This work has been designed for students studying chemistry at examination level at 16+. The contents have been prepared to cover the following chemistry syllabuses: GCSE, IGCSE, and O-Level. Each chapter contains core material with additional material specific to the various different syllabuses. This enables the individual student/teacher to identify the right mix of pages according to their own individual syllabus. This book has been produced from, and replaces, the previously published GCSE Chemistry by Gallagher and Ingram. It retains this work's pagination though many pages have been replaced and updated.