dvb040808a4 - Principles of Chemistry II Vanden Bout Today...

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Unformatted text preview: Principles of Chemistry II Vanden Bout Today Review Transition State Theory Arrhenius Theory Kinetic Mechanisms Why does a reaciton follow a particular rate law? What is actually happening in the reaction? Principles of Chemistry II Vanden Bout Arrhenius Law The rate constant k is a function of temperature k = A e-Ea/RT Arrhenius Law pre-factor barrier temperature The higher the temperature the more molecules that have enough energy to make it over the barrier Principles of Chemistry II Vanden Bout Let's make a new Equation k = A e-Ea/RT lnk = lnA -E a /RT let's look at two temperatures lnk 1 = ln A -E a /RT 1 lnk 2 = lnA -E a /RT 2 Principles of Chemistry II Vanden Bout Let's make a new Equation k = A e-Ea/RT lnk = lnA -E a /RT let's look at two temperatures lnk 1 = ln A -E a /RT 1 lnk 2 = lnA -E a /RT 2 subtract to get a new equation that doesn't have A ln(k 2 /k 1 ) = -E a R [ ] 1 T 2 T 1 1- Principles of Chemistry II Vanden Bout A.-1.2 x 10 4 K B. 1 x 10 5 J mol-1 C. 1.2 x 10 4 J mol-1 D. 1 x 10 5 K E.-1 x 10 2 kJ mol-1 The activation energy for this reaction is? Slope = -E a /R E a = -R x slope E a = -8.314 J K-1 mol-1 x (-1.2 x 10 4 K) = 1 x 10 5 J mol-1 Principles of Chemistry II Vanden Bout Principles of Chemistry II Vanden Bout Principles of Chemistry II Vanden Bout Why are reactions faster at...
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This note was uploaded on 05/01/2008 for the course CH 302 taught by Professor Holcombe during the Spring '07 term at University of Texas at Austin.

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dvb040808a4 - Principles of Chemistry II Vanden Bout Today...

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