7243258
Frage 1
Frage
What is the oxidation number of bromine in the BrO3- ion?
Antworten
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A) -1
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B) +1
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C) +3
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D) +5
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E) +7
Frage 2
Frage
What is the oxidation number of sulfur in the HSO4- ion?
Antworten
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A) -2
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B) +1
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C) +2
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D) +4
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E) +6
Frage 3
Frage
Which element is oxidized in the reaction below?
Fe(CO)5 (l) + 2HI (g) → Fe(CO)4I2 (s) + CO (g) + H2 (g)
Antworten
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A) Fe
-
B) C
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C) O
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D) H
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E) I
Frage 4
Frage
Which element is reduced in the reaction below?
Fe(CO)5 (l) + 2HI (g) → Fe(CO)4I2 (s) + CO (g) + H2 (g)
Antworten
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A) Fe
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B) C
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C) O
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D) H
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E) I
Frage 5
Frage
Which of the following reactions is a redox reaction?
(a) K2CrO4 + BaCl2 → BaCrO4 + 2KCl
(b) Pb22+ + 2Br- → PbBr
(c) Cu + S → CuS
Antworten
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A) (a) only
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B) (b) only
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C) (c) only
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D) (a) and (c)
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E) (b) and (c)
Frage 6
Frage
Which one of the following reactions is a redox reaction?
Antworten
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A) NaOH + HCl → NaCl + H2O
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B) Pb2+ + 2Cl- → PbCl2
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C) AgNO3 + HCl → HNO3 + AgCl
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D) None of the above is a redox reaction.
Frage 7
Frage
Which substance is the reducing agent in the following reaction?
Fe2S3 + 12HNO3 → 2Fe(NO3)3 + 3S + 6NO2 + 6H2O
Antworten
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A) HNO3
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B) S
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C) NO2
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D) Fe2S3
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E) H2O
Frage 8
Frage
What is the coefficient of the permanganate ion when the following equation is balanced?
MnO4- + Br- → Mn2+ + Br2 (acidic solution)
Antworten
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A) 1
-
B) 2
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C) 3
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D) 5
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E) 4
Frage 9
Frage
What is the coefficient of Fe3+ when the following equation is balanced?
CN- + Fe3+ → CNO- + Fe2+ (basic solution)
Antworten
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A) 1
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B) 2
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C) 3
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D) 4
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E) 5
Frage 10
Frage
The purpose of the salt bridge in an electrochemical cell is to __________.
Antworten
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A) maintain electrical neutrality in the half-cells via migration of ions.
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B) provide a source of ions to react at the anode and cathode.
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C) provide oxygen to facilitate oxidation at the anode.
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D) provide a means for electrons to travel from the anode to the cathode.
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E) provide a means for electrons to travel from the cathode to the anode.
Frage 11
Frage
Which transformation could take place at the anode of an electrochemical cell?
Antworten
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A) NO → NO3-
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B) CO2 → Cr2O42-
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C) VO2+ → VO2+
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D) H2AsO4 → H3AsO3
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E) O2 → H2O2
Frage 12
Frage
Which transformation could take place at the cathode of an electrochemical cell?
Antworten
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A) MnO2 → MnO4-
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B) Br2 → BrO3-
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C) NO → HNO2
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D) HSO4- → H2SO3
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E) Mn2+ → MnO4-
Frage 13
Frage
Which of the halogens in Table 20.1 is the strongest oxidizing agent?
Antworten
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A) Cl2
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B) Br2
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C) F2
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D) I2
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E) All of the halogens have equal strength as oxidizing agents.
Frage 14
Frage
Which one of the following types of elements is most likely to be a good oxidizing agent?
Antworten
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A) alkali metals
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B) lanthanides
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C) alkaline earth elements
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D) transition elements
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E) halogens
Frage 15
Frage
Which one of the following is the best oxidizing agent?
Antworten
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A) H2
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B) Na
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C) O2
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D) Li
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E) Ca
Frage 16
Frage
Which of the following reactions will occur spontaneously as written?
Antworten
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A) Sn4+ (aq) + Fe3+ (aq) → Sn2+ (aq) + Fe2+ (aq)
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B) 3Fe (s) + 2Cr3+ (aq) → 2Cr (s) + 3Fe2+ (aq)
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C) Sn4+ (aq) + Fe2+ (aq) → Sn2+ (aq) + Fe (s) ← I chose this one
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D) 3Sn4+ (aq) + 2Cr (s) → 2Cr3+ (aq) + 3Sn2+ (aq)
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E) 3Fe2+ (aq) → Fe (s) + 2Fe3+ (aq)
Frage 17
Frage
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?
Antworten
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A) increasing the pH in the cathode compartment
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B) lowering the pH in the cathode compartment
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C) increasing the [Sn2+] in the anode compartment
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D) increasing the pressure of hydrogen gas in the cathode compartment
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E) Any of the above will change the measure cell potential.
Frage 18
Frage
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?
Antworten
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A) lowering the pH in the cathode compartment
-
B) addition of more tin metal to the anode compartment
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C) increasing the tin (II) ion concentration in the anode compartment
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D) increasing the pressure of hydrogen gas in the cathode compartment
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E) Any of the above will change the measured cell potential.
Frage 19
Frage
Cathodic protection of a metal pipe against corrosion usually entails
Antworten
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A) attaching an active metal to make the pipe the anode in an electrochemical cell.
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B) coating the pipe with another metal whose standard reduction potential is less negative than that of the pipe.
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C) attaching an active metal to make the pipe the cathode in an electrochemical cell.
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D) attaching a dry cell to reduce any metal ions which might be formed.
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E) coating the pipe with a fluoropolymer to act as a source of fluoride ion (since the latter is so hard to oxidize).
Frage 20
Frage
One of the differences between a voltaic cell and an electrolytic cell is that in an electrolytic cell __________.
Antworten
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A) an electric current is produced by a chemical reaction
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B) electrons flow toward the anode
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C) a nonspontaneous reaction is forced to occur
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D) O2 gas is produced at the cathode
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E) oxidation occurs at the cathode
Frage 21
Frage
__________ is reduced in the following reaction:
Cr2O72- + 6S2O32- + 14H+ → 2Cr3+ + 3S4O62- + 7H2O
Antworten
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A) Cr6+
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B) S2+
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C) H+
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D) O2-
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E) S4O62-
Frage 22
Frage
Which substance is serving as the oxidizing agent in the following reaction?
14H+ + Cr2O72- + 3Ni → 3Ni2+ + 2Cr3+ + 7H2O
Antworten
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A) Ni
-
B) H+
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C) Cr2O72-
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D) H2O
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E) Ni2+
Frage 23
Frage
__________ electrons appear in the following half-reaction when it is balanced.
S4O62- → S2O32-
Antworten
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A) 6
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B) 2
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C) 4
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D) 1
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E) 3
Frage 24
Frage
The balanced half-reaction in which dichromate ion is reduced to chromium metal is a __________ process.
Antworten
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A) two-electron
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B) six-electron
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C) three-electron
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D) four-electron
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E) twelve-electron
Frage 25
Frage
The electrode at which oxidation occurs is called the __________.
Antworten
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A) oxidizing agent
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B) cathode
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C) reducing agent
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D) anode
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E) voltaic cell
Frage 26
Frage
In a voltaic cell, electrons flow from the __________ to the __________.
Antworten
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A) salt bride, anode
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B) anode, salt bridge
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C) cathode, anode
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D) salt bridge, cathode
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E) anode, cathode
Frage 27
Frage
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)
Antworten
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A) +0.46
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B) +0.617
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C) +1.39
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D) -0.46
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E) +1.21
Frage 28
Frage
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)
Antworten
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A) -1.45
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B) +2.99
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C) +1.51
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D) +3.05
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E) +1.57
Frage 29
Frage
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)
Antworten
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A) -24.3
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B) +24.3
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C) -12.6
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D) +12.6
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E) -50.8
Frage 30
Frage
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)
Antworten
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A) -0.34
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B) +66
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C) -130
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D) +130
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E) none of the above
Frage 31
Frage
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)
Antworten
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A) -24.3
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B) +259
-
C) -259
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D) +776
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E) none of the above
Frage 32
Frage
Galvanized iron is iron coated with __________.
Antworten
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A) magnesium.
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B) zinc.
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C) chromium.
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D) phosphate.
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E) iron oxide.
Frage 33
Frage
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.
Antworten
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A) 2.0 × 10-2
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B) 4.2 × 10-4
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C) 1.4 × 10-1
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D) 4.9 × 101
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E) 1.0 × 10-12
Frage 34
Frage
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.
Antworten
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A) 0.212
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B) 0.118
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C) 0.00222
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D) 22.2
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E) 0.232
Frage 35
Frage
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)
Antworten
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A) 0.50
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B) 0.84
-
C) 0.39
-
D) 0.76
-
E) 0.63
Frage 36
Frage
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.
Antworten
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A) 2.20
-
B) 2.32
-
C) 2.10
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D) 2.39
-
E) 2.23
Frage 37
Frage
The most difficult species to reduce and the poorest oxidizing agent is __________.
Antworten
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A) Fr+
-
B) F-
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C) Li+
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D) He
Frage 38
Frage
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.
Antworten
-
True
-
False
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