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WATER

WATER. Chemical formula; H 2 O What do you know about water? Write it in your notebooks. Today we are learning about……. The structure of water (CC1). Properties of water (CC3). Water as a solvent and carrier of substances (CC4). http://www.youtube.com/watch?v=DAilC0sjvy0&feature=fvwrel.

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WATER

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  1. WATER Chemical formula; H2O What do you know about water? Write it in your notebooks

  2. Today we are learning about…… • The structure of water (CC1). • Properties of water (CC3). • Water as a solvent and carrier of substances (CC4)

  3. http://www.youtube.com/watch?v=DAilC0sjvy0&feature=fvwrel

  4. Properties of Water • Water is the commonest substance on the surface of the Earth • It is essential to all life • Only 1% of the water supply here on Earth is suitable for drinking • Boiling point of pure water is 100° C • The freezing point of pure water is 0° C

  5. The Water Cycle • Three states; solid, liquid gas (ice, liquid water, water vapour) • Water; • Evaporates as steam from the sea, a lake or the ground • Forms steam • Rises up in the atmosphere • Forms clouds • Condensatesinto a liquid, semi-solid or solid again and falls down on Earth (as rain, hail or snow)

  6. Chemical bonding in water • Covalent bonds between Oxygen and Hydrogen (sharing of electrons) • Hydrogen is a very funny element! • Creates negative and positive charges-just like a magnet! • This is called hydrogen bonding and makes the water molecules stick together. • The hydrogen bonds are responsible for surface tension in water.

  7. Water treatment The different stages of water treatment • The water collects in a reservoir • A screen removes large objects, like bikes, mud, soil, stones and pieces of wood. • The water is then stored in a settling tank for a while in order for the smaller particles to fall to the bottom. • The water is then filtered through stones and sand in order to remove any remaining small particles. • In some countries, not in Sweden, the water is then treated with chlorine in order to kill bacteria-this happens by bubbling chlorine gas through the water. • The water is now ready to drink!!!

  8. Task • What do we use water for in our everyday life? (CC1) • Explain what the water cycle shows. (CC3) • Discuss how global warming or pollution can affect the water cycle. (CC4)

  9. Possible answers • List everyday uses. • The water cycle shows natural changes from one state to another. • Changes in climate can affect the water cycle.

  10. Useful links • http://www.youtube.com/watch?v=KiZJOTt3Dl0 • Chemical structure and bonding in water • How water treatment works

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