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BiologyExchange.co.uk Shared Resource BiologyExchange.co.uk Shared Resource Presentation Transcript

  • Water
  •  
  • Water
    • Water is a polar molecule
    • Therefore it is a good solvent
    O H H + + -
  • Water
    • It forms weak hydrogen bonds
    • It remains a liquid over a wide temperature range
    • Water molecules stick to other substances = adhesion (capillarity)
    • Water molecules stick to one another = cohesion (surface tension)
    Water
  • Water
    • It has a high specific heat capacity – so water can maintain a reasonably constant temperature (essential for marine organisms)
    • It has a high latent heat of evaporation – so animals use water to cool themselves
    • It is less dense as a solid (ice)…
    • … and ice is a poor conductor