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Do Now Complete Do Now sheet Answer:
Two molecules, A and B, and their distribution inside and outside of a cell are represented in the diagram. State one possible reason why molecule A could diffuse across the membrane of the cell but molecule B could not. Answer: Molecule A is small enough to pass, molecule B is too big.
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Aim: How do Osmosis and Diffusion compare?
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What is the diffusion of water called?
Osmosis
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OSMOSIS The movement of water from an area of high concentration to an area of less concentration.
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What is meant by concentration?
The amount of solute! Solvent: The liquid (ex. Water) Solute: The solid added to the liquid (ex. Salt/sugar) Distilled water 100% pure water
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Concentration Differences:
1) A 90% salt solution vs. a 20% salt solution Which solution has more salt particles? Which solution has more water molecules? 2) A 60% salt solution vs. 80% salt solution?
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Which container has a greater concentration of water molecules?
= Solute (salt) = Solvent (water) Which container has a greater concentration of solute molecules?
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In which direction is osmosis going to occur?
= Solute (sugar) = Solvent (water) Selectively Permeable
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Why does this happen?
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Why are the water molecules diffusing to the left?
Water molecules are red
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The water is moving from an area of high to low!
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Why does water go in and out of the cell?
If solute is equal, then so is water amt., molecules still move back and forth! To maintain DYNAMIC EQUILIBRIUM
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What happens to an animal cell if it is surrounded by a low concentration of water?
The Cell will shrink!! Salt sucks!!!!
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Practice Questions 1. A cell containing 98% water in its cytoplasm is placed in a 20% salt solution. What will happen to the cell? 2. What will happen to a cell if it is placed into a concentrated salt solution? 3. What will happen if a cell is placed in distilled water?
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In which direction will osmosis happen?
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How is osmosis a form of passive transport?
Osmosis is the movement of water from an area of high concentration to an area of low concentration. No ATP needed.
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