Mrs Roberts: What do you think you're made of? Mr Spellman: Big question. Grit, determination, hard-working, handsome, charming, funny. Mrs Roberts: Well, I guess. But you're actually made of atoms.

The speed of a chemical reaction is affected by temperature, concentration, particle size and the presence of a catalyst. It can be calculated by measuring changes in reactants/products. Revise: ...

In the world of chemistry, good things can happen if you just add sugar. A wide range of drugs and biochemical probes — everything from antibiotics to Alzheimer’s disease biomarkers — rely on natural ...