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Unformatted text preview: Chapter 20 November 6, 2007 *ELECTROCHEMISTRY is the study of the relationship between electricity and chemical reactions. *OXIDATION-REDUCTION (or REDOX) reactions are reactions which transfer electrons between reactants. For example: *Zinc is OXIDIZED, that is, it has LOST ELECTRONS making the charge more positive. Hydrogen is REDUCED, that is, it has GAINED ELECTRONS making the charge more negative. (NOTE: Do not confuse MORE negative to mean that it will have a negative charge. A charge of 2 is more negative, or less positive, than a charge of 4.) *OXIDANT (OXIDATING AGENT) is the substance making it possible for another substance to be oxidized. It acquires electrons. *REDUCTANT (REDUCINT AGENT) is the substance that gives up electrons. *When something is oxidized, electrons appear on the products side. When something is reduced, electrons appear on the reactants side. November 8, 2007 *Like other chemical reactions, you must balance according to the law of conservation of mass...
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