osmosis and diffusion. molecules are always moving molecules move randomly and bump into each other...

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OSMOSIS and DIFFUSION

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Page 1: OSMOSIS and DIFFUSION. Molecules are always moving Molecules move randomly and bump into each other and other barriers

OSMOSIS and DIFFUSION

Page 2: OSMOSIS and DIFFUSION. Molecules are always moving Molecules move randomly and bump into each other and other barriers

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

Molecules in solution tend to slowly spread apart over time. This is diffusion.

T1

T2 T3

Diffusion

Page 4: OSMOSIS and DIFFUSION. Molecules are always moving Molecules move randomly and bump into each other and other barriers

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.

Page 5: OSMOSIS and DIFFUSION. Molecules are always moving Molecules move randomly and bump into each other and other barriers

Diffusion

[High] [Low]

concentrated, high energy molecules

diffuse, low energy molecules

Page 6: OSMOSIS and DIFFUSION. Molecules are always moving Molecules move randomly and bump into each other and other barriers

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.

Page 7: OSMOSIS and DIFFUSION. Molecules are always moving Molecules move randomly and bump into each other and other barriers

Which molecules will diffuse in each of the figures below?

1 2 3 4

5 6

Page 8: OSMOSIS and DIFFUSION. Molecules are always moving Molecules move randomly and bump into each other and other barriers

ANSWERS1 2 3 4

5 6

No Movement

No Movement

Page 9: OSMOSIS and DIFFUSION. Molecules are always moving Molecules move randomly and bump into each other and other barriers

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.

Page 10: OSMOSIS and DIFFUSION. Molecules are always moving Molecules move randomly and bump into each other and other barriers

Page 11: OSMOSIS and DIFFUSION. Molecules are always moving Molecules move randomly and bump into each other and other barriers

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.

Page 12: OSMOSIS and DIFFUSION. Molecules are always moving Molecules move randomly and bump into each other and other barriers

• Below are examples of red blood cells in different types of solutions and shows what happened to the red blood cells.

Page 13: OSMOSIS and DIFFUSION. Molecules are always moving Molecules move randomly and bump into each other and other barriers

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

Page 14: OSMOSIS and DIFFUSION. Molecules are always moving Molecules move randomly and bump into each other and other barriers

ELODEA CELLSAs viewed under the microscope

Page 15: OSMOSIS and DIFFUSION. Molecules are always moving Molecules move randomly and bump into each other and other barriers

THE END

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