Elephant toothpaste is a foamy substance caused by the rapid decomposition of hydrogen peroxide using potassium iodide or yeast and warm water as a catalyst. How rapidly the reaction proceeds will depend on the concentration of hydrogen peroxide. Because it requires only a small number of ingredients and makes a “volcano of foam”, this is a popular experiment for children to perform in school or at parties. The experiment is also known as the “marshmallow experiment”.

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