Bubbles and heat, steam and foam. With the Old Foamey: Decomposition of Hydrogen Peroxide—ChemTopic™ Lab Activity, mix hydrogen peroxide with dishwashing liquid, add sodium iodide catalyst, then stand back and observe the decomposition reaction as it erupts in a wall of cascading foam. Available as part of the Chemical Reactions—ChemTopic™ Labs digital collection. Click the Price link for digital collection pricing.