Early Childhood Homeschooling Made Easy

Taking teaching and your child's future into your own hands.

Science Experiment – Elephant Toothpaste (Creating Foam)

on March 22, 2015

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My daughter just did this science experiment at a homeschool gathering, and I thought it was pretty neat and easy for young kids.

What you need:

  • Empty plastic water or pop/soda bottle
  • 1/2 cup hydrogen peroxide (20 volume or 6% solution)
  • Squirt of Dawn (or other brand) dish soap
  • 3-4 drops of food coloring
  • 1 teaspoon yeast
  • 2 tablespoons very warm water in a small bowl or cup
  • Funnel
  • Big bowl or foil pan
  • Safety glasses (if you feel it is necessary)
  • Play clothes, apron, or art smock (to protect your clothes from the food coloring)

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Experiment:

  1. Have kids put on their play clothes, apron, or art smock.  Put on safety glasses, if you feel it’s necessary.  We didn’t use them.  Each child should have in front of them a big bowl or cake pan, plastic bottle, dish soap in small cup, food coloring, 1/2 cup peroxide, 1 teaspoon of yeast, and 2 tablespoons of warm water.
  2. Mix yeast and warm water together in a small bowl or cup.
  3. Stand the bottle up in the center of the bowl or cake pan. Put the funnel in the opening of the water bottle. Add 3-4 drops of food coloring to the peroxide and pour the peroxide through the funnel into the bottle.
  4. Add the dish soap to the peroxide in the bottle.
  5. Pour the yeast mixture into the bottle and quickly remove the funnel.
  6. The kids can touch the bottle to feel any changes that take place.
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Kayla smelling the foam.

Observations:

After the experiment, have kids discuss what happened when they poured everything into the bottle.  How did the foam look?  When they touched the outside of the bottle, how did it feel?  Was it warm or cool?

The reaction creates foam that shoots up out of the bottle and pools in the bowl/pan. After a minute, it begins to come out in a moving stream that looks similar to toothpaste being squeezed out of a tube. The kids can play with the foam as it is just soap and water with oxygen bubbles. The bottle will feel warm to the touch as this is an exothermic reaction.

*Please note that in my family, we have a bit of an allergic reaction to hydrogen peroxide, so it is important for us to wash our hands immediately after doing this project.  If you think or know your child is sensitive to hydrogen peroxide, just be sure to have them wash their hands thoroughly after doing this experiment.

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