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What are the three pieces of evidence that disprove the Kekulé model of Benzene?

The enthalpy change of hydrogenation is less exothermic than suggested by the Kekulé model ( -208kJmol^-1 instead of the expected -357kJmol^-1), meaning Benzene is more thermodynamical...

Answered by • Chemistry tutor

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A coil is connected to a voltmeter. A bar magnet, initially held above the coil, is left to fall into the coil. Explain why the voltmeter shows a reading. How will the reading of the voltmeter be affected if the magnet is dropped from a greater height?

As the bar magnet enters and exits the coil, there is a change in magnetic flux linkage through the coil. According to Faraday's law, an EMF is induced across the coil that is proportional to the rate of ...

Answered by Andrea A. • Physics tutor

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Explain, with the aid of annotated diagrams, the various stages and processes involved in the formation of a stack.

Hydraulic action and constant pounding of the waves against the rock causes faults and weaknesses in the cliff. Overtime, faults are enlarged as the pressurised air cracks the rocks and forms a wave- cut ...

Answered by Hannah W. • Geography tutor

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Simplify 5p + 2q – 3p – 3q

Firstly, look at the number in front of the letter 'p'. This is 5p and -3p. By ignoring the 'p', as they both have it, do 5-3 which is 2 and so that part of the answer will be 2p. Then look at the letter ...

Answered by Radhika A. • Maths tutor

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