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Published in: Education, Business, Technology


  1. 1. By Firman
  2. 2.  This reaction is in fast speed such as explosion.  Larger surface area will increase the speed of the reaction and increase the energy output.  Ex : coal dust reacts faster than coal when burning due more surface area touch with oxygen.
  3. 3.  Food start to be unpleasant if you keep it for a long time. This due to oxygen reacting with the food.  The process Is called oxidation.  Oxidation cannot take place without oxygen.
  4. 4.  In food chemical added to the food to prevent oxidation or make the oxidation process take longer time.  This chemical is called antioxidants.
  5. 5.  Rusting that happen in metal because water vapor in the air touch the metal.  The water vapor is containing oxygen.  The brown flake is called rust.
  6. 6.  If metal get rust usually they’re not strong again.  If the steel in a bridge is not strong the bridge will break down.
  7. 7.  Warmed  Salt
  8. 8.  Metal can be coated with other metal to prevent rusting.  Chromium can be coat to iron to in process called chromium plating.  Painting  Galvanising plating (Zinc Plating)  Mix metal with other. (Stainless Steel)
  9. 9.  Iron coated with zinc will protect the iron. Because the zinc is more reactive and can be peel of easily.  Silver can be say to be tarnished because of rusting. The rust can be remove by polishing.  Copper in the roof react with oxygen to form rust called vendigris.  Bronze develop patina.