demonstrations:elephants_toothpaste
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| demonstrations:elephants_toothpaste [2025/08/05 06:33] – meier | demonstrations:elephants_toothpaste [2025/08/08 01:39] (current) – meier | ||
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| - | =====Summary===== | + | ====Summary==== |
| {{$demo.summary}} | {{$demo.summary}} | ||
| - | =====Procedure===== | + | ====Procedure==== |
| A small teaspoon of solid Potassium Iodide, a squirt of detergent, and a few drops of food colouring are put into a measuring cylinder of any size placed into a tray. 30% Hydrogen Peroxide is added, and coloured foam is formed rapidly, spurting out of the top. | A small teaspoon of solid Potassium Iodide, a squirt of detergent, and a few drops of food colouring are put into a measuring cylinder of any size placed into a tray. 30% Hydrogen Peroxide is added, and coloured foam is formed rapidly, spurting out of the top. | ||
| + | ====Links==== | ||
| 📄 With 3% Hydrogen Peroxide and yeast catalyst: [[https:// | 📄 With 3% Hydrogen Peroxide and yeast catalyst: [[https:// | ||
| 📄 With 30% Hydrogen Peroxide and Potassium Iodide catalyst: [[https:// | 📄 With 30% Hydrogen Peroxide and Potassium Iodide catalyst: [[https:// | ||
| 🎞️ A very large example in a swimming pool: [[https:// | 🎞️ A very large example in a swimming pool: [[https:// | ||
| - | {{youtube> | + | 🎞️ World' |
| - | {{youtube> | + | {{youtube> |
| - | + | ====Variations==== | |
| - | =====Variations===== | + | * Using 3 or 6% Hydrogen Peroxide will make the foam form much slower, but it will still overflow the measuring cylinder. |
| - | * Using 3 or 6% Hydrogen Peroxide will make the foam form much slower, but it will still overflow the measuring cylinder | + | |
| * Using a conical flask instead of measuring cylinder can make the foam shoot higher, and it can reach the roof. | * Using a conical flask instead of measuring cylinder can make the foam shoot higher, and it can reach the roof. | ||
| + | * Putting a glowing splint into the foam afterwards can make it glow brighter, but the foam also helps to extinguish it so it probably can't be made to relight. | ||
| + | ====Precautions==== | ||
| + | * Safety glasses required\\ | ||
| + | * Student should stand back at least 1 metre\\ | ||
| + | * Gloves may be worn\\ | ||
| + | ====Questions to consider==== | ||
| + | * What is the reaction occurring? | ||
| + | * What gas is produced? | ||
| + | * What is the evidence of a gas being produced? | ||
| + | * What is the evidence of a chemical change? | ||
| + | * How does the concentration of the Hydrogen Peroxide affect the reaction rate? | ||
| - | + | ====Further Investigation==== | |
| - | + | * Compare the reaction rate with several different concentrations of Hydrogen Peroxide. | |
| - | Video: | + | * Compare the reaction rate between using a sold Potassium Iodide, aqueous Potassium Iodide, or Yeast catalyst. |
| - | {{youtube> | + | * Use different colours of food colouring, or a different colour on each side of the measuring cylinder. |
| - | + | ||
| - | =====Precautions===== | + | |
| - | [Precautions here] | + | |
| - | + | ||
| - | =====Links===== | + | |
| - | [Links here] | + | |
| - | + | ||
| - | [[https:// | + | |
| - | + | ||
| - | + | ||
| - | =====Questions to consider===== | + | |
| - | [Questions to consider here] | + | |
| - | + | ||
| - | =====Further Investigation===== | + | |
| - | [Things to consider for further investigation here | + | |
| ---- struct data ---- | ---- struct data ---- | ||
| demo.page | demo.page | ||