Chemical Kinetics & Catalysis
60 terms · page 2 of 3
Half-Life of a Reaction
The time required for the concentration of a reactant to fall to half its initial value.
Chemical Kinetics & CatalysisHeterogeneous Catalysis
Catalysis in which the catalyst is in a different phase from the reactants, usually a solid with gaseous or liquid reagents.
Chemical Kinetics & CatalysisHomogeneous Catalysis
Catalysis in which the catalyst is in the same phase as the reactants.
Chemical Kinetics & CatalysisInhibitor
A substance that decreases the rate of a chemical reaction.
Chemical Kinetics & CatalysisInitial Rate Method
A technique for determining reaction orders by measuring the starting rate in a series of experiments with different initial concentrations.
Chemical Kinetics & CatalysisInstantaneous Rate
The rate of a reaction at one particular moment, given by the gradient of the concentration–time curve at that point.
Chemical Kinetics & CatalysisIntegrated Rate Law
The equation obtained by integrating a differential rate law, giving concentration directly as a function of time.
Chemical Kinetics & CatalysisKinetic and Thermodynamic Control
The distinction between a reaction giving the product that forms fastest and one giving the product that is most stable.
Chemical Kinetics & CatalysisLangmuir Adsorption Isotherm
A model describing monolayer adsorption on a surface with a fixed number of equivalent, independent sites.
Chemical Kinetics & CatalysisMichaelis–Menten Kinetics
The standard model of enzyme kinetics, in which rate rises with substrate concentration until the enzyme becomes saturated.
Chemical Kinetics & CatalysisMolecularity
The number of reacting species that collide simultaneously in a single elementary step.
Chemical Kinetics & CatalysisOrder of Reaction
The power to which the concentration of a given reactant is raised in the experimentally determined rate law.
Chemical Kinetics & CatalysisOverall Order
The sum of the individual orders with respect to every reactant appearing in the rate law.
Chemical Kinetics & CatalysisPhotochemical Quantum Yield
The number of molecules reacting for each photon of light absorbed by the system.
Chemical Kinetics & CatalysisPhysisorption
Weak adsorption in which molecules are held to a surface by van der Waals forces alone.
Chemical Kinetics & CatalysisPre-exponential Factor
The constant A in the Arrhenius equation, representing the frequency of appropriately oriented collisions.
Chemical Kinetics & CatalysisPromoter
A substance that has little catalytic activity itself but greatly increases the effectiveness of a catalyst.
Chemical Kinetics & CatalysisPseudo-First-Order Reaction
A higher-order reaction that behaves as first order because one reactant is present in such large excess that its concentration is…
Chemical Kinetics & CatalysisRate Constant
The proportionality constant in a rate law, characteristic of a given reaction at a given temperature.
Chemical Kinetics & CatalysisRate Law
An experimentally determined equation expressing reaction rate as a function of reactant concentrations.
Chemical Kinetics & CatalysisRate-Determining Step
The slowest step in a reaction mechanism, which limits the overall rate.
Chemical Kinetics & CatalysisReaction Intermediate
A species produced in one step of a mechanism and consumed in a later one, so it does not appear in the overall equation.
Chemical Kinetics & CatalysisReaction Mechanism
The detailed sequence of elementary steps by which reactants are converted into products.
Chemical Kinetics & CatalysisReaction Rate
The change in concentration of a reactant or product per unit time.