Given the task definition and input, reply with output. In this task, you are given a question and answer options for that question. Using this information, you have to classify each text into different topics: medicine, nursery, psychology, chemistry, pharmacology, biology.

Question: The equation of speed of a chemical reaction:
Options: <0> It must be determined from kinetic measurements and can not be deduced directly from the stoichiometry of the reaction. <1> Allows the units of s-1 (s = second) to be assigned to the velocity constant. <2> It depends on the total reaction order that, in turn, is obtained from the stoichiometric coefficients of the products. <3> Report in detail about the reaction mechanism. <4> It depends on the experimental conditions of the process.
chemistry