SUPPLIES:

• An empty plastic bottle
• Liquid dish soap
• 3% hydrogen peroxide
• Measuring cups
• Measuring spoons
• Safety glasses
• A big tub or tray to catch the foam
• Liquid food coloring
• Dry yeast
• Warm water

DIRECTIONS:

1) Put on your safety glasses. Hydrogen peroxide is an irritant. 

2) Place your plastic bottle into the container you're using to catch the mess.

3) Measure 1/2 cup of hydrogen peroxide and carefully pour into the bottle.

4) Add a few drops of food coloring to the hydrogen peroxide and gently swirl to combine.

5) In a measuring cup, mix together one tablespoon of yeast and three tablespoons of warm water. Stir for about 30 seconds.

6) Pour the yeast mixture into the bottle and then quickly step back! What happens? How long does the reaction last?

ADDITIONAL FUN: 
- Try without the dish soap, what happens?
- Try with different shaped bottles. How does the shape impact the experiment?

What causes the reaction? When they hydrogen peroxide combines with the yeast it starts to break down into water and oxygen. Oxygen being a gas, wants to escape the liquid. The dish soap traps the gas bubbles creating the foam.

SAFETY NOTES:
- This is messy. If you can do it outdoors, or in an easily cleaned up area, do so.
- Although labeled as toothpaste, IT IS NOT. DO NOT TRY TO USE IT OR EAT IT!

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