The Mini scientists were at it again!

The Experiment, sometimes called elephant toothpaste, is a simple experiment to look at "exothermic reactions" in normal peoples terms - it created heat!

So what did we need:

1 clean 16 oz soda bottle

1/2 cup of hydrogen peroxide liquid (20-volume is 6% solution, sold in chemists)

1 Tablespoon of dry yeast

3 Tablespoons of warm water

1 tablespoon of dishwashing liquid

8 drops of food colouring

​Safety goggles!

How did we do it?

The foam overflows, so make sure that you do the final bit over the sink!

1. Ask an Adult to put the Hydrogen peroxide into a soda bottle as it can irritate skin and eyes. 

2. Add the food colouring into the bottle. (about 8 drops)

3. Add about 1 tablespoon of dishwashing liquid to the bottle and swirl it around.

4. In a small bowl mix up the yeast with 3 tablespoons of warm water.

5, Move your big soda bottle to the sink and add the yeast.  stand back and watch the foam.

How does it work?

Foam is awesome! the foam is very special because each 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 and this is called a exothermic reaction. This means that you not only created foam, but you created heat as well. 

The foam is produced from just water, soap and oxygen. You can play with it and then just wash it down the drain.

This experiment is sometimes called "elephant toothpaste" because it looks like toothpaste coming out of a tube, but don't get this foam in your mouth!