35 - Electrochemical cell: Galvanic Cell spontaneous A cell...

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A cell which involves the transfer of electrons between matter Electrochemical cell: Electrochemical cell: anode cathode e - chemical energy electrical energy Section 11.6 Galvanic Cell spontaneous chemical energy electrical energy Electrolytic Cell non-spontaneous anode cathode e - 2H 2 O 2H 2 +O 2 Wanted Redox Redox chemistry chemistry Batteries and Re-chargable Batteries and Electrolytic Cells corrosion Unwanted Section 11.6 Clever! The cell maintains electrolytic balance. No salt bridge needed! Wanted Redox Redox chemistry chemistry Alkaline Battery: AA, AAA, C, D Zn(s) + 2OH 1- (aq) Zn(OH) 2 (s) + 2e - 2MnO 2 (s) + H 2 O(l) + 2e - 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 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 G o < 0 (exo) S o ~ 0 Button Battery: 1.6V Zn(s) + 2OH 1- (aq) Zn(OH) 2 (s) + 2e - Ag 2 O (s) + H 2 O(l) + 2e - 2Ag (s) + 2OH 1- (aq) +2 -2 1 - 2 + 1 Oxidized to Anode +1 -2 -2 +1 -2 1 Reduced to Cathode Section 11.6: Galvanic 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
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This note was uploaded on 06/08/2008 for the course CH 101 taught by Professor Bigham during the Fall '08 term at N.C. State.

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35 - Electrochemical cell: Galvanic Cell spontaneous A cell...

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