Lecture15 - Reducing Agent? Oxidation Half Reaction?...

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Oxidation-Reduction, Standard Reduction Potential Read: 18.1 to 18.4 HW: P861 # 15, 17, 45, 47, 51, 53, 55
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Electrochemical Cells Voltaic (Galvanic) Cells *spontaneous oxidation-reduction reaction produces electricity Electrolytic Cells *electricity used to force a nonspontaneous oxdidation-reduction reaction
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Oxidation-Reduction (Redox) Electron exchange reactions Oxidation *loss of e-, increase in oxidation state Reduction *gain of e-, decrease in oxidation state LEO says GER
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Agents Oxidizing Agent = causes oxidation (takes e-, gets reduced) Reducing Agent = causes reduction (gives e-, gets oxidized)
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Al(s) + Ag + (aq)   Al 3+ (aq) + Ag(s) Oxidized? Reduced? Oxidizing Agent? Reducing Agent? Oxidation Half Reaction? Reduction Half Reaction? Balanced Redox Reaction?
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H + + MnO 4 - + Fe 2+ → H 2 O + Mn 2+ + Fe 3+ Oxidized? Reduced? Oxidizing Agent? Reducing Agent? Oxidation Half Reaction? Reduction Half Reaction? Balanced Redox Reaction?
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H + + Cr 2 O 7 2- + Cu H 2 O + Cr 3+ + Cu 2+ Oxidized? Reduced? Oxidizing Agent?
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Unformatted text preview: Reducing Agent? Oxidation Half Reaction? Reduction Half Reaction? Balanced Redox Reaction? Standard Reduction Potential Measures potential difference of reduction vs. standard hydrogen electrode Unit is volts (Joules / coulomb) Decreasing strength of oxidizing agents - left side Increasing strength of reducing agents - right side E redox = E red + E ox E Calculation, Interpretation 3 Ag + (aq) + Al(s) 3 Ag(s) + Al 3+ (aq) Zn(s) + 2H + (aq) Zn +2 (aq) + H 2 (g) Cu(s) + Zn 2+ (aq) Cu 2+ (aq) + Zn(s) 2K(s) + 2H 2 O(l) 2K + (aq) + H 2 (g) + 2OH-(aq) E G K Reaction +->1 Prod fav, spont -+ <1 React fav, nonspont 1 ? E Calculation, Interpretation 3 Ag + (aq) + Al(s) 3 Ag(s) + Al 3+ (aq) Zn(s) + 2H + (aq) Zn +2 (aq) + H 2 (g) Cu(s) + Zn 2+ (aq) Cu 2+ (aq) + Zn(s) 2K(s) + 2H 2 O(l) 2K + (aq) + H 2 (g) + 2OH-(aq)...
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This note was uploaded on 08/26/2011 for the course CHEM 104 taught by Professor Quigley during the Spring '08 term at CUNY Hunter.

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Lecture15 - Reducing Agent? Oxidation Half Reaction?...

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