1 12 Osmosis


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1 12 Osmosis

  1. 1. Launch <ul><li>What do the words “hydro” “philac” “phobic” mean? </li></ul><ul><li>What is the cell membrane made up of? </li></ul><ul><li>What are the two parts of a phospholipid and what are the characteristics of each? </li></ul>
  2. 2. Congratulations to B5 for the highest percentage of homework turned in last week!
  3. 3. Osmosis
  4. 4. Make a hypothesis based off the following information: <ul><li>We are placing corn starch in a ziplock bag and placing the ziplock in a beaker that contains iodine </li></ul><ul><li>Note that: </li></ul><ul><li>Iodine turns color when in contact with a carbohydrate. </li></ul><ul><li>Corn starch is obviously a starch and therefore a ____________________ </li></ul>
  5. 5. Objectives <ul><li>SWBAT describe the structure of a cell membrane </li></ul><ul><li>SWBAT explain the process of osmosis </li></ul>
  6. 6. Vocabulary <ul><li>Solution : mixture of dissolved molecules </li></ul><ul><ul><li>Solvent : the liquid that the molecules are dissolved in </li></ul></ul><ul><ul><li>Solute : the dissolved molecules </li></ul></ul><ul><li>Concentration : measurement of how much solute is the solution </li></ul>
  7. 7. Review <ul><li>What is the function of the cell membrane ? </li></ul><ul><ul><li>Controls/regulates what enters or leaves a cell </li></ul></ul><ul><ul><li>Protect and supports the cell </li></ul></ul>
  8. 8. <ul><li>Made of a double-layered sheet called a phospholipid bilayer </li></ul><ul><li>Has proteins and carbohydrates mixed into the layers </li></ul>What is the cell membrane made of?
  9. 9. What is a phospholipid? <ul><li>Type of lipid with special characteristics </li></ul><ul><ul><li>Has a hydrophilic (water-loving) area and a hydrophobic (water-fearing) area </li></ul></ul>Hydrophilic Hydrophobic
  10. 10. Semi-permeability <ul><li>The cell membrane is semi-permeable (selective about what can enter/leave) </li></ul><ul><li>Water is one molecule that can pass easily across the cell’s membrane </li></ul>
  11. 11. Diffusion <ul><li>Any movement of molecules from a HIGH concentration to a LOW concentration. (things go from where there is a lot to where there is a little) </li></ul><ul><li>Diffusion can be when things move ACROSS the membrane (from high to low concentration) </li></ul>
  12. 12. What is osmosis? <ul><li>Osmosis = the diffusion of water through a selectively permeable membrane </li></ul><ul><li>Water will move from an area of high concentration to an area of low concentration to achieve equilibrium (balance) </li></ul>
  13. 14. How to describe solutions <ul><li>Isotonic : solutions both have the same concentration of solutes </li></ul><ul><li>Hypotonic : solution has less solute than the other solution (below strength) </li></ul><ul><li>Hypertonic : solution has more solute than the other solution (above strength) </li></ul>
  14. 15. Hypotonic solution Isotonic solution Hypertonic solution