Answered

What is a catalyst defined as?

Aa substance that speeds up a reaction only
Ba substance that speeds up a reaction, and is not used up
Ca substance that speeds up a reaction, and is completely used up
Da substance that slows down a reaction, and is completely used up

Verified Answer :

babyguitarpick

I have just done this in chemistry and i think the answer is B. A substance thst speeds up a reaction, and is not used up. Hope this helps:)

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