Question 1

If the cell reaction involves ions in solution,as the cell reaction in a galvanic cell continues,

Accepted Answer

A) E for the cell increases. 
B) E for the cell decreases. 
C) E° for the cell increases. 
D) E° for the cell decreases. 
A) E for the cell increases. 
B) E for the cell decreases. 
C) E° for the cell increases. 
D) E° for the cell decreases.

Question 2

For an electrolytic cell

Accepted Answer

A) E is negative and ΔG is negative for the cell reaction. 
B) E is negative and ΔG is positive for the cell reaction. 
C) E is positive and ΔG is negative for the cell reaction. 
D) E is positive and ΔG is positive for the cell reaction. 
A) E is negative and ΔG is negative for the cell reaction. 
B) E is negative and ΔG is positive for the cell reaction. 
C) E is positive and ΔG is negative for the cell reaction. 
D) E is positive and ΔG is positive for the cell reaction.

Question 3

The galvanic cell represented by the shorthand notation below contains KNO3(aq)in the salt bridge.During the reaction ________ ions flow into the anode compartment,and ________ ions flow into the cathode compartment.
Pt(s)|H2(g)|H+(aq)|| Sn4+(aq)|Sn2+(aq)|Pt(s)

Accepted Answer

Question 4

Calculate the value of the reaction quotient,Q,for the galvanic cell expressed using shorthand notation below.Use the balanced chemical equation that has the smallest whole number stoichiometric coefficients.
Zn(s)∣ Zn2+(aq,0.0100 M)∣∣ Ag+(aq,1.15 M)∣ Ag(s)

Accepted Answer

A) 132 
B) 115 
C) 8)70 × 10-3 
D) 7)56 × 10-3 
A) 132 
B) 115 
C) 8)70 × 10-3 
D) 7)56 × 10-3

Question 5

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 6

Which of the following statements concerning the electrorefining of copper in not true?

Accepted Answer

A) The anode is constructed of chalcocite,Cu2S. 
B) The anode mud is a valuable source of silver,gold,and platinum. 
C) Copper is oxidized at the anode and copper(II)ions are reduced at the cathode. 
D) The process is used to purify copper. 
A) The anode is constructed of chalcocite,Cu2S. 
B) The anode mud is a valuable source of silver,gold,and platinum. 
C) Copper is oxidized at the anode and copper(II)ions are reduced at the cathode. 
D) The process is used to purify copper.

Question 7

Shown below is a galvanic cell with anode compartment b containing anode a and cathode compartment d containing cathode c.Electrons flow through wire f,ions flow through salt bridge e,and the cell potential is read using voltmeter g.
This galvanic cell uses the reaction: Cu(s)+ 2 AgS1U1P1+S1S1P0(aq) $\rarr$ 2 Ag(s)+ CuS1U1P12+S1S1P0(aq).  
-The initial concentrations of Ag+(aq)and Cu2+(aq)are both 1.0 M.What will happen to the cell voltage if 1.0 M Cu(NO3)2 is added to the compartment containing the 1.0 M Cu2+(aq)? The cell voltage will

Accepted Answer

A) decrease. 
B) increase. 
C) remain the same. 
D) can't tell from the information given 
A) decrease. 
B) increase. 
C) remain the same. 
D) can't tell from the information given

Question 8

Aluminum requires relatively little protection from corrosion because

Accepted Answer

A) aluminum has little tendency to react with oxygen. 
B) the reduction potential for Al3+/Al is very low. 
C) the oxidation of aluminum produces a hard,relatively impenetrable film of Al2O3. 
D) aluminum is protected by cathodic protection. 
A) aluminum has little tendency to react with oxygen. 
B) the reduction potential for Al3+/Al is very low. 
C) the oxidation of aluminum produces a hard,relatively impenetrable film of Al2O3. 
D) aluminum is protected by cathodic protection.

Question 9

For a particular battery based on one of the following reactions,E is expected to remain constant with time until the cell reactants are almost completely consumed.Which is the appropriate reaction?

Accepted Answer

A) Zn(s)+ 2 MnO2(s)+ 2 NH4+(aq)→ 2 NH3(aq)+ Mn2O3(s)+ Zn2+(aq)+ H2O(l) 
B) 2 NiO(OH)(s)+ Cd(s)+ 2 H2O(l)→ 2 Ni(OH)2(s)+ Cd(OH)2(s) 
C) Pb(s)+ PbO2(s)+ 2 H+(aq)+ 2 HSO4-(aq)→ 2 PbSO4(s)+ 2 H2O(l) 
D) Zn(s)+ Cu2+(aq)→ Zn2+(aq)+ Cu(s) 
A) Zn(s)+ 2 MnO2(s)+ 2 NH4+(aq)→ 2 NH3(aq)+ Mn2O3(s)+ Zn2+(aq)+ H2O(l) 
B) 2 NiO(OH)(s)+ Cd(s)+ 2 H2O(l)→ 2 Ni(OH)2(s)+ Cd(OH)2(s) 
C) Pb(s)+ PbO2(s)+ 2 H+(aq)+ 2 HSO4-(aq)→ 2 PbSO4(s)+ 2 H2O(l) 
D) Zn(s)+ Cu2+(aq)→ Zn2+(aq)+ Cu(s)

Question 10

For a galvanic cell that uses the following two half-reactions,
Cr2O72-(aq)+ 14 H+(aq)+ 6 e- → 2 Cr3+(aq)+ 7 H2O(l)
Pb(s)→ Pb2+(aq)+ 2 e-
How many moles of Pb(s)are oxidized by three mol es of Cr2O72-?

Accepted Answer

A) 3 
B) 6 
C) 9 
D) 18 
A) 3 
B) 6 
C) 9 
D) 18

Question 11

Shown below is a galvanic cell with anode compartment b containing anode a and cathode compartment d containing cathode c.Electrons flow through wire f,ions flow through salt bridge e,and the cell potential is read using voltmeter g.
This galvanic cell uses the reaction: Cu(s)+ 2 AgS1U1P1+S1S1P0(aq) $\rarr$ 2 Ag(s)+ CuS1U1P12+S1S1P0(aq).  
-The initial concentrations of Ag+(aq)and Cu2+(aq)are both 1.0 M.What will happen to the cell voltage if 5.0 M AgNO3 is added to the compartment containing the 1.0 M Ag+(aq)? The cell voltage will

Accepted Answer

A) decrease. 
B) increase. 
C) remain the same. 
D) can't tell from the information given 
A) decrease. 
B) increase. 
C) remain the same. 
D) can't tell from the information given

Question 12

Shown below are the reactions occurring in the direct methanol fuel cell (DMFC).
I 2 CH3OH(aq)+ 2 H2O(l)→ 2 CO2(g)+12 H+(aq)+12 e-
II 3 O2(g)+ 12 H+(aq)+ 12 e- → 6 H2O(l)
Overall 2 CH3OH(aq)+ 3 O2(g)→ 2 CO2(g)+ 4 H2O(l)
Which is the anode reaction,and what is being oxidized in the overall reaction?

Accepted Answer

A) I,CH3OH 
B) I,H2O 
C) II,O2 
D) II,H+ 
A) I,CH3OH 
B) I,H2O 
C) II,O2 
D) II,H+

Question 13

The standard cell potential for the following galvanic cell is 1.21 V.
Al(s)|Al3+(aq)||Fe2+(aq)|Fe(s)
When [Al3+] = 0.10 M and [Fe2+] = 0.10 M,will the cell potential at 25°C be less than,the same as,or greater than 1.21 V?

Accepted Answer

Question 14

For the hypothetical reaction A + 2 Bx → Ay + 2 B,E° = 1.50 V = and ΔG° = -305 kJ.For this reaction,if the value of x is 4,then the value of y = .

Accepted Answer

A) 1 
B) 2 
C) 3 
D) 4 
A) 1 
B) 2 
C) 3 
D) 4

Question 15

In order for a cell potential to be a standard cell potential,the concentration of all ions in solution must be ________ M,the partial pressures of all gaseous species must be ________ atm,and the temperature must be ________ K.

Accepted Answer

The answer of In order for a cell potential to...

Question 16

For the galvanic cell Pt(s)∣ Sn2+(aq),Sn4+(aq)∣∣ Pb2+(aq)∣ Pb(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 17

Consider the galvanic cell shown below.  
-Identify the anode and cathode,and indicate the direction of ion flow to and from each electrode.

Accepted Answer

A) Al is the anode and Co is the cathode;Al3+ ions flow to the anode and Co2+ ions flow from the cathode. 
B) Al is the anode and Co is the cathode;Co2+ ions flow to the cathode and Al3+ ions flow from the anode. 
C) Co is the anode and Al is the cathode;Al3+ ions flow to the cathode and Co2+ ions flow from the anode. 
D) Co is the anode and Al is the cathode;Co2+ ions flow to the anode and Al3+ ions flow from the cathode. 
A) Al is the anode and Co is the cathode;Al3+ ions flow to the anode and Co2+ ions flow from the cathode. 
B) Al is the anode and Co is the cathode;Co2+ ions flow to the cathode and Al3+ ions flow from the anode. 
C) Co is the anode and Al is the cathode;Al3+ ions flow to the cathode and Co2+ ions flow from the anode. 
D) Co is the anode and Al is the cathode;Co2+ ions flow to the anode and Al3+ ions flow from the cathode.

Question 18

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

Question 19

Shown below are the reactions occurring in the proton-exchange membrane (PEM)fuel cell.
I 2 H2(g)→ 4 H+(aq)+ 4 e-
II O2(g)+ 4 H+(aq)+ 4 e- → 2 H2O(l)
Overall 2 H2(g)+ O2(g)→ 2 H2O(l)
Which is the cathode reaction,and what is being oxidized in the overall reaction?

Accepted Answer

A) I,H2 
B) I,O2 
C) II,H2 
D) II,O2 
A) I,H2 
B) I,O2 
C) II,H2 
D) II,O2

Question 20

Which of the following terms can be used to describe an electrochemical cell in which a spontaneous chemical reaction generates an electric current?
I.an electrolytic cell
II.a galvanic cell
III.a voltaic cell

Accepted Answer

A) only I 
B) only II 
C) only III 
D) II and III 
A) only I 
B) only II 
C) only III 
D) II and III

If the cell reaction involves ions in solution,as the cell reaction in a galvanic cell continues,

For an electrolytic cell

The galvanic cell represented by the shorthand notation below contains KNO₃(aq)in the salt bridge.During the reaction ions flow into the anode compartment,and ions flow into the cathode compartment. Pt(s)|H₂(g)|H⁺(aq)|| Sn⁴⁺(aq)|Sn²⁺(aq)|Pt(s)

Calculate the value of the reaction quotient,Q,for the galvanic cell expressed using shorthand notation below.Use the balanced chemical equation that has the smallest whole number stoichiometric coefficients. Zn(s)∣ Zn²⁺(aq,0.0100 M)∣∣ Ag⁺(aq,1.15 M)∣ Ag(s)

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

Which of the following statements concerning the electrorefining of copper in not true?

Aluminum requires relatively little protection from corrosion because

For a particular battery based on one of the following reactions,E is expected to remain constant with time until the cell reactants are almost completely consumed.Which is the appropriate reaction?

For a galvanic cell that uses the following two half-reactions, Cr₂O₇^2-(aq)+ 14 H⁺(aq)+ 6 e^- → 2 Cr³⁺(aq)+ 7 H₂O(l) Pb(s)→ Pb²⁺(aq)+ 2 e^- How many moles of Pb(s)are oxidized by three mol es of Cr₂O₇^2-?

The standard cell potential for the following galvanic cell is 1.21 V. Al(s)|Al³⁺(aq)||Fe²⁺(aq)|Fe(s) When [Al³⁺] = 0.10 M and [Fe²⁺] = 0.10 M,will the cell potential at 25°C be less than,the same as,or greater than 1.21 V?

For the hypothetical reaction A + 2 B^x → A^y + 2 B,E° = 1.50 V = and ΔG° = -305 kJ.For this reaction,if the value of x is 4,then the value of y = .

In order for a cell potential to be a standard cell potential,the concentration of all ions in solution must be M,the partial pressures of all gaseous species must be atm,and the temperature must be K.

For the galvanic cell Pt(s)∣ Sn²⁺(aq),Sn⁴⁺(aq)∣∣ Pb²⁺(aq)∣ Pb(s),what is the function of the Pt(s)?

Consider the galvanic cell shown below. -Identify the anode and cathode,and indicate the direction of ion flow to and from each electrode.

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)

Shown below are the reactions occurring in the proton-exchange membrane (PEM)fuel cell. I 2 H₂(g)→ 4 H⁺(aq)+ 4 e^- II O₂(g)+ 4 H⁺(aq)+ 4 e^- → 2 H₂O(l) Overall 2 H₂(g)+ O₂(g)→ 2 H₂O(l) Which is the cathode reaction,and what is being oxidized in the overall reaction?

Which of the following terms can be used to describe an electrochemical cell in which a spontaneous chemical reaction generates an electric current? I.an electrolytic cell II.a galvanic cell III.a voltaic cell

Chemistry: Matter and Measurement

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Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds and Molecular Structure

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Gases: Their Properties and Behavior

Liquids,solids,and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

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Hydrogen, oxygen, and Water

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Exam 17: Electrochemistry

If the cell reaction involves ions in solution,as the cell reaction in a galvanic cell continues,

For an electrolytic cell

The galvanic cell represented by the shorthand notation below contains KNO3(aq)in the salt bridge.During the reaction ________ ions flow into the anode compartment,and ________ ions flow into the cathode compartment. Pt(s)|H2(g)|H+(aq)|| Sn4+(aq)|Sn2+(aq)|Pt(s)

Calculate the value of the reaction quotient,Q,for the galvanic cell expressed using shorthand notation below.Use the balanced chemical equation that has the smallest whole number stoichiometric coefficients. Zn(s)∣ Zn2+(aq,0.0100 M)∣∣ Ag+(aq,1.15 M)∣ Ag(s)

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

Which of the following statements concerning the electrorefining of copper in not true?

Aluminum requires relatively little protection from corrosion because

For a particular battery based on one of the following reactions,E is expected to remain constant with time until the cell reactants are almost completely consumed.Which is the appropriate reaction?

For a galvanic cell that uses the following two half-reactions, Cr2O72-(aq)+ 14 H+(aq)+ 6 e- → 2 Cr3+(aq)+ 7 H2O(l) Pb(s)→ Pb2+(aq)+ 2 e- How many moles of Pb(s)are oxidized by three mol es of Cr2O72-?

The standard cell potential for the following galvanic cell is 1.21 V. Al(s)|Al3+(aq)||Fe2+(aq)|Fe(s) When [Al3+] = 0.10 M and [Fe2+] = 0.10 M,will the cell potential at 25°C be less than,the same as,or greater than 1.21 V?

For the hypothetical reaction A + 2 Bx → Ay + 2 B,E° = 1.50 V = and ΔG° = -305 kJ.For this reaction,if the value of x is 4,then the value of y = .

In order for a cell potential to be a standard cell potential,the concentration of all ions in solution must be ________ M,the partial pressures of all gaseous species must be ________ atm,and the temperature must be ________ K.

For the galvanic cell Pt(s)∣ Sn2+(aq),Sn4+(aq)∣∣ Pb2+(aq)∣ Pb(s),what is the function of the Pt(s)?

Consider the galvanic cell shown below. -Identify the anode and cathode,and indicate the direction of ion flow to and from each electrode.

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)

Shown below are the reactions occurring in the proton-exchange membrane (PEM)fuel cell. I 2 H2(g)→ 4 H+(aq)+ 4 e- II O2(g)+ 4 H+(aq)+ 4 e- → 2 H2O(l) Overall 2 H2(g)+ O2(g)→ 2 H2O(l) Which is the cathode reaction,and what is being oxidized in the overall reaction?

Which of the following terms can be used to describe an electrochemical cell in which a spontaneous chemical reaction generates an electric current? I.an electrolytic cell II.a galvanic cell III.a voltaic cell

Chemistry: Matter and Measurement

Atoms, molecules, and Ions

Formulas, equations, and Moles

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids,solids,and Phase Changes

Solutions and Their Properties

Chemical Kinetics

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

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Filters

The galvanic cell represented by the shorthand notation below contains KNO₃(aq)in the salt bridge.During the reaction ions flow into the anode compartment,and ions flow into the cathode compartment. Pt(s)|H₂(g)|H⁺(aq)|| Sn⁴⁺(aq)|Sn²⁺(aq)|Pt(s)

Calculate the value of the reaction quotient,Q,for the galvanic cell expressed using shorthand notation below.Use the balanced chemical equation that has the smallest whole number stoichiometric coefficients. Zn(s)∣ Zn²⁺(aq,0.0100 M)∣∣ Ag⁺(aq,1.15 M)∣ Ag(s)

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

For a galvanic cell that uses the following two half-reactions, Cr₂O₇^2-(aq)+ 14 H⁺(aq)+ 6 e^- → 2 Cr³⁺(aq)+ 7 H₂O(l) Pb(s)→ Pb²⁺(aq)+ 2 e^- How many moles of Pb(s)are oxidized by three mol es of Cr₂O₇^2-?

The standard cell potential for the following galvanic cell is 1.21 V. Al(s)|Al³⁺(aq)||Fe²⁺(aq)|Fe(s) When [Al³⁺] = 0.10 M and [Fe²⁺] = 0.10 M,will the cell potential at 25°C be less than,the same as,or greater than 1.21 V?

For the hypothetical reaction A + 2 B^x → A^y + 2 B,E° = 1.50 V = and ΔG° = -305 kJ.For this reaction,if the value of x is 4,then the value of y = .

In order for a cell potential to be a standard cell potential,the concentration of all ions in solution must be M,the partial pressures of all gaseous species must be atm,and the temperature must be K.

For the galvanic cell Pt(s)∣ Sn²⁺(aq),Sn⁴⁺(aq)∣∣ Pb²⁺(aq)∣ Pb(s),what is the function of the Pt(s)?

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)

Shown below are the reactions occurring in the proton-exchange membrane (PEM)fuel cell. I 2 H₂(g)→ 4 H⁺(aq)+ 4 e^- II O₂(g)+ 4 H⁺(aq)+ 4 e^- → 2 H₂O(l) Overall 2 H₂(g)+ O₂(g)→ 2 H₂O(l) Which is the cathode reaction,and what is being oxidized in the overall reaction?