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Awesome Chemistry Demo: “Elephant Toothpaste”

Awesome Chemistry Demo: “Elephant Toothpaste”. Supplies needed:. RED and GREEN food coloring Regular dish soap 30% Hydrogen Peroxide (H 2 O 2 ) Potassium Iodide. Equipment needed:. Graduated cylinder (500 mL)* Large pan or container Small beaker (250 mL) Scoopula Goggles

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Awesome Chemistry Demo: “Elephant Toothpaste”

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  1. Awesome Chemistry Demo: “Elephant Toothpaste”

  2. Supplies needed: RED and GREEN food coloring Regular dish soap 30% Hydrogen Peroxide (H2O2) Potassium Iodide

  3. Equipment needed: Graduated cylinder (500 mL)* Large pan or container Small beaker (250 mL) Scoopula Goggles Lab coat or apron Rubber gloves

  4. Safety Considerations Goggles, lab coat/apron, and rubber gloves must be worn because: H2O2 can bleach skin/clothing. H2O2 may cause burns to eyes/skin. Iodine leaves stains. LEAVE GLOVES ON FOR CLEAN UP!

  5. Procedure • Measure out approximately 20 mL of Hydrogen Peroxide (H2O2) using the small beaker. Pour it into the large graduated cylinder. • Squeeze a reasonable amount of dish soap into the cylinder and swirl to mix. • Drizzle a few drops of RED food coloring down the inside wall of the cylinder, and GREEN down the inside wall opposite it.

  6. The Fun Part! • Make sure the large graduated cylinder is sitting in the pan, or on a flat, washable and stain resistant counter. • Use the scoopula to take out a heaping scoopful of Potassium Iodide. • Quickly add the Potassium Iodide to the prepared graduated cylinder and stand back!

  7. What just happened? Hydrogen peroxide naturally breaks down into water and oxygen. The potassium iodide simply acts as a catalyst making the reaction occur much more quickly! The soap simply traps the oxygen being released. The bubbly mess shoots out of the cylinder very quickly and looks like a large tube of toothpaste, hence the name: “Elephant Toothpaste”!

  8. Teaching Points • This is an exothermic reaction. • H2O2 naturally breaks down into water (H2O) and O2 overtime. • KI acts as a catalyst. • This is an example of a decomposition reaction. • Chemical equations must be balanced.

  9. More Teaching Points! • The Law of Conservation of Masscan be explained using the balanced equation: 2H2O2 = 2H2O + O2 • Naming of ionic compounds and covalent (molecular)compounds. • The occurrence of diatomic elements is illustrated in O2.

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