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Chemistry
A Level

Give and explain 2 of the anomalous properties of ice caused by hydrogen bonding

Compared to water ice is less dense this is due to hydrogen bonds in the open lattice holding the H2O molecules apart whereas in liquid form the hydrogen bonds break allowing the molecules of w...

Answered by Morgan T. Chemistry tutor
19373 Views

What shape does XeF4 take?

Molecular shape depends on the number of electron pairs around the central atom. Electrons are negatively charged and so each of the electron pairs will repel each other. Lone pairs tend to repel more tha...

Answered by Laura S. Chemistry tutor
5718 Views

Explain why the structure of benzene cannot be acurately described using Kekule's structure (cyclohexa-1,3,5-triene).

During analysis of benzene we see that the bond lengths and angles are all the same. In the theoretical molecule however, due to the differing lengths of bonds between double and single bonds, the bond le...

Answered by William T. Chemistry tutor
2222 Views

Why does boiling point decrease down group 1 in the periodic table? [3 marks]

Atomic radius increases
Although nuclear charge increases, this is outweighed by the increased shielding from inner shell electrons
Therefore, nuclear attraction to the delocalised electrons dec...

Answered by Chemistry tutor
2361 Views

What is the difference between a sigma and pi bond? Use your answer to explain why there is fixed rotation about the C=C bond.

What is an atomic orbital? Electrons are not entirely confined within the atom. An orbital is the defined space around the central nucleus of an atom where electrons are predicted to be. Each can contain ...

Answered by Chenai M. Chemistry tutor
3474 Views

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