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35.A substance that affects the speed of a chemical reaction without itself being chemically changed is called a...Select one:a. catalyst.b. product.c. reactant.d. yield.
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35.A substance that affects the speed of a chemical reaction without itself being chemically changed is called a...Select one:a. catalyst.b. product.c. reactant.d. yield.

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A. catalyst

Step-by-step explanation

Catalyst, in chemistry, any substance that increases the rate of a reaction without itself being consumed.

User Gregory MOUSSAT
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