Lec11_drobny_11 - Lecture 11: Cell Potentials Reading:...

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Unformatted text preview: Lecture 11: Cell Potentials Reading: Zumdahl 11.2 Recommended Problems:11.15,11.17,11.19 11.21 Outline Redox Review What is a cell potential? SHE, the electrochemical zero. Using standard reduction potentials. Galvanic Cells In redox reaction, electrons are transferred from the oxidized species to the reduced species. Imagine separating the two 1/2 cells physically, then providing a conduit through which the electrons travel from one cell to the other. Porous Cap Galvanic Cells (cont.) Cu Cu 2+ + 2e- Ag + + e- Ag x 2 Cu 2+ (aq) Cu Ag + (aq) Ag e- e- Galvanic Cells (cont.) Anode: Electrons are lost Oxidation Cathode: Electrons are gained Reduction Cell Potentials In a galvanic cell, a species is oxidized at the anode, a another species is reduced at the cathode, with electrons fowing From anode to cathode. This electron current can do work: w=-qE cell where q is the charge transFerred From anode to cathode. The Force on the electrons causing them to Full is reFerred to as the electromotive Force E cell (EM)....
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Lec11_drobny_11 - Lecture 11: Cell Potentials Reading:...

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