Water for life
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## Contents

- Introduction
- Learning outcomes
- 1 The power of water
- 2 Earth's store of water
  - 2.1 Where water occurs and how we measure it
  - 2.2 Going up: using scientific notation for large numbers
    - 2.2.1 Using a calculator for scientific notation
  - 2.3 The study of a raindrop
  - 2.4 Going down: using scientific notation for small numbers
  - 2.5 What is water made of?
  - 2.6 Models of a water molecule
    - 2.6.1 (a) Using Lego as a model
    - 2.6.2 (b) Using spheres
  - 2.7 The 'salt' in seawater
- 3 What are compounds?
- 4 Inside the atom
- 5 Molecules and covalent bonding
- 6 Chemical language
  - 6.1 Introduction
  - 6.2 Chemical symbols
  - 6.3 Chemical formulas
  - 6.4 Chemical equations and chemical reactions
    - 6.4.1 Writing a chemical equation to describe a chemical process
- 7 Ions and ionic bonding
- 8 Water and its impurities
- Conclusion
- Keep on learning
- Acknowledgements

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