Diffusion Lab Questions AP Biology Name________________________ 1. What is Kinetic Energy? 2. How does KE differ from PE? 3. What environmental factors affect KE with respect to diffusion? 4. What are three ways in which diffusion rates can increase? a. b. c. 5. Why are most cells small? 6. Why do most cells have “undulations” in the cell membrane? 7. Water moves from areas of ___________ to ______________. 8. What would happen if you applied salt water to a plant cell? 9. How does a plant cell control internal turgor pressure? 10. What was the surface area, volume, and diffusion rate for each of the three cubes in “Procedure 1”? SA V Diffusion Rate 1 2 3 11. Summarize the results of this part of the lab. 12. Why is it important for an IV bag to have salts in it? 13. What would happen if a patient were given an IV of pure water? 14. How can you determine what substances will diffuse and in what direction? Use a drawing to help your explanation. 15. Will protein diffuse? Will it affect the diffusion of other molecules? 16. Which pairs tested did not have a change in mass? 17. If you compared 1M solutions, was a 1M NaCl solution more or less hypertonic than a 1M sucrose solution? What is your evidence? 18. What about 1M NaCl and 1M glucose + 1M sucrose? 19. How could you test the diffusion of glucose? 20. Based on what you learned from this experiment, how could you determine the solute concentration inside a living cell? 21. Procedure 3: Explain how you determined the unknown concentrations of sucrose and list your results. Unknown A Sucrose concentration (M) + observations B C D 22. What is the meaning of the word NET in the following… “In an isotonic solution there is no net movement of water and solute”?
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