1 3 osmosis and diffusion
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1.3 Osmosis and Diffusion

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1.3 Osmosis and Diffusion. Diffusion, Osmosis, and the Cell Membrane. Diffusion – is the movement of particles from an area of higher concentration to an area of lower concentration (Ex. Perfume) Concentration – the amount of a substance in a given space

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diffusion osmosis and the cell membrane
Diffusion, Osmosis, and the Cell Membrane
  • Diffusion – is the movement of particles from an area of higher concentration to an area of lower concentration (Ex. Perfume)
  • Concentration – the amount of a substance in a given space
  • Osmosis – is the movement of water from an area of higher concentration to an area of lower concentration (Ex. Limp carrot in water) through a selectively permeable membrane
movement across a membrane
Movement across a Membrane
  • Cell membrane is selectively permeable = only some things in
  • Cell membrane can be compared to a coffee filter
  • Diffusion is one way that particles move across the cell membrane
  • If one side of the membrane has a higher concentration of particles they will move across the membrane until both sides have the same amount = this means an equilibrium is reached
  • Particles will continue to move back and forth but there will be the same number on either side
  • Example: oxygen in our cells lungs to the blood cells
reverse osmosis
Reverse Osmosis
  • Reverse Osmosis – movement of water from a high to a low concentration – backwards – this requires pressure to push the molecules
  • Used for filtering water, purifying maple syrup and juice, and treating sewage
your turn
Your Turn
  • Questions P. 49 #1-12
  • Make sure your lab write up is handed in
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