Pure substances are composed of a single type of what?

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Multiple Choice

Pure substances are composed of a single type of what?

Explanation:
Pure substances have a fixed composition and are made of a single type of particle. That particle is an atom in elements or a molecule in compounds. So pure substances are composed of a single type of atom or molecule. Elements are pure substances because they consist of one kind of atom, and compounds are pure substances because they consist of identical molecules formed from two or more atoms in a fixed ratio. A mixture, by contrast, contains more than one kind of particle and is not pure.

Pure substances have a fixed composition and are made of a single type of particle. That particle is an atom in elements or a molecule in compounds. So pure substances are composed of a single type of atom or molecule. Elements are pure substances because they consist of one kind of atom, and compounds are pure substances because they consist of identical molecules formed from two or more atoms in a fixed ratio. A mixture, by contrast, contains more than one kind of particle and is not pure.

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