Question 1

The Nernst equation can be used to calculate ________

Accepted Answer

A)  standard cell potentials from standard reduction potentials.
B)  the change in standard Gibbs free energy from standard cell potentials.
C)  cell potentials from standard cell potentials when the conditions of concentration and temperature are not standard.
D)  cell potentials given the temperature and reactant concentrations.
E)  cell potentials from standard oxidation potentials.F) A) and B)
G) None of the above

Question 2

Use the table of standard reduction potentials below to identify the metal or metal ion that is the strongest reducing agent.
4+ B) Pb2+ C) K+ D) K E) Al" class="answers-bank-image d-inline" rel="preload" >

Accepted Answer

A)  Pb4+
B)  Pb2+
C)  K+
D)  K
E)  AlF) A) and C)
G) None of the above

Question 3

Permanganate ions can oxidize sulfite in basic solution according to the following equation.The relevant standard reduction potentials are 0.59 V for the manganese half-reaction and -0.92 V for the sulfur half-reaction.Determine the cell potential for the reaction at 298 K with the concentrations in the table.
2 MnO4-(aq)+ 3 SO32-(aq)+ H2O(  )$\to$ 2 MnO2(s)+ 3 SO42-(aq)+ 2 OH-(aq)

Accepted Answer

The answer of Permanganate ions can oxidize sulfite in basic...

Question 4

What is the most important use for a standard hydrogen electrode?

Accepted Answer

It is used as a refe...

Question 5

A voltaic cell is constructed based on the reaction of Ag(CN) 2-(aq) with Cr(s) producing Ag(s) and Cr3+(s) .Identify the correct cell diagram.

Accepted Answer

A)  Ag(CN) 2-(aq) | Cr(s) || Ag(s) | Cr3+(aq) 
B)  Ag(s) | Cr3+(aq) || Ag(CN) 2-(aq) | Cr(s) 
C)  Cr(s) | Cr3+(aq) || Ag(s) | Ag(CN) 2-(aq) 
D)  Ag(CN) 2-(aq) | Ag(s) || Cr(s) | Cr3+(aq) 
E)  Cr(s) | Cr3+(aq) || Ag(CN) 2-(aq) | Ag(s) F) A) and B)
G) A) and D)

Question 6

The following reaction is called the "super iron reaction." In this reaction,identify (1)the reducing agent,(2)the oxidizing agent,and (3)the number of electrons transferred for the reaction as written,and (4)explain why it is called the "super iron reaction."
2 K2FeO4(aq)+ 3 Zn(s)$\to$Fe2O3(s)+ ZnO(s)+ 2 K2ZnO2(aq)

Accepted Answer

(1)Zinc metal is oxidized to Zn(II),so i...

Question 7

Electrochemical cell potentials can be used to determine equilibrium constants that would be otherwise difficult to determine because concentrations are small.Calculate the value of  Ksp for CdS from the following data.
 CdS(s) + 2 e-  →	o→  Cd(s) + S2-(aq) 
E° = -1.21 V
Cd2+(aq) + 2 e- →	o→  Cd(s) 
E° = -0.40 V

Accepted Answer

A)  4.06  ×	imes×  10-55
B)  4.32  ×	imes× 10-28
C)  2.08  ×	imes× 10-14
D)  2.31  ×	imes×  1027
E)  2.47  ×	imes×  1054 F) B) and C)
G) A) and B)

Question 8

A hydrogen fuel cell depends on ________

Accepted Answer

A)  fusion of hydrogen to produce deuterium.
B)  the acid-base chemistry of hydrogen.
C)  the redox chemistry of hydrogen.
D)  the kinetic energy of hydrogen gas.
E)  the enthalpy of vaporization of hydrogen.F) A) and D)
G) A) and E)

Question 9

Glancing at a periodic table,where do you expect to find elements that are good reducing agents?

Accepted Answer

A)  in groups 16 and 17
B)  on the left
C)  in the middle
D)  at the bottom
E)  in group 17F) A) and D)
G) B) and E)

Question 10

Calculate Ecell for an electrochemical cell based on the two half-reactions given below when the reaction occurs in an acidic aqueous solution in which the pH is buffered at 7.000 and [BrO3-] = 0.880 M,[Cl-] = 0.144 M,and cell for an electrochemical cell based on the two half-reactions given below when the reaction occurs in an acidic aqueous solution in which the pH is buffered at 7.000 and [BrO3-] = 0.880 M,[Cl-] = 0.144 M,and   = 0.260 atm.Use the smallest whole-number coefficients possible when balancing the overall reaction. BrO3- + 6 H+ + 5 e- 	o   Br2 + 3 H2O   +1.52 V Cl2 + 2 e- 	o  2 Cl- +1) 36 V A)  +0.69 V  B)  -0.37 V  C)  +2.35 V  D)  +0.12 V  E)  -0.27 V  " class="answers-bank-image d-inline" rel="preload" > = 0.260 atm.Use the smallest whole-number coefficients possible when balancing the overall reaction. BrO3- + 6 H+ + 5 e- →	o→ cell for an electrochemical cell based on the two half-reactions given below when the reaction occurs in an acidic aqueous solution in which the pH is buffered at 7.000 and [BrO3-] = 0.880 M,[Cl-] = 0.144 M,and   = 0.260 atm.Use the smallest whole-number coefficients possible when balancing the overall reaction. BrO3- + 6 H+ + 5 e- 	o   Br2 + 3 H2O   +1.52 V Cl2 + 2 e- 	o  2 Cl- +1) 36 V A)  +0.69 V  B)  -0.37 V  C)  +2.35 V  D)  +0.12 V  E)  -0.27 V  " class="answers-bank-image d-inline" rel="preload" > Br2 + 3 H2O cell for an electrochemical cell based on the two half-reactions given below when the reaction occurs in an acidic aqueous solution in which the pH is buffered at 7.000 and [BrO3-] = 0.880 M,[Cl-] = 0.144 M,and   = 0.260 atm.Use the smallest whole-number coefficients possible when balancing the overall reaction. BrO3- + 6 H+ + 5 e- 	o   Br2 + 3 H2O   +1.52 V Cl2 + 2 e- 	o  2 Cl- +1) 36 V A)  +0.69 V  B)  -0.37 V  C)  +2.35 V  D)  +0.12 V  E)  -0.27 V  " class="answers-bank-image d-inline" rel="preload" > +1.52 V
Cl2 + 2 e- →	o→  2 Cl-
+1) 36 V

Accepted Answer

A)  "+0.69 V"
B)  "-0.37 V"
C)  "+2.35 V"
D)  "+0.12 V"
E)  "-0.27 V" F) B) and E)
G) None of the above

Question 11

Balance the chemical equation for the following redox reaction under basic aqueous conditions with the smallest whole-number coefficients possible using the half-reaction method.How many moles of electrons are transferred in the balanced reaction? ClO3-(aq) + N2H4(g)  →	o→  Cl-(aq) + NO(g)

Accepted Answer

A)  6
B)  8
C)  16
D)  24
E)  48 F) C) and D)
G) A) and D)

Question 12

Electrolytic processes are used in a variety of applications.Which of the following does NOT involve electrolysis?

Accepted Answer

A)  recharging batteries
B)  electroplating metals
C)  forming highly reactive substances from salts
D)  producing hydrogen for fuel
E)  producing pottery in a furnaceF) A) and B)
G) A) and C)

Question 13

If 15 g of aluminum from an empty soda can could be used as an anode of a battery,how long could it supply a current of 10 amps?

Accepted Answer

A)  45 hr
B)  15 hr
C)  5.4 hr
D)  4.5 hr
E)  1.5 hrF) A) and B)
G) B) and D)

Question 14

Which statement does NOT correctly describe a standard hydrogen electrode (SHE) ?

Accepted Answer

A)  The SHE is assigned a standard reduction potential of exactly 1 V.
B)  2 H+(aq) + 2 e- →	o→  H2(g) 
C)  Pt | H2(g,1 atm) | H+(aq,1 M) ||
D)  || H+(aq,1 M) | H2(g,1 atm) | Pt
E)  The SHE consists of a platinum electrode immersed in an acid solution and a stream of hydrogen gas. F) A) and C)
G) A) and E)

Question 15

Oxidation refers to ________

Accepted Answer

A)  an increase in oxidation number.
B)  a decrease in oxidation number.
C)  a gain in the number of protons.
D)  an increase in the atomic number.
E)  an increase in mass.F) A) and D)
G) B) and C)

Question 16

The energy supplied by a battery can be determined by ________

Accepted Answer

A)  multiplying amperes supplied by seconds.
B)  dividing amperes supplied by seconds.
C)  multiplying coulombs supplied by volts.
D)  multiplying coulombs supplied by seconds.
E)  dividing coulombs supplied by seconds.F) A) and B)
G) C) and D)

Question 17

In a classroom demonstration of a redox reaction,a professor set up a voltaic cell with a copper metal anode and a silver metal cathode.The two electrodes were in contact with solutions of the corresponding metal ions,Cu2+ and Ag+.During the lecture,the crystals of silver metal deposited on the silver electrode as the copper solution turned a darker blue.The added silver crystals had a mass of 2.68 g after 50.0 minutes of lecture.What was the average current that the cell produced?

Accepted Answer

A)  0.799 A
B)  2.40 A
C)  47.9 A
D)  1.60 A
E)  0.479 AF) None of the above
G) A) and D)

Question 18

Which statement regarding voltaic cells is NOT correct?

Accepted Answer

A)  Reduction occurs at the cathode.
B)  Anions move through the barrier or bridge toward the electrode where oxidation is occurring.
C)  The electrode where reduction is occurring is represented by a positive sign.
D)  Electrons flow in the external circuit from the cathode to the anode.
E)  Electrons flow in the external circuit toward the electrode represented by a positive sign.F) A) and D)
G) D) and E)

Question 19

Using the following data,determine 42-(aq)  	o   Zn(OH) 2(s) + Cr(OH) 3(s)  Half-reaction Standard reduction potential Zn(OH) 2(s) + 2 e-  	o   Zn(s) + 2 OH-(aq)  -1.25 CrO42-(aq) + 4 H2O(   ) + 3 e- 	o  Cr(OH) 3(s) + 5 OH-(aq) -0.13 A)  -3.49 V  B)  +3.49 V  C)  +1.12 V  D)  -1.12 V  E)  +1.38 V  " class="answers-bank-image d-inline" rel="preload" > for the electrochemical cell constructed using the reaction of zinc and chromate ions under basic conditions.Unbalanced: Zn(s) + 2 CrO42-(aq)  →	o→   Zn(OH) 2(s) + Cr(OH) 3(s) 
Half-reaction Standard reduction potential
Zn(OH) 2(s) + 2 e-  →	o→   Zn(s) + 2 OH-(aq)  -1.25
CrO42-(aq) + 4 H2O( 42-(aq)  	o   Zn(OH) 2(s) + Cr(OH) 3(s)  Half-reaction Standard reduction potential Zn(OH) 2(s) + 2 e-  	o   Zn(s) + 2 OH-(aq)  -1.25 CrO42-(aq) + 4 H2O(   ) + 3 e- 	o  Cr(OH) 3(s) + 5 OH-(aq) -0.13 A)  -3.49 V  B)  +3.49 V  C)  +1.12 V  D)  -1.12 V  E)  +1.38 V  " class="answers-bank-image d-inline" rel="preload" > ) + 3 e- →	o→  Cr(OH) 3(s) + 5 OH-(aq) -0.13

Accepted Answer

A)  "-3.49 V"
B)  "+3.49 V"
C)  "+1.12 V"
D)  "-1.12 V"
E)  "+1.38 V" F) A) and E)
G) All of the above

Question 20

A concentration cell with a cell potential of +0.4759 V at 298 K is made using silver electrodes and aqueous silver ion solutions at 298 K.In one compartment,the Ag+ concentration is 1.000 M.In the other compartment,the Ag+ concentration is due to the dissolution of slightly soluble AgI.Calculate the value of Ksp for AgI.

Accepted Answer

A)  8.362  ×	imes× 10-17
B)  7.935  ×	imes×  10-4
C)  0.8827
D)  1.829  ×	imes×  10-8
E)  More information is needed. F) B) and E)
G) A) and E)

Exam 17: Electrochemistry-The Quest for Clean Energy

Glancing at a periodic table,where do you expect to find elements that are good reducing agents?

Correct Answer
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A hydrogen fuel cell depends on ________

Correct Answer
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Correct Answer
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Which statement does NOT correctly describe a standard hydrogen electrode (SHE) ?

Correct Answer
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Use the table of standard reduction potentials below to identify the metal or metal ion that is the strongest reducing agent.

Correct Answer
verified

If 15 g of aluminum from an empty soda can could be used as an anode of a battery,how long could it supply a current of 10 amps?

Correct Answer
verified

Balance the chemical equation for the following redox reaction under basic aqueous conditions with the smallest whole-number coefficients possible using the half-reaction method.How many moles of electrons are transferred in the balanced reaction? ClO₃^-(aq) + N₂H₄(g) $\to$ Cl^-(aq) + NO(g)

Correct Answer
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Electrolytic processes are used in a variety of applications.Which of the following does NOT involve electrolysis?

Correct Answer
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Which statement regarding voltaic cells is NOT correct?

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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A voltaic cell is constructed based on the reaction of Ag(CN) ₂^-(aq) with Cr(s) producing Ag(s) and Cr³⁺(s) .Identify the correct cell diagram.

Correct Answer
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Correct Answer
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(1)Zinc metal is oxidized to Zn(II),so i...
View Answer

Correct Answer
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The Nernst equation can be used to calculate ________

Correct Answer
verified

The energy supplied by a battery can be determined by ________

Correct Answer
verified

What is the most important use for a standard hydrogen electrode?

Correct Answer
verified
It is used as a refe...
View Answer

Oxidation refers to ________

Correct Answer
verified

Exam 17: Electrochemistry-The Quest for Clean Energy

Glancing at a periodic table,where do you expect to find elements that are good reducing agents?

Correct AnswerverifiedShow Answer

A hydrogen fuel cell depends on ________

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Which statement does NOT correctly describe a standard hydrogen electrode (SHE) ?

Correct AnswerverifiedShow Answer

Use the table of standard reduction potentials below to identify the metal or metal ion that is the strongest reducing agent.

Correct AnswerverifiedShow Answer

If 15 g of aluminum from an empty soda can could be used as an anode of a battery,how long could it supply a current of 10 amps?

Correct AnswerverifiedShow Answer

Balance the chemical equation for the following redox reaction under basic aqueous conditions with the smallest whole-number coefficients possible using the half-reaction method.How many moles of electrons are transferred in the balanced reaction? ClO3-(aq) + N2H4(g) →\to→ Cl-(aq) + NO(g)

Correct AnswerverifiedShow Answer

Electrolytic processes are used in a variety of applications.Which of the following does NOT involve electrolysis?

Correct AnswerverifiedShow Answer

Which statement regarding voltaic cells is NOT correct?

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

Correct AnswerverifiedShow Answer

A voltaic cell is constructed based on the reaction of Ag(CN) 2-(aq) with Cr(s) producing Ag(s) and Cr3+(s) .Identify the correct cell diagram.

Correct AnswerverifiedShow Answer

Correct Answerverified(1)Zinc metal is oxidized to Zn(II),so i...View AnswerShow Answer

Correct AnswerverifiedShow Answer

The Nernst equation can be used to calculate ________

Correct AnswerverifiedShow Answer

The energy supplied by a battery can be determined by ________

Correct AnswerverifiedShow Answer

What is the most important use for a standard hydrogen electrode?

Correct AnswerverifiedIt is used as a refe...View AnswerShow Answer

Oxidation refers to ________

Correct AnswerverifiedShow Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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Balance the chemical equation for the following redox reaction under basic aqueous conditions with the smallest whole-number coefficients possible using the half-reaction method.How many moles of electrons are transferred in the balanced reaction? ClO₃^-(aq) + N₂H₄(g) $\to$ Cl^-(aq) + NO(g)

Correct Answer
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Correct Answer
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A voltaic cell is constructed based on the reaction of Ag(CN) ₂^-(aq) with Cr(s) producing Ag(s) and Cr³⁺(s) .Identify the correct cell diagram.

Correct Answer
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Correct Answer
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(1)Zinc metal is oxidized to Zn(II),so i...
View Answer

Correct Answer
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Correct Answer
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Correct Answer
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Correct Answer
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It is used as a refe...
View Answer

Correct Answer
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