Foam!

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What You Need:

  • elephant_toothpasteClear plastic bottles (1 or 2 L)
  • Goggles
  • Dish soap
  • Food coloring
  • H2O2 (30% is strongest)
  • Funnels
  • Yeast
  • Small cups
  • Spoons

What Do You Do?

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

What Happened?

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 created foam, it created heat! The foam produced is just water, soap, and oxygen so you can clean it up with a sponge and pour any extra liquid left in the bottle down the drain.

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!

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