Purity and Formulations.

• Formulations: A mixture that has been designed to make a useful product
• Pure Substance: A single atom or a compound of single elements. That have a fixed boiling and melting point.
• An impure Substance/Mixture: is a mixture of two or more substances with a range of boiling and melting points.
• Sweetners and food colouring are added to medicines to make it easier to swallow.