zn(s)E° = -0.76 V

Which is the half-reaction at the anode in a lead storage battery?

When the following equation is balanced with the lowest whole number coefficients,the coefficients are: Cu(s)+ H+(aq)+ NO3-(aq)→ NO(g)+ H2O(l)+ Cu2+(aq)

Which equation is correct?

What is the name given to the apparatus that connects the two solutions by a conducting medium through which the cations and anions can move from one half-cell to the other?

Based on the following electrochemical cell,which statement is true? Half-Reaction E° (V) Al3+(aq)+ 3e- → Al(s)-1.66 Cd2+(aq)+ 2e- → Cd(s)-0.40

What mass of oxygen gas is produced in the electrolysis of water,for every gram of hydrogen gas formed? Reaction: 2H2O(l)→ 2H2(g)+ O2(g)

For E° and ΔG° the zero (superscript)represents the standard state.What is the standard state?

Given the following standard reduction potentials, Ag+(aq)+ e- → Ag(s)E° = +0.80 V AgCN(s)+ e- → Ag(s)+ CN-(aq)E° = -0.01 V Calculate the solubility product of AgCN at 25°C.

How much charge must pass through an electrolytic cell to reduce 0.44 mol Ca2+ ion to calcium metal?

When the following redox equation is balanced with the smallest whole number coefficients,what is the coefficient of Zn(s)? Zn(s)+ ReO4-(aq)→ Re(s)+ Zn2+(aq) (acidic solution)

A certain electrochemical cell has for its cell reaction: Zn + HgO → ZnO + Hg Which is the half-reaction occurring at the anode?

How many faradays are transferred in an electrolytic cell when a current of 2.0 A flows for 12 hours? (1 faraday = 96,500 C)

Which of the following elements could be prepared by electrolysis of the aqueous solution shown?

What is the name given to the experimental apparatus for generating electricity through the use of a spontaneous reaction?

Electrons flow to the cathode in a voltaic cell.

What is the half-reaction that occurs at the cathode during the electrolysis of an aqueous sodium iodide solution? Half-Reaction E° (V) 2H2O(l)+ 2e- → H2(g)+2OH-(aq)-0.83 O2(g)+ 4H+(aq)+ 4e- →2H2O(l)+1.23 Na+(aq)+ e- → Na(s)-2.71 I2(s)+ 2e- → 2I-(aq)+0.53

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Filters

What is E°_cell for the following reaction? Al(s)+ 3Ag⁺(aq)→ Al³⁺(aq)+ 3Ag(s) Al³⁺(aq)+ 3e^- →Al(s)E° = -1.66 V Ag⁺(aq)+ e^- →Ag(s)E° = 0.80 V

Which metals may be oxidized by H⁺ under standard-state conditions? Ag⁺(aq)+ e^- →Ag(s)E° = 0.80 V Cu²⁺ (aq)+ 2e^- →Cu(s)E° = 0.34 V Sn²⁺(aq)+ 2e^- →Sn(s)E° = -0.14 V Zn²⁺(aq)+ 2e^- →Zn(s)E° = -0.76 V

When the following equation is balanced with the lowest whole number coefficients,the coefficients are: Cu(s)+ H⁺(aq)+ NO₃^-(aq)→ NO(g)+ H₂O(l)+ Cu²⁺(aq)

Based on the following electrochemical cell,which statement is true? Half-Reaction E° (V) Al³⁺(aq)+ 3e^- → Al(s)-1.66 Cd²⁺(aq)+ 2e^- → Cd(s)-0.40

What mass of oxygen gas is produced in the electrolysis of water,for every gram of hydrogen gas formed? Reaction: 2H₂O(l)→ 2H₂(g)+ O₂(g)

Given the following standard reduction potentials, Ag⁺(aq)+ e^- → Ag(s)E° = +0.80 V AgCN(s)+ e^- → Ag(s)+ CN^-(aq)E° = -0.01 V Calculate the solubility product of AgCN at 25°C.

How much charge must pass through an electrolytic cell to reduce 0.44 mol Ca²⁺ ion to calcium metal?

When the following redox equation is balanced with the smallest whole number coefficients,what is the coefficient of Zn(s)? Zn(s)+ ReO₄^-(aq)→ Re(s)+ Zn²⁺(aq) (acidic solution)

What is the half-reaction that occurs at the cathode during the electrolysis of an aqueous sodium iodide solution? Half-Reaction E° (V) 2H₂O(l)+ 2e^- → H₂(g)+2OH^-(aq)-0.83 O₂(g)+ 4H⁺(aq)+ 4e^- →2H₂O(l)+1.23 Na⁺(aq)+ e^- → Na(s)-2.71 I₂(s)+ 2e^- → 2I^-(aq)+0.53