I'm doing this with my year 7s tomorrow. Has anyone got any advice? I'm trying to figure out learning outcomes and questions and stuff for them. They've now finished the topic so it's just a fun lesson and I'm going to try to get in some revision in the hour also. It's my last lesson with them (other than the test on thursday) so I wanted them to have fun. Also, they're going to be taught my substitute teachers for a while after I go so I wanted to do a lab to entertain them. What are the main teaching points? I'm going to get them to note down any changes they observe, like heat when the water is added to the sodium carbonate, and fizing,a nd the colour changes of the indicator.