A mole is a measurement of a ‘batch’ of particles. It is easier to describe the number of moles of a substance rather than the number of atoms as atoms are very small. Relative atomic mass is the ...

A titration is practical technique where two solutions are accurately reacted with each other. Titrations be used to calculate unknown concentrations of solutions and to identify unknown compounds.

Sun damage can result in skin cancer. A NHS Choices interactive test advises whether you should seek help from your doctor (Jorge Guerrero/AFP/Getty Images) An interactive test could help flag up ...