1. Aim #30: How does osmosis and diffusion compare?
Date: November 24, 2015
Aim #30: How does osmosis and diffusion compare?
HW:
Cell Web Quest due Tuesday 12/1
QUIZ- Tuesday/Wednesday (Aim #’s 24-26)
Unit 3 Test- Monday (12/7)/Tuesday (12/8)
Do Now: Warm-Up Notebook
Date Title of Activity Page #
11/24 Cellular Transport 2 53

2. Aim #30: How does osmosis and diffusion compare?
Date: November 25, 2015
Aim #30: How does osmosis and diffusion compare?
HW:
Cell Web Quest due Tuesday 12/1
Microscope Lab due next week!
Unit 3 Test- Monday (12/7)/Tuesday (12/8)
Do Now: Warm-Up Notebook
Date Title of Activity Page #
11/25 Plant vs. Animal Cells 54

3. Aim #30: How does osmosis and diffusion compare?

4. What is the diffusion of water called?
Osmosis

5. What is meant by concentration?
Solvent: The liquid (ex. Water)
Solute: The solid added to the liquid (salt/sugar)
Distilled water
100% pure water
What happens when we add a SOLUTE like salt or sugar?

6. 3) Concentration Differences:
a) A 90% salt solution vs. a 20% salt solution
90% Salt Solution
i. Which solution has more salt particles?
20% Salt Solution
ii. Which solution has more water molecules?
b) A 60% salt solution vs. 80% salt solution?
80% Salt Solution
i. Which solution has more salt particles?
60% Salt Solution
ii. Which solution has more water molecules?

7. Which container has a greater concentration of water molecules?
= Solute (salt)
= Solvent (water)
Which container has a greater concentration of
solute molecules?

8. In which direction is osmosis going to occur?
= Solute (sugar)
= Solvent (water)
Selectively Permeable

9. Why does this happen?

10. Why are the water molecules diffusing to the left?
Water molecules are red

11. 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

12. 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

13. 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

15. Will osmosis happen?

16. In which direction will osmosis happen?

18. What was in the solution that made this happen to the cells?

19. 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.

20. Amoeba Sisters Video (9:27) https://www. youtube. com/watch