Science Week lesson plan: Bubble bangs (KS2)

Science Week lesson plan: Bubble bang

Outdoors, demonstrate the ‘blasting' chemical reaction between bicarbonate of soda and vinegar.


  • Zip-lock sandwich bags (use good quality bags)
  • Vinegar
  • Bicarbonate of soda
  • Squares of tissue
  • Spoon
  • Cup


  1. Lay a square of tissue on a surface.
  2. Put two spoonfuls of bicarbonate of soda in the centre of the tissue.
  3. Fold the edges of the tissue and twist the top gently to create a little parcel.
  4. Fill the cup with vinegar and pour into the zip-lock bag.
  5. Drop the parcel of bicarbonate of soda into the zip-lock bag and quickly seal the bag.
  6. Put it on the floor then stand well back.
  7. Observe what happens and get ready for a ‘bang!’


Vinegar (acetic acid) and bicarbonate of soda (sodium bicarbonate) react to produce bubbles of carbon dioxide gas. When the reaction is sealed inside a zip-lock bag it fills with the gas until it explodes.


  • What would happen if you changed the amounts of vinegar or bicarbonate of soda?
  • Would it work with different liquids such as water or milk?
  • Does the material used to make the parcel make a difference to the reaction?

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Published by

Dr Fran

Dr Fran Barnes is Cornerstones' expert in primary science. Fran is a molecular and cell biologist with a passion for hands-on, practical science in the classroom. She writes our Love to Investigate series and the science topics in our curriculum.

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