OSMOSIS and DIFFUSION. Molecules are always moving Molecules move randomly and bump into each other...
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Transcript of OSMOSIS and DIFFUSION. Molecules are always moving Molecules move randomly and bump into each other...
![Page 1: OSMOSIS and DIFFUSION. Molecules are always moving Molecules move randomly and bump into each other and other barriers.](https://reader035.fdocuments.net/reader035/viewer/2022062408/56649eeb5503460f94bfc21e/html5/thumbnails/1.jpg)
OSMOSIS and DIFFUSION
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Molecules are always moving
Molecules move randomly and bump into each other and other barriers
![Page 3: OSMOSIS and DIFFUSION. Molecules are always moving Molecules move randomly and bump into each other and other barriers.](https://reader035.fdocuments.net/reader035/viewer/2022062408/56649eeb5503460f94bfc21e/html5/thumbnails/3.jpg)
Molecules in solution tend to slowly spread apart over time. This is diffusion.
T1
T2 T3
Diffusion
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Diffusion• Movement of molecules from an area of high
concentration to an area of lower concentration. • Factors that affect the rate of diffusion: size of molecules,
size of pores in membrane, temperature, pressure, and concentration.
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Diffusion
[High] [Low]
concentrated, high energy molecules
diffuse, low energy molecules
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Diffusion will continue until equilibrium is reached. This means there will be an equal distribution of molecules throughout the space. This is why food coloring moves throughout a beaker of water; why odors smell strong at first and then disappear over time.
Equilibrium, a result of diffusion, shows the uniform distribution ofmolecules of different substances over time as indicated in the above diagram.
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Which molecules will diffuse in each of the figures below?
1 2 3 4
5 6
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ANSWERS1 2 3 4
5 6
No Movement
No Movement
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Osmosis• Osmosis is the movement of WATER across a
semi-permeable membrane• At first the concentration of solute is very high on
the left.• But over time, the water moves across the semi-
permeable membrane and dilutes the particles.
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Over time molecules will move across the membrane until the concentration of solutes is equal on both sides. This type of solution is called ISOTONIC.
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• Below are examples of red blood cells in different types of solutions and shows what happened to the red blood cells.
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Turgor Pressure builds in the cell and causes osmosis to stopbecause of the rigid cell wall.
Plants will wilt when cellslose water through osmosis.
Hypotonic Solution
HypertonicSolution
PLANT CELLS
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ELODEA CELLSAs viewed under the microscope
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THE END