purity & formulations

• a pure substances is a single element or compound, not mixed with any other substance
• pure elements and compounds melt and boil at a specific temperature

  so this data can be used to distinguish pure substances from mixtures
• graph shows a PURE substances as the melting and boiling points are at fixed temperatures

  
• this shows an IMPURE substance as the water melts and boils over a range of temperatures

  
• a formulation is a complex mixture that has been designed as a useful product

  each chemical has a particular purpose

  the quantity of components are carefully measured to ensure that the product has requires properties
• formulation examples:

  • fuels
  • cleaning agents
  • paints
  • medicine
  • alloys
  • fertilisers
  • foods