an activity series helps us to predict if a reaction will occur when a piece of elemental metal is placed in water, an acid solution, or a solution containing the ion of another metal.
Do we all have a unit at the end of the semester that seems to change in depth every year, based on how the rest of the semester has shaken out? In my course progression, that unit is Reactions.
I found a version of this demonstration online a couple of years ago. I admit, when I first tried it with my class it was mostly for a crowd pleaser to demonstrate the activity series of metals, but I then became very intrigued by the processes occurring.