Students will get to see an exothermic reaction and an oxidation-reduction reaction all in one. Hydrogen peroxide reacts with soap and a catalyst to create a huge plume of foam that resembles toothpaste being squeezed out of a tube. In the adult version, 10, 20, or 30% hydrogen peroxide reacts with beef liver or sodium iodide as the catalyst; both catalysts cause a fast reaction with beef liver eliminating any chemical waste. In the kid’s version, yeast or beef liver act as the catalysts on a household (3%) hydrogen peroxide which is a slower but equally effective reaction. The addition of the catalyst allows the hydrogen peroxide to break down into oxygen gas and water. While the reaction is going on, the oxygen gas being released forms bubbles in the soap resulting in a tube of bubbles leaving a graduated cylinder. Dyes can be added for different colors and different catalysts can be used to make it faster or slower.