Pure substance
- Single elements and compounds
- Not mixed with any other substances
How to test for purity
- Pure substances melt and boil at fixed temperatures
- However, mixtures melt and boil over a range of temperatures.
Compounds
- two or more elements
- chemically combined
Mixtures
- two or more elements
- not chemically combined
Formulation
- a mixture
- designed for a useful purpose
- paint/ alloys