If your kids are interested in chemical reactions and love carving pumpkins during fall, we have a great experiment to use to teach them more about STEM! Our hands-on experiments are a great way to celebrate the arrival of fall. Find your perfect pumpkin, and let’s get started!  

You will need: 

  • Medium to large pumpkin 
  • Vinegar  
  • Food Coloring  
  • Dish soap  
  • Baking soda
  • Tarp 


  1. Carve a face into your pumpkin.
  2. Set up a tarp outside and place your carved pumpkin atop the tarp.
  3. Fill the pumpkin to the point below the carved area with vinegar.
  4. Add a few drops of dish soap and food coloring.
  5. Measure out a teaspoon of baking soda.
  6. Pour in the baking soda!   

You will then see immense foam erupt inside the pumpkin and out through its mouth and eyes!   

The Science Behind the Experiment 

The pumpkin erupts because vinegar is an acid and baking soda is a base. These substances neutralize one another. Together, they create carbon dioxide, which causes the mixture to bubble. This reaction is known as an Isotropic reaction.  

The word isotropic has Greek origins and means “having the same properties in all directions.” This type of reaction is labeled as isotropic because there is no friction when these two substances produce carbon dioxide.   

Are your kids interested in learning about other chemical reactions? If so, check out our blog, 4 School Worthy Science Experiments for other fun experiments to try. You can learn more about our products here. 

My First Lab has been a leader in developing STEM equipment for the past 30 years. With products ranging from microscopes and bundles to prepared slides and accessories, we are sure to have any product that a junior investigator, hobbyist, or educational leader could need. Learn how to create hands-on experiments by browsing our blog or checking out our award-winning products.