Alkane's boiling point graph

When I plot the boiling points of the Alkane, there is a curve. I know it is because of the amount of Van de Walls forces that makes their boiling point go up as the molecules get bigger. But the increase is 2n+2 of H and 1 of C everytime so the graph should be a straight line. Why is it a curve? (i am sure the boiling points and my graph is correct)


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Cool, i am learning A level stuff at GCSE level :)

I seem to get the impression Hong Kong students always seem to be doing more than we ever did :?

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