BBC Bitesize - National 5 Biology - Transport across membranes - Revision 4
membrane which will allow water to pass. Fig An example of simple diffusion. Molecules of red dye gradually diffuse from areas of higher concentration to. Kids learn about Brownian motion, diffusion, and how temperature is a key factor from areas of high concentration to areas of low concentration until they become evenly The rate of diffusion refers to how quickly or slowly this process happens. . Science fair project that examines the relationship between fluid flow rate. Molecular weight will affect the rate of diffusion. All other things being constant, lighter weight molecules will move faster or diffuse faster that heavier molecules.
Similarly, lowering the temperature will lower the diffusion rate by lowering the energy of each particle. Concentration Difference The rate of diffusion depends on the difference between concentrations across the host material, with higher concentration differences resulting in higher diffusion rates.
Rate of Diffusion | Science project | mephistolessiveur.info
For example, diffusion through a thin wall or membrane will occur quickly if there is a high concentration of the gas on one side and none of the gas on the other side of the wall. If there is already an almost equal amount of gas on both sides, diffusion will be much slower.
Sciencing Video Vault Diffusion Distance The rate of diffusion is inversely related to the distance through which the material is diffusing.
That is, smaller distances result in faster diffusion rates and larger distances result in slower diffusion rates. This makes sense, since a gas diffuses through a thin wall much faster than it would diffuse through a thick wall.
Supplying the cell
Diffusing and Host Materials Diffusion rate also depends on both the material that is diffusing and the material it is diffusing through. At a certain temperature, all particles have the same average energy.
This means that lighter atoms, such as hydrogen, carbon, oxygen and nitrogen travel faster and are more mobile than larger atoms such as copper or iron. Watch and wait for color to disperse entirely.
Transport across membranes
Differently Shaped Containers Fill both containers with the same temperature of water. Drop one drop of food coloring in each of container and compare their rate of diffusion. Conclusions Temperature and the shape of the containers affected the rate of diffusion in both experiments.
Particles move faster in warmer water, so the red coloring spread more quickly through the cup. In addition, your access to Education. Warning is hereby given that not all Project Ideas are appropriate for all individuals or in all circumstances. Implementation of any Science Project Idea should be undertaken only in appropriate settings and with appropriate parental or other supervision.
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