Mezcla: está formado por dos o más sustancias puras. Las mezclas tienen composición química variable no se expresa por una fórmula única. Algunas son tan importantes que tienen nombre propio. Ejemplos:
- 1) Gasolina – una mezcla de hidrocarburos, que son sustancias formadas por hidrógeno y carbono.
- 2) El aire atmosférico – mezcla de 78% de nitrógeno, 21% de oxígeno, 1% de argón y restante de otros gases, como el dióxido de carbono.
- 3) Alcohol hidratado – mezcla de 96% de alcohol etílico y 4% de agua.
Sustancia: es cada una de las especies de materia que constituye el Universo. Puede ser simple o compuesta.
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