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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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    That looks good to me.

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    expected outcome of the lab experiment density alcohol and water???

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