Differences

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--- demonstrations:elephants_toothpaste [2025/08/04 11:27] – Struct data changed meier
+++ demonstrations:elephants_toothpaste [2025/08/08 01:39] (current) – meier
@@ Line 11: / Line 11: @@
 </WRAP>
-=====Summary=====
+====Summary====
 {{$demo.summary}}
-=====Procedure=====
+====Procedure====
-[Procedure here]
+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.
-Could include embedded videos.  This is the procedure, with a long paragraph of text.  This is the procedure, with a long paragraph of text.  This is the procedure, with a long paragraph of text.  This is the procedure, with a long paragraph of text.  This is the procedure, with a long paragraph of text.  This is the procedure, with a long paragraph of text.
+====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: [[https://www.youtube.com/watch?v=e09xig209cQ]]\\
+{{youtube>Z6i1IDuWUDc?}}\\
-  - Ordered List Item
+====Variations====
-  - Item 2
+  * 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.
-  * Unordered List Item
+====Precautions====
-  * Item 2
+  * Safety glasses required\\
+  * Student should stand back at least 1 metre\\
+  * Gloves may be worn\\
-Video:
+====Questions to consider====
-{{youtube>7VGlBZOywIg?}}
+  * 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?
-=====Precautions=====
+====Further Investigation====
-[Precautions 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.
-=====Links=====
+  * Use different colours of food colouring, or a different colour on each side of the measuring cylinder.
-[Links here]
-[[https://www.google.com]]
-=====Questions to consider=====
-[Questions to consider here]
-=====Further Investigation=====
-[Things to consider for further investigation here
 ---- struct data ----
 demo.page            : Elephant's Toothpaste
@@ Line 49: / Line 52: @@
 demo.difficulty_description : ★★☆ Can be done by science teachers
 demo.difficulty      : ★★☆
-demo.safety_description : ★★★ Only to be attempted with adequate safety procedures and trained staff
+demo.safety_description : ★★☆ Some safety precautions required to perform safely
 demo.safety          : ★★☆
 demo.summary         : 30% Hydrogen peroxide is added to a Potassium Iodide catalyst, detergent and food colouring, and Oxygen bubbles rapidly produce a foam.
 ----