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I believe Dr. Lavelle will generally put the anode on the left and the cathode on the right. However, if you are unsure, look at the standard reduction potentials chart and determine which one is being reduced and which one is being oxidized from those values. Always try to make the voltage positive.
Generally, the anode is on the left and the cathode is on the right. If this is not the case, however, you can identify which electrode is the anode and which is the cathode by looking at the half reactions. The oxidation half reaction takes place at the anode (electrons are lost), the reduction half reaction takes place at the cathode (electrons are gained).
Usually the anode is on the left and the cathode is on the right, and we see the electrons flow from left to right. If this isn't the case, though, just remember that oxidation (loss of elections) occurs at the anode and reduction (gain of electrons) occurs at the cathode.
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