Elephant's Toothpaste

Foam is awesome! 

The foam we 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. The bottle got very warm. The experiment created a reaction called an Exothermic reaction - that means it not only created foam, it creates heat! The foam produced is just water, soap and oxygen so we could just clean it up and pour it down the drain. This experiment is sometimes called “Elephant’s Toothpaste” because it looks like toothpaste coming out of a tube.