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I used to get confused because it's sorta counter-intuitive that something being reduced is gaining particles (electrons). It helps me to think of reduction as the charge being reduced though. Since electrons have a negative charge, they lower the charge of whatever they are added to. That thought process helps out my brain in remembering which process is reduction and which is oxidation.
Basically, you just have to look at the balanced equation to determine the oxidation number. Based on this, you can then use the LEO and OIL RIG rules to determine whether or not the element or compound has been oxidized or reduced in the reaction.
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