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03 Notes - Spontaneous Redox

03 Notes - Spontaneous Redox - In order for a redox...

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Aim: What causes a redox reaction to occur spontaneously? QQ: Pb + NaNO 3 PbO + NaNO 2 a) Provide the half reactions b) Identify the oxidizing and reducing agent Do Now: When will reactions occur spontaneously? Spontaneous Reaction: reaction that leads to an overall decrease in energy (usually by decreasing enthalpy and increasing entropy). Reaction #1 Zn (s) + Cu 2+ (aq) Zn 2+ (aq) + Cu (s) Oxidation: Zn 0 Zn 2+ + 2e- Reduction: Cu 2+ + 2e- Cu 0 Reaction #2 Cu (s) + Zn 2+ (aq) Cu 2+ (aq) + Zn (s) Oxidation: Cu 0 Cu 2+ + 2e- Reduction: Zn 2+ + 2e- Zn 0 Why does the system with solid zinc and aqueous copper ions work while the reverse does not? Activity Series (See Reference Table J) The higher the metal, the more likely it is to be oxidized (better anode). The higher the nonmetal, the more likely it is to be reduced (better cathode).
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