Kinetics Which of the following is true? In a reaction mechanism an intermediate is identical to an activated complex. Since intermediate compounds can be formed the chemical equations for the elementary reaches in a multistep mechanism do not always have to add to give the chemical equation of the overall process. If we know that a reaction is an elementary reaction, then we know its rate law. The rate-determining step of a reaction is the rate of the fastest elementary step of its mechanism All of the above