Achiever's Dream Reaction Kinetics Notes

The Chemistry Specialist Reaction Kinetics

The order of reaction is usually determined experimentally. It is not related to the coefficient of the stoichiometric equation UNLESS: a a a a 0 0 1/2 t1/2 1/4 1/8 t1/2 t1/2 t Rate [Reactant] [Reactant] zero order first order second order second orderfirst order zero order © Achievers Dream Reaction Kinetics s⁻¹ Order of Reaction Zero Mechanism, Catalysts, Expt Methods First Second A Products A Products A Products Rate Law/ Equation Unit of k Half life, t½ Rate = k [A]⁰ Rate = k [A]¹ is a constant Rate = k [A]² Or Rate = k [A][B] for A + B → products mol dm⁻3 s⁻1 mol⁻1 dm3 s⁻1 t½ In 2 k= • It is an elementary reaction (i.e. reactants react in a single-step reaction) or • It is the slow step in a multi-step reaction (rate-determining step) •