A chemical is a certain molecule. It is made it elements stuck together in a certain way. Elements are the building blocks. If these same elements are separated, rearranged, added to, etc we would call it a different molecule or chemical.
Enzymes are very complex molecules which can change other molecules.
What isn’t a chemical? A mix of chemicals may have a name, such as naphtha or cake 🍰, but because there is a variety of chemicals at play we wouldn’t talk about it as a chemical
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