Fun science experiment

By: Annika and Lisette

Products you need

  • A clean 2 liter bottle
  • 1/2 a cup 20 volume hydrogen peroxide
  • 1 tablespoon of dry yeast
  • 3 tablespoons of warm water
  • liquid dish washing soap
  • food coloring
  • small cup
  • safety goggles

Note: the foam will overflow so do this experiment on a washable surface or tray.


  • hydrogen peroxide can irritate skin and the eyes, so be sure to wear goggles. also carefully pour the hydrogen peroxide into the 2 litter bottle
  • add 8 drops of food coloring into the bottle
  • add about 1 tablespoon of liquid dish soap into the bottle and mix it around for a bit
  • in a seperate cup mix the warm water and the yeast together and mix for about 30 secs.
  • now the awesome part starts pour the yeast into the 2 litter bottle (a funnel helps) and watch the foaminess begin

How this works.

FOAM IS AWESOME! The foam you made is special because each tiny bubble is filled with oxygen. The yeast acted as 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 easily.

make it an experiment

The product the above is a demonstration! to make it a true experiment, you can try to answer these questions.

  • Does the amount of yeast change the amount of foam produced?
  • Does this experiment work as well if you add the dry yeast with out mixing it with water?
  • Does the size of the bottle effect the amount of foam produced?