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Why does Benzene require a catalyst to react with Bromine whereas Phenol does not?

The -OH is an activating group, it donates its lone pair into the delocalised ring of electrons. This increases the electron density in the ring, making it more reactive.
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Answered by Frankie L. • Chemistry tutor
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If 3x^2 = 48 find x

3x^2 = 48 x^2 = 16 x = 4
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Answered by Frankie L. • Maths tutor
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The equation 3x^2 – 5x + 4 = 0 has roots P and Q, find a quadratic equation with the roots (P + 1/2Q) and (Q + 1/2P)

We know the roots of the equation 3x 2 - 5x + 4 = 0 is P & Q, therefore is is equivalent to (x - P)(x - Q) = 0. Expanding the expression we get x 2 - x(P+Q) + PQ = 0 . Equating coefficents with the origi...
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Find the General Second Order Differential Equation Using Substitution (A2 Further Maths)

Find the General Second Order Differential Equation 4x 2 d 2 y/dx 2 - 8x dy/dx +(8+4x 2 )y = x 4 , Transform Using y = vx. 1) Differentiate both sides of y = vx (apply Product Rule to right hand side) dy/dx ...
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Outline the main features of the Working Memory Model?

The working memory model was developed by Baddeley and Hitch (1974). It is an explanation of how short-term memory is organised. There are four main features to the model; the central executive, the phonolog...
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