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I follow the acronym OIL RIG which means oxidation is the loss (of electrons), reduction is the gain (of electrons). So whichever molecule/atom in the reaction is losing electrons (becoming more positive) is being oxidized and whichever molecule/atom is gaining electrons (becoming more negative) is being reduced.
Another tip is to figure out the oxidation numbers of each molecules first and then figure out which one loses/gains electrons with OIL RIG acronym. Oxidation numbers are basically the charges of an atom, ex) H is always 1+ Oxygen is usually 2- etc, the oxidation number of an ion is its charge... etc.
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