Question 1

What is the reduction half-reaction for the following overall cell reaction? Pb2+(aq)+ 2 Ag(s)→ Pb(s)+ 2 Ag+(aq)

Accepted Answer

A) Ag(s)+ e- → Ag+(aq) 
B) Ag+(aq)+ e- → Ag(s) 
C) Pb2+(aq)+ 2 e- → Pb(s) 
D) Pb2+(aq)+ e- → Pb(s) 
A) Ag(s)+ e- → Ag+(aq) 
B) Ag+(aq)+ e- → Ag(s) 
C) Pb2+(aq)+ 2 e- → Pb(s) 
D) Pb2+(aq)+ e- → Pb(s)

Question 2

The standard potential for the following galvanic cell is +0.90 V: 3 Cu2+(aq)+ 2 Ga(s)⇌ 3 Cu(s)+ 2 Ga3+(aq)
Given that the standard reduction potential for the Cu2+/Cu half-cell is +0.34 V,what is the standard reduction potential for the Ga3+/Ga half-cell?

Accepted Answer

A) -1.34 V 
B) -0.56 V 
C) +0.56 V 
D) +1.36 V 
A) -1.34 V 
B) -0.56 V 
C) +0.56 V 
D) +1.36 V

Question 3

Consider the following table of standard reduction potentials:     Which substance is the strongest reducing agent?

Accepted Answer

A) A 
B) B 
C) C3 
D) C- 
A) A 
B) B 
C) C3 
D) C-

Question 4

Consider the galvanic cell shown below.  
-What is the shorthand notation for the cell?

Accepted Answer

A) Al(s)| Al3+(aq)|| Co(s)| Co2+(aq) 
B) Al(s)| Al3+(aq)|| Co2+(aq)| Co(s) 
C) Co(s)| Co2+(aq)|| Al(s)| Al3+(aq) 
D) Co(s)| Co2+(aq)|| Al3+(aq)| Al(s) 
A) Al(s)| Al3+(aq)|| Co(s)| Co2+(aq) 
B) Al(s)| Al3+(aq)|| Co2+(aq)| Co(s) 
C) Co(s)| Co2+(aq)|| Al(s)| Al3+(aq) 
D) Co(s)| Co2+(aq)|| Al3+(aq)| Al(s)

Question 5

What is the shorthand notation that represents the following galvanic cell reaction? Fe(s)+ Cu(NO3)2(aq)→ Fe(NO3)2(aq)+ Cu(s)

Accepted Answer

A) Fe(s)∣ Fe2+(aq)∣∣ Cu2+(aq)∣ Cu(s) 
B) Cu(s)∣ Cu2+(aq)∣∣ Fe2+(aq)∣ Fe(s) 
C) Fe(s)∣ NO3-(aq)∣∣ NO3-(aq)∣ Cu(s) 
D) Cu(s)∣ Cu(NO3)2(aq)∣∣ Fe(NO3)2(aq)∣ Fe(s) 
A) Fe(s)∣ Fe2+(aq)∣∣ Cu2+(aq)∣ Cu(s) 
B) Cu(s)∣ Cu2+(aq)∣∣ Fe2+(aq)∣ Fe(s) 
C) Fe(s)∣ NO3-(aq)∣∣ NO3-(aq)∣ Cu(s) 
D) Cu(s)∣ Cu(NO3)2(aq)∣∣ Fe(NO3)2(aq)∣ Fe(s)

Question 6

What is the oxidation half reaction in the following chemical reaction? Cr2O72-(aq)+ 6 Cl-(aq)+ 14 H+(aq)→ 2 Cr3+(aq)+ 3 Cl2(aq)+ 7 H2O(l)

Accepted Answer

A) Cr2O72-(aq)+ 14 H+(aq)+ 6e- → 2 Cr3+(aq)+ 7 H2O(l) 
B) Cr2O72-(aq)+ 14 H+(aq)→ 2 Cr3+(aq)+ 7 H2O(l)+ 6e- 
C) 2 Cl-(aq)→ Cl2(aq)+ 2e- 
D) Cl2(aq)+ 2e- → 2 Cl-(aq) 
A) Cr2O72-(aq)+ 14 H+(aq)+ 6e- → 2 Cr3+(aq)+ 7 H2O(l) 
B) Cr2O72-(aq)+ 14 H+(aq)→ 2 Cr3+(aq)+ 7 H2O(l)+ 6e- 
C) 2 Cl-(aq)→ Cl2(aq)+ 2e- 
D) Cl2(aq)+ 2e- → 2 Cl-(aq)

Question 7

What are the coefficients in front of NO3-(aq)and Mg(s)when the following redox equation is balanced in an acidic solution? ________ NO3-(aq)+ ________ Mg(s)→ ________ NO(g)+ ________ Mg2+(aq)

Accepted Answer

A) 2,3 
B) 2,6 
C) 3,4 
D) 3,6 
A) 2,3 
B) 2,6 
C) 3,4 
D) 3,6

Question 8

O2(g)+ 4 H+(aq)+ 4 e- → 2 H2O(l)E° = +1.23 V Pb2+(aq)+ 2 e- → Pb(s)E° = -0.13 V
2 H2O(l)+ 2 e- → H2(g)+ 2 OH-(aq)E° = -0.83 V
Based on the half-reactions above,electrolysis of an aqueous solution of Pb(NO3)2 is expected to produce.

Accepted Answer

A) Pb at the cathode and H2 at the anode. 
B) Pb at the cathode and O2 at the anode. 
C) H2 at the cathode and Pb at the anode. 
D) O2 at the cathode and Pb at the anode. 
A) Pb at the cathode and H2 at the anode. 
B) Pb at the cathode and O2 at the anode. 
C) H2 at the cathode and Pb at the anode. 
D) O2 at the cathode and Pb at the anode.

Question 9

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(s)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. 
A) Ag(s)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 10

In the shorthand notation for a galvanic cell,a single vertical line (|)represents a ________,and a double vertical line (|| )represents a ________.

Accepted Answer

phase boun

Question 11

Ag+(aq)+ e- → Ag(s)E° = +0.800 V AgBr(s)+ e- → Ag(s)+ Br-(aq)E° = +0.071 V
Br2(l)+ 2 e- → 2 Br-(aq)E° = +1.066 V
Use some of the data above to calculate Ksp at 25°C for AgBr.

Accepted Answer

A) 6.3 × 10-2 
B) 4.9 × 10-13 
C) 1.9 × 10-15 
D) 12.4× 10-34 
A) 6.3 × 10-2 
B) 4.9 × 10-13 
C) 1.9 × 10-15 
D) 12.4× 10-34

Question 12

How many moles of electrons,n,are transferred in the following reduction-oxidation reaction? 2 MnO4-(aq)+ 16 H+(aq)+ 10 Cl-(aq)→ 2 Mn2+(aq)+ 5 Cl2(g)+ 8 H2O(l)

Accepted Answer

A) 2 
B) 4 
C) 5 
D) 10 
A) 2 
B) 4 
C) 5 
D) 10

Question 13

Consider the following galvanic cell.  
-What is the shorthand notation for the cell?

Accepted Answer

A) Fe(s)| Fe2+(aq)|| Sn(s)| Sn2+(aq) 
B) Fe(s)| Fe2+(aq)|| Sn2+(aq)| Sn(s) 
C) Sn(s)| Sn2+(aq)|| Fe(s)| Fe2+(aq) 
D) Sn(s)| Sn2+(aq)|| Fe2+(aq)| Fe(s) 
A) Fe(s)| Fe2+(aq)|| Sn(s)| Sn2+(aq) 
B) Fe(s)| Fe2+(aq)|| Sn2+(aq)| Sn(s) 
C) Sn(s)| Sn2+(aq)|| Fe(s)| Fe2+(aq) 
D) Sn(s)| Sn2+(aq)|| Fe2+(aq)| Fe(s)

Question 14

For the hypothetical reaction 3 A + 2 Bx → 3 Ay + 2 B,E° = 0.85 V and G° = -495 kJ.For this reaction the values of x and y are ________ and ________.

Accepted Answer

Question 15

For the galvanic cell Pt(s)∣ Sn2+(aq),Sn4+(aq)∣∣ Cd2+(aq)∣ Cd(s),what is the function of the Pt(s)?

Accepted Answer

A) Pt is the anode and is a reactant in the overall cell reaction. 
B) Pt is the anode and does not appear in the overall cell reaction. 
C) Pt is the cathode and is a product in the overall cell reaction. 
D) Pt is the cathode and does not appear in the overall cell reaction. 
A) Pt is the anode and is a reactant in the overall cell reaction. 
B) Pt is the anode and does not appear in the overall cell reaction. 
C) Pt is the cathode and is a product in the overall cell reaction. 
D) Pt is the cathode and does not appear in the overall cell reaction.

Question 16

Based on the half-reactions and their respective standard reduction potentials below,which addition to an aqueous solution containing Fe(NO3)2 will result in a reaction under standard-state conditions? O2(g)+ 4 H+ +4 e- → 2 H2O(l)1.23 V
Fe3+(aq)+ e- → Fe2+(aq)0.77 V
Cu2+(aq)+ 2 e- → Cu(s)0.34 V
2 H+(aq)+ 2 e- → H2(g)0.00 V
Ni2+(aq)+ + 2 e- → Ni(s)-0.26 V
Fe2+(aq)+ 2 e- → Fe(s)-0.45 V

Accepted Answer

A) aqueous copper(II)acetate 
B) nickel wire 
C) hydrogen gas 
D) oxygen gas 
A) aqueous copper(II)acetate 
B) nickel wire 
C) hydrogen gas 
D) oxygen gas

Question 17

Consider the galvanic cell shown below.  
-What is the quantitative change in the cell voltage on increasing the ion concentration in the anode compartment by a factor of 10?

Accepted Answer

A) +0.03 V 
B) +0.02 V 
C) -0.02 V 
D) -0.03 V 
A) +0.03 V 
B) +0.02 V 
C) -0.02 V 
D) -0.03 V

Question 18

When suspected drunk drivers are tested with a Breathalyzer,the alcohol (ethanol)in the exhaled breath is oxidized to acetic acid with an acidic solution of potassium dichromate: 3CH3CH2OH(aq)+ 2Cr2O7-2 (aq)+ 16H+(aq)3CH3CO2H(aq)+ 4Cr+3(aq)+ 11H2O (l)
If Eº for this cell is 1.30V and the standard half-cell potential of Cr2O7-2(aq)to Cr+3 is 1.358 V,what is the standard half-cell reduction potential for the conversion of acetic acid to ethanol?

Accepted Answer

A) 2.658 V 
B) -2.658 V 
C) + 0.058 V 
D) -0.058 V 
A) 2.658 V 
B) -2.658 V 
C) + 0.058 V 
D) -0.058 V

Question 19

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 40.0 minutes?

Accepted Answer

A) 3.45 g 
B) 6.15 g 
C) 10.3 g 
D) 31.0 g 
A) 3.45 g 
B) 6.15 g 
C) 10.3 g 
D) 31.0 g

Question 20

NaNO3(aq)is employed in the salt bridge.Give the direction of electron flow and the direction of ion flow from the salt bridge.

Accepted Answer

A) Electrons flow from a to c;Na+ flows into b and NO3- flows into d. 
B) Electrons flow from a to c;NO3- flows into b and Na+ flows into d. 
C) Electrons flow from c to a;Na+ flows into b and NO3- flows into d. 
D) Electrons flow from c to a;NO3- flows into b and Na+ flows into d. 
A) Electrons flow from a to c;Na+ flows into b and NO3- flows into d. 
B) Electrons flow from a to c;NO3- flows into b and Na+ flows into d. 
C) Electrons flow from c to a;Na+ flows into b and NO3- flows into d. 
D) Electrons flow from c to a;NO3- flows into b and Na+ flows into d.

Exam 18: Electrochemistry

What is the reduction half-reaction for the following overall cell reaction? Pb2+(aq)+ 2 Ag(s)→ Pb(s)+ 2 Ag+(aq)

The standard potential for the following galvanic cell is +0.90 V: 3 Cu2+(aq)+ 2 Ga(s)⇌ 3 Cu(s)+ 2 Ga3+(aq) Given that the standard reduction potential for the Cu2+/Cu half-cell is +0.34 V,what is the standard reduction potential for the Ga3+/Ga half-cell?

Consider the following table of standard reduction potentials: Which substance is the strongest reducing agent?

Consider the galvanic cell shown below. -What is the shorthand notation for the cell?

What is the shorthand notation that represents the following galvanic cell reaction? Fe(s)+ Cu(NO3)2(aq)→ Fe(NO3)2(aq)+ Cu(s)

What is the oxidation half reaction in the following chemical reaction? Cr2O72-(aq)+ 6 Cl-(aq)+ 14 H+(aq)→ 2 Cr3+(aq)+ 3 Cl2(aq)+ 7 H2O(l)

What are the coefficients in front of NO3-(aq)and Mg(s)when the following redox equation is balanced in an acidic solution? ________ NO3-(aq)+ ________ Mg(s)→ ________ NO(g)+ ________ Mg2+(aq)

O2(g)+ 4 H+(aq)+ 4 e- → 2 H2O(l)E° = +1.23 V Pb2+(aq)+ 2 e- → Pb(s)E° = -0.13 V 2 H2O(l)+ 2 e- → H2(g)+ 2 OH-(aq)E° = -0.83 V Based on the half-reactions above,electrolysis of an aqueous solution of Pb(NO3)2 is expected to produce.

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

In the shorthand notation for a galvanic cell,a single vertical line (|)represents a ________,and a double vertical line (|| )represents a ________.

Ag+(aq)+ e- → Ag(s)E° = +0.800 V AgBr(s)+ e- → Ag(s)+ Br-(aq)E° = +0.071 V Br2(l)+ 2 e- → 2 Br-(aq)E° = +1.066 V Use some of the data above to calculate Ksp at 25°C for AgBr.

How many moles of electrons,n,are transferred in the following reduction-oxidation reaction? 2 MnO4-(aq)+ 16 H+(aq)+ 10 Cl-(aq)→ 2 Mn2+(aq)+ 5 Cl2(g)+ 8 H2O(l)

Consider the following galvanic cell. -What is the shorthand notation for the cell?

For the hypothetical reaction 3 A + 2 Bx → 3 Ay + 2 B,E° = 0.85 V and G° = -495 kJ.For this reaction the values of x and y are ________ and ________.

For the galvanic cell Pt(s)∣ Sn2+(aq),Sn4+(aq)∣∣ Cd2+(aq)∣ Cd(s),what is the function of the Pt(s)?

Consider the galvanic cell shown below. -What is the quantitative change in the cell voltage on increasing the ion concentration in the anode compartment by a factor of 10?

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 40.0 minutes?

NaNO3(aq)is employed in the salt bridge.Give the direction of electron flow and the direction of ion flow from the salt bridge.

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What is the reduction half-reaction for the following overall cell reaction? Pb²⁺(aq)+ 2 Ag(s)→ Pb(s)+ 2 Ag⁺(aq)

The standard potential for the following galvanic cell is +0.90 V: 3 Cu²⁺(aq)+ 2 Ga(s)⇌ 3 Cu(s)+ 2 Ga³⁺(aq) Given that the standard reduction potential for the Cu²⁺/Cu half-cell is +0.34 V,what is the standard reduction potential for the Ga³⁺/Ga half-cell?

What is the shorthand notation that represents the following galvanic cell reaction? Fe(s)+ Cu(NO₃)₂(aq)→ Fe(NO₃)₂(aq)+ Cu(s)

What is the oxidation half reaction in the following chemical reaction? Cr₂O₇^2-(aq)+ 6 Cl^-(aq)+ 14 H⁺(aq)→ 2 Cr³⁺(aq)+ 3 Cl₂(aq)+ 7 H₂O(l)

What are the coefficients in front of NO₃^-(aq)and Mg(s)when the following redox equation is balanced in an acidic solution? NO₃^-(aq)+ Mg(s)→ NO(g)+ Mg²⁺(aq)

O₂(g)+ 4 H⁺(aq)+ 4 e^- → 2 H₂O(l)E° = +1.23 V Pb²⁺(aq)+ 2 e^- → Pb(s)E° = -0.13 V 2 H₂O(l)+ 2 e^-→ H₂(g)+ 2 OH^-(aq)E° = -0.83 V Based on the half-reactions above,electrolysis of an aqueous solution of Pb(NO₃)₂ is expected to produce.

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

In the shorthand notation for a galvanic cell,a single vertical line (|)represents a ,and a double vertical line (|| )represents a .

Ag⁺(aq)+ e^- → Ag(s)E° = +0.800 V AgBr(s)+ e^- → Ag(s)+ Br^-(aq)E° = +0.071 V Br₂(l)+ 2 e^- → 2 Br^-(aq)E° = +1.066 V Use some of the data above to calculate K_sp at 25°C for AgBr.

How many moles of electrons,n,are transferred in the following reduction-oxidation reaction? 2 MnO₄^-(aq)+ 16 H⁺(aq)+ 10 Cl^-(aq)→ 2 Mn²⁺(aq)+ 5 Cl₂(g)+ 8 H₂O(l)

For the hypothetical reaction 3 A + 2 B^x → 3 A^y + 2 B,E° = 0.85 V and G° = -495 kJ.For this reaction the values of x and y are and .

For the galvanic cell Pt(s)∣ Sn²⁺(aq),Sn⁴⁺(aq)∣∣ Cd²⁺(aq)∣ Cd(s),what is the function of the Pt(s)?

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 40.0 minutes?

NaNO₃(aq)is employed in the salt bridge.Give the direction of electron flow and the direction of ion flow from the salt bridge.