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1.3 Osmosis and Diffusion

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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1.3 Osmosis and Diffusion

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  1. 1.3 Osmosis and Diffusion

  2. 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

  3. 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

  4. 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

  5. Your Turn • Questions P. 49 #1-12 • Make sure your lab write up is handed in

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