Cards (9)

  • Strong cohesion between water molecules
    due to hydrogen bonds it provides surface tension and plants use this to transport water from the roots to leaves.
  • ice is less dense than water
    due to hydrogen bonding and arrangement of molecules in water
    • ice less dense so floats on water, organisms can live on the surface
    • provides insulating layer preventing the water below getting too cold.
  • good metabolite
    hydrolysis reaction- bond is broken and water molecule used up.
    condensation reaction- new bond is formed and a water molecule is released.
  • large latent heat of vaporisation
    molecules move at fast speeds so they have enough kinetic energy to escape= evaporation
    the kinetic energy moves with them decreasing the kinetic energy in the water
  • high specific heat capacity
    water has large SHC so absorbs large amounts of heat energy before it's temperature raises a large amount.
    • bodies of living organisms are mostly made of water, the water in and around our cells absorbs a lot of heat energy without the temp increasing too much. This allows enzymes to continue functioning.
    • advantage for aquatic organisms as large bodies of water don't change temperature as quickly.
  • good solvent
    ions and polar molecules can easily dissolve in it.
  • importance
    -reactant in cells
    -provides structural support in cells
    -keeps organisms cool to maintain an optimum body temperature.
  • polar molecule 

    electrons are not evenly distributed across the molecule
  • hydrogen bonding
    hydrogen from one water molecule bonds to an oxygen from another water molecule.
    • hydrogen is slightly negative
    • oxygen is slightly positive