Year 8 students are beginning to learn about the differences between chemical and physical changes. Many students have had the opportunity to observe a chemical change by adding yeast to hydrogen peroxide and detergent. This results in a foaming reaction, which students can add colour to for extra effect! Although the foam looks like toothpaste, you sure wouldn’t want to brush your teeth with it!
![](https://www.aveleysc.wa.edu.au/wp-content/uploads/2021/09/IMG_9579-1024x768.jpg)