In this activity, students are wowed by the chemical reaction between hydrogen peroxide, yeast, and dish soap when they make elephant's toothpaste - so much foam! In this grades version, students are introduced to chemical reactions including: chemical equations, exothermic and endothermic reactions, reactants and products. This is a class favoriete - it is so exciting and has major wow factor. The activity can be done as a teacher demonstration, or working in lab groups. After completin