Galvanic cells: electrodes, electron flow, and ΔG
Which statement is true of a galvanic (voltaic) cell under standard conditions?
Answer C: explanation for every choice
A
Oxidation always occurs at the anode, in both galvanic and electrolytic cells.
B
Electrons always flow from anode to cathode through the external circuit.
C
Correct. Galvanic cells are spontaneous. Since ΔG° = −nFE°, a positive E°cell means negative ΔG°.
D
In a galvanic cell the anode is negative because it releases electrons. The anode is positive in an electrolytic cell, which is the trap here.
Takeaway"An ox, red cat" never changes. Only the sign of the electrodes flips between galvanic and electrolytic cells.
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Reviewed 2026-11-05 by a medical student. Spot an error? Report it with question ID cp3.