Written by well-respected authors, the Cambridge Checkpoint Science suite provides a comprehensive, structured resource which covers the full Cambridge Secondary 1 framework and seamlessly progresses into the next stage. Checkpoint Science Challenge Workbook 9 provides targeted additional exercises that aim to stretch students to develop deeper knowledge and understanding, and to further refine their scientific skills. Using an active-learning approach the workbook aims to encourage and motivate students and promote scientific enquiry. Contents Introduction; Biology: 1. Plants; 2. Living things in their environment; 3. Variation and inheritance; Chemistry: 4. Material properties; 5. Energy changes; 6. Reactivity; 7. Salts; 8. Rates of reactions; Physics: 9. Forces in action; 10. Electricity; 11. Energy. Author: Mary Jones, Diane Fellowes-Freeman, Michael Smyth