What is a mole in chemistry GCSE? Chemists measure the amount of a substance in a unit called 'the mole'. ... It allows chemists to make predictions about the masses of different substances that are involved in reactions. One mole isthe Avogadro number of particles (atoms, molecules , ion...
Ocr gcse chemistry Moles and empirical formulaeName the two products formed when molten lead bromide is electrolysed. [F]Label the diagram