Corrosion Demos This page has an amazing demonstration for corrosion, incredibly visual and fast to show in a classroom setting. This is a very good way to show corrosion actively happening rather than the usual nails in large conical flasks (which does look impressive over time, but not on the short term). Showing corrosion with nails in a flask also tends to ruin some of the glassware so can be pretty wasteful, petri dishes are supposed to be disposable! The link also includes the student sheet and slides for teaching with.
I can’t wait to try this one!