Biological Importance of Water

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  • Biological Importance of Water
      • Oxygen pulls shared electrons towards themselves through covalent bonds- has more protons.
        • Difference in charge results in each h20 having  a net dipole moment- attraction is the hydrogen bond.
      • Relatively strong in large numbers
      • Able to pull H20 closer together so makes it harder to separate
        • reason for high boiling point
      • Responsible for the characteristic crystal lattice structure of ice
    • Water is POLAR & has many uses
      • Solvent
        • Polar substances (salt/sugar) are hydrophilic and soluble. Non-polar (oil) is hydrophobic and insoluble
      • Support
      • Transportation
      • Thermo-regulation
        • High heat capacity - large amount of energy needed to break hydrogen bonds
          • Means ocean temperatures remain stable
        • Large latent heat of vaporisation- large amount of heat absorbed to turn into water vapour, heat needed to break hydrogen bonds
          • Produces cooling effect- contributes to stability of lakes, prevents overheating in animals as they sweat
      • Metabolite
        • Water used in photosynthesis, released in respiration and moves reactants around cells
      • At 0c, water must lose a large amount of energy so at 0c crystalline lattice forms
        • Each hydrogen molecule bonded to max. of 4
        • Bonds are far enough apart to make ice 10% less dense than water


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