I wonder how many IB chemistry teachers (and indeed IB students) first came across chemistry by being given a chemistry set when they were a child? I certainly did and I still have it!Mine was a Lott"s chemistry set and one of the chemicals was copper(II) sulfate pentahydrate, CuSO4.5H2O. Even after all these years, the crystals are still in remarkably good shape.My first chemistry setAlmost all of your students are...