diffusion, osmosis, active transport

• diffusion- movement of particles from an area of HIGH concentration to a LOW concentration

  • requires no energy.
  • rate can be increased by: difference in concentration, surface area, temperature
• osmosis- diffusion of water particles across a partially permeable membrane

  Practical- weigh + place identical cylinder from potato in sugar solution of varying concentration

  after set time remove water +reweigh

  change n mass=final - initial mass/initial mass x100
• active transport- movement of particles through a membrane via carrier proteins this requires energy can move them against concentration gradient