This is definitely a favorite activity! In this experiment, students watch the chemical change that happens when hydrogen peroxide, yeast, and dish soap react to make ELEPHANT'S TOOTHPASTE - SO much foam! This lab is so exciting and has major wow factor! In this version, students learn about physical and chemical changes with this fun reaction! The activity can be done as a teacher demonstration, or working in lab groups. After completing the activity, students read about physical and chem