Drill 1.3.11

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 cell 2. Animal cell 3. Animal cells 4. 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!