Ready-made science week

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By Ian CrawfordYear 2 teacher and subject leader for ICT

Inspire your class during National Science and Engineering Week with these fun experiments linked to the theme of ‘Change’!

Ready-made science week - drip


Chemical change

Main activity

  • Show the class a shiny new copper coin and an older dull and dirty-looking copper coin.
  • Place the dull coin in a beaker of pure lemon juice for about five minutes.
  • Remove the coin. What has changed?
  • The coin is dull because oxygen in the air slowly changes the shiny copper surface to a dull copper oxide. The lemon juice contains a weak acid which reacts with the copper oxide and removes it, changing the surface to shiny copper again.


  • Put 50g of bicarbonate of soda in a small bottle and place the bottle in a large plastic tray. Surround the open bottle with sand in the shape of a volcano.
  • Mix together 50ml of vinegar and 50ml of tomato ketchup.
  • Pour the mixture into the bottle and wait for the ingredients to react like a volcano eruption. *The vinegar is an acid which chemically reacts with the sodium bicarbonate to produce carbon dioxide gas. The gas forces the red-coloured mixture out of the bottle, producing a volcanic effect.
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