How Does The Concentration Affect The Rate Of Diffusion
The first lab will investigate the movement of glucose and starch across a selectively permeable membrane through a process of diffusion. The movement of a solute through this membrane is called dialysis . Diffusion is a form of passive transport. It is the movement of molecules from areas of higher concentration to those of lower concentration, until there is an even concentration. This movement is random because it is a result of kinetic energy. Diffusion is a slow process, but there are many factors that will affect it’s rate. The rate of diffusion will vary depending on the size of the particle. For example, a smaller particle will move faster than a large molecule at a given temperature . During reactions, when there is more energy, the reaction will take place at a faster rate. An increase in temperature will result in and increase in the amount of energy available, therefore the particle will move faster and the rate of diffusion will increase. Another factor affecting the rate of diffusing is the density of the substance being diffused. As the density of the substance becomes higher, the mass of each particle will also increase causing the reaction rate to become slower. Lastly, the
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This means that when there is a large difference in the concentrations, there are more effective collisions in the molecules resulting in an elevated reaction rate. All cells have a selectively permeable membrane. These membranes only allow certain molecules to pass through them by either passive or active transport. The dialysis bag being used in Lab 1A is an example of a selectively permeable membrane. Small molecules like water are able to move liberally across the membrane but larger molecules will take more time to pass through. The movement of molecules across this membrane, against the concentration gradient, is called
This means that when there is a large difference in the concentrations, there are more effective collisions in the molecules resulting in an elevated reaction rate. All cells have a selectively permeable membrane. These membranes only allow certain molecules to pass through them by either passive or active transport. The dialysis bag being used in Lab 1A is an example of a selectively permeable membrane. Small molecules like water are able to move liberally across the membrane but larger molecules will take more time to pass through. The movement of molecules across this membrane, against the concentration gradient, is called