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Electrons are always flowing from the anode to the cathode. You can tell which substances are at the anode by determining which substance is losing electrons. The opposite goes for the cathode. In a cell diagram (written), the substances on the left of the double lines are the ones at the anode.
The anode is where there is a loss of electrons and the compound is oxidized. The cathode is where there is a gain of electrons and the compound is reduced. You can tell which is more likely by looking at the Eo values. the more negative one is a stronger reducing agent and is therefore more likely oxidized.
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