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Introduction to Diffusion and Osmosis

Introduction to Diffusion and Osmosis. “Size does matter”. Solution. A solution is where one substance (solute) is dissolved in another substance (solvent). May be a solid dissolved in a liquid, a liquid dissolved in a liquid, or a gas dissolved in a gas

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Introduction to Diffusion and Osmosis

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  1. Introduction to Diffusion and Osmosis “Size does matter”

  2. Solution • A solution is where one substance (solute) is dissolved in another substance (solvent). • May be a solid dissolved in a liquid, a liquid dissolved in a liquid, or a gas dissolved in a gas • The goal of any solution is to get to equilibrium – where the solute is dissolved evenly in the solvent.

  3. Diffusion • The movement of molecules in an effort to get to equilibrium. • Requires no extra energy. • Examples: • Food Coloring in Water • Sugar in Iced Tea • Air freshener in the air • How diffusion works.

  4. Cell Membrane • Controls what can move into or out of a cell. • This is determined by size. • Big molecules cannot get through the cell membrane, but smaller ones can. Starch, proteins, nucleic acids cannot Some glucose, water, small ions like I+ can go through

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