Rate = instantaneous velocity tangential slope of concentration versus time. Rate constant = constant from the integration of the rate law. Varies depending on reactivity of molecules and temperature. In general, rate is condition-dependent whereas rate constant is reaction-dependent. Thus, rate constants are more pertinent to mechanistic studies. In sequential reactions, there is an induction period (or lag phase) for the production of. C, during which the concentration of b increases to a maximum before decreasing. The length of time that [b[ is maximal depends on the relative rates of a b and b c (k1 and k2). When a reaction occurs over multiple steps, one of these steps limits the rate of the global reaction. Rate-determining step/rate limiting: the step in a multi-step reaction that determines the overall rate of the reaction. It is the slowest step, the one with the highest g . Follows the same rules as chemical kinetics.