purity

• What is a pure substance?

  A single element or compound
• How do pure substances behave when heated?

  They melt and boil at specific temperatures
• How can melting and boiling points be used?

  To distinguish pure substances from mixtures
• What does 'pure substance' mean in everyday language?

  A substance that has had nothing added to it
• What is a formulation?

  A mixture designed as a useful product
• Why are formulations complex mixtures?

  Each chemical has a particular purpose
• How are formulations created?

  By mixing components in measured quantities
• what are examples of formulations

  fuels, cleaning agents, paints, medicines, alloys, fertilisers and foods