9 Space Travel
9.1 Forces
9.2 Friction
9.3 Force of Gravity
9.4 A Space Journey
9.5 Life of an Astronaut in Space
9.6 Space Exploration
Summary
Glossary
Key Points
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10 Common Acids and Alkalis
10.1 Common Acids and Alkalis
10.2 Testing Acids and Alkalis with Indicators
10.3 Acids and Corrosion
10.4 Acid Rain
10.5 Neutralisation
10.6 Everyday Uses of Acids, Alkalis and Neutralisation
10.7 Dangers of Acids and Alkalis
Summary
Glossary
Key Points
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11 Sensing the Environment
11.1 Sensing the Environment
11.2 How Do We See?
11.3 Limitations of the Eye
11.4 Defects of the Eye
11.5 How Do We Hear?
11.6 Limitations of Our Ears
11.7 Effects of Noise Pollution
11.8 Senses of Smell, Taste and Touch
11.9 The Brain and Our Senses
11.10 Responses to Stimuli
11.11 Effects of Drugs and Solvents on Our Senses
Summary
Glossary
Key Points
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Index