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A C to C double bond has a high electron density. As the bromine gets close to the C=C bond the high electron density repels the electrons in the H-Br bond further towards the H making the H slightly n...

'Compare and contrast' is the opening to a great many literature questions, from GCSE right through to degree. At A level you'll be expected to not only discern the difference but demonstrate you have ...

An audience is the group of people the writer is addressing. 

There are 3 main purposes for writing: (examples in text messages)

1) To inform: "not coming over tonight....

When the population of a species is separated, each group is put under different selection pressures due to differing environments. In each population there is genetic variation, and more offspring are...

As we are looking to find the area under a curve we can use integration. The area under a curve with equation y = f(x), bounded by the lines x = a and x = b and the x axis can be expresse...