Produced in partnership with OCR for the 2008 OCR A Level Chemistry B (Salters) specification, this revised Chemical Ideas AS/A2 Student Book explains chemical principles essential for the understanding of the accompanying AS and A2 Chemical Storylines Student Books. Written by experienced examiners, teachers and members of the University of York Science Education Group (UYSEG). Progressive problems for each section test and develop students' understanding of the concepts covered. Abundant questions ensure students get plenty of practice. Margin boxes, emboldened key words, diagrams help reinforce key concepts.