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When solving equations such as these we have two variables which represent two numbers. In order to solve them we want to isolate and remove one of the variables so we are only left with one, we do this b...

The Avogrados constant the number of atoms in a mole. This is 6.02 x10^23.
The number of moles are calculated through diving the mass (g) by the relative molecular mass of an element.

Addition of fractions involve the finding of a common denominator. This would aid the addition.
The multiplication of fractions can be made much easier through finding if they can be made smaller thr...

This involves water molecules which are transported from an area of high concentration to a low concentration. This transportation is termed diffusion. This would occur through a partially permeable membr...

The gradient of the line L is -2 so the gradient of the line perpendicular to L will be the negative reciprocal of -2 which is 1/2.The equation of the line perpendicular to L will be y=mx+c where m is the...