Alka-Seltzer Rocket

A plastic film canister filled with water and alka-seltzer creates carbon dioxide gas, building pressure until the lid pops off and launches the canister like a rocket.

1. Put on safety glasses.
2. Fill a plastic film canister about one-third full with water.
3. Break an alka-seltzer tablet in half.
4. Drop half a tablet into the canister and quickly snap the lid closed.
5. Flip the canister upside down and place it on its lid in a tray.
6. Step back and watch as the gas pressure builds until the rocket launches.

Make a rocket with water and Alka-Seltzer | STEM activity - Exploration Place:

Alka Seltzer Film Canister Rockets - Cub Scout Ideas:

📄 Easy Film Canister Rocket - Science Fun for Everyone: https://www.sciencefun.org/kidszone/experiments/easy-film-canister-rocket/

• Use different amounts of alka-seltzer to compare launch times and heights.
• Try other liquids such as vinegar, soda, or juice instead of water.
• Test hot water versus cold water to see how temperature affects the reaction.

• Always wear safety glasses.
• Stand back after sealing the canister to avoid being hit.
• Conduct the experiment in a clear, open area or use a tray to contain spills.

• What gas is produced when alka-seltzer reacts with water? (carbon dioxide)
• Why does pressure build up inside the canister? (gas is trapped and pushes on the walls until the lid pops off)
• How does water temperature affect the reaction speed? (hot water speeds up the reaction, cold water slows it down)
• What variables could you change to make the rocket go higher? (amount of alka-seltzer, type of liquid, temperature, or canister size)