17 - AP Chemistry Lab Electrochemical Cells Brockport High...

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AP Chemistry Lab Brockport High School NY USA Electrochemical Cells Mr Keefer Introduction Electrochemistry deals with the relations between chemical changes and electrical energy. It is primarily concerned with oxidation-reduction phenomena. Chemical reactions can be used to produce electrical energy in voltaic (galvanic) cells. Electrical energy, on the other hand, can be used to bring about chemical changes in an electrolytic cell. A spontaneous redox reaction can be used to produce electrical energy. In a voltaic cell, the electron transfer (current) occurs in an external circuit (wire). The cell voltage (emf) is determined by the type of electrodes. Oxidation occurs at the anode and reduction occurs at the cathode. The total cell potential, E o cell , can be predicted by analyzing the two half reactions and using a table of Standard Reduction Potentials which is based on the standard hydrogen electrode where the cell potential is zero. From the voltage readings, the spontaneity
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17 - AP Chemistry Lab Electrochemical Cells Brockport High...

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