2 Which of the following occurs when a hypertonic solution is added to cells

2 which of the following occurs when a hypertonic

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2. Which of the following occurs when a hypertonic solution is added to cells? You correctly answered: d. The cells shrink. 3. The variable that affects osmotic pressure is You correctly answered: a. the concentration of nondiffusing solutes. 4. The net movement of water would be into the cell in a You correctly answered: b. hypotonic solution. 09/13/18 page 1
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09/13/18 page 2 Experiment Results Predict Question: Predict Question 1: What effect do you think increasing the Na+ Cl- concentration will have? Your answer : b. decreased osmotic pressure Predict Question 2: What do you think will be the pressure result of the current experimental conditions? Your answer : b. pressure above the right beaker Stop & Think Questions: Why do you think there is no pressure change? You correctly answered: b. Sodium is able to diffuse through the pores. Why do you think there was no pressure change? You correctly answered: c. There is no net movement of water because the solute concentrations are the same. Experiment Data: Run Number Solute MWCO Start Conc. L Pres. L Start Conc. R Pres. R Rate 1 Na+ Cl- 20 5.00 170 0.00 0 0.0000 1 Albumin 20 0.00 170 0.00 0 0.0000 1 Glucose 20 0.00 170 0.00 0 0.0000 2 Na+ Cl- 20 10.00 340 0.00 0 0.0000 2 Albumin 20 0.00 340 0.00 0 0.0000 2 Glucose 20 0.00 340 0.00 0 0.0000 3 Na+ Cl- 50 10.00 0 0.00 0 0.0167 3 Albumin 50 0.00 0 0.00 0 0.0000 3 Glucose 50 0.00 0 0.00 0 0.0000 4 Na+ Cl- 100 0.00 136 0.00 0 0.0000 4 Albumin 100 0.00 136 0.00 0 0.0000 4 Glucose 100 8.00 136 0.00 0 0.0000 5 Na+ Cl- 100 0.00 0 0.00 0 0.0000 5 Albumin 100 0.00 0 0.00 0 0.0000 5 Glucose 100 8.00 0 8.00 0 0.0000 6 Na+ Cl- 200 0.00 0 0.00 0 0.0000 6 Albumin 200 0.00 0 0.00 0 0.0000 6 Glucose 200 8.00 0 0.00 0 0.0036 7 Na+ Cl- 200 0.00 153 0.00 0 0.0000 7 Albumin 200 9.00 153 0.00 0 0.0000 7 Glucose 200 0.00 153 10.00 0 0.0044
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09/13/18 page 3 Post-lab Quiz Results You scored 100% by answering 4 out of 4 questions correctly. 1. If you double the concentration of a nondiffusible solute that is on one side of a membrane, the osmotic pressure will You correctly answered: c. double. 2. Which membrane did not allow Na+ Cl- to pass through? You correctly answered: a. 20 MWCO 3. When a solute is able to diffuse through a membrane You correctly answered: b. equilibrium is reached. 4. Water diffuses You correctly answered: c. toward solutes.
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09/13/18 page 4 Review Sheet Results 1. Explain the effect that increasing the Na+ Cl- concentration had on osmotic pressure and why it has this effect. How well did the results compare with your prediction? Your answer: The results did not agree with my prediction because increasing the NA+CL-concentration increased the osmotic pressure. Solutes draw water toward them because of this a high concentration will create a higher pressure. When the concentration is increased the pressure needed to diffuse the water is also higher. 2. Describe one way in which osmosis is similar to simple diffusion and one way in which it is different. Your answer: One way that osmosis is similar to simple diffusion is that they are both passive processes. One way that they are different is that osmosis is only for the movement of water. Simple diffusion is not necessarily water, it could involve other solutes besides water. 3. Solutes are sometimes measured in milliosmoles. Explain the statement, “Water chases milliosmoles.” Your answer: The statement "water chases milliosmoles" means that water moves toward high solute concentrations. So the higher the concentration the water will follow where the millosmoles are the highest.
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