Nov_26 - Chapter 14 Electrochemistry Suggested Problems Ch...

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Chapter 14 Electrochemistry Suggested Problems: Ch 14: 11, 29, 38, 39, 41, 55, 67
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Major Applications " Electrochemical Sensors " Corrosion Prevention " Fuel Cells (in development)
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Redox Reactions " Electrochemical reactions involve electron transfer from one species to another. " Oxidation: loss of electrons " Reduction: gain of electrons " The oxidized reactant is a reducing agent " The reduced reactant is an oxidizing agent
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Oxidation States • Pure elements: zero oxidation state • Simple ions: oxidation state = charge on ion E.g. 2 Na + Cl 2 2 Na + + 2 Cl - Ox #: 0 0 +1 -1 " Na is oxidized and is a reducing agent " Cl 2 is reduced and is an oxidizing agent
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Assigning Oxidation Number " Group 1A: +1 " Group 2A: +2 " H: +1 except in metal hydrides (NaH, CaH 2 ) " F: -1 " O: -2 except when bonded to itself or fluorine " Oxidation states must sum to the charge on a compound or ion
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Half Reactions Zn(s) → Zn 2+ (aq) + 2 e - (oxidation) 2 e - + Cu 2+ (aq) → Cu(s) (reduction) Zn(s) + Cu 2+ (aq) → Zn 2+ (aq) + Cu(s) (overall) The e - should always cancel out in the overall redox reaction.
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Example
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