This lesson adds 4 compounds to a beaker of water. The solubility of the compound is revealed. It could easily be modified by the students for other compounds given to them.
I've created a manual for teachers and students, which goal is to help them to take their first steps with Scratch. The book is under CC 3.0 license and it's in Polish language.
After teaching students some basics (stage, sprites, costumes, loops, movement, ask/answer, broadcast/receive, variables), I challenged them to create their own projects.
What helps you to support people learning with Scratch? With resources, you can share all types of content, across different curricular areas and ages.