Testable Question Is It Possible To Observe Diffusion Across A

512 words - 2 pages

Testable Question Is it possible to observe diffusion across a semi-permeable membrane? Background Research Diffusion is the movement of molecules from an area of higher concentration to that of a lower concentration. Once the particles have reached equilibrium, there is no longer any net movement because a gradient no longer exists. It is the result of the random movement of molecules or Brownian Movement. •1 Dialysis is a separation technique used to retain large molecules in one region while permitting smaller molecules to pass through to a different region. In dialysis, the selectivity in movement of molecules is accomplished by placing a semi-permeable membrane between two regions, for example, dialysis tubing. The dialysis tubing is acting as a semi-permeable membrane. Osmosis or Plasmolysis is the movement of water through a selectively permeable membrane from a region of higher water concentration to a region of lower water concentration. Plant cells have a cell wall as well as a plasma membrane. The cell wall is a rigid structure that is used by the cell to create osmotic pressure within the cell. With the loss of this osmotic pressure the supportive structure of the plant is lost and the plant becomes limp and shriveled. By adding particles such as Na and Cl, the osmotic pressure within the cell decreases. The result of this decrease in osmotic pressure is the shrinking of the cell. The movement of water from the inside of the cell to the outside causes the cell membrane to shrink away from...

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