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  • Created by: alexda
  • Created on: 12-01-15 20:38
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  • Osmosis
    • Osmosis is the passive movement of water molecules from an area of higher water concentration to an area of lower water concentration through a partially permeable membrane.
      • A partially permeable membrane is one with very small pores in it. Only small molecules like water can pass through the holes, whereas bigger molecules such as sucrose can not.
    • Osmosis can happen in either direction across a partially permeable membrane, because the molecules move at random all the time.
    • There will be a net movement of water molecules in one direction at a time, so the water molecules will diffuse from a less concentrated solution to a more concentrated solution.
      • This particularly affects sucrose solutions as with added water molecules the solutions become more dilute.
      • i.e. The water molecules will diffuse from the higher concentration of water molecules to a lower concentration of water molecules.


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