Anode and Cathode by Reaction, Not by Charge
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State
The anode is always where oxidation occurs and the cathode always where reduction occurs, in every electrochemical cell, regardless of which electrode carries which charge.
Show
In a galvanic cell, the anode is the negative terminal; identify it from "where electrons release," not its sign.
Watch for
Memorizing "anode is negative" as fixed breaks at an electrolytic cell.