Lecture_7.ppt - Electrochemistry A major branch of...

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Electrochemistry A major branch of analytical chemistry uses electrical measurements for analytical purposes. Electrochemistry is based on oxidation/reduction reactions.
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Oxidation/reduction (Redox) Reactions A redox reaction involves transfer of electrons from one species to another. A species is said to be oxidized when it loses electrons. It is reduced when it gains electrons. Oxidant and reductant.
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Electrochemical Cells Redox reactions can be carried out in two ways: Direct electron transfer between ions or molecules in solution. Electron transfer through an external conductor (wire). This allows the oxidation and reduction reactions to occur in different locations - Electrochemical Cells . Types of Electrochemical Cells: Galvanic Cells Electrolytic Cells
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Galvanic Cells A galvanic cell uses a spontaneous chemical reaction to generate electricity. The oxidizing and reducing reagent are physically separated, and electrons flow through an external circuit to go from reductant to oxidant.
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