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An aldehyde will react with Tollen's reagent to form a characteristic silver mirror, whereas a ketone will not react. This is because an aldehyde can be oxidised to a carboxylic acid, reducing Tollen's re...

Completing the square means to put our equation into a slightly different form which looks like this, where a and b are real numbers:

(x+a)² + b = 0

From here, we...

This is a very important skill - for GCSE, above and below! 

The first stage is to read the poem at least twice, first just going over it, and the second time underlining or highlighting ...