topic 1 - osmosis

• osmosis is the movement of water particles across a partially permeable membrane from a high concentration to low concentration of water
• a partially permable membrane is one that allows small molecules to pass through the holes in it
• the stronger sugar gets more diluted
• practical - 1.cut up a potato into identical cylinders and get the beaker with different solutions.

  2.measure the mass of the cylinder,leave one cylinder in each beaker

  3.take them out and dry them, remeasure their mass

  (if water has been drawn in ,the mass will increase, if water has been drawn out, the mass will decrease)

  4.dependant variable - the potato mass

  independant - the concentration

  control - volume of solution, time, type of sugar

  5. errors will occur if not done correctly such as their will be a higher mass if potato's weren't fully dry