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Word Count: 630
Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration Diffusion results because of the random movement of particles The diffusion of water into and out of a selectively permeable membrane is called osmosis Because of the selectively permeable membrane nothing but water and other very small particles can be diffused through osmosis The cell membrane is similar to the membrane mentioned above so the cell would lose water because of osmosis if it were placed in an environment in which water concentration is greater than that of the cell A solution is isotonic if the concentration of dissolved substances is the same as the concentration inside the cell Osmosis does not occur in an isotonic solution A hypotonic solution is a solution in which the concentration of dissolved substances is lower than the concentration inside the cell If a cell were put in a hypotonic solution osmosis will cause water to move through the cell membrane into the cell A solution is hypertonic if its concentration of dissolved substances is greater than the concentration inside the cell If a cell were placed in a hypertonic solution it would lose water All particles that pass through the plasma membrane by the process of diffusion do not require energy so their movement is called passive transport The transport of materials against a concentration gradient requires energy so it is called active transport The purpose of this experiment was to make observations and conclusions about the ability of cells to adjust to varying chemical concentrations in the environment and to observe the effect of isotonic hypotonic and hypertonic solutions on cells I hypothesize that when the sucrose concentration will change the mass will also change For the experiment the following materials were used potatoes petri dishes a balance a graduated cylinder distilled water sucrose solution and five beakers Each of the beakers were labeled with a different sucrose
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