Calculate the surface area of the following:


Q. A cube of side length 25mm


Q. A cube of side length 50mm which has been cut into cubes of side length 1mm.


Q. A cube of side length 1 m which has been cut into cubes of side length 1 nm (we are now looking at a nano particle scale).


Q. Calculate the surface area to volume ratio of a cube with sides equals 1 mm, then perform the same calculation with a cube of sides 50 mm and comment upon which would be best served for diffusion through the membrane.


Q. This question talks about diffusion.


A river running past an industrial estate is polluted with contaminants as a result of an industrial mistake. As a result of this pollution the concentration of dissolved oxygen in the water is reduced. What effect, if any would this have on the rate of diffusion of oxygen into the gills of fish that live in the water?


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