Question 1

What is the name given to the apparatus where reduction occurs in a cell where electricity flows?

Accepted Answer

A) Cathode 
B) Electrode 
C) Galvanic cell 
D) Anode 
E) Voltaic cell 
A) Cathode 
B) Electrode 
C) Galvanic cell 
D) Anode 
E) Voltaic cell A

Question 2

Based on the data presented below,which is the strongest reducing agent? PbI2(s)+ 2e-   Pb(s)+2I-(aq)E° = -0.365 V
Ca2+(aq)+ 2e-   Ca(s)E° = -2.868 V
Pt2+(aq)+ 2e-   Pt(s)E° = 1.18 V
Br2(l)+ 2e-   2Br-(aq)E° = 1.066 V

Accepted Answer

A) Pb(s) 
B) Ca(s) 
C) Pt(s) 
D) Br-(aq) 
E) Pt2+(aq) 
A) Pb(s) 
B) Ca(s) 
C) Pt(s) 
D) Br-(aq) 
E) Pt2+(aq) B

Question 3

What is E°cell for the following reaction? 2 Ag(s)+ Sn2+(aq)→ 2 Ag+(aq)+ Sn(s)
Ag+(aq)+ e- → Ag(s)E° = 0.80 V
Sn4+(aq)+ 2e? →Sn2+(aq)E° = 0.13 V
Sn2+(aq)+ 2e- → Sn(s)E° = -0.14 V

Accepted Answer

A) +0.94 V 
B) -0.94 V 
C) +0.67 V 
D) -0.67 V 
E) +1.34 V 
A) +0.94 V 
B) -0.94 V 
C) +0.67 V 
D) -0.67 V 
E) +1.34 V B

Question 4

What is ΔG° at 298 K for the following reaction? (F = 96,500 C • mol-1) 2Cr3+(aq)+ 6Hg(l)→ 2Cr(s)+ 3Hg22+(aq)E°cell = 1.59V

Accepted Answer

A) -921 kJ/mol 
B) -767 kJ/mol 
C) -460 kJ/mol 
D) -307 kJ/mol 
E) -1840 kJ/mol 
A) -921 kJ/mol 
B) -767 kJ/mol 
C) -460 kJ/mol 
D) -307 kJ/mol 
E) -1840 kJ/mol

Question 5

A voltaic cell consists of a Cd/Cd2+ electrode (E° = -0.40 V)and a Fe/Fe2+ electrode (E° = -0.44 V).If Ecell = 0 and the temperature is 25°C,what is the ratio [Fe2+]/[Cd2+]?

Accepted Answer

A) 2.3 × 101 
B) 1.0 × 101 
C) 1.0 
D) 1.0 × 10-1 
E) 5.0 × 10-2 
A) 2.3 × 101 
B) 1.0 × 101 
C) 1.0 
D) 1.0 × 10-1 
E) 5.0 × 10-2

Question 6

Aluminum does not corrode in the same manner as iron does,because

Accepted Answer

A) aluminum does not react with oxygen gas. 
B) a protective layer of aluminum oxide forms on the metal surface. 
C) aluminum is harder to oxidize than iron. 
D) iron gives cathodic protection to aluminum. 
E) the electrical circuit cannot be completed on an aluminum surface. 
A) aluminum does not react with oxygen gas. 
B) a protective layer of aluminum oxide forms on the metal surface. 
C) aluminum is harder to oxidize than iron. 
D) iron gives cathodic protection to aluminum. 
E) the electrical circuit cannot be completed on an aluminum surface.

Question 7

Based on the following electrochemical cell,what is the standard reduction potential of metal M at 298 K? (R = 8.314 J/K • mol,F = 96500 C/mol)   Half-Reaction E° (V) Fe2+(aq)+ 2e- → Fe(s)-0.44

Accepted Answer

A) -0.54 V 
B) +0.60 V 
C) -0.30 V 
D) +0.56 V 
E) -0.28 V 
A) -0.54 V 
B) +0.60 V 
C) -0.30 V 
D) +0.56 V 
E) -0.28 V

Question 8

Which equation is correct?

Accepted Answer

A) E = -(RT/nF)lnK 
B) E° = (RT/nF)lnK 
C) E° = (RT/nF)lnQ 
D) E = -(RT/nF)lnQ 
E) E = E° + lnQ 
A) E = -(RT/nF)lnK 
B) E° = (RT/nF)lnK 
C) E° = (RT/nF)lnQ 
D) E = -(RT/nF)lnQ 
E) E = E° + lnQ

Question 9

If E° for X + e- → Y is larger than E° for A + 2e- → B,then in a spontaneous process under standard-state conditions,

Accepted Answer

A) X will oxidize A. 
B) Y will oxidize A. 
C) Y will reduce A. 
D) B will oxidize X. 
E) B will reduce X. 
A) X will oxidize A. 
B) Y will oxidize A. 
C) Y will reduce A. 
D) B will oxidize X. 
E) B will reduce X.

Question 10

Which electrochemical cell pictured below corresponds to the following cell diagram? Cr(s)| Cr3+(aq,1.0 M)|| Sn2+(aq,1.0 M)| Sn(s)

Accepted Answer

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

Question 11

Which is not a redox reaction?

Accepted Answer

A) Al(OH)4-(aq)+ 4H+(aq)→ Al3+(aq)+ 4H2O(l) 
B) C6H12O6(s)+ 6O2(g)→ 6CO2(g)+ 6H2O(l) 
C) Na6FeCl8(s)+ 2Na(l)→ 8NaCl(s)+ Fe(s) 
D) 2H2O2(aq)→ 2H2O(l)+ O2(g) 
E) CO2(g)+ H2(g)→ CO(g)+ H2O(g) 
A) Al(OH)4-(aq)+ 4H+(aq)→ Al3+(aq)+ 4H2O(l) 
B) C6H12O6(s)+ 6O2(g)→ 6CO2(g)+ 6H2O(l) 
C) Na6FeCl8(s)+ 2Na(l)→ 8NaCl(s)+ Fe(s) 
D) 2H2O2(aq)→ 2H2O(l)+ O2(g) 
E) CO2(g)+ H2(g)→ CO(g)+ H2O(g)

Question 12

A metal object is to be gold-plated by an electrolytic procedure using aqueous AuCl3 electrolyte.How much gold may be deposited in 3.0 min by a constant current of 10.A?

Accepted Answer

A) 6.2 × 10-3 mol 
B) 9.3 × 10-3 mol 
C) 1.8 × 10-2 mol 
D) 3.5 × 10-5 mol 
E) 1.6 × 102 mol 
A) 6.2 × 10-3 mol 
B) 9.3 × 10-3 mol 
C) 1.8 × 10-2 mol 
D) 3.5 × 10-5 mol 
E) 1.6 × 102 mol

Question 13

Given the following standard reduction potentials in acid solution
O2 + 4H+ + 4e- → 2H2O E° = +1.23V
Sn4+ + 2e- → Sn2+ E° = +0.13V
Zn2+ + 2e- → Zn(s)E° = -0.76V
write the formula of the strongest reducing agent.

Accepted Answer

Question 14

A voltaic cell consists of an Au/Au3+ electrode (E° = 1.50 V)and a Cu/ Cu2+ electrode (E° = 0.34 V).Calculate [Au3+] if [Cu2+] = 1.20 M and Ecell = 1.15 V at 25°C.

Accepted Answer

A) 0.0010 M 
B) 0.0020 M 
C) 0.010 M 
D) 0.020 M 
E) 0.41 M 
A) 0.0010 M 
B) 0.0020 M 
C) 0.010 M 
D) 0.020 M 
E) 0.41 M

Question 15

What mass of copper can be deposited by the passage of 12.0 A for 25.0 min through a solution of copper(II)sulfate? [1 C = 1 A•s; F = 96,500 C]

Accepted Answer

A) 5.93 g 
B) 3.95 g 
C) 1.97 g 
D) 11.85 g 
E) 29.6 g 
A) 5.93 g 
B) 3.95 g 
C) 1.97 g 
D) 11.85 g 
E) 29.6 g

Question 16

Which one of the following statements relating to the glass electrode is correct?

Accepted Answer

A) The glass electrode detects hydrogen gas. 
B) The glass of a glass electrode serves to conduct electrons. 
C) When pH is measured,only a single electrode,the glass electrode,need be used. 
D) The potential of the glass electrode varies linearly with the pH of the solution. 
E) None of these statements is correct. 
A) The glass electrode detects hydrogen gas. 
B) The glass of a glass electrode serves to conduct electrons. 
C) When pH is measured,only a single electrode,the glass electrode,need be used. 
D) The potential of the glass electrode varies linearly with the pH of the solution. 
E) None of these statements is correct.

Question 17

Based on the data presented below,which is the strongest oxidizing agent? Half-Reaction E°(V)
Al3++ 3e- → Al(s)-1.66
AgBr(s)+ e- → Ag(s)+ Br- +0.07
Sn4++ 2e- → Sn2+  +0.14
Fe3++ e- → Fe2+ +0.77

Accepted Answer

A) Fe3+ 
B) Fe2+ 
C) Br- 
D) Al3+ 
E) Al(s) 
A) Fe3+ 
B) Fe2+ 
C) Br- 
D) Al3+ 
E) Al(s)

Question 18

_______________ is a process used to coat iron in order to protect it from corrosion.

Accepted Answer

Galvanizat

Question 19

A SHE has the acid concentration of 1 M and the H2 pressure is 1 atm.

Accepted Answer

A) True 
 B)False

Question 20

A current of 250.A flows for 24.0 hours at an anode where the reaction occurring is as follows: Mn2+(aq)+ 2H2O(l)→ MnO2(s)+ 4H+(aq)+ 2e-
What mass of MnO2 is deposited at this anode?

Accepted Answer

A) 19.5 kg 
B) 12.9 kg 
C) 9.73 kg 
D) 4.87 kg 
E) 2.43 kg 
A) 19.5 kg 
B) 12.9 kg 
C) 9.73 kg 
D) 4.87 kg 
E) 2.43 kg

Exam 19: Electrochemistry

What is the name given to the apparatus where reduction occurs in a cell where electricity flows?

Based on the data presented below,which is the strongest reducing agent? PbI2(s)+ 2e- Pb(s)+2I-(aq)E° = -0.365 V Ca2+(aq)+ 2e- Ca(s)E° = -2.868 V Pt2+(aq)+ 2e- Pt(s)E° = 1.18 V Br2(l)+ 2e- 2Br-(aq)E° = 1.066 V

What is E°cell for the following reaction? 2 Ag(s)+ Sn2+(aq)→ 2 Ag+(aq)+ Sn(s) Ag+(aq)+ e- → Ag(s)E° = 0.80 V Sn4+(aq)+ 2e? →Sn2+(aq)E° = 0.13 V Sn2+(aq)+ 2e- → Sn(s)E° = -0.14 V

What is ΔG° at 298 K for the following reaction? (F = 96,500 C • mol-1) 2Cr3+(aq)+ 6Hg(l)→ 2Cr(s)+ 3Hg22+(aq)E°cell = 1.59V

A voltaic cell consists of a Cd/Cd2+ electrode (E° = -0.40 V)and a Fe/Fe2+ electrode (E° = -0.44 V).If Ecell = 0 and the temperature is 25°C,what is the ratio [Fe2+]/[Cd2+]?

Aluminum does not corrode in the same manner as iron does,because

Based on the following electrochemical cell,what is the standard reduction potential of metal M at 298 K? (R = 8.314 J/K • mol,F = 96500 C/mol) Half-Reaction E° (V) Fe2+(aq)+ 2e- → Fe(s)-0.44

Which equation is correct?

If E° for X + e- → Y is larger than E° for A + 2e- → B,then in a spontaneous process under standard-state conditions,

Which electrochemical cell pictured below corresponds to the following cell diagram? Cr(s)| Cr3+(aq,1.0 M)|| Sn2+(aq,1.0 M)| Sn(s)

Which is not a redox reaction?

A metal object is to be gold-plated by an electrolytic procedure using aqueous AuCl3 electrolyte.How much gold may be deposited in 3.0 min by a constant current of 10.A?

Given the following standard reduction potentials in acid solution O2 + 4H+ + 4e- → 2H2O E° = +1.23V Sn4+ + 2e- → Sn2+ E° = +0.13V Zn2+ + 2e- → Zn(s)E° = -0.76V write the formula of the strongest reducing agent.

A voltaic cell consists of an Au/Au3+ electrode (E° = 1.50 V)and a Cu/ Cu2+ electrode (E° = 0.34 V).Calculate [Au3+] if [Cu2+] = 1.20 M and Ecell = 1.15 V at 25°C.

What mass of copper can be deposited by the passage of 12.0 A for 25.0 min through a solution of copper(II)sulfate? [1 C = 1 A•s; F = 96,500 C]

Which one of the following statements relating to the glass electrode is correct?

Based on the data presented below,which is the strongest oxidizing agent? Half-Reaction E°(V) Al3++ 3e- → Al(s)-1.66 AgBr(s)+ e- → Ag(s)+ Br- +0.07 Sn4++ 2e- → Sn2+ +0.14 Fe3++ e- → Fe2+ +0.77

_______________ is a process used to coat iron in order to protect it from corrosion.

A SHE has the acid concentration of 1 M and the H2 pressure is 1 atm.

A current of 250.A flows for 24.0 hours at an anode where the reaction occurring is as follows: Mn2+(aq)+ 2H2O(l)→ MnO2(s)+ 4H+(aq)+ 2e- What mass of MnO2 is deposited at this anode?

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Based on the data presented below,which is the strongest reducing agent? PbI₂(s)+ 2e^- Pb(s)+2I^-(aq)E° = -0.365 V Ca²⁺(aq)+ 2e^- Ca(s)E° = -2.868 V Pt²⁺(aq)+ 2e^- Pt(s)E° = 1.18 V Br₂(l)+ 2e^- 2Br^-(aq)E° = 1.066 V

What is E°_cell for the following reaction? 2 Ag(s)+ Sn²⁺(aq)→ 2 Ag⁺(aq)+ Sn(s) Ag⁺(aq)+ e^- → Ag(s)E° = 0.80 V Sn⁴⁺(aq)+ 2e^? →Sn²⁺(aq)E° = 0.13 V Sn²⁺(aq)+ 2e^- → Sn(s)E° = -0.14 V

What is ΔG° at 298 K for the following reaction? (F = 96,500 C • mol^-1) 2Cr³⁺(aq)+ 6Hg(l)→ 2Cr(s)+ 3Hg₂²⁺(aq)E°_cell = 1.59V

A voltaic cell consists of a Cd/Cd²⁺ electrode (E° = -0.40 V)and a Fe/Fe²⁺ electrode (E° = -0.44 V).If E_cell = 0 and the temperature is 25°C,what is the ratio [Fe²⁺]/[Cd²⁺]?

Based on the following electrochemical cell,what is the standard reduction potential of metal M at 298 K? (R = 8.314 J/K • mol,F = 96500 C/mol) Half-Reaction E° (V) Fe²⁺(aq)+ 2e^- → Fe(s)-0.44

If E° for X + e^- → Y is larger than E° for A + 2e^- → B,then in a spontaneous process under standard-state conditions,

Which electrochemical cell pictured below corresponds to the following cell diagram? Cr(s)| Cr³⁺(aq,1.0 M)|| Sn²⁺(aq,1.0 M)| Sn(s)

A metal object is to be gold-plated by an electrolytic procedure using aqueous AuCl₃ electrolyte.How much gold may be deposited in 3.0 min by a constant current of 10.A?

Given the following standard reduction potentials in acid solution O₂ + 4H⁺ + 4e^- → 2H₂O E° = +1.23V Sn⁴⁺ + 2e^- → Sn²⁺ E° = +0.13V Zn²⁺ + 2e^- → Zn(s)E° = -0.76V write the formula of the strongest reducing agent.

A voltaic cell consists of an Au/Au³⁺ electrode (E° = 1.50 V)and a Cu/ Cu²⁺ electrode (E° = 0.34 V).Calculate [Au³⁺] if [Cu²⁺] = 1.20 M and E_cell = 1.15 V at 25°C.

Based on the data presented below,which is the strongest oxidizing agent? Half-Reaction E°(V) Al³⁺+ 3e^- → Al(s)-1.66 AgBr(s)+ e^- → Ag(s)+ Br^- +0.07 Sn⁴⁺+ 2e^- → Sn²⁺+0.14 Fe³⁺+ e^- → Fe²⁺ +0.77

A SHE has the acid concentration of 1 M and the H₂ pressure is 1 atm.

A current of 250.A flows for 24.0 hours at an anode where the reaction occurring is as follows: Mn²⁺(aq)+ 2H₂O(l)→ MnO₂(s)+ 4H⁺(aq)+ 2e^- What mass of MnO₂ is deposited at this anode?