======Alka-Seltzer Rocket======


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**Materials: **{{$demo.materials_description}}\\
**Difficulty: **{{$demo.difficulty_description}}\\
**Safety: **{{$demo.safety_description}}\\
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**Categories:** {{$demo.categories}}
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**Alternative titles:** Film Canister Rocket
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====Summary====                   
{{$demo.summary}}



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



====Links==== 
Make a rocket with water and Alka-Seltzer | STEM activity - Exploration Place: 
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Alka Seltzer Film Canister Rockets - Cub Scout Ideas: 
{{youtube>m5lkJsuJ4ag?}}\\

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

====Variations====
  * 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.



====Safety Precautions====
  * 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.




====Questions to Consider====
  * 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)