Chemical Kinetics and Reaction Rates constitute the quantitative study of reaction speed within the domain of physical chemistry, governed by the rate law which expresses the dependency of reaction velocity on reactant concentrations. The theoretical framework relies on the collision theory and transition state theory to formally define mechanisms, distinguishing between elementary steps and overall stoichiometric equations while utilizing activation energy and temperature as primary variables. This subfield of chemical thermodynamics and dynamics provides the formal definitions and mathematical relationships necessary to predict temporal concentration changes in closed systems.
Prerequisite chain context: requires Activation Energy in Chemical Thermodynamics.