Lecture5 - Activation Energy, Catalysts, Mechanisms...

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Activation Energy, Catalysts, Mechanisms Reading: 12.5 to 12.7 HW: Page 580 # 13, 19, 53, 55, 57, 59, 62, 69
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Activation Energy, E a Energy needed for reactants to collide successfully; reach transition state
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Energy Profile, Endothermic
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Energy Profile, Exothermic
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Arrhenius Equation *determining activation energy Form 1: k = Ae -Ea/RT Form 2: ln k = (-Ea/R)(1/T) + ln A k = rate constant A = frequency factor Ea = activation energy R = 8.31 J/mol K T = Kelvin temp
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Determining Activation Energy * plot ln k vs. 1/T ( Arrhenius plot) *slope = -Ea / R
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Catalysts Substances that increases reaction rate without changing overall reaction Changes mechanism, new pathway Lowers activation energy
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Catalytic Converter
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Elementary Reactions Reactions that take place in a single step Rate law may be deduced from stoichiometry (only if reaction is known to be elementary)
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Elementary Reaction – Unimolecular A B, Rate = k[A] Elementary Reactions – Bimolecular
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Lecture5 - Activation Energy, Catalysts, Mechanisms...

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