CHEM 134 Lecture 15: Electrochemistry OILRIG
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8 Feb 2018
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The transfer of electrons provides a means for converting chemical energy to electrical energy, or vice versa. The study of the relationship between electricity and chemical reactions is called electrochemistry. In redox reactions, electrons are transferred from one species (the reductant) to another (the oxidant). The two parts of the reaction are physically separated. The oxidation reaction occurs at the anode. The reduction reaction occurs at the cathode. Reduction - any process in which the oxidation number of an atom decreases (becomes more negative). Oxidation - any process in which the oxidation number of an atom increases (becomes more positive). Corrosion - a type of redox reaction in which a metal is destroyed. O2(g) 2 fe2o3 3 h2o metathesis reaction - a reaction in which atoms are interchanged and there is no change in oxidation number. Disproportionation reaction - a reaction in which a single reactant undergoes both oxidation and reduction. Oxidizing agent - causes oxidation; undergoes reduction (gains electrons).
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