The famously dramatic elephant toothpaste chemistry experiment! A conical flask containing a cute purple elephant, and overflowing with foam which has a toothpaste style stripe. The experiment demonstrates a chemical reaction involving hydrogen peroxide, washing up liquid and a catalyst e.g. potassium iodide solution or yeast, which produces a sudden expanding foam full of bubbles of gas. The molecule 2H202 and the resulting 2H20 and 02 molecules are represented in the image.
