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Lecture 3 - Chemical Kinetics

Lecture 3 - Chemical Kinetics - Rate Depends on Collision...

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A + B Product E a Rate = (# of collisions per second) X (fraction collisions having E > E a ) exp(-E a /RT) Rate Depends on Collision Frequency (Z 11 ) and Boltzmann Factor (e -Ea/RT ) P Rate = { Z 11 (10 8 M s -1 ) } X { exp(-0/RT) } = 10 8 M/s 2 2 11 2 2 = V N c d Z π If every collision produces product, then Rate = 10 8 M/s (upper limit). Fastest reaction rate in solution is ~10 10 M/s for H + + OH - H 2 O
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