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Purpose is the reason you are writing the text. In this case it is to persuade your audience into thinking in a certain way. It is important to read carefully in the question as to who your audience is as...

Firstly, make sure to draw a picture! Worded questions are used to catch people out. Drawing a diagram makes solving certain problems much easier.

Secondly, notice that we are asked for two pieces ...

First ionisation energy is the energy required to remove one mole of electrons from one mole of gaseous atoms, to produce one mole of gaseous ions each with a (+1) charge.

Barium has more energy le...

Lawyers are frequently available, and in most areas of the country.  They are generally specialists in specific areas of law, which is needed in a system as complex as the legal system, and know relevant ...

You need to look at the numerical side - numbers of objects, numbers of corners, numbers of sides to the shapes, the number of shapes + to the number of corners, the number of lines and contained shapes e...