This text book has been revised and updated to cover the new syllabuses for GCSE Chemistry introduced after the implementation of the National Curriculum. The book looks into the part chemistry plays in people's lives, in industry and society, explaining principles and problems. Questions on every page and the end of every section help consolidate the learning process. A new activities section has been added to the end of every section as well. The new material is: nitrogen and its compounds, mineral chemistry, sulphur and its components, industrial processes, organic chemistry, the Earth's resources, the Earth and its atmosphere.