Define chemicals.
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As a noun, the common definition of chemical is a substance that is produced or used in a process (reaction) involving changes to atoms or molecules. The term is sometimes defined more broadly as "a substance". ... As an adjective, "chemical" means "of or pertaining to chemistry".
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Explanation:
any substance (as an acid) that is formed when two or more other substances act upon one another or that is used to produce a change in another substance.
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