At Queenswood school in the UK, David Boyce and his class are growing what they’re calling the world’s largest single crystal of copper sulfate, taking a classic school experiment to the next level.
While their crystal weighs in at around 3kg, the Guinness world record for the biggest copper sulfate crystal is still held by a class of 8th year students in Germany, who grew an enormous 70kg polycrystalline crystal in 2010.
But what other chemical classroom feats have received a Guinness World Record?
When life gives you lemons
Using a galvanised nail and a copper penny as electrodes and lemon juice as an electrolyte can create a rudimentary battery. When the zinc-coated nail is pushed into a lemon, the mild citric acid in the fruit oxidises the metal anode,…