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Description

Science - Reaction
This experiment is sometimes called 'Elephant's Toothpaste' because it looks like toothpaste coming out of a tube but don't get the foam in your mouth!

Resources

• A clean 16 ounce plastic soda bottle
• 1/2 cup 20-volume hydrogen peroxide liquid (20-volume is a 6% solution, ask an adult to get this from a beauty supply store or hair salon)
• 1 Tablespoon (one packet) of dry yeast
• 3 Tablespoons of warm water
• Liquid dish washing soap
• Food coloring
• Small cup
• Safety goggles

NOTE: The foam will overflow from the bottle, so be sure to do this experiment on a washable surface, or place the bottle on a tray.

Instructions

What to do
1. Hydrogen peroxide can irritate skin and eyes, so put on those safety goggles and ask an adult to carefully pour the hydrogen peroxide into the

bottle.
2. Add 8 drops of your favorite food coloring into the bottle.
3. Add about 1 tablespoon of liquid dish soap into the bottle and swish the bottle around a bit to mix it.
4. In a separate small cup, combine the warm water and the yeast together and mix for about 30 seconds.
5. Now the adventure starts! Pour the yeast water mixture into the bottle (a funnel helps here) and watch the foaminess begin!

How does it work?
Foam is awesome! The foam you made is special because each tiny foam bubble is filled with oxygen. The yeast acted as a catalyst (a helper) to remove the

oxygen from the hydrogen peroxide. Since it did this very fast, it created lots and lots of bubbles. Did you notice the bottle got warm. Your experiment

created a reaction called an Exothermic Reaction – that means it not only

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• science experiments
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