Biology: Water

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  • Created by: Caitlin
  • Created on: 05-05-13 18:33
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  • Water
  • Solvent properties
    • Metabolic process rely on chemicals reaction i.e respiration, photosynthesis
    • Solubility = whether water molecules can interact with substances
    • Polar molecules will dissolve
    • Water
  • Metabolic process rely on chemicals reaction i.e respiration, photosynthesis
  • Solubility = whether water molecules can interact with substances
  • Polar molecules will dissolve
  • Density and freezing
    • Ice is less dense than water
      • Density and freezing
      • Ice acts as insulating layer - water beneath less likely to freeze - higher temp.
        • Polar bears hunt on floating ice - lakes do not freeze completely so organisms can live
          • Surface tension/cohesion
            • Plant transport: xylem uses cohesion to pull up water
            • Cohesion makes long thin water columns strong + difficult to break
          • Water molecules stick together creating surface tension
            • Surface tension/cohesion
              • Plant transport: xylem uses cohesion to pull up water
              • Cohesion makes long thin water columns strong + difficult to break
          • Organisms make use of surface tension to 'walk on water'
            • Thermal stability
              • Hydrogen bonds in water restrict movement of water molecules - energy needed to increase water temp.
            • Evaporation cools surfaces by removing heat
              • Thermal stability
                • Hydrogen bonds in water restrict movement of water molecules - energy needed to increase water temp.
            • Animals use evaporation - panting and sweating
              • Evaporation cools surfaces by removing heat
              • Oceans provide stable environment in terms of temp.

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