Understanding Cell Responses to Saline Solutions

1. Bellwork 11-5-16 What will most likely occur when a cell is placed into a saline solution that has a higher salt concentration than inside the cell? A) Water molecules will move into the cell. B) Salt molecules will move out of the cell. C) Salt molecules will move until the salt concentration is the same inside and outside of the cell. D) Water molecules will move until the salt concentration is the same inside and outside of the cell.

2. Bellwork review • What will most likely occur when a cell is placed into a saline solution that has a higher salt concentration than inside the cell? • A Water molecules will move into the cell. – incorrect, there is a higher concentration of water inside of the cell so water will not move into the cell. • B Salt molecules will move out of the cell.-incorrect, water will move not the salt. • C Salt molecules will move until the salt concentration is the same inside and outside of the cell.- incorrect, water will move not the salt. • D Water molecules will move until the salt concentration is the same inside and outside of the cell.-CORRECT, water will move out of the cell until equilibrium is reach.

3. objectives • Students will be able to analyze how plant and animal cells are organized to carry on the processes of life. ​ • SPI 7.1.5 Explain how materials move through simple diffusion. ​ • Success Criteria: I can explain simple diffusion and osmosis.  ​

4. TOCDiffusion Gallery Walk REview • You will work with your group to correctly answer and EXPLAIN your answer for each question. • You will have 1 minute and 30 seconds at each question. • Use the whiteboards at each lab table to draw a picture if you need help visualizing!!

5. Question 1 A cell has a large concentration of salt molecules inside of the cell and a small concentration of salt molecules outside of the cell. Which of the following is most likely to happen to this cell? A Water molecules will diffuse out of the cell B Water molecules will diffuse into the cell C Salt molecules will diffuse out of the cell D Salt molecules will diffuse into the cell

6. Question 1 A cell has a large concentration of salt molecules inside of the cell and a small concentration of salt molecules outside of the cell. Which of the following is most likely to happen to this cell? A Water molecules will diffuse out of the cell B Water molecules will diffuse into the cell C Salt molecules will diffuse out of the cell D Salt molecules will diffuse into the cell

7. Question 2 Students placed a plastic bag containing a corn starch solution into a highly concentrated solution of iodine. The bag is permeable to iodine but not to water. If the concentration of iodine in the solution is greater than inside the bag, which of these is most likely to occur? A Iodine will diffuse through the bag into the corn starch solution. B Corn starch will diffuse through the bag into the iodine solution. C The iodine solution will dissolve the bag. D Water will diffuse through the bag causing the bag to expand.

8. Question 2 Students placed a plastic bag containing a corn starch solution into a highly concentrated solution of iodine. The bag is permeable to iodine but not to water. If the concentration of iodine in the solution is greater than inside the bag, which of these is most likely to occur? A Iodine will diffuse through the bag into the corn starch solution. B Corn starch will diffuse through the bag into the iodine solution. C The iodine solution will dissolve the bag. D Water will diffuse through the bag causing the bag to expand.

9. Question 3 The diagram below shows a container divided into two compartments by a membrane permeable to water but not to starch. Two solutions containing different concentrations of dissolved starch were placed on each side of the membrane. Which of the following describes what will happen to the water level during the process of osmosis? A The water level on both sides of the membrane will decrease. B The water level on the right side of the membrane will increase. C The water level on the left side of the membrane will increase. D The water level on both sides of the membrane will stay the same.

10. Question 3 The diagram below shows a container divided into two compartments by a membrane permeable to water but not to starch. Two solutions containing different concentrations of dissolved starch were placed on each side of the membrane. Which of the following describes what will happen to the water level during the process of osmosis? A The water level on both sides of the membrane will decrease. B The water level on the right side of the membrane will increase. C The water level on the left side of the membrane will increase. D The water level on both sides of the membrane will stay the same.

11. Question 4 An animal cell placed in a sugar solution is shown in the diagram below. Which statement best describes how osmosis will affect this animal cell? A Water will move out of the cell and the cell will shrink. B Water will move into the cell and the cell will expand. C Sugar will move out of the cell and the cell will expand. D Sugar will move into the cell and the cell will expand.

12. Question 4 An animal cell placed in a sugar solution is shown in the diagram below. Which statement best describes how osmosis will affect this animal cell? A Water will move out of the cell and the cell will shrink. B Water will move into the cell and the cell will expand. C Sugar will move out of the cell and the cell will expand. D Sugar will move into the cell and the cell will expand.

13. Question 5 The picture below shows a cell undergoing diffusion. Which of the following is most likely to happen to this cell? A Water molecules will diffuse out of the cell B Water molecules will diffuse into the cell C Corn syrup molecules will diffuse out of the cell D Corn syrup molecules will diffuse into the cell

14. Question 5 The picture below shows a cell undergoing diffusion. Which of the following is most likely to happen to this cell? A Water molecules will diffuse out of the cell B Water molecules will diffuse into the cell C Corn syrup molecules will diffuse out of the cell D Corn syrup molecules will diffuse into the cell

15. Question 6 • The diagrams below show the concentration of carbon dioxide particles inside and outside a cell. In which of these cells would the particles most likely flow into the cell?

16. Question 6 • The diagrams below show the concentration of carbon dioxide particles inside and outside a cell. In which of these cells would the particles most likely flow into the cell? B

17. Question 7 Which of these will most likely happen when the concentration of oxygen particles inside a cell is greater than the concentration of oxygen particles outside the cell? A Through diffusion, oxygen particles will move from the inside to the outside of the cell. B Through diffusion, oxygen particles will move from the outside to the inside of the cell. C Through osmosis, water particles will move from the inside to the outside of the cell. D Oxygen particles will not move from the inside or the outside of the cell.

18. Question 7 Which of these will most likely happen when the concentration of oxygen particles inside a cell is greater than the concentration of oxygen particles outside the cell? A Through diffusion, oxygen particles will move from the inside to the outside of the cell. B Through diffusion, oxygen particles will move from the outside to the inside of the cell. C Through osmosis, water particles will move from the inside to the outside of the cell. D Oxygen particles will not move from the inside or the outside of the cell.

19. Question 8 The diagram below shows the semipermeable membrane of a cell and the concentration of solutions inside and outside the cell. Which of the following statements best describes how the molecules will move? A Water molecules will move out of the cell. B Water molecules will move into the cell. C Solute molecules and water molecules will move out of the cell. D Solute molecules and water molecules will move into the cell.

20. Question 8 The diagram below shows the semipermeable membrane of a cell and the concentration of solutions inside and outside the cell. Which of the following statements best describes how the molecules will move? A Water molecules will move out of the cell. B Water molecules will move into the cell. C Solute molecules and water molecules will move out of the cell. D Solute molecules and water molecules will move into the cell.

21. EXit Ticket • Finish your egg diffusion drawing if you have not finished that yet. • What are any questions you have remaining about diffuion and osmosis.