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Do Now

Do Now. What is osmosis? What happened when we put our gummi bears into water? WHY did this happen?. Objectives. To understand what happens during osmosis in regards to osmotic pressure. To compare and contrast hypertonic, hypotonic, and isotonic solutions.

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Do Now

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  1. Do Now • What is osmosis? • What happened when we put our gummi bears into water? • WHY did this happen?

  2. Objectives • To understand what happens during osmosis in regards to osmotic pressure. • To compare and contrast hypertonic, hypotonic, and isotonic solutions. • To explain different real life applications of these solutions.

  3. Osmotic Pressure • What is osmosis? • Whichever has MORE water (either the solution or the solution inside the cell) is going to be the one to have a higher osmotic pressure and the water will flow in the direction of lower osmotic pressure.

  4. “Tonicity” • The measure of osmotic pressure • There are 3 types of solutions in regards to tonicity • Isotonic • Hypertonic • Hypotonic

  5. Quick Refresher! • What is a solution? • Solute vs. solvent? • Example?-

  6. Isotonic Solutions • Same amount of solute outside the membrane as there is inside. • Effect: NOTHING  Blood Cell Plant Cell 11,397x

  7. Hypertonic Solutions • Solution contains MORE SOLUTE than the cell, water flows out of the cell. • Effect: cell shrinks/shrivels  “Plasmolysis” “Crenates”

  8. Hypotonic Solutions • Solution contains LESS SOLUTE than the cell, water flows into the cell. • Effect: cell swells or bursts! / • (remember the grocery store misters?)

  9. Animations • http://www.biologyjunction.com/tonicity%20animations.htm

  10. H2O H2O H2O H2O H2O H2O High or low Solute? Cell in ________ Solution Cell in ________ Solution Cell in ________ Solution

  11. Real Life Application • Turn to the person sitting next to you. In the next few slides you will see real life scenarios using the 3 types of solutions we have discussed. For each scenario you and your partner should determine what type of solution is being described as well as what will happen.

  12. What type of solution is the freshwater? What is going to happen to the cells of the fish? Scenario 1 A salt water fish is put into a freshwater aquarium.

  13. What type of solution is in the IV? What is going to happen to the cells of the human? Scenario 2 A patient is given an IV, which contains the perfect balance of glucose

  14. What type of solution is this salt? What is going to happen to the cells of the slug? (don’t do this to the poor slugs ) Scenario 3 Your garden is infested with slugs so you go around pouring salt on them

  15. Practice • By yourself or with a partner (anyone), work on the diffusion problems. • First try to do this by yourself, then verify your answers with a partner. Try to help each other. If you are confused, raise your hand and I will come help you!! • If you finish early, try to answer the “Think about it” questions on my desk! If you don’t finish, please finish it for homework.

  16. 3-2-1 Exit Slip • On a SEPARATE sheet of paper… • List 3 things you learned today • List 2 things you are confused about • List 1 thing you found interesting

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