Air and water

A video about the energy changes involved in chemical reactions, whether exothermic or endothermic.

Dr Maggie Aderin-Pocock and Dr Alex Lathbridge investigate exothermic and endothermic reactions.

Alisha Kakar explains how to balance chemical equations

Alisha Kakar explains which gases scientists think may have been present in Earth’s early atmosphere

Alisha Kakar explains why the carbon dioxide in Earth’s atmosphere decreased millions of years ago.