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August 30, 2015

Homework Help: Chemistry

Posted by Lauren on Monday, January 14, 2008 at 4:53am.

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Define a catalyst and explain a catalyst's role in a chemical reaction.

A catalyst is a substance that speeds a chemical reaction without being permanently changed itself. It works by providing a convenient surface for the reaction to occur. The reacting particles gather on the catalyst surface and collide more frequently with each other and more of the collisions result in a reaction between particles because the catalyst can lower the activation energy for the reaction.

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