Lecture 7 Redox Reactions and Electrochemical Cells

Lecture 7 Redox Reactions and Electrochemical Cells -...

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Electrochemistry: Chemical Change and Electrical Work Tremendous variety of applications Batteries Corrosion–rust Electroplating Extraction e.g., aluminum, copper from oxides Any transformation from ions to neutral molecules, or vice versa Electroactive catalysts Electrical conductivity Measurements of electroactive bioanalytes
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Redox Reactions CHM139 F2011 Jockusch Electrochemistry L7 2 Oxidation of zinc by O 2
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Redox Reactions 3 Redox reactions involve the movement of electrons from one reagent to another. O xidation i s l oss of electrons R eduction i s the g ain of electrons Zn Zn 2+ + 2 e ½ O 2 O 2 2 e + Oil Rig “half reactions” –an imaginary construct rxn: See section 4.5 for a review of basic redox concepts Zn + ½ O 2 ZnO The loss and gain of electrons are linked and actually occur simultaneously in solution.
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More Terminology Redox reactions involve the movement of electrons from one reagent to another. rxn: Zn + ½ O 2 ZnO Zn is oxidized. Zn is the reducing agent. O 2 is reduced. O 2 is the oxidizing agent. Zn Zn 2+ + 2 e ½ O 2 O 2 2 e + Oxidation half reaction: Reduction half reaction:
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Redox Reactions CHM139 F2011 Jockusch Electrochemistry L7 5 oxidation of zinc by H 3 O + or Cu 2+
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• Write down the two half-reactions , each of which contains the oxidized and reduced forms of one of the species. • Balance the atoms and charges
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This note was uploaded on 12/15/2011 for the course CHM 139 taught by Professor Browning during the Spring '08 term at University of Toronto- Toronto.

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Lecture 7 Redox Reactions and Electrochemical Cells -...

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