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Electrophilic aromatic substitution ( S E Ar ) is an organic reaction in which an atom that is attached to an aromatic system (usually hydrogen) is replaced by an electrophile. An electrophile is reagent tha...

Historiography is the essentially ‘the history of history’. In the typical study of history you will be looking at events and facts- analysing why they happened and the causes and consequences. Historiograph...

Firstly we must figure out what we know about this particle. We have its stangeness which is 1 and we know its charge from the "+" symbol in the question, which is also 1.For the first bit we shoul...

First let y=ln(x). Recall that the exponential function, e x , is defined as the inverse of the logarithmic function, ln(x). To make x the subject of the formula, use the inverse function exp. This gives tha...

Let's start with the definition of sin( x ) and cos( x ). We're going to use t rather than x here to avoid confusion, but the idea is exactly the same. Take a unit circle - that is, a circle with centre (0,0...