Question 1

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.F) A) and E)
G) B) and D)

Question 2

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

Accepted Answer

For gases,partial pr...

Question 3

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 = -nFlnKF) A) and B)
G) A) and E)

Question 4

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-F) A) and C)
G) B) and D)

Question 5

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) F) B) and C)
G) A) and E)

Question 6

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 VF) C) and E)
G) B) and C)

Question 7

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)  AnodeF) B) and E)
G) B) and D)

Question 8

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)   F) C) and D)
G) None of the above

Question 9

Electrons flow to the cathode in a voltaic cell.

Accepted Answer

A) True 
 B)False

Question 10

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 SnF) C) and E)
G) None of the above

Question 11

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 CF) C) and D)
G) B) and D)

Question 12

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- → ZnE) B) and D)
F) A) and D)

Question 13

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.F) B) and D)
G) A) and C)

Question 14

Based on the following electrochemical cell,which statement is true? 3+(aq) + 3e- → Al(s) -1.66 Cd2+(aq) + 2e- → Cd(s) -0.40 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  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.F) A) and C)
G) A) and E)

Question 15

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-F) C) and E)
G) None of the above

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 faradaysF) D) and E)
G) A) and D)

Question 17

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 O2F) None of the above
G) A) and C)

Question 18

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 cellF) D) and E)
G) C) and E)

Question 19

Reduction occurs at the anode of a galvanic cell.

Accepted Answer

A) True 
 B)False

Question 20

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)  3,8,2,2,4,3F) B) and C)
G) A) and E)

Exam 19: Electrochemistry

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)

Correct AnswerverifiedShow Answer

Which equation is correct?

Correct AnswerverifiedShow Answer

Electrons flow to the cathode in a voltaic cell.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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)

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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)

Correct AnswerverifiedShow Answer

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?

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedFor gases,partial pr...View AnswerShow Answer

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

Correct AnswerverifiedShow Answer

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)

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

Reduction occurs at the anode of a galvanic cell.

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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

Correct AnswerverifiedShow Answer

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)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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.

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

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)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified
For gases,partial pr...
View Answer

Correct Answer
verified

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)

Correct Answer
verified

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

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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

Correct Answer
verified

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

Correct Answer
verified