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Electrochemical Cells
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An incredibly crucial class of oxidation and reduction reactions are used to provide batteries with useful electrical energy. A basic electrochemical cell can be constructed from copper and zinc metals with solutions of their sulfates. During the reaction, electrons can be transferred from the zinc to the copper through an electrically conducting trail as a useful electric current.

An electrochemical cell can be constructed by placing metallic electrodes into an electrolyte where a chemical reaction must either use or generate an electrical current. Electrochemical cells which are designed to produce an electrical current are known as Voltaic cells or Galvanic cells, and most batteries fall into one of these two categories. In other electrochemical cells an extremely supplied current is used to drive a chemical reaction which would not occur naturally or spontaneously. Cells like this are known as Electrolytic cells.

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Oxidation always occurs at the Anode, Reduction always occurs at the Cathode.

http://hyperphysics.phy-astr.gsu.edu/hbase/chemical/electrochem.html