3.2 Water

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  • Created by: Lolarose
  • Created on: 22-10-17 00:11

3.2 Water 

  • OH is called a hydroxyl group it’s a negative ion (anion) meaning that the biological molecules that contain it slightly polar
  • Hydrogen bonds are relatively weak interactions which break and reform between the constantly moving water molecules 
  • Water is a small molecule
  • As water is cooled below 4ºC the hydrogen bonds fix the position of the polar molecules slightly further apart than the average distance in the liquid state
    • Forming a giant, rigid but open structure with every oxygen atom at the centre of a tetrahedral arrangement of hydrogen atoms
    • Ice floats because it’s less dense than water as the atoms are further apart
  • Cohesive properties of water

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