rates of reaction

RATE OF A CHEMICAL REACTION

The change in concentration per unit time of any one reactant or product

ACTIVATION ENERGY

minimum combined energy of particles for effective collisions

HETEROGENOUS CATALYST

when catalyst is in a different phase from reactants

HOMOGENOUS CATALYSTS

when catalyst is in the same phase as reactants

AUTOCATALYST

when a product of the reactants acts as a catalyst in the reaction

CATALYST

A substance that alters the speed of a chemical reaction but is not consumed in the reaction itself

EFFECTIVE COLLISIONS

one that results in a reactions / formation of product

CATALYSTIC POISON

substance that makes catalysts inactive

CATALYTIC CONVERTER

devicein exhaust which converts pollutants to less harmful substances

ENZYME

biological catalyst