Question 1

What element is being reduced in the following (unbalanced)redox reaction? Cr(OH)4⁻(aq)+ ClO⁻(aq)→ CrO42-(aq)+ Cl⁻(aq)

Accepted Answer

A)  Cr
B)  O
C)  H
D)  Cl D

Question 2

Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25 °C. (The equation is balanced.) Mg(s)+ Cu2+(aq)→ Cu(s)+ Mg2+(aq)
Mg2+(aq)+ 2 e⁻ → Mg(s) E° = -2.38 V
Cu2+(aq)+ 2 e⁻ → Cu(s) E° = +0.34 V

Accepted Answer

A)  +2.04 V
B)  -2.04 V
C)  +2.72 V
D)  -1.36 V
E)  +1.36 V C

Question 3

The standard emf for the cell using the overall cell reaction below is +0.48 V: Zn(s)+ Ni2+ (aq)→ Zn2+ (aq)+ Ni(s)
The emf generated by the cell when [Ni2+] = 2.50 mol L-1 and [Zn2+] = 0.100 mol L-1 is

Accepted Answer

A)  0.40
B)  0.50
C)  0.52
D)  0.56
E)  0.44 C

Question 4

Why is sugar water not a good conductor of current?

Accepted Answer

The answer of Why is sugar water not a good...

Question 5

What is the balanced equation for the galvanic cell reaction expressed using shorthand notation below? Ni(s)∣ Ni2+(aq)∣∣ Cl2(g)∣ Cl-(aq)∣ C(s)

Accepted Answer

A)  Ni(s) + 2Cl-(aq) → Ni2+(aq) + Cl2(g) 
B)  Ni(s) + Cl2(g) → Ni2+(aq) + 2Cl-(aq) 
C)  Ni2+(aq) + 2Cl-(aq) → Ni(s) + Cl2(g) 
D)  Ni2+(aq) + 2Cl-(aq) → NiCl2(s)

Question 6

Which of the following is the weakest oxidizing agent?

Accepted Answer

A)  Sn2+(aq) 
B)  Cr3+(aq) 
C)  Sn4+(aq) 
D)  Cr(s) 
E)  Sn(s)

Question 7

Which of the following statements is true for the cell diagram below? Zn(s)∣ Zn2+(aq)  Cu2+(aq)∣ Cu(s)

Accepted Answer

A)  Zn is oxidized, Cu is reduced; the single vertical lines represent phase boundaries while the two vertical lines represent a salt bridge.
B)  Zn2+is oxidized, Cu is reduced; the single vertical lines represent phase boundaries while the two vertical lines represent a salt bridge.
C)  Zn is oxidized, Cu2+ is reduced; the single vertical lines represent phase boundaries while the two vertical lines represent a salt bridge.
D)  Zn is oxidized, Cu2+ is reduced; the single vertical lines represent salt bridges while the two vertical lines represent a phase boundary.
E)  Zn is reduced, Cu2+ is oxidized; the single vertical lines represent phase boundaries while the two vertical lines represent a salt bridge.

Question 8

Nickel can be plated from aqueous solution according to the following half-reaction. How long would it take (in min)to plate 29.6 g of nickel at 4.7 A? Ni2+(aq)+ 2 e⁻ → Ni(s)

Accepted Answer

A)  1.7 × 102 min
B)  5.9 × 102 min
C)  3.5 × 102 min
D)  4.8 × 102 min
E)  6.2 × 102 min

Question 9

Balance the following redox reaction if it occurs in basic solution. What are the coefficients in front of Al and F2 in the balanced reaction? Al(s)+ F2(g)→ Al3+(aq)+ F-(aq)

Accepted Answer

A)  Al = 2, F2 = 3
B)  Al = 2, F2 = 6
C)  Al = 1, F2 = 1
D)  Al = 2, F2 = 1
E)  Al = 3, F2 = 2

Question 10

Which of the following is the weakest oxidizing agent?

Accepted Answer

A)  H2O2(aq) 
B)  Fe3+(aq) 
C)  ClO2(g) 
D)  I2(s) 
E)  Fe(s)

Question 11

Which of the following is the strongest reducing agent?

Accepted Answer

A)  Na(s) 
B)  Li+(aq) 
C)  Ca(s) 
D)  Ca2+(aq) 
E)  Li(s)

Question 12

Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 2 5°C. (The equation is balanced.) Pb(s)+ Br2(l)→ Pb2+(aq)+ 2 Br⁻(aq)
Pb2+(aq)+ 2 e⁻ → Pb(s) E° = -0.13 V
Br2(l)+ 2 e⁻ → 2 Br⁻(aq)E° = +1.07 V

Accepted Answer

A)  +1.20 V
B)  +0.94 V
C)  -0.94 V
D)  -1.20 V
E)  -0.60 V

Question 13

A galvanic cell consists of one half-cell that contains Ag(s)and Ag+(aq), and one half-cell that contains Cu(s)and Cu2+(aq). What species are produced at the electrodes under standard conditions? Ag+(aq)+ e- → Ag(s)E° = +0.80 V
Cu2+(aq)+ 2 e- → Cu(s)E° = +0.34 V

Accepted Answer

A)  Ag(aq) is formed at the cathode, and Cu(s) is formed at the anode.
B)  Ag(s) is formed at the cathode, and Cu2+(aq) is formed at the anode.
C)  Cu(s) is formed at the cathode, and Ag+(aq) is formed at the anode.
D)  Cu2+(aq) is formed at the cathode, and Cu(s) is formed at the anode.

Question 14

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of H⁺ and Fe3+ in the balanced reaction? Fe2+(aq)+ MnO4⁻(aq)→ Fe3+(aq)+ Mn2+(aq)

Accepted Answer

A)  H⁺ = 2, Fe3+ = 3
B)  H⁺ = 8, Fe3+ = 5
C)  H⁺ = 3, Fe3+ = 2
D)  H⁺ = 5, Fe3+ = 1
E)  H⁺ = 8, Fe3+ = 1

Question 15

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of H2C2O4 and H2O in the balanced reaction? MnO4⁻ (aq)+ H2C2O4(aq)→ Mn2+(aq)+ CO2(g)

Accepted Answer

A)  H2C2O4 = 5, H2O = 8
B)  H2C2O4 = 1, H2O = 1
C)  H2C2O4 = 5, H2O = 1
D)  H2C2O4 = 1, H2O = 4
E)  H2C2O4 = 3, H2O = 2

Question 16

Which of the following metals will dissolve in nitric acid but not hydrochloric acid?

Accepted Answer

A)  Cd; Eo(Cd2+/Cd) = -0.40V
B)  Cr; Eo(Cr3+/Cr) = -0.73V
C)  Mn; Eo(Mn2+/Mn) = -1.18V
D)  Ag; Eo(Ag+/Ag) = +0.80V
E)  Al; Eo(Al3+/Al) = -1.66V

Question 17

What is undergoing oxidation in the redox reaction represented by the following cell notation? Pb(s)∣ Pb2+(aq)  H+(aq)∣ H2(g)∣ Pt(s)

Accepted Answer

A)  H2(g) 
B)  H+(aq) 
C)  Pb2+(aq) 
D)  Pb(s) 
E)  Pt(s)

Question 18

What is the oxidizing agent in the redox reaction represented by the following cell notation? Ni(s)∣ Ni2+(aq)  Ag+(aq)∣ Ag(s)

Accepted Answer

A)  Ni(s) 
B)  Ni2+(aq) 
C)  Ag+(aq) 
D)  Ag(s) 
E)  Pt(s)

Question 19

Use the standard half-cell potentials listed below to calculate the standard cell potential for the following reaction occurring in an electrochemical cell at 25 °C. (The equation is balanced.) 3Cl2(g)+ 2Fe(s)→ 6Cl⁻(aq)+ 2Fe3+(aq)
Cl2(g)+ 2 e⁻ → 2Cl⁻(aq)E° = +1.36 V
Fe3+(aq)+ 3 e⁻ → Fe(s)E° = -0.04 V

Accepted Answer

A)  +4.16 V
B)  -1.40 V
C)  -1.32 V
D)  +1.32 V
E)  +1.40 V

Question 20

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of Cd and Ag+ in the balanced reaction? Cd(s)+ Ag+(aq)→ Ag(s)+ Cd2+(aq)

Accepted Answer

A)  Cd = 1, Ag⁺ = 2
B)  Cd = 1, Ag⁺ = 1
C)  Cd = 2, Ag⁺ = 1
D)  Cd = 2, Ag⁺ = 2
E)  Cd = 3, Ag⁺ = 1

Exam 18: Electrochemistry

What element is being reduced in the following (unbalanced) redox reaction? Cr(OH) ₄⁻(aq) + ClO⁻(aq) → CrO₄^2-(aq) + Cl⁻(aq)

The standard emf for the cell using the overall cell reaction below is +0.48 V: Zn(s) + Ni²⁺ (aq) → Zn²⁺ (aq) + Ni(s) The emf generated by the cell when [Ni²⁺] = 2.50 mol L^-1 and [Zn²⁺] = 0.100 mol L^-1 is

Why is sugar water not a good conductor of current?

What is the balanced equation for the galvanic cell reaction expressed using shorthand notation below? Ni(s) ∣ Ni²⁺(aq) ∣∣ Cl₂(g) ∣ Cl^-(aq) ∣ C(s)

Which of the following is the weakest oxidizing agent?

Which of the following statements is true for the cell diagram below? Zn(s) ∣ Zn²⁺(aq) Cu²⁺(aq) ∣ Cu(s)

Nickel can be plated from aqueous solution according to the following half-reaction. How long would it take (in min) to plate 29.6 g of nickel at 4.7 A? Ni²⁺(aq) + 2 e⁻ → Ni(s)

Balance the following redox reaction if it occurs in basic solution. What are the coefficients in front of Aland F₂ in the balanced reaction? Al(s) + F₂(g) → Al³⁺(aq) + F^-(aq)

Which of the following is the weakest oxidizing agent?

Which of the following is the strongest reducing agent?

A galvanic cell consists of one half-cell that contains Ag(s) and Ag⁺(aq) , and one half-cell that contains Cu(s) and Cu²⁺(aq) . What species are produced at the electrodes under standard conditions? Ag⁺(aq) + e^- → Ag(s) E° = +0.80 V Cu²⁺(aq) + 2 e^- → Cu(s) E° = +0.34 V

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of H⁺and Fe³⁺ in the balanced reaction? Fe²⁺(aq) + MnO₄⁻(aq) → Fe³⁺(aq) + Mn²⁺(aq)

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of H₂C₂O₄and H₂O in the balanced reaction? MnO₄⁻ (aq) + H₂C₂O₄(aq) → Mn²⁺(aq) + CO₂(g)

Which of the following metals will dissolve in nitric acid but not hydrochloric acid?

What is undergoing oxidation in the redox reaction represented by the following cell notation? Pb(s) ∣ Pb²⁺(aq) H⁺(aq) ∣ H₂(g) ∣ Pt(s)

What is the oxidizing agent in the redox reaction represented by the following cell notation? Ni(s) ∣ Ni²⁺(aq) Ag⁺(aq) ∣ Ag(s)

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of Cdand Ag⁺ in the balanced reaction? Cd(s) + Ag⁺(aq) → Ag(s) + Cd²⁺(aq)

Exam 18: Electrochemistry

What element is being reduced in the following (unbalanced) redox reaction? Cr(OH) 4⁻(aq) + ClO⁻(aq) → CrO42-(aq) + Cl⁻(aq)

The standard emf for the cell using the overall cell reaction below is +0.48 V: Zn(s) + Ni2+ (aq) → Zn2+ (aq) + Ni(s) The emf generated by the cell when [Ni2+] = 2.50 mol L-1 and [Zn2+] = 0.100 mol L-1 is

Why is sugar water not a good conductor of current?

What is the balanced equation for the galvanic cell reaction expressed using shorthand notation below? Ni(s) ∣ Ni2+(aq) ∣∣ Cl2(g) ∣ Cl-(aq) ∣ C(s)

Which of the following is the weakest oxidizing agent?

Which of the following statements is true for the cell diagram below? Zn(s) ∣ Zn2+(aq) Cu2+(aq) ∣ Cu(s)

Nickel can be plated from aqueous solution according to the following half-reaction. How long would it take (in min) to plate 29.6 g of nickel at 4.7 A? Ni2+(aq) + 2 e⁻ → Ni(s)

Balance the following redox reaction if it occurs in basic solution. What are the coefficients in front of Al and F2 in the balanced reaction? Al(s) + F2(g) → Al3+(aq) + F-(aq)

Which of the following is the weakest oxidizing agent?

Which of the following is the strongest reducing agent?

A galvanic cell consists of one half-cell that contains Ag(s) and Ag+(aq) , and one half-cell that contains Cu(s) and Cu2+(aq) . What species are produced at the electrodes under standard conditions? Ag+(aq) + e- → Ag(s) E° = +0.80 V Cu2+(aq) + 2 e- → Cu(s) E° = +0.34 V

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of H⁺ and Fe3+ in the balanced reaction? Fe2+(aq) + MnO4⁻(aq) → Fe3+(aq) + Mn2+(aq)

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of H2C2O4 and H2O in the balanced reaction? MnO4⁻ (aq) + H2C2O4(aq) → Mn2+(aq) + CO2(g)

Which of the following metals will dissolve in nitric acid but not hydrochloric acid?

What is undergoing oxidation in the redox reaction represented by the following cell notation? Pb(s) ∣ Pb2+(aq) H+(aq) ∣ H2(g) ∣ Pt(s)

What is the oxidizing agent in the redox reaction represented by the following cell notation? Ni(s) ∣ Ni2+(aq) Ag+(aq) ∣ Ag(s)

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of Cd and Ag+ in the balanced reaction? Cd(s) + Ag+(aq) → Ag(s) + Cd2+(aq)

What element is being reduced in the following (unbalanced) redox reaction? Cr(OH) ₄⁻(aq) + ClO⁻(aq) → CrO₄^2-(aq) + Cl⁻(aq)

The standard emf for the cell using the overall cell reaction below is +0.48 V: Zn(s) + Ni²⁺ (aq) → Zn²⁺ (aq) + Ni(s) The emf generated by the cell when [Ni²⁺] = 2.50 mol L^-1 and [Zn²⁺] = 0.100 mol L^-1 is

What is the balanced equation for the galvanic cell reaction expressed using shorthand notation below? Ni(s) ∣ Ni²⁺(aq) ∣∣ Cl₂(g) ∣ Cl^-(aq) ∣ C(s)

Which of the following statements is true for the cell diagram below? Zn(s) ∣ Zn²⁺(aq) Cu²⁺(aq) ∣ Cu(s)

Nickel can be plated from aqueous solution according to the following half-reaction. How long would it take (in min) to plate 29.6 g of nickel at 4.7 A? Ni²⁺(aq) + 2 e⁻ → Ni(s)

Balance the following redox reaction if it occurs in basic solution. What are the coefficients in front of Aland F₂ in the balanced reaction? Al(s) + F₂(g) → Al³⁺(aq) + F^-(aq)

A galvanic cell consists of one half-cell that contains Ag(s) and Ag⁺(aq) , and one half-cell that contains Cu(s) and Cu²⁺(aq) . What species are produced at the electrodes under standard conditions? Ag⁺(aq) + e^- → Ag(s) E° = +0.80 V Cu²⁺(aq) + 2 e^- → Cu(s) E° = +0.34 V

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of H⁺and Fe³⁺ in the balanced reaction? Fe²⁺(aq) + MnO₄⁻(aq) → Fe³⁺(aq) + Mn²⁺(aq)

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of H₂C₂O₄and H₂O in the balanced reaction? MnO₄⁻ (aq) + H₂C₂O₄(aq) → Mn²⁺(aq) + CO₂(g)

What is undergoing oxidation in the redox reaction represented by the following cell notation? Pb(s) ∣ Pb²⁺(aq) H⁺(aq) ∣ H₂(g) ∣ Pt(s)

What is the oxidizing agent in the redox reaction represented by the following cell notation? Ni(s) ∣ Ni²⁺(aq) Ag⁺(aq) ∣ Ag(s)

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of Cdand Ag⁺ in the balanced reaction? Cd(s) + Ag⁺(aq) → Ag(s) + Cd²⁺(aq)