Difference between compound and mixture the chemical properties of a compound are different from the chemical properties of a mixture because: a. the substances in a compound are chemically joined in a fixed proportion b. the substances in a compound are always composed of at least three different types of atoms c. mixtures are always homogeneous d. the properties of a mixture are different from those of the substances from which it is made

A mixture is formed of two substances (molecules, elements, compounds, etc.) that are not chemically bonded. A compound is formed of two substances chemically joined together, so the answer is A.

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