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What evidences are used to prove that Benzene's kekule model is incorrect and that Benzene has a delocalised Pi structure.

The enthalpy Change of Hydration for cyclohexene is 120 kJmol^-1therefore if the Kekule model is correct then the Enthalpy change of Hydration would be 360 kJmol^-1however as it is c...

Answered by Muin A. • Chemistry tutor

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Explain the Berlin Blockade.

The Berlin Blockade began on the 24th June 1948. It occurred during the division of Germany following Germany's defeat in World War Two. It was decided by the wartime allies that Germany be divided into f...

Answered by Juliet D. • History tutor

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Find the stationary point(s) on the curve 2xsin(x)

Derivative of 2xsin(x): 2sin(x)+2xcos(x)Set derivative equal to zero: 2sin(x)+2xcos(x)=0Solve: only valid when x=0Therefore the only stationary point is (0,0) ie the origin.

Answered by Seyi O. • Maths tutor

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“Despite the policy of Destalinisation, the main features of Stalinism were still intact in the USSR at the time of Khrushchev’s fall from power in 1964” Assess the validity of this view

Stalinism is defined as the ideological pursuits of Stalin’s reign, seen in the command centralised economy, and the application of a totalitarian rule to reach Communism. De-stalinisation refers to the p...

Answered by Iona T. • History tutor

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A person stands on top of a cliff and throws a ball with a speed of 20 m/s at an angle of 10 degrees from above the horizontal into the sea. What is the height of the cliff to 1 decimal place?

I would begin by instructing them to draw a diagram of the problem. This would be of a cliff, labelled height s_y, with an arrow representing the ball being thrown from the top. This should be l...

Answered by Archie C. • Physics tutor

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