For cases where [A] exactly doubles: - if the rate does not change, the order for A is 0 . - if the rate doubles, then the order for A is 1. - if the rate quadruples, the order for A is 2. For more complex cases, use the general equation: rate2rate1=([reactant]2[reactant]1)order What is the reaction order with respect to A ? Rate =k[A]orderA[B]orderB