CHM1046 LECTURE NOTES 13 3 The Rate Law of a Reaction Rate Law shows the dependence of the rate of a reaction on the concentrations of different reactants aA cC dD Rate Law Rate k A m k rate constant and m the order of the reaction with respect to A Reaction order for multiple reactions aA bB cC dD Rate k A m B n m the order of the reaction with respect to A n the order of the reaction with respect to B Overall order of reaction m n do example 13 2 in book for practice The integrated Rate Law dependence of contration on time Zero order A t kt A o 1st order ln A t kt ln A o 2nd order 1 A t kt 1 A o On a graph the second order reaction is the only one that will have an increasing line Both zero and first order reactions will show a decreasing line The half life of a reaction The time required for concentration of reactant to fall of its initial value 1st order1 2 t 0 693 k always use this for a first order reaction half life 2nd order1 2 t 1 k A o zero order1 2t A o 2k
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