Create a massive, foaming eruption that looks like a giant tube of toothpaste! You will learn about exothermic reactions and how catalysts make chemical reactions happen faster.

Tools

• large plastic funnel
• measuring cup
• stirring rod or large spoon

Materials

• large plastic soda bottle or 2-liter flask (1)
• hydrogen peroxide (6% concentration, 1 cup)
• liquid dish soap (2 tbsp)
• food coloring (5 drops)
• dry yeast (1 packet/2.25g)
• warm water (3 tbsp)
• large plastic tray or kiddie pool (1)
• small mixing cup (1)

Safety

• Adult supervision is strictly required.
• Wear safety goggles to protect eyes from peroxide splashes.
• Hydrogen peroxide can irritate the skin; wear gloves or wash hands immediately after contact.
• Perform this experiment outdoors as the foam can be very messy and voluminous.
• Protect work surface. Materials may stain clothing.

Steps

1. Place the large plastic bottle in the center of the plastic tray or kiddie pool to catch the overflow.
2. Using the funnel, pour 1 cup of hydrogen peroxide into the bottle.
3. Add 2 tablespoons of liquid dish soap to the bottle and swirl gently to mix.
4. Add 5 drops of food coloring along the inside walls of the bottle to create colorful stripes in the foam.
5. In the small mixing cup, combine 1 packet of dry yeast with 3 tablespoons of warm water.
6. Stir the yeast and water mixture for about 30 seconds until it is well combined and dissolved.
7. Quickly pour the yeast mixture into the bottle and step back immediately.
8. Watch as the catalyst (yeast) breaks down the peroxide, releasing oxygen gas and creating a giant fountain of foam!