Pure substance
- Single element or compound
- Not mixed with any other substances
How to test for purity
- Pure substances melt and boil at fixed temperatures
- Use melting and boiling point data to distinguish pure substances from mixtures
Compounds
- two or more elements
- chemically combined
Mixtures
- two or more elements
- not chemically combined
Formulation
- a mixture
- designed as a useful product
- paint/ fuels/ alloys/ foods