Differences

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

--- demonstrations:elephants_toothpaste [2025/08/05 06:36] – meier
+++ demonstrations:elephants_toothpaste [2025/08/08 01:39] (current) – meier
@@ Line 11: / Line 11: @@
 </WRAP>
-=====Summary=====
+====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.
+====Links====
 📄 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]]\\
 🎞️ 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 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=====
+====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====
-[Things to consider for further investigation here
+  * 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.
+  * Use different colours of food colouring, or a different colour on each side of the measuring cylinder.
 ---- struct data ----
 demo.page            : Elephant's Toothpaste