Question 13

1
Question 13

• Given the following notation for an
  electrochemical cell
• Pt(s) H2(g) H(aq) Ag(aq) Ag(s),
• what is the balanced overall (net) cell
  reaction?
• A) 2H(aq) 2Ag(aq) --gt H2(g) 2Ag(s)
• B) H2(g) 2Ag(s) --gt H(aq) 2Ag(aq)
• C) 2H(aq) 2Ag(s) --gt H2(g) 2Ag(aq)
• D) H2(g) Ag(aq) --gt H(aq) Ag(s)
• E) H2(g) 2Ag(aq) --gt 2H(aq) 2Ag(s)

2
Question 14

• Consider an electrochemical cell constructed from
  the following half cells, linked by an
• external circuit and by a KCl salt bridge.
• - an Al(s) electrode in 1.0 M Al(NO3)3 solution
• - a Pb(s) electrode in 1.0 M Pb(NO3)2 solution
• The balanced overall (net) cell reaction is
• A) Pb(s) Al3(aq) --gt Pb2(aq) Al(s.)
• B) 3Pb(s) 2Al3(aq) --gt 3Pb2(aq) 2Al(s).
• C) 3Pb2(aq) 2Al(s) --gt 3Pb(s) 2Al3(aq).
• D) Pb2(aq) Al(s) --gt Pb(s) Al3(aq).

3
Question 15

• Consider an electrochemical cell constructed from
  the following half cells, linked by a KCl
• salt bridge.
• - an Al(s) electrode in 0.5 M Al2(SO4)3 solution
• - a Pb(s) electrode in 1.0 M Pb(NO3)2 solution
• Which electrode is the anode?
• A) Al
• B) Pb
• C) Neither

4
Question 16

• Consider an electrochemical cell constructed from
  the following half cells, linked by a KCl salt
  bridge.
• - a Fe electrode in 1.0 M FeCl2 solution
• - a Sn electrode in 1.0 M Sn(NO3 )2 solution
• When the cell is running spontaneously, which
  choice includes only true statements and no false
  ones?
• A) The tin electrode loses mass and the tin
  electrode is the cathode.
• B) The tin electrode gains mass and the tin
  electrode is the cathode.
• C) The iron electrode gains mass and the iron
  electrode is the anode.
• D) The iron electrode loses mass and the iron
  electrode is the cathode.
• E) The iron electrode gains mass and the iron
  electrode is the cathode.

5
Question 18

• A certain electrochemical cell has for its cell
  reaction
• Zn HgO --gt ZnO Hg
• Which is the half-reaction occurring at the
  anode?
• A) HgO 2e- --gt Hg O2-
• B) Zn2 2e- --gt Zn
• C) Zn --gt Zn2 2e-
• D) ZnO 2e- --gt Zn

6
Question 19

• Calculate the value of Eocell for the following
  reaction
• 2Au(s) 3Ca2(aq) --gt 2Au3(aq) 3Ca(s)
• A) -4.37 V
• B) -1.37 V
• C) -11.6 V
• D) 1.37 V
• E) 4.37 V

7
Question 20

• Calculate Eocell for a silver-aluminum cell in
  which the cell reaction is
• Al(s) 3Ag(aq) --gt Al3(aq) 3Ag(s)
• A) -2.46 V
• B) 0.86 V
• C) -0.86 V
• D) 2.46 V
• E) none of these

8
Answer Key Chapter 19

• C
• A
• A
• D
• A
• B
• D
• E
• D
• E

• D
• C
• E
• C
• A
• B
• B
• C
• A
• D