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Water: the molecule of life

Water: the molecule of life. Bio I H Packet 1. Intramolecular properties of water. Intermolecular properties of water. Emergent properties of water. Cohesion Surface tension. Emergent properties of water. Adhesion. Emergent properties of water. Cohesion + Adhesion  capillary action.

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Water: the molecule of life

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  1. Water: the molecule of life Bio I H Packet 1

  2. Intramolecular properties of water

  3. Intermolecular properties of water

  4. Emergent properties of water • Cohesion • Surface tension

  5. Emergent properties of water • Adhesion

  6. Emergent properties of water • Cohesion + Adhesion capillary action

  7. Emergent properties of water • “Universal solvent”

  8. Emergent properties of water • Unique density as a solid compared to a liquid

  9. Why is “ice floats” important? • Oceans & lakes don’t freeze solid • surface ice insulates water below • allowing life to survive the winter • if ice sank… • ponds, lakes & even oceans would freeze solid • in summer, only upper few inches would thaw

  10. Emergent properties of water: specific heat • H2O resists changes in temperature • high specific heat • takes a lot to heat it up • takes a lot to cool it down • H2O moderates temperatures on Earth

  11. Specific heat& climate

  12. Emergent properties of water: high heat of vaporization Organisms rely on heat of vaporization to remove body heat Evaporative cooling

  13. Elixir of Life • Special properties of water 1. cohesion & adhesion • surface tension, capillary action 2. good solvent • many molecules dissolve in H2O 3. lower density as a solid • ice floats! 4. high specific heat • water stores heat 5. high heat of vaporization • Heats slowly

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