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A reversible reaction is one where the reaction can occur both ways. Therefore, in a closed system where nothing can escape, some products made will always react in the reverse direction to make the reactant...

Antibiotics are used for killing bacteria and therefore, it can act as a selection pressure. This means that the bacteria can mutate, in order to avoid being killed and this would be a favourable mutation, a...

First we find two numbers that that add up to -8 and multiply to make 15. In this case the numbers are -3 and -5. This means we can now factorise the quadratic to give (x - 5) (x - 3) = 0. For the above to b...

Forming the perfect tense in French is simple: you need to firstly decide whether the verb you want to conjugate is avoir or être. If the verb is avoir, then you must first conjugate avoir in the present ten...

Another way in which the theme of death is shown is through the structure of these two poems. There are differences in the way the poems are structured. Hardy’s ‘The Man He Killed’ is written in quatrains, w...