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17. What are the two classes of pure substances?

A. Elements and compounds
B. Solutions and mixtures
C. Liquids and gases
D. Atoms and molecules



Answer :

GinnyAnswer

Final answer:

Elements and compounds are the two classes of pure substances.


Explanation:

Elements and compounds are the two classes of pure substances. Elements are substances that cannot be broken down into simpler substances by chemical changes, such as iron, gold, and oxygen. Compounds, on the other hand, are substances made up of more than one type of atom, like water (H2O) which is composed of hydrogen and oxygen.


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