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A substance by itself will not slow down a chemical reaction; factors require change, such as cooling the reactants or lowering the concentration, to do so. Adding another chemical or substance that happens to slow a reaction often does so by actually interfering with the reaction and replacing or preventing it outright, and there is not a name for chemicals that do this -?inhibitor?-, since a chemical may do this to one reaction, but be a catalyst to another.

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decrease surface area/ remove catalyst/ decrease temperature/ decrease concentration/ add inhibitor/ dilute reactants/ separate reactants/

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What is the name of substance that slows reaction?

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