kinetics 2

what are rate laws?

• a rate law shows the relationship between the reaciton rate and the concentrations of reactants

• for simple reactions, rate law is usually sought in the form of rate=k[reactant 1]^m[reactant 2]^n

• the exponents tell the order of the reaction with respect to each reactant

• the overall reaction order can be found by adding the exponents on the reactants in the rate law

• for ex: rate=k[NH4+][NO2-] so with this the reactuion is first order in NH4+ and first order in No2- so second order overall

• the reaction orders may or may not be equal to the stocihiometric coefficients

• the reaction order in a reactant is most often a whole number but. can be zero fracitonal or negative

• for reacitons with complex mechanisms, the rate law may not follow th eform “rate=k{reactant 1]^m[reactant 2]^n

• the rate law has to be determined experimentally so its like CHCl3 + Cl2 —>CCl4 + HCl so rate for this one is like with a 0.5

• the units of the rate constants act. depend on the overall order of the reaction so (0=Ms-1..)

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