Top answers

Chemistry
A Level

A 20cm³ sample of lithium hydroxide solution of unknown concentration is neutralised by 12.25cm³ of 0.15mol/dm³ of sulfuric acid. Calculate the concentration of the lithium hydroxide solution.

0.184mol/dm³

SA
4813 Views

How do you determine the shape of molecule?

Molecular shape is based on VSEPR Theory which states that electrons in lone pairs repel other electrons in lone pairs the most. Electrons in lone pairs repel electrons in bonding pairs less and electrons...

DS
Answered by Daniel S. Chemistry tutor
7320 Views

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...

SL
Answered by Sam L. Chemistry tutor
3246 Views

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...

EW
Answered by Emily W. Chemistry tutor
3291 Views

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...

AW
Answered by Archie W. Chemistry tutor
18888 Views

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