The difference in energy between the reactants and the transition state that is the energy barrier the reactants must overcome to achieve a chemical reaction.
A substance that lowers the activation energy for a chemical reaction without being chemically altered by the reaction.
A reaction that represents a single collision or intramolecular step in a reaction mechanism.
A catalyst that is in the same phase as the reactants.
A species that is both produced and consumed in a chemical reaction. As such, it does not appear in the overall reaction but is proposed to be produced in one elementary step and consumed in another.
The study of the rate and mechanism of chemical reactions.
The series of elementary steps that combine to produce the path molecules take from reactant(s) to product(s) in a chemical reaction.
In the rate law of a reaction, the power to which the concentration of a reagent is raised. Or, the sum of the powers on the concentration terms in the rate law.
The speed of a reaction measured in amount or reagent consumed or product produced per unit time.
The proportionality constant in the rate law expression. This factor is a measure of the intrinsic reactivity of the reaction but is not constant with respect to temperature.
An expression of the dependence of the rate of a reaction on the concentrations of reactants.
The slowest elementary step in a mechanism. The rate of the reaction must equal the rate of the slowest step because the reaction can go no faster than its slowest step.
A plot of free energy versus the reaction coordinate for a reaction that provides a pictorial representation of the lowest energy path from reactants to products.
The assumption that the rate of formation and consumption of a highly reactive intermediate are equal so that the change in intermediate concentration with respect to time is approximated to be zero.
The species with the highest energy between reactants and products on a reaction coordinate diagram, it is a short-lived species that represents a combination of product-like and reactant-like properties.