1. Date: November 18, 2016
Aim #27: How does osmosis and diffusion compare?
HW:
Daily Review of class notes.
Unit 3 Test Tuesday 11/22 (period 5) Wednesday 11/23 (period 1)
Do Now: Answer the following multiple choice question and explain WHY the answer you chose is the best answer

2. Aim #27: How does osmosis and diffusion compare?

3. What is the diffusion of water called?
Osmosis

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

5. 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?

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

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

8. Why does this happen?

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

10. 4) What happens to a cell placed in distilled water??
When a cell is placed in a distilled water, the water diffuses into the cell, causing the cell to swell
Example: Red Blood Cell in Distilled Water

11. 5) What happens to a cell placed in salt water?
When a cell is placed in salt water, the water diffuses out of the cell, causing the cell to shrink
Example: elodea in salt water
Plants usually have 98% water and 2% dissolved materials inside of their cells. When salt is spread on roads and walkways, that balance changes. Runoff water may reach concentrations of 5% salt and 95% water. Water inside plants will then move out and plants may die.

13. Will osmosis happen?

14. In which direction will osmosis happen?

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

16. 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.

17. Amoeba Sisters: Osmosis