Answer: When a substance is pure, it is composed of one type of molecule. For example, table salt is only composed of (more or less) salt molecules, while seawater has water and salt molecules. A more complicated example of a non - pure substance is soil. It has many different types of nutrients and compounds.
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wait i am kinda counfuesd
Explanation:
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the answer is B. the energy required to go from a solid to liquid
