1. Drill 1.3.11 1- What is diffusion? 2- What is the difference between a solute and solvent? 3- 50 g of sodium chloride is dissolved in water. Identify the solute and the solvent. 4- How is concentration related to the way a solute moves? That is, in what direction does a solute move?

2. Moving Moving Molecules! Passive transport = NO ENERGY – Molecules are moving from _______ concentration to _______ concentration Active transport = NEEDS ENERGY – Molecules are moving from _______ concentration to _______ concentration

3. Passive Transport No energy!!!! Diffusion = MOVEMENT OF SOLUTE Osmosis = MOVEMENT OF WATER

4. Diffusion Movement of solute from ______ to ______ concentration At what point does diffusion stop?

5. Examples of diffusion Perfume Making tea Someone smoking a cigarette How might diffusion explain why a helium balloon deflates slowly over time?

6. Simple and Facilitated Diffusion

8. Osmosis Movement of water from ______ concentration to ______ concentration This is different from diffusion! How?

9. Let’s think about this Osmosis involves the movement of water – **across a semi-permeable membrane** Water moves from high to low water concentration – Moves from low to high solute concentration

10. Examples of osmosis Why your lips dry out when you eat salty foods! Plants (and plant cells) becoming rigid How your kidneys work! Water intoxication syndrome (not good)

11. 1. Animal cell2. Animal cell 3. Animal cells4. Plant cell

12. Red blood cells and Osmosis

13. Homework Passive transport worksheet – Know the difference between solute and solvent Describe how solutes move – Know the difference between simple diffusion and facilitated diffusion – Know the difference between diffusion and osmosis Describe how water moves

14. Tomorrow: Egg lab!! 4 days of observations and fun!