Table of Contents

Unit 9A Inheritance and selection 9A1 Variation 9A2 Passing on the genes 9A3 Breeding animals 9A4 Breeding plants 9A5 Inherited conditions Unit 9B Fit and healthy 9B1 Skeleton 9B2 Muscles 9B3 Eating well 9B4 Unhealthy hearts 9B5 Smoking 9B6 Alcohol and drugs Unit 9C Plants and photosynthesis 9C1 Leaves 9C2 Photosynthesis 9C3 Biomass 9C4 Roots 9C5 Why are plants important? Unit 9D Plants for food 9D1 Plants and food 9D2 Fertilisers 9D3 Growing more crops 9D4 Pests 9D5 Intensive care for plants Unit 9E Reactions of metals and their compounds 9E1 Why are metals useful? 9E2 Metals plus acids 9E3 Fizzing carbonates 9E4 Neutralisation 9E5 Preparing salts Unit 9F Patterns of reactivity 9F1 Why do metals tarnish? 9F2 Comparing reactivity 9F3 The reactivity series 9F4 Metals in competition 9F5 Uses and sources of metals Unit 9G Environmental chemistry 9G1 Soils and weathering 9G2 Acid rain 9G3 Monitoring pollution 9G4 Global warming Unit 9H Using chemistry 9H1 Burning fuels 9H2 Energy from reactions 9H3 What happens to the mass? 9H4 More about reactions Unit 9I Energy and electricity 9I1 Storing and using energy 9I2 Battery power 9I3 Generating electricity 9I4 Measuring voltagesg 9I5 Voltage and energy Unit 9J Gravity and space 9J1 Exploring the Moon 9J2 A trip into space 9J3 Exploring the Solar System 9J4 Staying in orbit 9J5 Satellites at work Unit 9K Speeding up 9K1 Measuring speed 9K2 Speeding up 9K3 Changing speed, changing direction 9K4 It’s a drag 9K5 Going up, coming down Unit 9L Pressure and moments 9L1 High pressure, low pressure 9L2 Stiletto sums 9L3 Hydraulics 9L4 Levers everywhere 9L5 Getting balanced 9L6 A matter of moments