A substance that speeds up a chemical reaction
A catalyst will appear in... [DOC] [TLE] General Chemistry Online: Glossary: Reaction rates - Antoine [PAR] A substance that increases the rate of a chemical reaction, without being ... or 
protein-based molecules that speed up chemical reactions occurring in living... [DOC] [TLE] The effect of catalysts on rates of reaction - Chemguide [PAR] THE EFFECT OF CATALYSTS ON REACTION RATES ... A catalyst is a 
substance which speeds up a reaction, but is chemically unchanged at the end of 
the reaction.