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Date: November 24, 2015
Aim #30: How does osmosis and diffusion compare?
HW: 1) Cell Web Quest due Tuesday 12/1 2) QUIZ- Tuesday/Wednesday (Aim #’s 24-26)3) Unit 3 Test- Monday (12/7)/Tuesday (12/8)
Do Now: Warm-Up NotebookDate Title of Activity Page #11/24 Cellular Transport 2 53
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Date: November 25, 2015
Aim #30: How does osmosis and diffusion compare?
HW: 1) Cell Web Quest due Tuesday 12/1 2) Microscope Lab due next week!3) Unit 3 Test- Monday (12/7)/Tuesday (12/8)
Do Now: Warm-Up NotebookDate Title of Activity Page #11/25 Plant vs. Animal Cells 54
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Aim #30: How does osmosis and diffusion compare?
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What is the diffusion of water
called?
Osmosis
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What is meant by concentration?
Distilled water100% pure water
What happens when we add a SOLUTE like salt or sugar?
Solvent: The liquid (ex. Water)
Solute: The solid added to the liquid (salt/sugar)
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3) Concentration Differences:
a) A 90% salt solution vs. a 20% salt solution
i. Which solution has more salt particles?
ii. Which solution has more water molecules?
b) A 60% salt solution vs. 80% salt solution?
i. Which solution has more salt particles?
ii. Which solution has more water molecules?
90% Salt Solution
20% Salt Solution
80% Salt Solution
60% 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 ofsolute 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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4) What is a hypotonic solution?
• Contain a low concentration of solute relative to another solution (e.g. the cell's cytoplasm)
• When a cell is placed in a hypotonic solution, the water diffuses into the cell, causing the cell to swell
• Example: Red Blood Cell in Distilled Water
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5) What is an isotonic solution?
• Contain the same concentration of solute as an another solution (e.g. the cell's cytoplasm)
• When a cell is placed in an isotonic solution, the water diffuses into and out of the cell at the same rate
• Example: The fluid that surrounds the body cells
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6) What is a hypertonic solution?
• Contain a high concentration of solute relative to another solution (e.g. the cell's cytoplasm)
• When a cell is placed in a hypertonic solution, the water diffuses out of the cell, causing the cell to shrink
• Example: elodea in salt water
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Will osmosis happen?
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In which direction will osmosis happen?
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What was in the solution that made this happen to the cells?
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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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Amoeba Sisters Video (9:27)https://www.youtube.com/watch?v=IaZ8MtF3C6M