The yeast contains an enzyme called Catalase that breaks down hydrogen peroxide (H 2O 2) into oxygen gas and water. Pour 2 inches of hydrogen peroxide (3%) into the bottle. Prepare yeast solution by adding dry yeast to warm water and wait a few minutes until it becomes frothy.
Since you can’t get these materials at home we have a Kids Safe version of this demonstration that you can do at home or in the classroom! Do this at your next family night, slumber party or birthday party. If you were to touch this foam, your hand would be stained yellow just as if you put iodine on your skin. The reaction produces oxygen gas, water and iodine. The oxygen gas produced gets trapped in the soap which produces the big ball of foam. This essentially produces water and oxygen gas (H 2O + O2). The sodium iodide reacts with the hydrogen peroxide (H 2O 2) by removing an oxygen atom. The 30% hydrogen peroxide is not something you would put on a cut or scrape, but it works perfectly for this demonstration. That is usually 3% hydrogen peroxide, and your local salon probably uses 6%. This is 10 times stronger than the hydrogen peroxide that you have in your medicine cabinet. The hydrogen peroxide used in the demonstration is 30% hydrogen peroxide. First we pour in the hydrogen peroxide, then the soap and finally the sodium iodide. This large demonstration uses hydrogen peroxide (H 2O 2), sodium iodide (NaI) and soap. So if you want to see it again just come on in! Our EXTREME Scientists do the Elephant’s Toothpaste demonstration in our Extreme Science Theater located on the lower level of the science center.
It is, of course, not toothpaste so please do not try to brush your teeth with it! The kids safe version below is harmless but certainly wouldn’t taste very good.
It is so big that only an elephant could use toothpaste this large. This demonstrations is called Elephant’s Toothpaste because the chemical reaction produces a large foamy mess that looks like toothpaste squirting out of a tube.
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