Lecture 20

Lecture 20 - Chem 338 Lecture 20 Rate Laws for Chemical...

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Chem 338 C h em 3 3 8 L e c t u r e 2 0 Rate Laws for Chemical Reactions 1. Differential rate laws: order, x = α + β 2. Integrated rate laws. a) First-order: b) Second-order: 3. Experimental rate laws. 4. Reversible Reactions 5. Relaxation methods. [] 1 () rate dP kT AB pd t aA bB pP α β = + 11 rate kt to rate RR e = = = =+
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Chem 338 1. Differential rate laws 11 1 1 : , : AB C D C DAB CD A B The rate of a chemical reaction A B C D can be expressed as the rate of change of the extent of reaction dn dn dn dn d Rate dt dt dt dt dt orasthera teof changeof theconc ν νν ξ + →+ == = = = [] 1 1 : . A B entratons of the reactants and products dC dD dA dB Rate dt dt dt dt which is the general practice Note that the rate expression varies with the specific choice of stoichiometric coefficients = = .
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Chem 338
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Chem 338 Differential rate laws: order, x = α + β [] 1 () . rate aA bB pP dP kT AB pd t note that a and b may or may not equal and αβ α β +→ =
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Chem 338
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Lecture 20 - Chem 338 Lecture 20 Rate Laws for Chemical...

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