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Describe each of the following compounds with as many of these words as apply: atom, molecule, pure substance, homogeneous mixture, heterogeneous mixture, element, solution.

-Table salt (sodium chloride or NaCl)
-Blue Cheese salad dressing
-Iron (Fe)

Table salt — pure substance

Blue cheese salad dressing — heterogeneous mixture

Iron (Fe) — pure substance, element, atom  

Explanation:

Table salt is a compound. It is not a mixture.

Blue cheese dressing usually consists of blue cheese, mayonnaise, sour cream, and other substances. You can see the different phases.

Fe can refer to an atom. Iron cannot be broken down into simpler substances.

the volume increases