A. Oxidation and reduction half-reactions occur at electrodes in electrochemical cells.
B. All electrochemical reactions involve the transfer of electrons.
C. Reduction occurs at the cathode.
D. All voltaic (galvanic) cells involve the use of electricity to initiate nonspontaneous chemical reactions.
As the cell given below operates, the strip of silver gains mass (only silver) and the concentration of silver ions in the solution around the silver strip decreases, while the strip of lead loses mass and the concentration of lead increases in the solution around the lead strip. Which of the following represents the reaction that occurs at the negative electrode in the above cell?
Pb / Pb (NO3)2 (1.0 M) || AgNO3 (1.0 M) / Ag
A. Pb2+ + 2 e- Pb
B. Pb Pb2+ + 2 e-
C. Ag+ + e- Ag
D. Ag Ag+ + e