Science Demonstrations

User Tools

Site Tools

demonstrations:elephants_toothpaste

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revision		Previous revision
demonstrations:elephants_toothpaste [2025/08/05 06:40] – meierdemonstrations:elephants_toothpaste [2025/08/08 01:39] (current) – meier
Line 11: Line 11:
 </WRAP> </WRAP>
  
-=====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://www.sciencebuddies.org/stem-activities/elephant-toothpaste]]\\ 📄 With 3% Hydrogen Peroxide and yeast catalyst: [[https://www.sciencebuddies.org/stem-activities/elephant-toothpaste]]\\
 📄 With 30% Hydrogen Peroxide and Potassium Iodide catalyst: [[https://www.thoughtco.com/elephant-toothpaste-chemistry-demonstration-604250]]\\ 📄 With 30% Hydrogen Peroxide and Potassium Iodide catalyst: [[https://www.thoughtco.com/elephant-toothpaste-chemistry-demonstration-604250]]\\
 🎞️ A very large example in a swimming pool: [[https://www.youtube.com/watch?v=Kou7ur5xt_4]]\\ 🎞️ A very large example in a swimming pool: [[https://www.youtube.com/watch?v=Kou7ur5xt_4]]\\
-🎞️ World's Tallest: [[e09xig209cQ]]\\+🎞️ World's Tallest: [[https://www.youtube.com/watch?v=e09xig209cQ]]\\
 {{youtube>Z6i1IDuWUDc?}}\\ {{youtube>Z6i1IDuWUDc?}}\\
  
-=====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.   * 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===== +====Precautions==== 
-Safety glasses required\\ +  * Safety glasses required\\ 
-Gloves may be worn\\+  * Student should stand back at least 1 metre\\ 
 +  * Gloves may be worn\\
  
-=====Questions to consider===== +====Questions to consider==== 
-  - What is the reaction occurring? +  * What is the reaction occurring? 
-  - What gas is produced? +  * What gas is produced? 
-  - What is the evidence of a gas being produced? +  * What is the evidence of a gas being produced? 
-  - What is the evidence of a chemical change? +  * What is the evidence of a chemical change? 
-  - How does the concentration of the Hydrogen Peroxide affect the reaction rate?+  * How does the concentration of the Hydrogen Peroxide affect the reaction rate?
  
-=====Further Investigation=====+====Further Investigation====
   * Compare the reaction rate with several different concentrations of Hydrogen Peroxide.   * Compare the reaction rate with several different concentrations of Hydrogen Peroxide.
   * Compare the reaction rate between using a sold Potassium Iodide, aqueous Potassium Iodide, or Yeast catalyst.   * Compare the reaction rate between using a sold Potassium Iodide, aqueous Potassium Iodide, or Yeast catalyst.