This film discusses the halogens, specifically chlorine, bromine, and iodine, detailing their preparation from naturally occurring salts and their chemical properties. The film demonstrates various ...

It's been difficult to explain patterns of toxic mercury in some parts of the world, such as why there's so much of the toxin deposited into ecosystems from the air in the southeastern United States, ...

The questions in this quiz are suitable for GCSE combined science students studying reactions and temperature changes, reaction profiles, and explaining energy changes. If you struggled with the quiz, ...