Elephant Toothpaste: An introduction to chemical reactions
- A clean 16-ounce plastic soda bottle
- 1/2 3% hydrogen peroxide liquid
- 1 Tablespoon (one packet) of dry yeast
- 3 Tablespoons of warm water
- Liquid dish washing soap
- Food coloring (optional)
- Small cup
- Safety goggles (hydrogen peroxide can irritate the skin and eyes).
Be sure to conduct your experiment on a washable surface or a tray because the toothpaste will quickly overflow.
- Pour the hydrogen peroxide into the bottle.
3. Add about 1 tablespoon of liquid dish soap and swish the bottle around to mix the solution.
4. In a separate small cup, combine the warm water and the yeast together and mix for about 30 seconds.
5. Pour the yeast water mixture into the bottle (a funnel helps here) and watch out for foam!
How does it work?
The yeast acts as a catalyst (a chemical that speeds up the process ) to quickly decompose the hydrogen peroxide into water, oxygen (bubbles) and heat (the bottle will feel warm). Because the reaction created heat, it is called an Exothermic Reaction.
**This is called Elephant Toothpaste because it produces a large amount of foam that resembles foamy toothpaste.
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