Scrabble?! CATALYZERS

Definitions of CATALYZERS in various dictionaries:

Catalysis is the process of altering (increasing or decreasing) the rate of a chemical reaction by adding a substance known as a catalyst (), which is not consumed in the catalyzed reaction and can continue to act repeatedly. Because of this, only very small amounts of catalyst are required to alter the reaction rate in principle.In general, chemical reactions occur faster in the presence of a catalyst because the catalyst lowers the activation energy required for the reaction to begin. In catalyzed mechanisms, the catalyst usually reacts to form a temporary intermediate, which then regenerates the original catalyst in a cyclic process. Catalysts may be classified as either homogeneous or heterogeneous. A homogeneous catalyst is one whose molecules are dispersed in the same phase (usually gaseous or liquid) as the reactant's molecules. A heterogeneous catalyst is one whose molecules are not in the same phase as the reactant's, which are typically gases or liquids that are adsorbed onto the surface of the solid catalyst. Enzymes and other biocatalysts are often considered as a third category.