10. 
    Catalyst
    The speeding up of a chemical reaction by lowering the activation energy, often through addition of a substance that accelerates the reaction but is not used up in the reaction.
    Found op http://www.encyclo.co.uk/visitor-contributions.php
    
    
11. 
    catalyst
    [Noun] Something that causes change.
    Example: The new manager had been a real catalyst in turning the company around.
    Found op http://www.bbc.co.uk/skillswise/glossary/
    
    
12. 
    catalyst
    [n] - (chemistry) a substance that initiates or accelerates a chemical reaction without itself being affected 2. [n] - something that causes an important event to happen
    Found op http://www.webdictionary.co.uk/definition.php?query=catalyst
    
    
13. 
    Catalyst
    A catalyst speeds up a chemical process, but usually does not itself get used up or changed chemically. Vitamin B6 is a catalyst for various body metabolism processes.
    Found op http://www.bcpa.co.uk/glossary.htm
    
    
14. 
    Catalyst
    a substance which increases the rate of a chemical reaction without being consumed in the reaction
    Found op http://www.oasisenviro.co.uk/Glossary%20C%20to%20E.htm
    
    
15. 
    Catalyst
    Substance that speeds up a chemical process without actually changing the products of reaction. It lowers the activation energies of both, the forward and the reverse reaction. A catalyst provides a different pathway for a reaction. It may appear in a rate law. A catalyst does not change thermodynam...
    Found op http://www.diracdelta.co.uk/science/source/c/a/catalyst/source.html
    
    
16. 
    catalyst
    A substance that participates in a particular chemical reaction and thereby increases its rate but without a net change in the amount of that substance in the system. At the molecular level, the catalyst is used and regenerated during each set of microscopic chemical events leading from a molecular ...
    Found op http://www.chem.qmul.ac.uk/iupac/gtpoc/CaCl.html
    
    
17. 
    Catalyst
    a substance which without itself undergoing any permanent chemical change, facilitates or enables a reaction between other substances.
    Found op http://www.bio-power.co.uk/glossary.htm
    
    
18. 
    Catalyst
    A substance that speeds up a chemical reaction without being consumed itself in the reaction.A substance that alters (usually increases) the rate at which a reaction occurs.
    Found op http://www.allchemicals.info/index/action/detail/keyword/C/id/1059729102.ph
    
    
19. 
    Catalyst
    A substance that changes the rate at which a reaction equilibrium is attained, without itself being consumed. Catalysts can increase the rate of reaction (positive catalysts) or decrease them (negative catalysts or inhibitors).
    Found op http://www.encyclo.co.uk/visitor-contributions.php
    
    
20. 
    catalyst
    catalyze; catalysis. A substance that increases the rate of a chemical reaction, without being consumed or produced by the reaction. Catalysts speed both the forward and reverse reactions, without changing the position of equilibrium. Enzymes are catalysts for many biochemical reactions.
    Found op http://antoine.frostburg.edu/chem/senese/101/glossary/c.shtml
    
    
21. 
    catalyst
    Catalyst is a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change. Catalyst that have the same phase as the reactants are homogenous catalysts (e.g. enzymes in biochemical reactions). Those that have a different phase are heterogeneous cat...
    Found op http://www.ktf-split.hr/periodni/en/abc/c.html
    
    
22. 
    Catalyst
    a substance that alters the velocity of a chemical reaction and may be recovered essentially unaltered in form and amount at the end of the reaction.
    Found op http://www.chemicalglossary.net/definition/281-Catalyst
    
    

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