Final answer:
A compound is a substance formed by the combination of two or more elements in a fixed ratio. Water, with a chemical formula of H₂O, is an example of a compound composed of hydrogen and oxygen.
Explanation:
A compound is a substance formed by the combination of two or more elements in a fixed ratio. Water is a compound composed of hydrogen and oxygen, with a chemical formula of H₂O. This compound always maintains a 2:1 ratio of hydrogen to oxygen atoms.
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