F212 OCR BIOLOGY- WATER AS A BIOLOGICAL MOLECULE

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a) Describe how hydrogen bonding occurs between H20 molecules and relate this ot their other properties and roles of water to living organisms.

  • The atoms are covalent bonded
  • Oxygen is more electronegative than Hydrogen so Oxygen is slightly negative and Hydrogen is slightly possitive.
  • Other water molecules are attracted to each other by hydrogen bonding. Oxygen is slightly negative so experiences an attraction to the slightly possitive Hydrogen.

High specific heat capacity: energy needed to break hydrogen bonds between water molecules so less heat energy is available to raise the tempreature of the individual molecule. This is useful because

  • it maintains the tempreatur of an organism
  • acts as a medium for chemical reaction.

High latent heat of vaporisation: This means that water needs a lof of heat energy to change water molecules to water vapour. This occurs in transpiration in plants and sweating in mammals.This…

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sena

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this is really cool,thanks!!

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