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For the exams, the definition you will need to know is that "diffusion is the net movement of a substance from an area of high concentration to an area of low concentration, down a diffusion gradient&qu...

There are six main methods of promotion that businesses can use. The first method is advertising, which is above-the-line promotion, and involves any form of advertising such as TV or radio adverts, billboar...

58.5 Relative formula mass (M r ) is found by adding together the relative atomic masses (A r ) of all the atoms present in a compound. Sodium Chloride is NaCl. The relative atomic masses can be found in the...

Alkanes are saturated because they contain only single covalent bonds. Alkenes are unsaturated because they do have double covalent bonds.

To alter the size of the pupil, so the correct intensity of light is allowed through. Enough light is let through to allow clear vision, but not so much light that the retina might become damaged.