Question 1

Explain the use of a salt bridge.

Accepted Answer

The salt bridge allo...

Question 2

Which of the following is the strongest reducing agent? 2+(aq)  B) Cr3+(aq)  C) Sn4+(aq)  D) Cr(s)  E) Sn(s) " class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Sn2+(aq) 
B)  Cr3+(aq) 
C)  Sn4+(aq) 
D)  Cr(s) 
E)  Sn(s) F) A) and B)
G) None of the above

Question 3

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. ) 
3 Cl2(g) + 2 Fe(s) → 6 Cl⁻(aq) + 2 Fe3+(aq) 
2(g) + 2 Fe(s) → 6 Cl⁻(aq) + 2 Fe3+(aq)    A) 4.16 V B) -1.40 V C) -1.32 V D) 1.32 V E) 1.40 V" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  4.16 V
B)  -1.40 V
C)  -1.32 V
D)  1.32 V
E)  1.40 VF) C) and E)
G) D) and E)

Question 4

Determine the cell notation for the redox reaction given below.
3 Cl2(g) + 2 Fe(s) → 6 Cl⁻(aq) + 2 Fe3+(aq)

Accepted Answer

A)  Cl2(g) ∣ Cl⁻(aq) ∣ Pt ∣∣ Fe(s) ∣ Fe3+(aq) 
B)  Cl⁻(aq) ∣ Cl2(g) ∣ Pt ∣∣ Fe3+(aq)  ∣ Fe(s) 
C)  Fe3+(aq) ∣ Fe(s) ∣∣ Cl⁻(aq) ∣ Cl2(g) ∣ Pt
D)  Fe(s) ∣ Cl2(g) ∣∣ Fe3+(aq) ∣ Cl⁻(aq) ∣ Pt
E)  Fe(s) ∣ Fe3+(aq) ∣∣ Cl2(g) ∣ Cl⁻(aq) ∣ PtF) C) and E)
G) C) and D)

Question 5

What mass of silver can be plated onto an object in 33.5 minutes at 8.70 A of current?
Ag⁺(aq) + e⁻ → Ag(s)

Accepted Answer

A)  19.6 g
B)  0.326 g
C)  9.78 g
D)  3.07 g
E)  0.102 gF) A) and D)
G) A) and B)

Question 6

A galvanic cell consists of a Mg2+/Mg half-cell and a standard hydrogen electrode.If the Mg2+/Mg half-cell standard cell functions as the anode,and the standard cell potential is 2.37 V,what is the standard reduction potential for the Mg2+/Mg half-cell?

Accepted Answer

A)  -2.37 V
B)  -1.18 V
C)  +1.18 V
D)  +2.37 VE) B) and D)
F) None of the above

Question 7

Match the following.
-Q = K

Accepted Answer

A)  Ecell = E°cell
B)  Ecell = 0
C)  E°cell 
D)  Ecell 
E)  E°cell > 0F) Ecell > 0G) C) and F)
H) B) and F)

Question 8

What element is being reduced in the following redox reaction?
MnO4⁻(aq) + H2C2O4(aq) → Mn2+(aq) + CO2(g)

Accepted Answer

A)  C
B)  O
C)  Mn
D)  HE) A) and D)
F) B) and C)

Question 9

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 320.minutes?

Accepted Answer

A)  27.6 g
B)  49.2 g
C)  82.4 g
D)  248 gE) All of the above
F) A) and D)

Question 10

How long must a constant current of 50.0 A be passed through an electrolytic cell containing aqueous Cu2+ ions to produce 5.00 moles of copper metal?

Accepted Answer

A)  0.187 hours
B)  0.373 hours
C)  2.68 hours
D)  5.36 hoursE) B) and D)
F) None of the above

Question 11

How many electrons are transferred in the following reaction? (The reaction is unbalanced. ) 
Ca(s) + Cr3+(aq) → Cr(s) + Ca2+(aq)

Accepted Answer

A)  6
B)  2
C)  3
D)  1
E)  4F) All of the above
G) A) and B)

Question 12

What is the reduction half-reaction for the following overall galvanic cell reaction?
Zn2+(aq) + 2 Ag(s) → Zn(s) + 2 Ag+(aq)

Accepted Answer

A)  Ag(s) + e- → Ag+(aq) 
B)  Ag+(aq) + e- → Ag(s) 
C)  Zn2+(aq) + 2 e- → Zn(s) 
D)  Zn2+(aq) + e- → Zn(s) E) None of the above
F) A) and B)

Question 13

What element is being reduced in the following redox reaction?
H2O2(l) + ClO2(aq) → ClO2⁻(aq) + O2(g)

Accepted Answer

A)  H
B)  O
C)  Cl
D)  N
E)  CF) C) and D)
G) B) and C)

Question 14

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 M and [Zn2+] = 0.100 M is ________ V.

Accepted Answer

A)  0.40
B)  0.50
C)  0.52
D)  0.56
E)  0.44F) B) and D)
G) A) and D)

Question 15

The standard cell potential (E°) of a voltaic cell constructed using the cell reaction below is 0.76 V:
Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g) 
With PH2 = 1.0 atm and [Zn2+] = 1.0 M,the cell potential is 0.66 V.The concentration of H+ in the cathode compartment is ________ M.

Accepted Answer

A)  2.0 × 10-2
B)  4.2 × 10-4
C)  1.4 × 10-1
D)  4.9 × 101 
E)  1.0 × 10-12F) A) and C)
G) A) and B)

Question 16

Give the criteria for a spontaneous reaction.

Accepted Answer

A) ΔG° cell > 0,K > 1 B) ΔG° > 0,E°cell > 0,K > 1 C) ΔG° > 0,E°cell 1 D) ΔG° cell > 0,K E) ΔG° > 0,E°cell < 0,K < 1F) A) and B) G) All of the above

Question 17

Determine which of the following pairs of reactants will result in a spontaneous reaction at 25°C. 4+(aq) + Mg(s)  B) Cr3+(aq) + Ni(s)  C) Zn(s) + Na+(aq)  D) Fe(s) + Ba2+(aq)  E) None of the above pairs will react." class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Sn4+(aq) + Mg(s) 
B)  Cr3+(aq) + Ni(s) 
C)  Zn(s) + Na+(aq) 
D)  Fe(s) + Ba2+(aq) 
E)  None of the above pairs will react.F) B) and D)
G) D) and E)

Question 18

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. ) 
Sn(s) + 2 Ag⁺(aq) → Sn2+(aq) + 2 Ag(s) 
2+(aq) + 2 Ag(s)    A) 1.74 V B) 0.94 V C) 1.08 V D) -1.08 V E) -1.74 V" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  1.74 V
B)  0.94 V
C)  1.08 V
D)  -1.08 V
E)  -1.74 VF) B) and E)
G) A) and E)

Question 19

Explain the significance of the standard hydrogen electrode (SHE)in the tabulation of standard reduction potentials of other species.

Accepted Answer

The SHE is used to construct an electroc...

Question 20

For the reaction below,determine the standard free energy change,ΔG°.
Cu(s) + Sn2+(aq) → Cu2+(aq) + Sn(s) E°cell = -0.48 V

Accepted Answer

A)  -46.3 kJ
B)  +46.3 kJ
C)  -92.6 kJ
D)  +92.6 kJE) B) and C)
F) None of the above

Exam 18: Electrochemistry

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. ) 3 Cl2(g) + 2 Fe(s) → 6 Cl⁻(aq) + 2 Fe3+(aq)

Correct AnswerverifiedShow Answer

How long must a constant current of 50.0 A be passed through an electrolytic cell containing aqueous Cu2+ ions to produce 5.00 moles of copper metal?

Correct AnswerverifiedShow Answer

For the reaction below,determine the standard free energy change,ΔG°. Cu(s) + Sn2+(aq) → Cu2+(aq) + Sn(s) E°cell = -0.48 V

Correct AnswerverifiedShow Answer

Explain the significance of the standard hydrogen electrode (SHE)in the tabulation of standard reduction potentials of other species.

Correct AnswerverifiedThe SHE is used to construct an electroc...View AnswerShow Answer

What element is being reduced in the following redox reaction? MnO4⁻(aq) + H2C2O4(aq) → Mn2+(aq) + CO2(g)

Correct AnswerverifiedShow Answer

Give the criteria for a spontaneous reaction.

Correct AnswerverifiedShow Answer

What mass of silver can be plated onto an object in 33.5 minutes at 8.70 A of current? Ag⁺(aq) + e⁻ → Ag(s)

Correct AnswerverifiedShow Answer

Match the following. -Q = K

Correct AnswerverifiedShow Answer

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 M and [Zn2+] = 0.100 M is ________ V.

Correct AnswerverifiedShow Answer

The standard cell potential (E°) of a voltaic cell constructed using the cell reaction below is 0.76 V: Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g) With PH2 = 1.0 atm and [Zn2+] = 1.0 M,the cell potential is 0.66 V.The concentration of H+ in the cathode compartment is ________ M.

Correct AnswerverifiedShow Answer

Determine which of the following pairs of reactants will result in a spontaneous reaction at 25°C.

Correct AnswerverifiedShow Answer

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 320.minutes?

Correct AnswerverifiedShow Answer

A galvanic cell consists of a Mg2+/Mg half-cell and a standard hydrogen electrode.If the Mg2+/Mg half-cell standard cell functions as the anode,and the standard cell potential is 2.37 V,what is the standard reduction potential for the Mg2+/Mg half-cell?

Correct AnswerverifiedShow Answer

Which of the following is the strongest reducing agent?

Correct AnswerverifiedShow Answer

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. ) Sn(s) + 2 Ag⁺(aq) → Sn2+(aq) + 2 Ag(s)

Correct AnswerverifiedShow Answer

How many electrons are transferred in the following reaction? (The reaction is unbalanced. ) Ca(s) + Cr3+(aq) → Cr(s) + Ca2+(aq)

Correct AnswerverifiedShow Answer

What element is being reduced in the following redox reaction? H2O2(l) + ClO2(aq) → ClO2⁻(aq) + O2(g)

Correct AnswerverifiedShow Answer

Determine the cell notation for the redox reaction given below. 3 Cl2(g) + 2 Fe(s) → 6 Cl⁻(aq) + 2 Fe3+(aq)

Correct AnswerverifiedShow Answer

Explain the use of a salt bridge.

Correct AnswerverifiedThe salt bridge allo...View AnswerShow Answer

What is the reduction half-reaction for the following overall galvanic cell reaction? Zn2+(aq) + 2 Ag(s) → Zn(s) + 2 Ag+(aq)

Correct AnswerverifiedShow Answer

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. ) 3 Cl₂(g) + 2 Fe(s) → 6 Cl⁻(aq) + 2 Fe³⁺(aq)

Correct Answer
verified

How long must a constant current of 50.0 A be passed through an electrolytic cell containing aqueous Cu²⁺ ions to produce 5.00 moles of copper metal?

Correct Answer
verified

For the reaction below,determine the standard free energy change,ΔG°. Cu(s) + Sn²⁺(aq) → Cu²⁺(aq) + Sn(s) E°_cell= -0.48 V

Correct Answer
verified

Correct Answer
verified
The SHE is used to construct an electroc...
View Answer

What element is being reduced in the following redox reaction? MnO₄⁻(aq) + H₂C₂O₄(aq) → Mn²⁺(aq) + CO₂(g)

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

Correct Answer
verified

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 M and [Zn²⁺] = 0.100 M is ________ V.

Correct Answer
verified

The standard cell potential (E°) of a voltaic cell constructed using the cell reaction below is 0.76 V: Zn(s) + 2H⁺(aq) → Zn²⁺(aq) + H₂(g) With P_H₂ = 1.0 atm and [Zn²⁺] = 1.0 M,the cell potential is 0.66 V.The concentration of H⁺ in the cathode compartment is ________ M.

Correct Answer
verified

Correct Answer
verified

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 320.minutes?

Correct Answer
verified

A galvanic cell consists of a Mg²⁺/Mg half-cell and a standard hydrogen electrode.If the Mg²⁺/Mg half-cell standard cell functions as the anode,and the standard cell potential is 2.37 V,what is the standard reduction potential for the Mg²⁺/Mg half-cell?

Correct Answer
verified

Correct Answer
verified

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. ) Sn(s) + 2 Ag⁺(aq) → Sn²⁺(aq) + 2 Ag(s)

Correct Answer
verified

How many electrons are transferred in the following reaction? (The reaction is unbalanced. ) Ca(s) + Cr³⁺(aq) → Cr(s) + Ca²⁺(aq)

Correct Answer
verified

What element is being reduced in the following redox reaction? H₂O₂(l) + ClO₂(aq) → ClO₂⁻(aq) + O₂(g)

Correct Answer
verified

Determine the cell notation for the redox reaction given below. 3 Cl₂(g) + 2 Fe(s) → 6 Cl⁻(aq) + 2 Fe³⁺(aq)

Correct Answer
verified

Correct Answer
verified
The salt bridge allo...
View Answer

What is the reduction half-reaction for the following overall galvanic cell reaction? Zn²⁺(aq) + 2 Ag(s) → Zn(s) + 2 Ag⁺(aq)

Correct Answer
verified