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Air

Air. By Mr. Bronks. 0.03%. Composition of Air. Air breathed in. Air breathed out. 21%. 79%. Oxygen in Air. The part of air that supports combustion or burning Used up by breathing so use in hospitals Also rusting or corrosion Rockets carry their own supply of Oxygen.

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Air

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  1. Air By Mr. Bronks

  2. 0.03% Composition of Air Air breathed in Air breathed out 21% 79%

  3. Oxygen in Air • The part of air that supports combustion or burning • Used up by breathing so use in hospitals • Also rusting or corrosion • Rockets carry their own supply of Oxygen

  4. Rocket Fuel?

  5. Magnesium + oxygen Magnesium oxide Carbon + oxygen Carbon dioxide Sulphur + oxygen Sulphur dioxide The Fire Triangle Fire Burning things When something is burned it reacts with oxygen. For example: Oxygen Fuel Heat

  6. Percentage of Oxygen When we cover the candle the oxygen is used up – the water rises to fill the gap We measure the rise and find it’s around 21% Gas Jar Candle Water

  7. Air Limewater Limewater turns milky/cloudy Testing for carbon dioxide Proves Carbon Dioxide in Air

  8. Ice and Salt Drops on the test tube Testing for Water Vapour in Air Cobalt Chloride Paper turns pink in the presence of water

  9. Catalyst • A substance that speeds up a chemical reaction but is not used up in the reaction. Here platinum is used as a catalyst in this catalytic converter. CO2 CO2 CO

  10. Catalyst • A substance that speeds up a chemical reaction but is not used up in the reaction. Here platinum is used as a catalyst in this catalytic converter. CO2 CO2 CO2 CO

  11. Oxygen • Catalyst speeds up reaction but is not used up – Manganese Dioxide • Oxygen does not dissolve in the water

  12. Test for Oxygen • Relights a glowing splint Oxygen

  13. Test for Oxygen • Relights a glowing splint

  14. Burning Magnesium in Oxygen • Burns much brighter • In fact goes crazy-nuts-bright-and-scary Oxygen

  15. Burning Magnesium in Oxygen • Very Bright Flame

  16. Burning Magnesium in Oxygen • White Powder remains- Magnesium Oxide

  17. Water • Add water 2MgO +H2O2Mg(OH)

  18. Water Red Litmus turns Blue colour proves liquid is a BASE 2MgO +H2O2Mg(OH)

  19. Burning Magnesium in Oxygen • Very Bright Flame • White Powder remains- Magnesium Oxide Add water and Red Litmus paper turns Blue colour proves liquid is a BASE

  20. Rusting also needs Oxygen Just like the candle the steel rusts and oxygen is used up. The space is filled with water Steel wool Rusted Gas Jar Water 2 weeks later

  21. Preventing Rusting Metals needs water and oxygen to rust

  22. Preventing Rusting • Plating • Painting • Greasing • Dry • Galvanising

  23. Summary

  24. H/W • P233 • Q 1,2,3,4,5.

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