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Diffusion osmosis
- 2. Define Diffusion The movement of molecules from a area in which they are highly concentrated to an area in which they are less concentrated.
- 3. Diffusion 3
- 4. Diffusion • Particles in a liquid or gas spread out… 3
- 5. Diffusion • Particles in a liquid or gas spread out… • … from regions of high concentration… 3
- 6. Diffusion • Particles in a liquid or gas spread out… • … from regions of high concentration… • … to regions of low concentration… 3
- 7. Diffusion • Particles in a liquid or gas spread out… • … from regions of high concentration… • … to regions of low concentration… • …until the particles are evenly spread out. 3
- 8. Diffusion • Particles in a liquid or gas spread out… • … from regions of high concentration… • … to regions of low concentration… • …until the particles are Dissolving evenly spread out. KMnO4 crystal 3
- 9. Examples Perfume - perfume gas molecules diffuse into the air when put on so you can smell it. Air freshener/deodorant - same concept as above. Any smell (flower fragrance, garbage stink, skunk, body odor xD) Drop a drop of ink into a glass of water - the ink would diffuse Teabag diffusion - tea leaves diffuse through teabag to give the water its color and taste of tea Cigarette smoke - it diffuses into the air and spreads throughout the room 4
- 10. • Diffusion occurs because the particles in gases and liquids are moving. 5
- 11. • Diffusion occurs because the particles in gases and liquids are moving. 5
- 12. Dissolving substances in water 6
- 13. Dissolving substances in water • The molecules in liquid water are constantly moving 6
- 14. Dissolving substances in water • The molecules in liquid water are constantly moving • When water molecules bump into particles of a soluble substance, they stick to them 6
- 15. Dissolving substances in water • The molecules in liquid water are constantly moving • When water molecules bump into particles of a soluble substance, they stick to them Free moving water molecules Sugar molecules in sugar lump 6
- 16. • When the water molecules move away… 7
- 17. • When the water molecules move away… 7
- 18. • When the water molecules move away… … they carry particles of the solute with them 7
- 20. 9
- 21. See animations of diffusion here: http://highered.mcgraw-hill.com/sites/0072495855/ student_view0/chapter2/ animation__how_diffusion_works.html FOOD COLORING DIFFUSION http://www.youtube.com/watch?v=STLAJH7_zkY
- 22. Define osmosis Thediffusion of water across a selectively permeable membrane.
- 23. Define osmosis Water moves from a high concentration of water (less salt or sugar dissolved in it) to a low concentration of water (more salt or sugar dissolved in it). This means that water would cross a selectively permeable membrane from a dilute solution (less dissolved in it) to a concentrated solution (more dissolved in it). http://www.usd.edu/~bgoodman/Osmos.htm
- 25. Define osmosis In this picture a red blood cell is put in a glass of distilled water (all water with no salt or sugar in it). Because there is a higher concentration of water outside the cell, water enters the cell by OSMOSIS. In this case too much water enters and the cell swells to the point of bursting open. In the end pieces of cell membrane are left in the water. http://www.usd.edu/~bgoodman/Osmos.htm
- 26. See an animation of osmosis here: http://highered.mcgraw-hill.com/sites/0072495855/ student_view0/chapter2/ animation__how_osmosis_works.html YOU TUBE OSMOSIS http://www.youtube.com/watch?v=sdiJtDRJQEc
- 27. Define selectively permeable membrane A membrane that allows only certain materials to cross it Materials pass through pores in the membrane
- 29. Partially-Permeable Membranes • A partially-permeable membrane will allow certain molecules to pass through it, but not others. 17
- 30. Partially-Permeable Membranes • A partially-permeable membrane will allow certain molecules to pass through it, but not others. Partially permeable membrane 17
- 31. Partially-Permeable Membranes • A partially-permeable membrane will allow certain molecules to pass through it, but not others. Partially permeable • Generally, small membrane particles can pass through… 17
- 32. Partially-Permeable Membranes • A partially-permeable membrane will allow certain molecules to pass through it, but not others. Partially permeable • Generally, small membrane particles can pass through… 17
- 33. Partially-Permeable Membranes • A partially-permeable membrane will allow certain molecules to pass through it, but not others. Partially permeable • Generally, small membrane particles can pass through… …but large particles cannot 17
- 34. Why are osmosis & diffusion important?
- 35. Why are osmosis & diffusion important? All living things have certain requirements they must satisfy in order to remain alive – maintain homeostasis These include exchanging gases (usually CO2 and O2), taking in water, minerals, and food, and eliminating wastes. These tasks happen at the cellular level. Molecules move through the cell membrane by diffusion
- 36. Why are osmosis & diffusion important? Allliving things have certain requirements they must satisfy in order to remain alive. These include exchanging gases (usually CO2 and O2), taking in water, minerals, and food, and eliminating wastes. These tasks ultimately occur at the cellular level, and require that molecules move through the membrane that surrounds the cell.
- 37. Why are osmosis & diffusion important? Thismembrane is a complex structure that is responsible for separating the contents of the cell from its surroundings, for controlling the movement of materials into and out of the cell, and for interacting with the environment surrounding the cell.
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