I used to make these for the kids in my chemistry class.
1 beaker
50 ml Nitric acid
Step back and watch the clouds of brown gas and violent bubbling.
Remove coin for an object lesson helping them remember what nitric acid does to metals.
Replace coin and repeat this exercise until the disc is mostly unrecognizable as a quarter anymore!
How much squash could a Sasquatch squash if a Sasquatch would squash squash?
Download and read: Grading the graders
Costly
TPG ineptitude and No FG
Kennedy halveshttps://ln5.sync.com/dl/7ca91bdd0/w...i3b-rbj9fir2