MASC Final Page 6,7

MASC Final Page 6,7 - Half-Reactions Zn(s) + Cu2+(aq)...

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Half-Reactions Zn(s) + Cu2+(aq) à Zn2+(aq) + Cu(s) Zn(s) à Zn2+(aq) + 2e- anodic or oxidation half-reaction Cu2+(aq) + 2e- à Cu(s) cathodic or reduction half-reaction The oxidation number is the number of electrons that the metal atom has loss. The oxidation number is indicated by roman numerals in parenthesis after the Iron(IV) oxide is FeO2 Iron(II) oxide is FeO Shorthand representation of an electrochemical cell Zn(s) | ZnSO4(aq) || CuSO4(aq) | Cu(s) or Zn(s) | Zn2+ || Cu2+ | Cu(s) The left side is the anode where oxidation takes place. The right side is the cathode where the reduction takes place. Standard Reduction Potentials A positive reduction potential means that reduction is favored A negative reduction potential means that oxidation is favored The overall reaction is spontaneous if the cell potential is positive Relation Between Gibbs Free Energy and Cell Potential G must be negative for the reaction to proceed spontaneously. G = -nFEcell F = 96,485 coulombs per mole What is the cell potential for concentrations that are not at standard state? - Nernst Equation Ecell = Ecello – (RT/nF) ln(Q) Ecello = (RT/nF) ln(K) Forward Reaction N2(g) + O2(g)
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This note was uploaded on 02/28/2008 for the course MASC 110L taught by Professor Goo during the Spring '07 term at USC.

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MASC Final Page 6,7 - Half-Reactions Zn(s) + Cu2+(aq)...

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