Water

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  • Created by: Rachelezy
  • Created on: 29-01-20 19:26

Hydrogen Bonding

Hydrogen Bonding:

  • Electrostatic forces - part of the molecule is negative and part is positive
  • When a charged ion is introduced, it can disrupt the hydrogen bonding

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Specific Heat Capacity

Specific Heat Capacity:

  • Relatively high
  • Help to sustain 37 degree body temperature - ensures a minimal change of temperature
  • Amount of energy needed to raise the temperature of 1kg by 1 degree
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Latent Heat Of Vaporisation

Latent Heat Of Vaporisation:

  • Relatively high
  • Sweating = cooling = regulating internal body temperature (provides a cooling effect with little loss of water through evaporation
  • Phase change = state change (energy absorbed within phase change)
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Surface Tension

Surface Tension:

  • Makes water from droplets and allows it to support small objects
  • Has a low viscosity and high surface tension because of hydrogen bonds between its molecules
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Cohesion

Cohesion:

  • Sticking together of particles of the same substance
  • Holds hydrogen bonds together to create surface tension in water
  • Has strong cohesion between water molecules (this supports columns of water in the tube-like transport cells of plants and produces surface tension where water meets air
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Water as a Solvent & Buffer

Water As A Solvent:

  • Good at dissolving ions and polar (uncharged) molecules]
  • The important solvent in which metabolic reactions occur

Water As A Buffer:

When acidic substances enter the bloodstream, bicarbonated ions neutralise the hydronium ions, forming carbonic acid and water.

Carbon Acid - Component of the buffering system of the blood

Water - hydroxide ions are removed from the blood, preventing the pH of blood from becoming too acidic (acidosis)

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