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Diffusion through a liquid




Diffusion Name;As you complete the lab, answer the questions below, when completed save with your name and then attach to the Lab 6 drop box.;Experiment 1: Diffusion through a liquid;1. A concentration gradient affects the direction that solutes diffusion. Describe how a molecules move with respect to the concentration.;2. How does the size of a solute affect the rate of diffusion? Consider the size and shape of a molecule in your response.;3. Does polarity affect the rate of diffusion? Explain your answer using scientific principles.;4. After completing experiment 1, fill out the tables below and answer the questions following;Table 1: Diffusion Through Liquids;Corn Syrup in mm;Time (sec) Blue Dye;mm Red Dye;mm;10;20;30;40;50;60;70;80;90;100;110;120;Table 2: Diffusion Rate of Dyes in Corn Syrup;Dye Name Molecular Weight Total Distance Traveled (mm) Speed of Diffusion (mm/hr)*;Blue Dye;Red Dye;1. Record your hypothesis from Step 3 here. Be sure to validate your predictions with scientific reasoning.;2. Which dye diffused the fastest?;3. Does the rate of diffusion correspond with the molecular weight of the dye?;4. Does the rate of diffusion change over time? Why or why not?;5. Make your own line graph using your data and insert as.jpg in your report here.;6. Explain the role diffusion plays in this process of getting oxygen to your cells of the human body.;Experiment 2: Concentration gradients and membrane permeability;Table 3: Indicator Reagent Data;Starch + Conrol (color) Starch Negative Control (color) Glucose +;Control (color) Glucose Negative;Control (color);IKI Solution N/A N/A;Glucose Test Strip N/A N/A;Table 4: Glucose Diffusion;Dialysis Bag after 60 minutes Beaker water after 60 minutes;IKI Solution;Glucose Test Strip;Experiment 2;Do experiment on Lab 6, Diffusion;Questions;1. Why is it necessary to have positive and negative controls in this experiment?;2. Include a picture of you and your experimental set-up here;3. Which substance crossed the dialysis membrane? What evidence from your results proves this?;4. What molecules remained inside of the dialysis bag?;5. Of the substances that diffused through the bag, did all of the molecules diffuse out? Explain.;6. Is the bag hypotonic with regards to the IKI solution, or the beaker? What about the starch solution?;7. What results would you expect if the experiment started with glucose and Lugol?s Solution inside of the bag, and starch and water in the beaker? Why?;8. Draw a diagram of this set up. Use arrows to depict the movement of each substance in the dialysis bag and the beaker.;9. What type of membrane does the dialysis tubing represent? Give an example of this type of membrane that can be found inside the body.;10. How does the glucose concentration affect diffusion rate?


Paper#15081 | Written in 18-Jul-2015

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