Intro to electrochem - For chem1A 2011, Hsiung-Lin...

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For chem1A 2011, Hsiung-Lin Introduction to electrochemistry There are various chemical reactions. Previously, we talked a lot about acid/base reactions. They usually involve the proton (H + ) transfer processes. We are now going to consider another type of reaction, which involves the transfer of electrons. When electrons are transferred from one compound to another, the reactions are called oxidation-reduction reactions (of Redox reactions). You understand that when a element accepts or donates electrons, that its ‘oxidation number’ must change. Oxidation : oxidation number increases, ex: A b A 1+ + e - ; B b B 2+ + 2e - C + b C 3+ + 2e - Reduction : oxidation number decreases, ex: D + + e - b D E 3+ + 2e - b E + To reduce an oxidation number electrons are ADDED (they are negatively charged, so this reduces the oxidation number) to a compound. Conversely, if electrons are removed from a compound, that compound experiences an oxidation (and its oxidation number increases). OIL and RIG -- All these redox reactions have corresponding E 0 (electric potential or voltage) values, just like you have K (equilibrium constant) for a specific reaction. Actually,
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This note was uploaded on 08/01/2011 for the course PSYCH 201 taught by Professor Vig during the Spring '09 term at American Academy of Art.

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Intro to electrochem - For chem1A 2011, Hsiung-Lin...

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