Diffusion

• 1)Using a knife and ruler, create a cube and a cuboid of agar jelly with the same volume but varying surface areas
• 2)Fill a beaker with hydrochloric acid so you can completely submerge the jelly
• 3)Place both shapes in the hydrochloric acid and immediately start the timer
• Independent variable: Surface area

  Dependant variable: Time taken

  Control: Amount of hydrochloric acid
• Hazard: Hydrochloric acid is corrosive and can cause severe burns
• A concentration gradient is the difference in concentration between two areas. If the difference is large, diffusion occurs faster.
• A smaller molecule has greater mobility therefore diffusions occurs quicker
• An increased temperature means the molecules have greater energy so they move faster therefore diffusion occurs quicker