This is a simple, but effective, lesson which will demonstrate chemical changes in substances, changes in states of matter and the different density of gases. It can be done either as a demonstration or as a group experiment depending on the age and maturity level of your class. As always with science experiments, I would suggest trying it on your own first to make sure you know what will happen with a class full of kids!
Canary in a Coal Mine
by Pat Koslowsky-Wiebe
is licensed under a Creative Commons Attribution 4.0 International License