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🧪 ChemistryMedium

Simple Elephant Toothpaste Challenge

25 minutes 7 materials Ages 7-12

⚠️ Safety Warning

Use 12% hydrogen peroxide with adult supervision. Can irritate skin — wear gloves. Do not touch the foam immediately as it may be warm.

All experiments require adult supervision.

Materials You'll Need

Gather these 7 items before starting

💡 Make sure this item is clean and ready before starting.
💡 Active dry yeast from the baking section.
💡 Use room temperature water unless specified otherwise.
💡 A few drops is usually enough - don't overdo it!
💡 Liquid food coloring gives the best results.
💡 A clean, empty water or soda bottle.
💡 Helps contain any spills or messes.

💡 Tip: Check off items as you gather them to stay organized!

Step-by-Step Instructions

Follow these 8 steps carefully

1

For this simple version, place the plastic bottle on the tray to catch overflow.

📍Tip: Make sure you have a clean, flat workspace before starting.
2

Pour half a cup of hydrogen peroxide into the bottle.

🫗Tip: Pour slowly and steadily. Use a funnel if you have one!
3

Add a big squirt of dish soap and several drops of food coloring. Swirl gently.

🤲Tip: Take your time and be gentle. Rushing can lead to mistakes.
4

In a separate cup, mix the yeast packet with 3 tablespoons of warm water and stir for 30 seconds.

🥄Tip: Stir gently but thoroughly until well combined.
5

When you are ready for the big reaction, pour the yeast mixture into the bottle.

🥄Tip: Stir gently but thoroughly until well combined.
6

Step back and watch as a massive foam snake erupts from the bottle!

🔍Tip: Write down or draw what you see. Scientists always record their observations!
7

Feel the bottle — it will be warm because this reaction produces heat (exothermic).

🔥Warning: Adult supervision required! Hot items can cause burns.
8

Try different bottle shapes for different foam effects.

🧪Info: This is where the science happens! Pay close attention to what occurs.

✅ Remember: Take your time with each step and ask an adult for help if needed!

The Science Behind It 🔬

Hydrogen peroxide naturally breaks down into water and oxygen, but very slowly. The yeast acts as a catalyst — it contains an enzyme called catalase that dramatically speeds up this decomposition. The oxygen gas is released very quickly, and the dish soap captures it in millions of tiny bubbles, creating the giant foam snake. The reaction also releases heat energy, which is why the bottle feels warm. This is called an exothermic reaction. Catalysts are incredibly important in chemistry and biology — your body uses thousands of enzyme catalysts every second! Engineers apply this knowledge to build everything from spacecraft to medical devices.

Grade Levels

2nd Grade3rd Grade4th Grade5th Grade

Materials

Hydrogen peroxide (12%)Dry yeast packetWarm waterDish soapFood coloring