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Diffusion Virtual Lab Activity Refer to the Diffusion Virtual Lab activity and answer the following questions: 1. What are three variables which influence the rate of diffusion across a semipermeable membrane? Circle the variable that was measured in this experiment. The three variables are concentration gradient, temperature, and surface area. 2. Did glucose diffuse from the dialysis tubing? How did you determine this? 3. Did starch diffuse from the dialysis tubing? How did you determine this? 4. Did iodine diffuse into the dialysis tubing? How did you determine this? 

          Diffusion Virtual Lab Activity
Refer to the Diffusion Virtual Lab activity and answer the following questions:
1. What are three variables which influence the rate of diffusion across a semipermeable
membrane? Circle the variable that was measured in this experiment.
The three variables are concentration gradient, temperature, and surface area.
2. Did glucose diffuse from the dialysis tubing? How did you determine this?
3. Did starch diffuse from the dialysis tubing? How did you determine this?
4. Did iodine diffuse into the dialysis tubing? How did you determine this?
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Diffusion Virtual Lab Activity Refer to the Diffusion Virtual Lab activity and answer the following questions: 1. What are three variables which influence the rate of diffusion across a semipermeable membrane? Circle the variable that was measured in this experiment. The three variables are concentration gradient, temperature, and surface area. 2. Did glucose diffuse from the dialysis tubing? How did you determine this? 3. Did starch diffuse from the dialysis tubing? How did you determine this? 4. Did iodine diffuse into the dialysis tubing? How did you determine this?

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Biology for AP Courses
Biology for AP Courses
Julianne Zedalis, John Eggebrecht
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Diffusion Virtual Lab Activity Refer to the Diffusion Virtual Lab activity and answer the following questions: What are three variables which influence the rate of diffusion across a semipermeable membrane? Circle the variable that was measured in this experiment. The three variables are concentration gradient, temperature, and surface area. 2. Did glucose diffuse from the dialysis tubing? How did you determine this? 3. Did starch diffuse from the dialysis tubing? How did you determine this? 4. Did iodine diffuse into the dialysis tubing? How did you determine this? Diffusion Virtual Lab Activity Refer to the Diffusion Virtual Lab activity and answer the following questions: 1. What are three variables which influence the rate of diffusion across a semipermeable membrane? Circle the variable that was measured in this experiment. The three variables are concentration gradient, temperature, and surface area. 2.Did glucose diffuse from the dialysis tubing? How did you determine this? =I 3.Did starch diffuse from the dialysis tubing? How did you determine this? 4. Did iodine diffuse into the dialysis tubing? How did you determine this?
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Virtual Dialysis Simulation 7. Did iodine diffuse into the dialysis tube? What visual evidence do you base your answer on? Yes, iodine diffused into the dialysis tube because just only the tubing bag looks dark purple. 8. Did the starch diffuse out of the dialysis tube into the beaker? How do you know? What indicator (colored molecule) helped you determine this? No, the starch didn't diffuse out of the dialysis tube into the beaker because if both iodine and starch was able to diffuse across the dialysis tube, then they would make both side turning to dark purple. 9. Did glucose diffuse out of the dialysis tube? How did you come to this conclusion? Yes, glucose diffused out of the dialysis tube because diffusion occurred base on molecular size. 10. For any of the molecules in the previous questions that did move, what was the driving force and type of transport that they needed to move?

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1. Define diffusion. 2. A glucose-starch solution was placed in dialysis tubing. Then, the tubing was placed in a cup containing IKI indicator. Did starch stay within the tubing or move out of the tubing? Did IKI indicator stay in the solution in the cup or move into the tubing? Support your answer with the observations. 3. Put the IKI solution in the cup and the contents of the dialysis tubing were tested with the glucose test strips. Did glucose stay within the dialysis tubing or move out of the tubing? Support your answer with the observations. 4. How is a cell membrane similar to the dialysis tubing used? 5. Might it be inferred that: a) starch and glucose molecules are the same size, b) starch molecules are larger than glucose molecules, or c) starch molecules are smaller than glucose molecules. Explain your answer. 6. How did hypotheses compare with outcomes? 7. What is osmosis? 8. Is osmosis a form of active or passive diffusion/transport? Why? 9. Why do intravenous (IV) solutions need to have the same tonicity as blood? 10. What occurred when blood mixed with solution? Why did this occur? 11. Is the movement of substances in this exercise active or passive?

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Experiment B: Diffusion of Molecules Through a Selectively Permeable Membrane Materials: - String or rubber band - Wax pencil - 500-mL beaker filled with one-third water - 30% glucose solution - Handheld test tube holder - Starch solution - 3 standard test tubes - I2KI solution - Disposable transfer pipettes - Benedict's reagent - 2 400-mL beakers for holding dialysis bag - Hot plate - 30-cm strip of moist dialysis tubing Exercise 3.1, Experiment B: Question: Formulate a question about the permeability of dialysis tubing. Hypothesis: Hypothesize about the selective permeability of dialysis tubing to the substances being tested (glucose, starch, and iodine potassium iodide). Prediction: Predict the results of the I2KI (iodine potassium iodide) and Benedict's test based on your hypothesis (an if/then statement).

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Transcript

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0:00 Hi.
00:01 So in this question we can see that iodine and glucose can pass through the dialyzing tube.
00:24 Dylysis tubing.
00:29 But starch molecules cannot pass because they are too large and starch is a discharide.
00:59 It starts as a dissecretide.
01:01 So it cannot pass through the membrane...
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