Diffusions and Osmosis



Diffusion and Osmosis

Directions: Go to the url “”. When you have gone there, look for the box labeled “Find a Track”. Type in the “View Track #” the following number: 300661. Click “Go”. Click on the “View in Text” button to begin the assignment. After you are finished with each page, click back on your browser to view the list of links again. Feel free to explore all the information sites, however, you will only be responsible for the material on this handout.

Website 1: Diffusion

1. What is diffusion?

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How might this explain why when someone farts, the smell eventually goes away? Use your own thoughts to answer the question; you will not find it on the webpage.

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2. At the beginning of the animation and at the end, molecules are in a state of equilibrium. Based on what you see, how would you describe “equilibrium.”

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3. Do you think that, when the molecules are evenly spread throughout a space, they no longer continue to move throughout that space?

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Website 2: Osmosis Animation

1. What is osmosis?

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2. How is osmosis different from diffusion?

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3. Why is water able to diffuse across a membrane, but not other molecules?

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4. Why does water move into the side with urea molecules?

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Website 3: Cell Osmosis Animations

1. Click on the next website, “Cell Osmosis Animations”. Then, Click on the play button on the lower left side of the picture. Based on what you now know about osmosis, what do you think the red and white molecules represent shown about 20% through the video?

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2. What do you think the large teal molecules represent shown about 33% through the video?

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3. What happened to the urea molecules compared to the water molecules in the video?

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Website 4 and 5: Isotonic, Hypertonic, and Hypotonic Animations

Define the following terms and explain what happens to a cell in each environment:

Water Concentration High Inside (Hypertonic): ____________________________________ ___________________________________________________________________________

Water Concentration High Outside (Hypotonic): ___________________________________ ___________________________________________________________________________

Water Concentration Equal on Both Sides (Isotonic): ________________________________ ___________________________________________________________________________

Website 6: Isotonic, Hypertonic, and Hypotonic Self-Quiz

1. Click on the next website, “Isotonic, Hypertonic, and Hypotonic Self-Quiz”. Take the self-quiz to quiz yourself on how hypertonic, hypotonic, and isotonic solutions can affect the bag. Remember that the contents inside the bag are hypertonic/hypotonic/isotonic solutions. Draw the pictures of the correct answers in order and explain why we would expect this to happen using the concepts of osmosis.

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Explanation:_________ Explanation:__________ Explanation:__________

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