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A battery has two electrodes labeled anode
and cathode. Electrons flow from the (anode,
cathode) to the (anode, cathode) through the
external circuit and (an oxidation, a reduc-
tion) reaction occurs at the cathode.
1. anode; cathode; reduction
2. cathode; anode; oxidation
3. anode; cathode; oxidation
4. cathode; anode; reduction

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    Electrons flow from the negative electrode to the positive electrode. By definition, oxidation is the loss of electrons and reduction is the gain of electrons. Also, by definition, the anode is where oxidation occurs.

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