Properties of Matter

Alka-Seltzer Rocket

Enrichment Activity for 5-11 11-14

What you need

  • An Alka-Seltzer tablet
  • An empty film canister
  • Old newspaper
  • Water


  1. Put the tablet in the film canister. Add about 1cm of water
  2. Put the lid on, lightly shake the canister
  3. Quickly place it upside down on the newspaper and stand back!

Results and Explanation

The Alka-Seltzer fizzes when in water, releasing gas. This gas builds up in the canister until the pressure is too great and the lid is forced off!

IOP DOMAINS Physics CPD programme

Electricity CPD videos

Our new set of videos gives teachers and coaches of physics a preview of the training we offer ahead of this term's live support sessions.

Find out more