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Diffusion And Osmosis
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Diffusion And Osmosis

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  • 1. Diffusion and Osmosis
  • 2. Diffusion
    • Particles in a liquid or gas spread out…
    • … from regions of high concentration…
    • … to regions of low concentration…
    • … until the particles are evenly spread out.
    Dissolving KMnO 4 crystal
  • 3.
    • The difference between the regions of high concentration and low concentration is called the concentration gradient
    • The steeper the concentration gradient, the faster diffusion takes place
    High concentration gradient Fast rate of diffusion Low concentration gradient Slow rate of diffusion
  • 4.
    • Diffusion occurs because the particles in gases and liquids are moving.
  • 5. Dissolving substances in water
    • The molecules in liquid water are constantly moving
    • When water molecules bump into particles of a soluble substance, they stick to them
    Free moving water molecules Sugar molecules in sugar lump
  • 6.
    • When the water molecules move away…
    … they carry particles of the solute with them
  • 7. Partially-Permeable Membranes
    • A partially-permeable membrane will allow certain molecules to pass through it, but not others.
    • Generally, small particles can pass through…
    Partially permeable membrane … but large particles cannot
  • 8. More free water molecules on this side of membrane Free water molecules diffuse in this direction Partially-permeable membrane Water-solute particle is too large to pass through membrane
  • 9. Osmosis
    • Osmosis is the diffusion of free water molecules…
    • … from a region of high concentration of free water molecules…
    • … to a region of low concentration of free water molecules…
    • … across a partially-permeable membrane …
    • … until they are evenly spread out.