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General Chemistry Science Fair Project

Explosive Elephant Toothpaste

Explosive Elephant Toothpaste | Science Fair Projects | STEM Projects
In this fun experiment, you'll make a giant tube of foam that rushes out of a bottle, just like squeezing toothpaste from a tube. The foam is filled with oxygen and created through an exothermic reaction, which means heat is created during the reaction!


The hypothesis is that by mixing hydrogen peroxide, yeast, and dish soap together, a reaction will occur that produces a lot of foam.

Method & Materials

You will mix hydrogen peroxide, dish soap, and food coloring in a bottle, then add yeast mixed with warm water to the bottle. This will cause the foam to overflow out of the bottle!
You will need a clean 16-oz plastic soda bottle, hydrogen peroxide, yeast, dishwashing soap, food coloring, warm water, gloves, safety goggles, and a tray or washable surface to do this experiment on.


This experiment showed that mixing the hydrogen peroxide, yeast and dish soap together can cause a fun and exciting reaction. The ingredients by themselves don't create large amounts of foam, but only when they're mixed together. The heat is generated because of an exothermic reaction, which is caused by the catalase enzyme in yeast breaking down the hydrogen peroxide into oxygen and water. The foam is caused by the soap trapping the oxygen gas.

Why do this project?

The Elephant Toothpaste experiment is not only visually impressive but also a great way to explore chemistry. With simple ingredients, you can witness a powerful chemical reaction that teaches you about catalysts and exothermic reactions.

Also Consider

Use different colors of food coloring to see how they mix and create new colors in the foam. Vary the amount of hydrogen peroxide and yeast to see how it affects the size and duration of the foam eruption. Use different types of soap and detergents to see if they affect the foam's texture. Use bottles with different-sized openings to create even more gigantic 'Dinosaur Toothpaste' eruptions or tiny 'Mouse Toothpaste' eruptions!

Full project details

You can find additional information and details for this science fair project here. Have fun exploring!

Related videos

Hey there! Here are some awesome videos about this science project that we think you'll really like. They're not only super fun, but they'll also help you learn more about the science behind the project. So sit back, relax, and get ready to have some fun!!
The elephant toothpaste experiment is not just for adults, even young kids can join in the fun! An adult can assist by pouring the hydrogen peroxide into the bottle, and then the kids can add the remaining ingredients! The main ingredient responsible for a more vigorous reaction and a larger amount of foam produced in this video is 6% hydrogen peroxide! While 3% hydrogen peroxide is readily available, you may be able to find 6% hydrogen peroxide from a beauty supply store.
Get ready for some exciting and explosive fun with the elephant toothpaste experiment! Using basic household items like an empty water bottle, hydrogen peroxide, soap, yeast, warm water, and some food coloring to create a colorful reaction!
Are you ready to see something super cool? Try the elephant toothpaste experiment with all colors of food coloring and watch a giant rainbow explosion of foam! This colorful science experiment is sure to amaze you!
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