Lecture14 2-11-08 Electrochem

Lecture14 2-11-08 Electrochem - ELECTROCHEMISTRY Two Types...

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G < 0 Spontaneous Chemical Reaction Generates Voltage/current G > 0 Voltage/current source drives chemical reaction in non-spontaneous direction Voltaic Cells Electrolysys Cells ELECTROCHEMISTRY Two Types of Devices Rechargeable Batteries
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Electrochemistry, Redox Reactions Voltaic cells are also called Galvanic cells. They use a spontaneous oxidation/reduction reaction to produce current G < 0 Copper plates on magnesium and magnesium dissolves as Mg 2+
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Ag + Plates onto Copper and Copper dissolves as Cu 2+ Colorless solution of Ag+ and NO 3 - Blue solution of Cu 2+ and NO 3 - 2 Ag + + Cu Cu 2+ + 2 Ag G < 0
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A redox reaction Cu 2+ (aq) + Zn (s) Æ Zn 2+ (aq) + Cu (s) G rxn 0 The half reactions Cu 2+ (aq) + 2e - Æ Cu (s) Zn (s) Æ Zn 2+ (aq) + 2e - Zinc dissolves and copper is precipitated from solution if the reactants are brought into direct contact with each other. E = q It is possible to separate the two half reactions, linking them by a wire and a salt bridge or porous plate. They do not come into
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This note was uploaded on 08/06/2008 for the course CHEM 1B taught by Professor Watts during the Winter '08 term at UCSB.

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Lecture14 2-11-08 Electrochem - ELECTROCHEMISTRY Two Types...

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