What Is a Chemical? Definition and Examples - Science Notes …
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WEBOct 15, 2023 · A chemical is a substance with a specific composition. It is an element, an alloy, or a compound made up of two or more elements combined in a fixed ratio. For instance, water (H 2 O) is a chemical because it consists of hydrogen and oxygen combined in a 2:1 ratio. All matter either is a chemical or else consists of chemicals.
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