Chem_215_Lect_23_Color - Electrochemical Cells: Galvanic...

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1 Electrochemical Cells: Galvanic (Voltaic) Cell: A “battery” an electrochemical cell that operates spontaneously to produce a current I, and voltage V Cell potential E o is positive Electrolytic Cell : an electrochemical cell in which an applied external potential (voltage) forces a reaction to occur in the reverse of its spontaneous direction.
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2 Cell Voltage (Cell Potential), E o cell : voltage difference between electrodes driving force for moving electrons from anode to cathode. also known as electromotive force (emf) measured using voltmeter or potentiometer
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3 Cu (s) Cu 2+ + 2e - 2Ag + (aq) + 2e - 2Ag (s) Cu (s) + 2Ag + Cu 2+ (aq) + 2Ag (s) Cu(s) in AgNO 3 (aq) Cu(s) in Zn(NO 3 ) 2 (aq) No Reaction Why?
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4 Standard Reduction Potential= E o for a reduction reaction at electrode at 25 o C. all solutes are 1.0 M, all gases at 1.0 atm. define the reduction potential of the standard hydrogen electrode (SHE) to be zero: 2H + (aq,1.0M) + 2e
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This note was uploaded on 03/05/2009 for the course CHEM 2150 taught by Professor Chirik,p during the Fall '08 term at Cornell University (Engineering School).

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Chem_215_Lect_23_Color - Electrochemical Cells: Galvanic...

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