11-14 - Electrochemical cell: Galvanic Cell spontaneous A...

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A cell which involves the transfer of  electrons between matter Electrochemical cell: Electrochemical cell: anode cathode chemical energy electrical energy Section 11.6 Galvanic Cell spontaneous chemical energy electrical energy Electrolytic Cell non-spontaneous anode cathode 2H 2 O 2H +O 2
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Wanted Redox chemistry Redox chemistry Batteries and Re-chargable Batteries and  Electrolytic Cells corrosion   Unwanted Section 11.6
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Clever!  The cell maintains electrolytic balance.               No salt bridge needed! Wanted Redox chemistry Redox chemistry Alkaline Battery:  AA, AAA, C, D Zn(s) + 2OH 1- (aq)  Zn(OH) 2 (s) + 2 e 2MnO 2  (s) + H 2 O (l)   + 2 e - Mn 2 O 3  (s) + 2OH 1- (aq)  +4 -2 -2 +1 -2 -2 +3 +1 +2 -2 0 +1 -2 +1 Oxidized to Anode Reduced to Cathode Section 11.6:  Galvanic
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2MnO 2  (s) + Zn(s) + H 2 O (l)   Mn 2 O 3  (s) + Zn(OH) 2 (s) http://courses.ncsu.edu/ch101/common/cams/html/c11_electro/s06_apps_01.html Section 11.6:  Galvanic Inert electrode: Used to move e-s but does not change oxidation state R P E Rxn Coordinate
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Button Battery: 1.6V Zn(s) + 2OH 1- (aq)  Zn(OH) 2 (s) + 2 e Ag 2 O (s) + H 2 O (l)   + 2 e - 2Ag (s) + 2OH 1- (aq)  +2 -2 0 +1 -2 +1 Oxidized to Anode +1 -2 -2 +1 -2 0 +1 Reduced to Cathode Section 11.6: Galvanic
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Ag 2 O (s) + Zn(s) + H 2 O (l)   2Ag (s) + Zn(OH) 2 (s) http://courses.ncsu.edu/ch101/common/cams/html/c11_electro/s06_apps_02.html Section 11.6: Galvanic
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0 Oxidized to Anode +2 +6 -2 +6 -2 Car Battery: 2V * 6 = 12 V Pb(s) + SO 4 2- (aq)  PbSO 4 (s) + 2 e PbO
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This note was uploaded on 03/20/2008 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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11-14 - Electrochemical cell: Galvanic Cell spontaneous A...

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