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Chemistry

A Level

What does ‘aromatic’ mean?

In A Level Chemistry, the word aromatic means a molecule’s structure contains at least one cyclic ring which has a delocalised pi electron cloud above and below it. This occurs from unbonded P orbital ele...

Answered by Sam L. • Chemistry tutor

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Explain what is meant by optical isomerism.

Stereoisomers are molecules that have the same structural formula, but a different arrangement of the atoms in space.Optical isomers are a type of stereoisomers where the two molecules have non-superimpos...

Answered by Emily W. • Chemistry tutor

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Explain the delocalised model of benzene, and hence why it is less reactive with electrophiles than cyclohexene

Benzene consists of a ring of 6 carbon atoms bonded to each other by sigma bonds from the overlap of s orbitals.p orbitals above and below the ring overlap to form a delocalised pi system with rings of el...

Answered by Archie W. • Chemistry tutor

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Explain the difference between homolytic fission and heterolytic fission.

Homolytic fission:Homolytic fission occurs when the covalent bond breaks evenly, and each of the bonded atoms takes one of the shared pair of

Answered by Hannah W. • Chemistry tutor

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Explain why Magnesium has a greater second ionisation energy than strontium

Magnesium is a smaller atom with a smaller radius than strontium, this means the electron has a greater attraction to the nucleus. Also as strontium has more orbitals the electron has more shielding from ...

Answered by Kelvin W. • Chemistry tutor

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