Short videos of exciting demonstrations of the chemistry of everyday materials, taken from a lecture by Peter Wothers at the University of Cambridge.

Free Range Chemistry: 13 - Making Ammonia

In the past, people made ammonia gas from deer's antlers!

Free Range Chemistry: 14 - First Sources of Ammonia

Find out how ammonia got its name from an Egyptian god and some camels!

Free Range Chemistry: 15 - Rose in Ammonia

Watch how ammonia can turn a red rose black.

Free Range Chemistry: 16 - Ammonia and Water

A demonstration of how ammonia is very soluble in water.

Free Range Chemistry: 17 - Iron in Nature

Pure iron is very rarely found in nature, because it's so reactive.

Free Range Chemistry: 18 - Fine Iron Powder in Air

Fine iron powder reacts with the air causing sparks, just like in sparklers on Bonfire Night.

Free Range Chemistry: 19 - Iron Wool and Oxygen

Dramatic reaction of iron and oxygen!

Free Range Chemistry: 20 - Iron Pyrite - Fool's Gold

There's no gold in sight in fool's gold - a compound of iron and sulphur!

Free Range Chemistry: 21 - Sulphur

Where do we find sulphur in nature?

Free Range Chemistry: 22 - Burning Sulphur with Rose

Burning sulphur produces sulphur dioxide gas - watch the effect it has on a rose!

Free Range Chemistry: 23 - Minerals of Sulphur

Some of the beautiful minerals of sulphur and how we use them.