combined GCSE chemistry


the properties of gases in the earths atmosphere:

  • 78% nitrogen
  • 21% oxygen
  • small quantities of other gases this includes, noble gases, carbon dioxide and water vapour

importance of atmospheric gases:

the earths atmosphere contains nurmerous gases, each of which has an effect o the success of our planets organisms


  • oxygen is a reactant in respiration- a chemical reaction that takes place in all living cells
  • as humans, we breathe oxygen into our lungs. from there, it diffuses into our blood and is carried to all the cells in our body

carbon dioxide and water vapour:

  • carbon dioxide and water vapour are greenhouse gases
  • greenhouse…


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