Chemistry Ocr As Author:John Older, Mike Smith OCR AS Chemistry gives comprehensive coverage of Units 1 and 2 of the OCR A-level specification. Each chapter explores the relevant specification content and includes a range of examples to equip students with the skills to succeed in the examination. An important feature of the specification is the inclusion of centre-based practical assessment... more » (Unit 3). A chapter is included to provide a clear discussion of the skills required for tackling this component. An accompanying online resource includes chapter summary worksheets and offers guidance on exam technique and sample exam-style questions, together with graded answers and detailed commentaries. OCR AS Chemistry includes the following special features: l examiner's notes -- invaluable content guidance and exam advice l worked examples -- detailed explanations of calculations and exam-type questions l l stretch-and-challenge -- extension topics and questions at the end of each chapter Answers to all review, extension and summary worksheet questions are provided in an accompanying Teacher Answer Guide, which is available for purchase by teachers.« less