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Chemistry
A Level

How does a change in temperature affect the Kc value when the forward reaction is exothermic?

To explain this I will use a made up example question: A2(g) + B2(g) <-> 2AB Change in enthalpy= Negative remember: according to Le Chatlier's principle, if a system in e...

Answered by Ruairi O. Chemistry tutor
9491 Views

Explain the trends in reactivity as you move down group one elements.

As you move down group one atomic radius increases. As a result the attraction to outer electrons is weaker. As there are an increased number of energy levels, shielding to the outer electrons also increa...

Answered by Jack J. Chemistry tutor
2430 Views

Explain how fractional distillation works.

Hydrocarbons have different boiling points and therefore different condensation points. The linger the hydrocarbon, the more intermolecular forces exerting between each molecule. This means that it requir...

Answered by Nick S. Chemistry tutor
5395 Views

Explain the trend in 1st ionisation energy across the period 3 elements, explaining the anomalies of aluminium and sulfur.

The overall trend is that the 1st ionisation energy increases. This is because as the nuclear charge increases, the attraction of the nucleus to the surr...

Answered by Jack W. Chemistry tutor
8447 Views

What is meant by the term optical isomerism?

Optical isomerism is a form of stereoisomerism (different arrangement of the same atoms in 3D space) which is caused by the presence of a chiral carbon in a molecule. A chiral carbon is a carbon with four...

Answered by Sophie M. Chemistry tutor
1557 Views

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