CHMA11H3 Chapter Notes - Chapter 18: Electrochemistry, Nernst Equation, Electroplating

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12 Jun 2016
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Oxidation process that occurs when: oxidation number of an element increases, an element loses electrons, a cmpd adds oxygen, a cmpd loses hydrogen, a half-rxn has e- as products. Reduction process that occurs when: oxidation number of element decreases, an element gains electrons, a cmpd loses oxygen, a cmpd gains hydrogen, a half-rxn has e- as reactants. Agent (in general) facilitates a process. Oxidizing reagents promotes/facilitates oxidation process: undergoes reduction to facilitate oxidation. Reducing reagents promotes/facilitates reduction process: undergoes oxidation to facilitate reduction. Redox rxns involve the transfer of e- (current) from one substance to another. Therefore, redox rxns have the potential to generate an electric current. To use that current, we need to separate the place when oxy is occurring from the place where redu is occurring: if not separated, no efficient flow of e- Not making use of the potential e: separation prevents mixing of 2 sol"ns (cid:0) allows efficient flow of e-

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