Chapter 17 - Electrochemistry

Frage 1 von 38

1

What is the oxidation number of bromine in the BrO3- ion?

Wähle eine der folgenden:

A) -1
B) +1
C) +3
D) +5
E) +7

Erklärung

Frage 2 von 38

1

What is the oxidation number of sulfur in the HSO4- ion?

Wähle eine der folgenden:

A) -2
B) +1
C) +2
D) +4
E) +6

Erklärung

Frage 3 von 38

1

Which element is oxidized in the reaction below?

Fe(CO)5 (l) + 2HI (g) → Fe(CO)4I2 (s) + CO (g) + H2 (g)

Wähle eine der folgenden:

A) Fe
B) C
C) O
D) H
E) I

Erklärung

Frage 4 von 38

1

Which element is reduced in the reaction below?

Fe(CO)5 (l) + 2HI (g) → Fe(CO)4I2 (s) + CO (g) + H2 (g)

Wähle eine der folgenden:

A) Fe
B) C
C) O
D) H
E) I

Erklärung

Frage 5 von 38

1

Which of the following reactions is a redox reaction?

(a) K2CrO4 + BaCl2 → BaCrO4 + 2KCl
(b) Pb22+ + 2Br- → PbBr
(c) Cu + S → CuS

Wähle eine der folgenden:

A) (a) only
B) (b) only
C) (c) only
D) (a) and (c)
E) (b) and (c)

Erklärung

Frage 6 von 38

1

Which one of the following reactions is a redox reaction?

Wähle eine der folgenden:

A) NaOH + HCl → NaCl + H2O
B) Pb2+ + 2Cl- → PbCl2
C) AgNO3 + HCl → HNO3 + AgCl
D) None of the above is a redox reaction.

Erklärung

Frage 7 von 38

1

Which substance is the reducing agent in the following reaction?
Fe2S3 + 12HNO3 → 2Fe(NO3)3 + 3S + 6NO2 + 6H2O

Wähle eine der folgenden:

A) HNO3
B) S
C) NO2
D) Fe2S3
E) H2O

Erklärung

Frage 8 von 38

1

What is the coefficient of the permanganate ion when the following equation is balanced?
MnO4- + Br- → Mn2+ + Br2 (acidic solution)

Wähle eine der folgenden:

A) 1
B) 2
C) 3
D) 5
E) 4

Erklärung

Frage 9 von 38

1

What is the coefficient of Fe3+ when the following equation is balanced?
CN- + Fe3+ → CNO- + Fe2+ (basic solution)

Wähle eine der folgenden:

A) 1
B) 2
C) 3
D) 4
E) 5

Erklärung

Frage 10 von 38

1

The purpose of the salt bridge in an electrochemical cell is to __________.

Wähle eine der folgenden:

A) maintain electrical neutrality in the half-cells via migration of ions.
B) provide a source of ions to react at the anode and cathode.
C) provide oxygen to facilitate oxidation at the anode.
D) provide a means for electrons to travel from the anode to the cathode.
E) provide a means for electrons to travel from the cathode to the anode.

Erklärung

Frage 11 von 38

1

Which transformation could take place at the anode of an electrochemical cell?

Wähle eine der folgenden:

A) NO → NO3-
B) CO2 → Cr2O42-
C) VO2+ → VO2+
D) H2AsO4 → H3AsO3
E) O2 → H2O2

Erklärung

Frage 12 von 38

1

Which transformation could take place at the cathode of an electrochemical cell?

Wähle eine der folgenden:

A) MnO2 → MnO4-
B) Br2 → BrO3-
C) NO → HNO2
D) HSO4- → H2SO3
E) Mn2+ → MnO4-

Erklärung

Frage 13 von 38

1

Which of the halogens in Table 20.1 is the strongest oxidizing agent?

Wähle eine der folgenden:

A) Cl2
B) Br2
C) F2
D) I2
E) All of the halogens have equal strength as oxidizing agents.

Erklärung

Frage 14 von 38

1

Which one of the following types of elements is most likely to be a good oxidizing agent?

Wähle eine der folgenden:

A) alkali metals
B) lanthanides
C) alkaline earth elements
D) transition elements
E) halogens

Erklärung

Frage 15 von 38

1

Which one of the following is the best oxidizing agent?

Wähle eine der folgenden:

A) H2
B) Na
C) O2
D) Li
E) Ca

Erklärung

Frage 16 von 38

1

Which of the following reactions will occur spontaneously as written?

Wähle eine der folgenden:

A) Sn4+ (aq) + Fe3+ (aq) → Sn2+ (aq) + Fe2+ (aq)
B) 3Fe (s) + 2Cr3+ (aq) → 2Cr (s) + 3Fe2+ (aq)
C) Sn4+ (aq) + Fe2+ (aq) → Sn2+ (aq) + Fe (s) ← I chose this one
D) 3Sn4+ (aq) + 2Cr (s) → 2Cr3+ (aq) + 3Sn2+ (aq)
E) 3Fe2+ (aq) → Fe (s) + 2Fe3+ (aq)

Erklärung

Frage 17 von 38

1

Consider an electrochemical cell based on the reaction:

2H+ (aq) + Sn (s) → Sn2+ (aq) + H2 (g)

Which of the following actions would change the measured cell potential?

Wähle eine der folgenden:

A) increasing the pH in the cathode compartment
B) lowering the pH in the cathode compartment
C) increasing the [Sn2+] in the anode compartment
D) increasing the pressure of hydrogen gas in the cathode compartment
E) Any of the above will change the measure cell potential.

Erklärung

Frage 18 von 38

1

Consider an electrochemical cell based on the reaction:

2H+ (aq) + Sn (s) → Sn2+ (aq) + H2 (g)

Which of the following actions would not change the measured cell potential?

Wähle eine der folgenden:

A) lowering the pH in the cathode compartment
B) addition of more tin metal to the anode compartment
C) increasing the tin (II) ion concentration in the anode compartment
D) increasing the pressure of hydrogen gas in the cathode compartment
E) Any of the above will change the measured cell potential.

Erklärung

Frage 19 von 38

1

Cathodic protection of a metal pipe against corrosion usually entails

Wähle eine der folgenden:

A) attaching an active metal to make the pipe the anode in an electrochemical cell.
B) coating the pipe with another metal whose standard reduction potential is less negative than that of the pipe.
C) attaching an active metal to make the pipe the cathode in an electrochemical cell.
D) attaching a dry cell to reduce any metal ions which might be formed.
E) coating the pipe with a fluoropolymer to act as a source of fluoride ion (since the latter is so hard to oxidize).

Erklärung

Frage 20 von 38

1

One of the differences between a voltaic cell and an electrolytic cell is that in an electrolytic cell __________.

Wähle eine der folgenden:

A) an electric current is produced by a chemical reaction
B) electrons flow toward the anode
C) a nonspontaneous reaction is forced to occur
D) O2 gas is produced at the cathode
E) oxidation occurs at the cathode

Erklärung

Frage 21 von 38

1

__________ is reduced in the following reaction:

Cr2O72- + 6S2O32- + 14H+ → 2Cr3+ + 3S4O62- + 7H2O

Wähle eine der folgenden:

A) Cr6+
B) S2+
C) H+
D) O2-
E) S4O62-

Erklärung

Frage 22 von 38

1

Which substance is serving as the oxidizing agent in the following reaction?

14H+ + Cr2O72- + 3Ni → 3Ni2+ + 2Cr3+ + 7H2O

Wähle eine der folgenden:

A) Ni
B) H+
C) Cr2O72-
D) H2O
E) Ni2+

Erklärung

Frage 23 von 38

1

__________ electrons appear in the following half-reaction when it is balanced.

S4O62- → S2O32-

Wähle eine der folgenden:

A) 6
B) 2
C) 4
D) 1
E) 3

Erklärung

Frage 24 von 38

1

The balanced half-reaction in which dichromate ion is reduced to chromium metal is a __________ process.

Wähle eine der folgenden:

A) two-electron
B) six-electron
C) three-electron
D) four-electron
E) twelve-electron

Erklärung

Frage 25 von 38

1

The electrode at which oxidation occurs is called the __________.

Wähle eine der folgenden:

A) oxidizing agent
B) cathode
C) reducing agent
D) anode
E) voltaic cell

Erklärung

Frage 26 von 38

1

In a voltaic cell, electrons flow from the to the .

Wähle eine der folgenden:

A) salt bride, anode
B) anode, salt bridge
C) cathode, anode
D) salt bridge, cathode
E) anode, cathode

Erklärung

Frage 27 von 38

1

The standard cell potential (E°cell) for the voltaic cell based on the reaction below is __________ V.
Sn2+ (aq) + 2Fe3+ (aq) → 2Fe2+ (aq) + Sn4+ (aq)

Wähle eine der folgenden:

A) +0.46
B) +0.617
C) +1.39
D) -0.46
E) +1.21

Erklärung

Frage 28 von 38

1

The standard cell potential (E°cell) for the voltaic cell based on the reaction below is __________ V.

Cr (s) + 3Fe3+ (aq) → 3Fe2+ (aq) + Cr3+ (aq)

Wähle eine der folgenden:

A) -1.45
B) +2.99
C) +1.51
D) +3.05
E) +1.57

Erklärung

Frage 29 von 38

1

The standard cell potential (E°cell) of the reaction below is +0.126 V. The value of ΔG° for the reaction is __________ kJ/mol.

Pb (s) + 2H+ (aq) → Pb2+ (aq) + H2 (g)

Wähle eine der folgenden:

A) -24.3
B) +24.3
C) -12.6
D) +12.6
E) -50.8

Erklärung

Frage 30 von 38

1

The standard cell potential (E°cell) of the reaction below is -0.34 V. The value of ΔG° for the reaction is __________ kJ/mol.

Cu (s) + 2H+ (aq) → Cu2+ (aq) + H2 (g)

Wähle eine der folgenden:

A) -0.34
B) +66
C) -130
D) +130
E) none of the above

Erklärung

Frage 31 von 38

1

The standard cell potential (E°cell) of the reaction below is +1.34 V. The value of ΔG° for the reaction is __________ kJ/mol.

3Cu (s) + 2MnO4- (aq) + 8H+ (aq) → 3Cu2+ (aq) + 2MnO2 (s) + 4H2O (l)

Wähle eine der folgenden:

A) -24.3
B) +259
C) -259
D) +776
E) none of the above

Erklärung

Frage 32 von 38

1

Galvanized iron is iron coated with __________.

Wähle eine der folgenden:

A) magnesium.
B) zinc.
C) chromium.
D) phosphate.
E) iron oxide.

Erklärung

Frage 33 von 38

1

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.

Wähle eine der folgenden:

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

Erklärung

Frage 34 von 38

1

A voltaic cell is constructed with two silver-silver chloride electrodes, where the half-reaction is

AgCl (s) + e- → Ag (s) + Cl- (aq) E° = +0.222 V

The concentrations of chloride ion in the two compartments are 0.0222 M and 2.22 M, respectively. The cell emf is __________ V.

Wähle eine der folgenden:

A) 0.212
B) 0.118
C) 0.00222
D) 22.2
E) 0.232

Erklärung

Frage 35 von 38

1

The standard cell potential (E°cell) for the reaction below is +0.63 V. The cell potential for this reaction is __________ V when [Zn2+] = 3.5 M and [Pb2+] = 2.0 × 10-4 M.

Pb2+ (aq) + Zn (s) → Zn2+ (aq) + Pb (s)

Wähle eine der folgenden:

A) 0.50
B) 0.84
C) 0.39
D) 0.76
E) 0.63

Erklärung

Frage 36 von 38

1

The standard emf for the cell using the overall cell reaction below is +2.20 V:

2Al (s) + 3I2 (s) → 2Al3+ (aq) + 6I- (aq)

The emf generated by the cell when [Al3+] = 4.5 × 10-3 M and [I-] = 0.15 M is ________ V.

Wähle eine der folgenden:

A) 2.20
B) 2.32
C) 2.10
D) 2.39
E) 2.23

Erklärung

Frage 37 von 38

1

The most difficult species to reduce and the poorest oxidizing agent is __________.

Wähle eine der folgenden:

A) Fr+
B) F-
C) Li+
D) He

Erklärung

Frage 38 von 38

1

In a half reaction the amount of a substance that is reduced or oxidized is directly proportional to the number of electrons generated in the cell.

Wähle eine der folgenden:

True
False

	Erstellt von Dawn G vor fast 8 Jahre

Originally chapter 20

Chapter 17 - Electrochemistry

Chapter 17 - Electrochemistry

Frage 1 von 38

What is the oxidation number of bromine in the BrO3- ion?

Wähle eine der folgenden:

Erklärung

Frage 2 von 38

What is the oxidation number of sulfur in the HSO4- ion?

Wähle eine der folgenden:

Erklärung

Frage 3 von 38

Which element is oxidized in the reaction below? Fe(CO)5 (l) + 2HI (g) → Fe(CO)4I2 (s) + CO (g) + H2 (g)

Wähle eine der folgenden:

Erklärung

Frage 4 von 38

Which element is reduced in the reaction below? Fe(CO)5 (l) + 2HI (g) → Fe(CO)4I2 (s) + CO (g) + H2 (g)

Wähle eine der folgenden:

Erklärung

Frage 5 von 38

Which of the following reactions is a redox reaction? (a) K2CrO4 + BaCl2 → BaCrO4 + 2KCl (b) Pb22+ + 2Br- → PbBr (c) Cu + S → CuS

Wähle eine der folgenden:

Erklärung

Frage 6 von 38

Which one of the following reactions is a redox reaction?

Wähle eine der folgenden:

Erklärung

Frage 7 von 38

Which substance is the reducing agent in the following reaction? Fe2S3 + 12HNO3 → 2Fe(NO3)3 + 3S + 6NO2 + 6H2O

Wähle eine der folgenden:

Erklärung

Frage 8 von 38

What is the coefficient of the permanganate ion when the following equation is balanced? MnO4- + Br- → Mn2+ + Br2 (acidic solution)

Wähle eine der folgenden:

Erklärung

Frage 9 von 38

What is the coefficient of Fe3+ when the following equation is balanced? CN- + Fe3+ → CNO- + Fe2+ (basic solution)

Wähle eine der folgenden:

Erklärung

Frage 10 von 38

The purpose of the salt bridge in an electrochemical cell is to __________.

Wähle eine der folgenden:

Erklärung

Frage 11 von 38

Which transformation could take place at the anode of an electrochemical cell?

Wähle eine der folgenden:

Erklärung

Frage 12 von 38

Which transformation could take place at the cathode of an electrochemical cell?

Wähle eine der folgenden:

Erklärung

Frage 13 von 38

Which of the halogens in Table 20.1 is the strongest oxidizing agent?

Wähle eine der folgenden:

Erklärung

Frage 14 von 38

Which one of the following types of elements is most likely to be a good oxidizing agent?

Wähle eine der folgenden:

Erklärung

Frage 15 von 38

Which one of the following is the best oxidizing agent?

Wähle eine der folgenden:

Erklärung

Frage 16 von 38

Which of the following reactions will occur spontaneously as written?

Wähle eine der folgenden:

Erklärung

Frage 17 von 38

Consider an electrochemical cell based on the reaction: 2H+ (aq) + Sn (s) → Sn2+ (aq) + H2 (g) Which of the following actions would change the measured cell potential?

Wähle eine der folgenden:

Erklärung

Frage 18 von 38

Consider an electrochemical cell based on the reaction: 2H+ (aq) + Sn (s) → Sn2+ (aq) + H2 (g) Which of the following actions would not change the measured cell potential?

Wähle eine der folgenden:

Erklärung

Frage 19 von 38

Cathodic protection of a metal pipe against corrosion usually entails

Wähle eine der folgenden:

Erklärung

Frage 20 von 38

Which element is oxidized in the reaction below?

Fe(CO)5 (l) + 2HI (g) → Fe(CO)4I2 (s) + CO (g) + H2 (g)

Which element is reduced in the reaction below?

Fe(CO)5 (l) + 2HI (g) → Fe(CO)4I2 (s) + CO (g) + H2 (g)

Which of the following reactions is a redox reaction?

(a) K2CrO4 + BaCl2 → BaCrO4 + 2KCl
(b) Pb22+ + 2Br- → PbBr
(c) Cu + S → CuS

Which substance is the reducing agent in the following reaction?
Fe2S3 + 12HNO3 → 2Fe(NO3)3 + 3S + 6NO2 + 6H2O

What is the coefficient of the permanganate ion when the following equation is balanced?
MnO4- + Br- → Mn2+ + Br2 (acidic solution)

What is the coefficient of Fe3+ when the following equation is balanced?
CN- + Fe3+ → CNO- + Fe2+ (basic solution)

Consider an electrochemical cell based on the reaction:

2H+ (aq) + Sn (s) → Sn2+ (aq) + H2 (g)

Which of the following actions would change the measured cell potential?

Consider an electrochemical cell based on the reaction:

2H+ (aq) + Sn (s) → Sn2+ (aq) + H2 (g)

Which of the following actions would not change the measured cell potential?

__________ is reduced in the following reaction:

Cr2O72- + 6S2O32- + 14H+ → 2Cr3+ + 3S4O62- + 7H2O

Which substance is serving as the oxidizing agent in the following reaction?

14H+ + Cr2O72- + 3Ni → 3Ni2+ + 2Cr3+ + 7H2O

__________ electrons appear in the following half-reaction when it is balanced.

S4O62- → S2O32-

In a voltaic cell, electrons flow from the to the .

The standard cell potential (E°cell) for the voltaic cell based on the reaction below is __________ V.
Sn2+ (aq) + 2Fe3+ (aq) → 2Fe2+ (aq) + Sn4+ (aq)

The standard cell potential (E°cell) for the voltaic cell based on the reaction below is __________ V.

Cr (s) + 3Fe3+ (aq) → 3Fe2+ (aq) + Cr3+ (aq)

The standard cell potential (E°cell) of the reaction below is +0.126 V. The value of ΔG° for the reaction is __________ kJ/mol.

Pb (s) + 2H+ (aq) → Pb2+ (aq) + H2 (g)

The standard cell potential (E°cell) of the reaction below is -0.34 V. The value of ΔG° for the reaction is __________ kJ/mol.

Cu (s) + 2H+ (aq) → Cu2+ (aq) + H2 (g)

The standard cell potential (E°cell) of the reaction below is +1.34 V. The value of ΔG° for the reaction is __________ kJ/mol.

3Cu (s) + 2MnO4- (aq) + 8H+ (aq) → 3Cu2+ (aq) + 2MnO2 (s) + 4H2O (l)

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.

A voltaic cell is constructed with two silver-silver chloride electrodes, where the half-reaction is

AgCl (s) + e- → Ag (s) + Cl- (aq) E° = +0.222 V

The concentrations of chloride ion in the two compartments are 0.0222 M and 2.22 M, respectively. The cell emf is __________ V.

The standard cell potential (E°cell) for the reaction below is +0.63 V. The cell potential for this reaction is __________ V when [Zn2+] = 3.5 M and [Pb2+] = 2.0 × 10-4 M.

Pb2+ (aq) + Zn (s) → Zn2+ (aq) + Pb (s)

The standard emf for the cell using the overall cell reaction below is +2.20 V:

2Al (s) + 3I2 (s) → 2Al3+ (aq) + 6I- (aq)

The emf generated by the cell when [Al3+] = 4.5 × 10-3 M and [I-] = 0.15 M is ________ V.