All terms in this list:
atom: The smallest mediaeval unit of time, equal to fifteen ninety-fourths of a second.
element: a part or aspect of something
compound: a thing that is composed of two or more separate elements
mixture: a substance made by mixing other substances together
pure substance: material with a specific chemical composition
heterogeneous: Diverse in kind or nature; composed of diverse parts.
homogeneous: similar, or the same as something else
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