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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.
of a reaction is simply the sum of the exponents on the concentration terms for a rate law: Rate = k[A]x[B]y reaction order = x + y. Example 1: Rate = k [A]1[B]0 = k [A] is 1st order in [A] and 0th order in [B] and 1st order for the reaction. Example 2: Rate = k [A]3[B]0.5. is 3rd order in [A], half order in [B] and 3.5 order overall. What does the reaction order tell us: We need to know the order of a reaction because it tells us the. functional relationship between concentration and rate. It determines how the amount of a compound. speeds up or retards a reaction.