University:
Concordia University Texas
Course:
PHY 1401 | Physics I
Academic year:

2022
Views:

179

Pages:

2
Author:

Jonathon Barber

Diffusion and Osmosis Worksheet 1. How are the molecules moving in the examples below? Write OSMOSIS or DIFFUSION. a. The student sitting next to you just came from gym class and forgot to shower and you can tell. diffusion osmosis b. After sitting in the bathtub for hours, your fingers start t o look like prunes. c. The girl sitting two rows ahead of you put on too much perfume this morning. diffusion d. One way to get rid of slugs in your garden is to sprinkle s alt on them, so they shrivel up. osmosis e. Yum! Someth ing smells good. The neighbors are cooking on the grill! diffusion f. Gargling with salt water when you have a sore throat causes your swollen throat cells to osmosis shrink and feel better. g. Oxygen molecules move from the air sacs in the lungs across the cell membranes into the blood 2. Use arrows to indicate the dir ection of diffusion in each case below: A) B) 3. For each of the situations below use an arrow to indicate the net movement of sugar into or out of the cell. (Assume that the sugar molecules can pass through the cell membrane in each case.) 1% sugar 3% sugar 1% sugar 5% sugar 1% sugar 1% sugar 4. Diffusion always causes particles to move from a region of to a region of low high concentration concentration. no 5. Does a cell use energy when molecules diffuse in or out of the cell? ____ Why? because diffusion is passive movement of particles. And no energy is needed for it to happen Match each term on the left with the best descriptor on the right. Use each only once. 6. Concentration Descriptor a) Moves of particles like oxygen into cells A B 7. Diffusion 8. Equal amount of water inside a cell as outside b) Amount of a substance in a certain place e 9. More water outside a cell than inside g c) Moves water into and out of cells 10. Osmosis C 11. More solute outside a cell than inside f d) Allows some substances through d 12. Selectively permeable membrane e) f) g) 13. You have just bought a tropical fish for your freshwater (no salt) aquarium. Unfortunately, you do not realize it is a saltwater fish, which is isotonic to salty water environments. Using your knowledge of osmosis, explain why this fish will not survive in your aquarium. The fresh water will be hypotonic to this fish and as a result the fish will explode 14. Complete the table by writing whether solutes and water move INSIDE or OUTSIDE the cell. • Hints: With diffusion, solutes move from an ar ea of high concentration to an area of low concentration. With Osmosis, wherever more salt is, water follows! Or, water also goes from an area of high amount of water to an ar ea of low amount of water. DIFFUSION Does the SOLUTE move INSIDE or OUTSIDE the cell? OSMOSIS Does WATER move INSIDE or OUTSIDE the cell? in out none none in out out in none out none in intracellular extracellular fluid fluid (inside the cell) (outside of cell) 5% salt 10% salt 10% salt 10% salt 3% glucose 1% glucose 2% protein 1% protein 9% salt 9% salt 13% water 25% water

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