Chemistry / Chem 0039 · Atom · ~20 seconds

Compound

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A compound is a pure substance of two or more elements combined in a fixed ratio, separable only by chemical change.

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Heating mercury(II) oxide breaks it into mercury and oxygen, revealing it was never a blend of loose ingredients.

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A compound's properties differ completely from its elements — water is a stable liquid built from a flammable gas and one supporting combustion.