CHEM357 Chapter Notes - Chapter 9: Microscopic Reversibility, 2-Step Garage, Acetaldehyde
30 May 2017
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Chapter 9: chemical kinetics: experiments: measure rates of reactions as a function of various variables e. g. concentration, temperature, ph etc, interpretation: of kinetic data in molecular terms i. e. deduce mechanism (how reaction occurs) Experimentally determined rate laws have the general form: v = -d[a]/dt = k [a]m [b]n [p]q [q]r [x]s [y]t. Hemoglobin 3o2 + o2 hb 4o2 sucrose + h2o fructose + glucose. Note: rate laws cannot be deduced from the overall equation for a reaction, but they can be used to help deduce mechanism. E. g. enzyme catalyzed reactions with excess substrate. E. g. radioactive decay of 14c, degradation of penicillin. Knowing a, ao and k, can determine t=age of tree. Note: carefully inspect data to ensure truly 1st order. The data should deviate randomly from the fitted line in a linear graph. Can"t separate 3 variable (a, b, t ) so reduce to one concentration variable (i. e. replace a and b by x)
