Hydrogen Bonds & Properties of water

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  • Created by: Ellie678
  • Created on: 01-10-15 16:09

Hydrogen Bonds

  • Electromagnetic attraction between polar molecules in when hydrogen is bound to oxygen.
  • Not a Covelent bond as they don't share electrons.
  • It is an attraction between the positive and negative poles of charged atoms.
  • It is a polar molecule because oxygen atoms are slightly negative and hydrogen atoms are slightly positive.

 

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Cohesion

  • Cohesion - Water molecules bind more which creates surface tension
  • Resistance to force applied by insects - lets them walk on water.
  • Movement of columns of water againest gravity in the xylem
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Ice less dense than water

  • Ice - Below 4°C, hydrogen bonds lengthen pushing water molecules apart.
  • Ice layer insulates the body of water reducing the rate of heat loss.
  • Stable envrioment for aquaticc organisms through the winter.
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Good Solvent

  • Good solvent - ions disociate because they are polar.
  • Transport of molecules and ions around an organism/plasma membranes.
  • Flow occurs due to hydrogen bonds constantly forming/breaking
  • Non-polar molecules cannot dissolve
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High Specific Heat Capacity

  • High specific heat capacity - hydrogen bonds need a lot of energy to break them
  • Thermal stability - aqautic organisms do not have a great fluctuation in the temperature
  • Stable temperature needed for enzyme reactions
  • Helps buffer temperature changes due to chemical reactions
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Liquid at Room Temperature

  • Liquid at room temperature - High BPt
  • Provides habitats for living things
  • Forms a major component of tissues in living things
  • Provide a reaction medium for chemcial reactions 
  • Provide an effective transport medium
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High Latent Heat of Vaporization

  • High latent heat of vapourization - high amount of energy is needed to change state
  • Effective cooling in plants and animals 
  • A lot of heat energy is taken away when a small number of water molecules evaporate.
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