|It almost looks like toothpaste for an elephant, doesn't it?|
Here's what you'll need:
- 1/2 cup 6% hydrogen peroxide (sold in beauty supply stores or online as 20 Volume Clear Developer )
- 2 tsp. yeast (1 packet)
- 3 tbsp. warm water
- dish detergent
- food coloring (optional)
- empty 16oz plastic bottle
- safety goggles
- tray or container to catch the foaming fun
Here's what to do:
- Pour 1/2 cup of the peroxide into the empty water bottle (Hydrogen peroxide can irritate skin and eyes, so make sure you protect your eyes and skin and let a grown up do the pouring.)
- Add about 8 drops of food coloring to the bottle (optional)
- Add about 1 tbsp. of liquid dish soap into the bottle and swish it just a bit to mix it.
- In a separate cup, combine yeast and warm water. Mix for about 30 seconds until most lumps are gone.
- Now the fun begins!! Pour the yeast mixture into the bottle ( using a funnel) and watch the foaminess begin.
- The foam is just water, soap and oxygen so it's safe to touch, but it will be warm because of the reaction!
And here it is on video so you can see the fun foaming fountain in action!!
Here's the science behind this experiment (from ScienceBob.com)
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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