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chem 101 chapter 1

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Tro, Principles of Chemistry: A Molecular Approach<br />

18<br />

Classification of Pure<br />

Substances⎯⎯Compounds<br />

• Substances that can be decomposed are<br />

called compounds.<br />

ü <strong>chem</strong>ical combinations of elements<br />

ü composed of molecules that contain two or<br />

more different kinds of atoms<br />

ü All molecules of a compound are identical, so all<br />

samples of a compound behave the same way.<br />

• Most natural pure substances are<br />

compounds.

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