100 Days of Science #44-- Oozing Pumpkins

With Halloween less than two short weeks away my boys and I just had to come up with a fun science project for us to do together and when I saw these oozing pumpkins by Steve Spangler science I just knew I had found it!!  

My boys and I had made elephant toothpaste together before but the younger two boys barely remembered it.  I still had the peroxide needed to make the toothpaste so we settled around the table and got to work. 

My boys wanted to try without carving the pumpkin at all first.  We cut a hole in the top, scooped out the guts and started mixing the ingredients together. 

First we poured 2 tablespoons of our peroxide (this concentrated hair kind; not the regular household kind!), a few drops of dish soap, and a few drops of liquid watercolors into our container and gave it a good stir.

We carefully placed it in the bottom of the pumpkin and then began mixing our yeast mixture.

I mixed 1 tablespoon of yeast with 3 tablespoons hot tap water.

I forgot to clean my fork in between and you can already see it reacting.
 We poured the yeast into the peroxide solution and then put the lid back on our pumpkin.

In no time we had an oozing pumpkin!

Once we were sure it was finished; we cleaned everything up.  Rinsed off the pumpkin and the tray and carved a face in our pumpkin.

We then mixed up a second cup of peroxide, soap and paint (this time using green and yellow) and put it in our pumpkin.

I used a larger cup this time and made sure to really mix the yeast well as I had had a lot of yeast left over in the first cup.

We added the yeast to the peroxide mixture and put the top back on.. within moments we had a foaming, frothing pumpkin! 

Such a fun reaction to see! We could feel a bit of heat coming off  it too and we talked about the fact that it's an exothermic reaction.  

Others in this series:
2.  Field Trip to the Ecotarium 
3.  Learning About Air Molecules

Linking Up With: Artsy Fartsy Link Party,


  1. Briefly browsed thru your blog and fell in love with your enthusiasm and creativity !
    I have such respect for homeschooling moms - they are so committed and organized.
    Subscribed to you - will visit you again.
    Much love from Dubai

  2. OH man- it looks beautiful and fall-like there. I should have went to that Carolina.

    1. The photos in this post were taken at home (in New England).

  3. Nice, this is a great idea to try out with the kids.
    Thank you for sharing at The Really Crafty Link Party. Pinned.

  4. What a neat project for kids to do this time of year!

    1. It was so much fun and I loved that we could just rinse it all off and start all over again.

  5. Oh my, look at those pumpkins! Thanks so much for linking up at #AThemedLinkup 2 for All Things Halloween. Shared.

    1. It was so much fun! Thanks for hosting and sharing.


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