A pure substance is:___.
a. composed of two or more different types of atoms or molecules combined in variable proportions.
b. composed of two or more regions with different compositions.
c. composed of only one type of atom or molecule.
d. composed of two or more different types of atoms or molecules that has constant composition.
e. none of the above.
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A pure substance is:___.
a. composed of two or more different types of atoms or molecules combined...
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