The document defines osmosis as the diffusion of water across a membrane from an area of lower solute concentration to higher solute concentration. It explains that solutions can be isotonic when solute concentrations inside and outside the cell are equal, hypotonic when outside is lower causing water to flow into the cell, or hypertonic when outside is higher causing water to flow out of the cell. Examples are given of pure water, ocean water, and a diagram is provided to determine if a solution is iso, hypo, or hypertonic based on solute concentrations and direction of water flow.

1. Osmosis Notes (page 10)

2. Osmosis Notes (page 10)
• Diffusion = movement of particles from an
area of high concentration to an area of low
concentration

3. Osmosis Notes (page 10)
• Diffusion = movement of particles from an
area of high concentration to an area of low
concentration
• Osmosis = The diffusion of water

4. • Note: [ ] = Concentration

5. • Note: [ ] = Concentration
• [Solute] + [Water] = 100%

6. • Note: [ ] = Concentration
• [Solute] + [Water] = 100%
• Example:
– Pure water: 0% solute, 100% water
– Ocean water: 3% solute, 97% water

7. Types of solutions
• Isotonic: [Solutes] in solution = [Solutes] in cell

8. Types of solutions
• Isotonic: [Solutes] in solution = [Solutes] in cell
• Hypotonic: [Solutes] in solution < [Solutes] in cell
Water flows IN to cell

9. Types of solutions
• Isotonic: [Solutes] in solution = [Solutes] in cell
• Hypotonic: [Solutes] in solution < [Solutes] in cell
Water flows IN to cell
• Hypertonic: [Solutes] in solution > [Solutes] in cell
Water flows OUT of cell

10. Output (page 11)
• Draw the following diagram and then answer the
questions
Solution
10% solute
90 % water
W
Cell
2% solute
98% water
• Is the solution iso, hypo, or hypertonic?
• Draw an arrow showing the direction the water will
flow
• Will the cell shrink, swell, or stay the same size?

11. Egg Demo (pg 11)