Simultaneous and sequential transformations

A new formal kinetics methodology suitable for the situation in which transformations take place simultaneously or sequentially is presented. Based on the distinction between theoretical and experimental quantities, and with the help of the superposition principle, general relationships were obtained to deal with simultaneous and sequential reactions. The equations presented here are able to deal with position-dependent quantities and there is no need to rely on extended volume. They are suitable both for model building, i.e. obtaining expressions for simultaneous or sequential reactions from models of the kinetics of each reaction in isolation, as well as for extracting theoretical information from experimentally measured quantities.