Chemical Analysis

• What is a pure substance?

  A pure substance is a single element or compound, not mixed with any other substance.
• What is a formulation and how is it made? Give Examples.

  A formulation is a mixture which has been designed as a useful product. Formulations are all around us, for example:

  • fuels
  • cleaning products
  • paints
  • medicines
  • alloys
  • fertilisers
  • foods
• Describe tests for hydrogen, oxygen, carbon dioxide and chlorine

  Hydrogen - squeaky pop with burning splint over gas

  Oxygen - glowing splint relights

  Carbon Dioxide - turns limewater to have a milky appearance

  Chlorine - Bleaches damp litmus paper to white