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Picture of Elephant Toothpaste
This instructable teaches you how to do the simple science experiment called Elephant Toothpaste.
 
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Step 1: Materials

Picture of Materials
Gather the Following Ingredients:
An empty plastic bottle
1/2 cup of hydrogen peroxide  WARNING: Keep peroxide off skin.
1 tablespoon of yeast
3 tablespoons warm water
Food coloring of your choice
Cup
Stirring stick
Funnel (optional)
Safety materials (goggles, gloves, etc.)

Step 2: Creating Elephant Toothpaste

Picture of Creating Elephant Toothpaste
1. Hydrogen peroxide can irritate skin and eyes, so put on those safety goggles and ask an adult to carefully pour the 1/2 cup of  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!

Step 3: Safety Precautions

Picture of Safety Precautions
There are various safety precautions that should be taken before beginning this experiment:

- Use safety glasses and gloves to prevent direct contact with your skin and the peroxide which can cause severe irritation.

- It is best to have an adult pour the peroxide, but it is not entirely necessary if you have "a steady hand".

- The elephant toothpaste can make a large mess, so be sure to put the beaker or bottle in a tub for easy clean-up.

- Stay mature.  Don't mess around with any supplies or the finished product.  Don't eat the foam. 

Step 4: The Science Behind It All

Picture of The Science Behind It All
2(HO): Hydrogen Peroxide
H2O: Water
C17H35COONa: Dish Soap
C27H25N2NaO7S2: Green Food Coloring
Yeast: We are unable to find a chemical formula. Yeast is living, so it doesn't have a chemical formula

The equation for this is experiment is:
H2O2(aq) + I-(aq) → OI-(aq) + H2O(l) +

We are expecting the yeast to remove all of the oxygen from the hydrogen peroxide. In theory, this will happen very fast and form bubbles and the bottle should get warm. The end product from this will be a foam and heat. The heat shouldn't be much, but a little. The foam, in theory, will go all over the place. But we will be able to clean it up with a dish rag and water.  The reaction is exothermic."