CH16b_over - CHAPTER 16 - Kinetics for elementary reaction:...

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CHAPTER 16 - Kinetics for elementary reaction : B+C products kinetic theory interpretation: to react molecules need 1. to collide 2. to be properly oriented 3. to have a minimum kinetic energy , E a r = (total # of collisions) × (fraction oriented) × (fraction with E a ) = [B][C](size)(speed)(fraction oriented) e E a / RT = Ae E a / RT [B][C] = k [B][C] Arrhenius equation : k = Ae E a / RT 1. plot ln k vs 1/ T to determine parameters a) A = pre-exponential factor b) E a = activation energy 2. temperature dependence (van’t Hoff-like) ln k 1 k 2 =− E a R 1 T 1 1 T 2
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-2- CHAPTER 16 - Kinetics Reaction Mechanism (theory based on collisions) 1. describes (postulates) how reaction occurs 2. consists of a sequence of elementary steps a) steps sum to overall stoichiometry
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CH16b_over - CHAPTER 16 - Kinetics for elementary reaction:...

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