Kinetics Syllabus notes from unit 4 AQA kinetics. A2 level 2.5 / 5 based on 4 ratings ? ChemistryRatesA2/A-level Created by: Kirsty JonesCreated on: 07-06-10 10:51 Rate equation Rate = k [A]x [B]Y rate = mol dm-3 s-1 = change of conc per unit time k = rate constant A, B are reactants [ ] = conc = mol dm-3 Overall order of reaction = X +Y 1 of 4 Deriving rate equation from experimental data Methods: collecting gas evolved colorimetry titration If reactant conc doubles and rate doubles = order 1 If reactant conc doubles and rate quadroubles = order 2 If rate independent to conc = order 0 2 of 4 changes of temp on K K different for every reaction varies with temp if all concentrations of all species in the rate equation are 1 mol dm-3, then the rate equation is equal to the value of k units obtained by cancelling for every 10k rise in temp reaction rate doubles allows comparisons of speeds of different reactions at a given temp larger the value of k, the faster the reaction values of k increases with temp. 3 of 4 rate determining step slowest step of reaction controls overall rate any step that occurs afterwards will not effect rate. 4 of 4
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