17_kinetics_rates (2)

17_kinetics_rates(2)

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Unformatted text preview: H2O(l) k-1 Calculate reaction half life with k1=1.4x1011 dm3 mol-1 s-1, if [H+]0=[OH-]0=1.0x10-7 mol dm-3, i.e. pure water 1 / 1 1 1.4 10 1.0 10 7.1 10 71 s 18 11/20/2013 at equlibrium Reversible Reactions 0 if both reactions are 1st order examine case 0, , 0 therefore separate variables integrate ′ 19 11/20/2013 ′ ln ln ) lim → Some algebra or rewriting 1 From previous page 20 11/20/2013 ln a plot of ln vs time has a slope of at equilibrium equilibrium constant measure and a plot of ln vs time has a slope of two constraints for two unknowns (Kc and sum k1+k-1), enough to determine k1 and k-1 21 11/20/2013 Relaxation Methods: Temperature Jump , , ∆ ∆ , and , ∆ integrating , or ∆ where ∆ ∆ ∆ 0 ∆ ∆ with condition gives ∆ ∆ , ∆ , , Stoichiometry is 1:1, so ∆ , ∆ 0 , ∆ 1 / is the relaxation time 22 11/20/2013 Relaxation Time Time to get to 1/e of the change Consider a series of reactions having the following energy profiles: Rank the reactions from slowest to fastest assuming that they have nearly the same frequency factors. The lower the activation energy, the faster the reaction. The value of E does not affect the rate. Hence the order is (2) < (3) < (1). 23 11/20/2013 Activation Energy Temperature and Rate glow sticks – chemiluminescence react...
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This document was uploaded on 01/19/2014.

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