Because it did this very fast, it created lots and lots of bubbles. It quickly broke apart the oxygen from the hydrogen peroxide. The yeast acted as a catalyst a catalyst is used to speed up a reaction. (If you use the 3% hydrogen peroxide found in most pharmacies, then the foam can be touched safely.) How does it work?įoam is awesome! The foam you made in this classic Elephant’s Toothpaste reaction is extra-special because each tiny foam bubble is filled with oxygen. For that reason, it is recommended you do not touch the foam.
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There can, however, be un-reacted peroxide which could irritate skin and eyes. The reaction typically breaks down the hydrogen peroxide so you are left with mostly just soapy water and yeast. Now the adventure starts! Use the funnel to pour the yeast-water mixture into the bottle and watch the foaminess begin!.It should be about the consistency of melted ice cream – add a bit more warm water if needed. In a separate small cup, combine the warm water and the yeast together and mix for about 30 seconds.Add about 1 tablespoon (15ml) of liquid dish soap into the bottle and swish the bottle around a bit to mix it.Add about 10 drops of your favorite food coloring into the bottle.Use a funnel to carefully pour 3/4 cup (180 ml) of the hydrogen peroxide liquid into the bottle.Read the safety information on the hydrogen peroxide bottle and be sure to wear safety goggles. NOTE: The foam could overflow from the bottle, so be sure to do this experiment on a washable surface, or place the bottle on a tray.ĬAUTION: The unreacted hydrogen peroxide can irritate skin and eyes. 1 Tablespoon (15ml – one packet) of dry yeast.You can use the 3% hydrogen peroxide found in pharmacies, but the reaction will be a bit smaller) It is typically used for lightening hair and is found at many beauty supply stores. 20-Volume hydrogen peroxide liquid (20-volume is a 6% solution that is stronger than what you find in most pharmacies.A clean 16 ounce (473 ml) plastic soda bottle or a water bottle.