Exploding Pop Rockets

This 4th of July twist on those classic Alka-Seltzer rockets is a must-try science experiment your kids will beg to repeat over and over again. The easy kids’ science project is perfect for the 4th of July, New Year’s Eve or just because!

Follow the simple step-by-step below and then grab 30 more easy-to-follow science experiments kids will beg to repeat (plus a no prep science journal to keep track of their results!) in our shop or on Teachers Pay Teachers!

This kids’ science experiment uses antacids which can contain aspirin so make sure to inform your kids that it is a medicine and should not normally be played with. Also make sure to clean up any remaining bits of antacid tablets – especially if you have toddlers in your home.

Getting Ready

To prep, I gathered together a few supplies:

  • Mini M& M tubes
  • Antacid tablets
  • Cardboard {cereal boxes work great}
  • Foil
  • Glue gun {not pictured}
  • Decorations {stickers, washi tape, painters tape}
  • Bottle of water
  • Small ball of clay {optional}


To build the rockets, I first emptied and peeled the label off the M&M tubes.  Next, I cut the tab that holds the cap on the tube so the cap could be completely removed.  Then I used an empty cereal box and my hot glue gun to make mini cones to top off the rockets


I called A over and handed her the stickers and tape so she could decorate her rockets.  While she was busy happily peeling stickers, I covered the cones with aluminum foil to finish off the tops and to provide them with a little more protection. When A was done, I hot glued the cones to the bottom {the side opposite the cap} of the M&M tubes and we were ready to make the rockets fly.

Such a fun kids' science experiment!! Pop rockets. {Playdough to Plato}

Exploding Pop Rockets

We gathered our rockets, the antacid tablets, and a bottle of water and headed outside.  This activity can get pretty messy, especially if you are like us and launch your rocket dozens of times.  I placed the small ball of clay in the lid to hold the antacid tablet in place so that A could close the lid without starting the fizz until the rocket was flipped right side up.

Such a fun, low prep kids' science experiment!! {Playdough to Plato}

Next, I poured about a teaspoon of water into the rocket and handed the rocket and lid to a nervous A.  She placed the lid snugly on the rocket, flipped the rocket onto the wooden board I had placed on the grass, and ran for cover.


The first reactions happened quickly giving A only a few seconds to run away before it popped and shot up about 3 feet in the air.

Pop Rockets. Awesome science experiment for kids!!.jpg

As the tablet disintegrated, it took longer for the pressure to build, giving her more time to hop away. Initially, my daughter was nervous about exploding rockets until she realized how harmless it really was.  Now, she can’t wait to show her grandparents and cousins how to make popping rockets when we visit them for July 4th.

The Science Behind It

When water and antacid mix, carbon dioxide gas is produced. By placing the lid on the rocket, you are trapping those gas bubbles inside. As more and more bubbles are produced, the pressure inside the rocket builds, creating enough force to break the seal on the lid.  There is so much force from the built up pressure that it launches the rocket into the air.

30 More Kids’ Science Experiments

Inspire kids to love science with our bundle of 30 easy-to-follow science experiments (plus a no prep science journal to keep track of their results!) from our shop or on Teachers Pay Teachers!

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  1. Marcy

    Do you have a “printer friendly” version so I can print the instructions cleanly?
    Thank you!

    • Ashley

      Hi Marcy,
      Unfortunately, we don’t have a printer friendly version for this activity.
      I hope you’re still able to use it.
      Ashley // Happiness Ambassador



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Hi, I’m Malia.

I LOVE helping Pre-K, Kindergarten and First Grade teachers save time, stay inspired and give EVERY student bigger results. I’m so glad you’re here!