BIOCH499A Study Guide - Jmol, Alka-Seltzer, Pre-Exponential Factor
5 Mar 2014
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The last few lectures we dealt with kinetics, straight lines and slopes . The rate constant is given by k = p z f. 2 p = steric factor only a proper orientation is allowed. Z = # of collision per unit time per unit volume. Plot reaction profile or activation energy diagram f = fraction of molecules with energy ea. The larger ea, the smaller k and hence a slower rxn. Ea = rt k = p z e rt/rt = pz e 1 = 0. 37 pz. Bonds in the reactants stretch and become weaker. New intermolecular bonds start to form (still weak at this stage). The transition species is known as the transition state or the activated complex. The transition state (ts) or activated complex has these characteristics. Exact structure is unknown (can"t be isolated) In equilibrium (low concentration) with reactants and products. When the potential energy reaches a maximum, we call it the transition state.
