What explains the result?
Catalase in yeast speeds the breakdown of hydrogen peroxide, releasing oxygen that soap traps as foam.
PHYSICAL SCIENCE · GRADES 5–9
Foam fountain: catalyst speed
INVESTIGATION QUESTIONHow does the amount of yeast affect foam height?
● ILLUSTRATIVE SCIENCE MODEL
ENGLISH CAPTIONS
Make the station safe. A tray contains the spill; adult supervision is needed for dilute peroxide and cleanup.
0.0 / 3.0 s
Where does this matter?
Catalysts are used to speed processes in biology, manufacturing, and pollution control.
What should you keep in mind?
The model shows a trend only. The real activity warms up and spills; use goggles, a tray, and adult supervision.
CHEMISTRY DEMONSTRATION · YEAST CATALASE · GRADES 5–9
Elephant toothpaste
Build a foaming reaction one ingredient at a time. Watch yeast help hydrogen peroxide release oxygen, and see how soap turns invisible gas into visible foam.
SAFETY FIRSTReal demonstration: use only 3% hydrogen peroxide, safety glasses, a tray, adult supervision, and never touch or taste the foam.
REACTION RUN01 / 07
WAITING FOR NEXT ADDITION
VESSEL CAMERA · 16 OZ PLASTIC BOTTLESIMULATED · NOT LIVE CHEMISTRY
EMPTY VESSEL
SETUP NOT STARTED
SETUP NOT STARTED
SPILL TRAYREACTION VESSELSAFE DISTANCE
FOAM DYE / VISUAL TRACER
CATALYZED DECOMPOSITION2 H₂O₂ → 2 H₂O + O₂ ↑Yeast catalase accelerates the reaction; soap captures oxygen in foam.