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One type of substance
Definite Composition
Cannot be separated by physical processes
Pure Substances
-
Cannot be separated into simpler substances by chemical means
- Elements
- Ex: Copper, Aluminum
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Can be separated into simpler substances by chemical means
- Compounds
- Ex: Salt (NaCl), Water (H20)
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Two or more types of substances
Variable composition
Can be separated by physical processes
Mixtures
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Uniform composition
- Homogeneous
- Ex: Salt Water (NaCl, H20)
- Brass (Cu, Zn)
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Nonuniform composition
- Heterogeneous
- Ex: Pizza, Water and Sand
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