Biology Block_______ Name____________________________________
Dr. Wexler
Quiz: Osmosis
Date________

1. Draw and label a diagram of the osmosis experiment you performed using dialysis membrane:

2. What did you observe after the dialysis bags sat overnight?

3. Carefully explain this result in terms of the osmosis concept.

4. Diffusion involves the movement of molecules from one place to another. In general, what determines the direction of this movement?

5. What is the difference, if any, between diffusion and osmosis?

6. What is a semi-permeable membrane?

7. Which is able to diffuse through a semi-permeable membrane: free water or bound water?

8. Give two examples of substances used in our lab that bind water:

A.

B.

9. Describe a way to create a difference in free water concentration between two regions separated by a semi-permeable membrane: