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Solve complimentary function: Let y = e^mx then,
d²y/dx² - 5dy/dx + 4y = 0
m²e^mx - 5me^mx + 4e^mx = 0 (substituting fo...

There are two ways to affect the boiling point, both of which are to do with London forces found between molecules. Firstly, the chain length. If the chain length increases, the molecules will have a larg...

The best way to improve time management is by practising past papers. These can be found on your exam board website e.g. AQA, Edexcel etc. By completing a past exam paper under timed conditions you are pu...

1. Read the scenario throrughly! No word is there for no reason. Any ambiguities are not an accident, they are there to make you think and question the law. 

2. Take your time. It is...