A pdf presentation covering all you need to know for AS Chemistry Topic 1: Formulae, Equations and Amounts of Substances. 119 slides of detailed notes, step by step examples and practice questions with anwers! Created by a student who acheived A* in A level Chemistry. Covers: ionic equations, typical reactions of acids, displacement reactions, precipitation reactions, moles, mass calculations, reacting masses, empirical formula, molecular formula, percentage yield, atom economy, pa...