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The rate law is an expression for the reaction rate in terms of concentrations of chemical species involved in the reaction. For example, Rate = k [A]m [B]n. where k is a rate constant, m is reaction order with respect to A, n is the reaction order with respect to B, and m+n is the overall reaction order. The rate constant is independent of the concentrations of the chemical species involved in the reaction.
4. The reaction rate law expression relates the rate of a reaction to the concentrations of the reactants.Each concentration is expressed with an order (exponent).The rate constant converts the concentration expression into thecorrect units of rate (Ms â1). The Overall Order of a reaction is the sum of the individual orders:Rate (Ms â1) = k[A][B] 1/2 [C] 2 Overall order: 1 + Â½ + 2 = 3.5 = 7/2 or seven â halves order note: when the order of a reaction is 1 (first order) no exponent is written.