Question

2A.. Which of the following transformations could take place at the cathode of an electrochemical (voltaic) cell? A) MnO2 ? MnO4- B) Br2 ? BrO3- C) NO ? HNO2 D) H2SO4 ? H2SO3 E) Mn 2+ ? MnO4- Al electrode on left Cu electrode on right 1.0 M Al(NO3)3 1.0M Cu(NO3)2 2Al(s) + 3Cu2+(aq) ? 2Al3+(aq) + 3Cu(s) 2B. When switch, S, is closed, electrons in the external circuit will flow from A) Al to Al 3+ B) Al to Cu C) Cu to Al D) Cu to Cu 2+ E) Al 3+ to Cu2+ 2C. When switch, S, is closed, which of the following will occur? I. cations will migrate toward the aluminum half-cell II. anions will migrate toward the copper half-cell III. anions will migrate toward the aluminum half-cell A) I only B) II only C) I and II only D) III only E) Not enough information provided.

          2A.. Which of the following transformations could take place at the cathode of an electrochemical (voltaic) cell?

A) MnO2 ? MnO4- B) Br2 ? BrO3- C) NO ? HNO2 D) H2SO4 ? H2SO3

E) Mn 2+ ? MnO4-

Al electrode on left Cu electrode on right

1.0 M Al(NO3)3 1.0M Cu(NO3)2

2Al(s) + 3Cu2+(aq) ? 2Al3+(aq) + 3Cu(s)

2B. When switch, S, is closed, electrons in the external circuit will flow from

A) Al to Al 3+ B) Al to Cu C) Cu to Al D) Cu to Cu 2+ E) Al 3+ to Cu2+

2C. When switch, S, is closed, which of the following will occur?

I. cations will migrate toward the aluminum half-cell

II. anions will migrate toward the copper half-cell

III. anions will migrate toward the aluminum half-cell

A) I only B) II only C) I and II only D) III only E) Not enough information provided.

2A.. Which of the following transformations could take place at the cathode of an electrochemical (voltaic) cell?

A) MnO2 ? MnO4- B) Br2 ? BrO3- C) NO ? HNO2 D) H2SO4 ? H2SO3

E) Mn 2+ ? MnO4-

Al electrode on left Cu electrode on right

1.0 M Al(NO3)3 1.0M Cu(NO3)2

2Al(s) + 3Cu2+(aq) ? 2Al3+(aq) + 3Cu(s)

2B. When switch, S, is closed, electrons in the external circuit will flow from

A) Al to Al 3+ B) Al to Cu C) Cu to Al D) Cu to Cu 2+ E) Al 3+ to Cu2+

2C. When switch, S, is closed, which of the following will occur?

I. cations will migrate toward the aluminum half-cell

II. anions will migrate toward the copper half-cell

III. anions will migrate toward the aluminum half-cell

A) I only B) II only C) I and II only D) III only E) Not enough information provided.

Added by Richard L.

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