Record-breaking chemistry experiments: from giant crystals to lemon batteries

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?