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To start, it is important to have a clear understanding of what an enzyme is. An enzyme is a biological molecule which speeds up the rate of a reaction without being changed or used up in the process. Eac...

Solution: x=4. This can be shown by factorisation or applying the quadratic formula.

Most GCSE papers are split between a number of short answer questions worth a few marks and then one or two longer 'essay-style' questions which are worth considerably more. The key thing to focus on is e...

A good way of answering this question is by examining the various ideologies that played a role in WW2 and the ways in which they brought about conflict. The key ideological battles to be analysed are tho...

Sodium chloride is an ionic compound. It is made of sodium ions which have lost an electron to become positively charged (Na+) and chloride ions which have gained an electron to become negatively charged ...