Alka seltzer rockets

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Alka seltzer rockets
Age Range all ages
Group Size medium (6-20)
Setting indoors, outdoors
Setup Time short (0-5 min)
Duration short (5-10 min)
Subjects chemistry
Materials alka seltzer tablets, film caninsters, water
Presentation Style demonstration

Brief Description

Pour water into canisters, add a half a tablet of seltzer to water, add lid quickly and watch the tops pop! Students will see how powerful air pressure can be.

This Is How You Play

  1. pour water into canisters
  2. add a half a tablet of seltzer to water
  3. add lid quickly, stand back and watch the tops pop!


You may turn the film canister completely over so that the lid is on the bottom. This might result in a bigger pop. If you can't get the lid on fast enough after dropping the alka seltzer tablet in, you might try this tip: lay one piece of toilet paper over the top of the open film canister, gently place the tablet on top of the toilet paper making sure it doesn't drop into the water. Seal with the lid. Now, the tablet is dry upon the toilet paper, but once the canister is turned over, the reaction will start.


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