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  • Writer's pictureSTEM Warriors Philippines

Elephant Toothpaste

Updated: Aug 28, 2022

What is elephant toothpaste? With this science experiment, you learn about chemical reactions and explore the awesome world of chemistry.

Hydrogen peroxide is a liquid made from hydrogen atoms and oxygen atoms. It is available in different strengths or concentrations and also breaks down when exposed to light, which is why it usually comes in dark brown bottles. Hydrogen peroxide is also a common antiseptic used to clean cuts and scrapes by killing bacteria.

When hydrogen peroxide breaks down, it normally happens very slowly. By adding a catalyst, you can make this reaction faster. Yeast is an organism that contains a special chemical called catalase that can act as a catalyst to help break down hydrogen peroxide.

This simple experiment will help you create your very own giant foamy reaction using hydrogen peroxide and yeast. We call this foam elephant toothpaste. Have fun, STEM Warriors!


1. Gloves

2. Goggles

3. Clean 350 or 500ml Water Bottle

4. 2 Tbsp Warm Water

5. 1 Tsp Yeast

6. 1 Tbsp Dish Soap

7. Food Color

8. 120ml Hydrogen Peroxide (10-20 volumes)

9. Glass Bowl

10. Funnel

11. Glass Rectangular Tray



When the yeast mixture was mixed with the hydrogen peroxide mixture, it rapidly broke down into water and oxygen gas. The oxygen gas forms bubbles and these bubbles would usually escape from the liquid and pop quickly. But adding a little dish soap provides additional surface tension, allowing the bubbles to get trapped and creating lots of foam. This foam looks like a giant squeeze of toothpaste - almost big enough for an elephant.


Learn more about crystals here:

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