Watch a video or computer diffusion. two empty gas simulation of diffusion on BBC jars. Observe slides or or McGraw-Hill website. micrographs of villi, Activity: Role play diffusion in and alveoli, root hair cells liquids at different and leaves. McGraw-Hill Higher temperatures and Education: concentrations. Link to 4.1.1 of matter Apply particle model to diffusion. MS 4a, 4b, 4c, 4d Plot, draw and interpret appropriate graphs. 4.1.3.3 may move across Define the term 1 Set up a simple osmometer at Make predictions with ‘osmosis’. cont. cell membranes by the start of the lesson and explanations. Cellulose tubing Explain how substances osmosis. Cell measure how far the liquid in filled with are transported into and out Investigate the effect of membranes are partially the capillary tube rises during concentrated of cells through osmosis. water and concentrated permeable: they allow the lesson. sugar solution salt solution on onion/ small molecules such as attached to Explain the movement of water beetroot/ rhubarb cells. water through but not capillary tube molecules as a special type of larger molecules. During osmosis. held in clamp, diffusion through a partially osmosis water diffuses beaker of water. permeable membrane. Required practical 4: from where it is more Four beakers investigate the effect of concentrated (because Predict and explain what will (two of water and a of concentrations the solute concentration happen to cellulose tubing two of sugar of salt or sugar solutions is lower), through a bags filled with water or sugar solution); four partially permeable cellulose
Watch a video or computer simulation of diffusion on BBC or McGraw-Hill website. Role play diffusion in and liquids at different temperatures and concentrations. Link to 4.1.1 of matter Apply particle model to diffusion. MS 4a, 4b, 4c, 4d Plot, draw and interpret appropriate graphs. diffusion. Observe slides or micrographs of villi, alveoli, root hair cells and leaves. two empty gas jars. Activity: McGraw-Hill Higher Education: 4.1.3.3 cont. may move across cell membranes by osmosis. Cell membranes are partially permeable: they allow small molecules such as water through but not larger molecules. During osmosis water diffuses from where it is more concentrated (because the solute concentration is lower), through a partially permeable Define the term ‘osmosis’. Explain how substances are transported into and out of cells through osmosis. 1 Set up a simple osmometer at the start of the lesson and measure how far the liquid in the capillary tube rises during the lesson. Explain the movement of water molecules as a special type of diffusion through a partially permeable membrane. Predict and explain what will happen to cellulose tubing bags filled with water or sugar Make predictions with explanations. Investigate the effect of water and concentrated salt solution on onion/ beetroot/ rhubarb cells. osmosis. Required practical 4: investigate the effect of a of concentrations of salt or sugar solutions Cellulose tubing filled with concentrated sugar solution attached to capillary tube held in clamp, beaker of water. Four beakers (two of water and two of sugar solution); four cellulose
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