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Osmosis & Diffusion Packet #8 Sections 7.3 & 36.1.

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Presentation on theme: "Osmosis & Diffusion Packet #8 Sections 7.3 & 36.1."— Presentation transcript:

1 Osmosis & Diffusion Packet #8 Sections 7.3 & 36.1

2 Diffusion

3 Introduction {Figure 7.11}
What causes diffusion? How does one define diffusion?

4 Rate of Diffusion… What are the four factors that impact the rate of diffusion?

5 Categories of Diffusion I
List and describe three categories of diffusion. Which of the three categories require the passage of particles through channels? Which of the three categories require the use of energy?

6 Osmosis Special Case of Diffusion

7 Osmosis {Figure 7.12} Provide a definition for osmosis.
Friday, November 16, 2018Friday, November 16, 2018 Provide a definition for osmosis. How could one explain the cause of lowering of water levels if a potato was placed in a cup of water?

8 Osmotic Pressure, Osmotic Potential & Solute Potential

9 Osmotic Pressure Why is osmotic pressure important?
Friday, November 16, 2018Friday, November 16, 2018 Why is osmotic pressure important? Use students to illustrate the differences in pressure. Five on side A and 2 on side B—most pressure going forward will be on side A giving a net pressure as the water moves from side A to side B. If a solution is separated from pure water by a semi-permeable membrane, the pressure which must be applied to prevent osmosis is called the osmotic pressure

10 Osmotic Potential = Osmotic Pressure
Friday, November 16, 2018Friday, November 16, 2018 What is osmotic potential? What numerical value should osmotic potential have?

11 Osmotic Potential = Osmotic Pressure = Solute Potential
Friday, November 16, 2018Friday, November 16, 2018 What is the relationship between the number of solutes and solute potential?

12 Osmotic Potential = Osmotic Pressure = Solute Potential
Friday, November 16, 2018Friday, November 16, 2018 What is the connection between osmotic potential, osmotic pressure and solute potential? What is used to represent all three variables?

13 Osmotic Potential = Osmotic Pressure = Solute Potential
Friday, November 16, 2018Friday, November 16, 2018 Why do isotonic, hypertonic and hypotonic solutions exist?

14 Pressure Potential {Figure 36.5}
Friday, November 16, 2018Friday, November 16, 2018 What is the cause of pressure potential? Is pressure potential and osmotic pressure the same? Why or why not?

15 Water Potential How is water potential calculated?
Friday, November 16, 2018Friday, November 16, 2018 How is water potential calculated?

16 Water Potential II Friday, November 16, 2018Friday, November 16, 2018 What is the relationship between water potential and osmosis?

17 Friday, November 16, 2018 Cells and Osmosis

18 Pressure Potential in Plant Cells
Friday, November 16, 2018Friday, November 16, 2018 What causes positive pressure potential in plant cells? A plant cell can be considered as a solution of salts and sugars in the vacuole surrounded by a semi-permeable membrane

19 Pressure Potential in Plant Cells II
Friday, November 16, 2018Friday, November 16, 2018 What causes negative pressure potential in plant cells?

20 Cells & Osmosis {Figure 36.6}
Friday, November 16, 2018Friday, November 16, 2018

21 Cells & Osmosis {Figure 7.14}
Friday, November 16, 2018Friday, November 16, 2018

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