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Selected notes from CHEM 189 L39 (04-26-10)

Selected notes from CHEM 189 L39 (04-26-10) - Effect of...

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Unformatted text preview: Effect of Temperature on Reaction Rate 1 > van't Hoff rule: raising T by 10 “6 increases the reaction rate [rate constant) by a factor of 2 - 4 9 Activation energyr (En): excess energy . [compared to its average value) that a molecule must have at the moment of collision to undergo a chemical rxn e_§ ._ ‘4 c: > T in T results in ’l‘ of “active" molecules fit of molecules 3 a > Maxwell-Boltzmann distribution mo ”90 my 2539 am YEW Ener-gyJa’mol Arrhenius Equation (late 1880's) 3 n“ = # of “active“ molecules N: total # of molecules H J. : B‘Eg/RT N Rate constant k = A e ' W” A - frequency factor (T—independent) in(k) = in“) - EJRT > Consider a plot of ln{k} vs. 1/ T (Arrhenius pilot) > A straight line with slope = -Eu/R and intercept = ln(A) 3} Reactions occurring with a measurable rate at room T have E“ = 60 -105 kJ/mol Maxwell -Boltzmann Probability Distribution2 N: total # of molecules at: # of molecules of certain energy E ’7: .6" _€ If 7? Reaction Rate Dependence on T 4 1 -typical relationship 2 — catalytic reactions Catalyst and/or transition complex decomposes at T > Tm .4 ...
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