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Your essay should include an introduction, 3 main points (or possibly 4, although the tight timing of A level examinations means 3 may be better as you can go in to more detail) and conclusion.
The i...

12x^2-6x+9

First ionization enthalpy is the energy required to remove one electron from each atom in one mole of gaseous atoms, forming one mole of gaseous 1+ ions. The first ionization enthalpy is largely dependent...

i)L(r) vector line equations in general are in the form L(r) = p1 + λ (p2) where p1 is any ponit on the line and p2 is the vector direction of the line(unsure how to get the whiteboard up or i would descr...

(a) If we consider the intersection of these two lines then, 3x-7=2px^2-6px+4p.This can be rearranged into the form ax^2+bx+c=0 such that, 2px^2+(-6p-3)x+4p+7, where a=2p, b=-6p-3 and c=4p+7.However, sinc...