This is a little complicated presentation on Diffusion.I have made this to give ideas to students as to help them in making a new one.This is specially made for the students of 9th and 10th.You must see this and learn to make something new.

1. CHEMISTRY PROJECT ON: DIFFUSION

2. Diffusion

3. Diffusion Movement of molecules from an area of high concentration to an area of low concentration. Movement from one side of a membrane to another, un-facilitated.

5. … from regions of high concentration…

6. … to regions of low concentration…

8. All substances are made up of sub-microscopic particles called molecules. In gases (like air) the molecules can move freely. In liquids (like water) the molecules can also move. In solids the molecules are more or less stationary.

9. Representation of molecules in a gas (a) (b) As a result of their random movements the molecules become evenly distributed.

10. Diffusion As a result of this random movement, the molecules of a gas become evenly dispersed This movement is called DIFFUSION. The scent of a room freshener diffuses throughout a room. The scent molecules diffuse from a region where they are concentrated (the flower) to regions where they are absent or in low concentration.

11. One of the ways substances enter and leave cells is by diffusion. If a substance is more concentrated outside a cell than inside, the molecules will tend to diffuse into the cell. If a substance is more concentrated inside the cell than outside, the molecules will tend to diffuse out of the cell.

12. If all kinds of substance could diffuse into a cell there would be a danger that poisonous substances could diffuse in and kill the cell. If all the substances in a cell could diffuse out the cell would lose essential substances (e.g. glucose) needed to keep the cell alive. In fact, although the cell membrane does allow some substances (e.g. oxygen and carbon dioxide) to diffuse freely, it controls the exit and entry of nearly all other substances.

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