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Chemistry
A Level

What is Effective Nuclear Charge?

Effective Nuclear Charge is the net positive nuclear charge experienced by a valence electron orbiting the positively charged nucleus in an atom. Effective nuclear charge is redcued by:

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Answered by Joshua O. Chemistry tutor
13308 Views

Without a catalyst, an alkene will react with bromine while benzene will not. Why is this?

The pi-bonds in benzene are delocalised over the entire ring, while in an alkene the pi-bonds are only delocalised over two carbon atoms. This means that benzene has a lower charge denisity than an alk...

Answered by Jack T. Chemistry tutor
15297 Views

How do I calculate the percentage by mass of a metal within an impure substance?

For this question we will look at Sodium Sulphite (Na2SO3) and its titration against Potassium Permanganate (KMnO4). This requires acidic conditions.

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Answered by Sebastian V. Chemistry tutor
12246 Views

What is the basis of an NMR spectrum?

Nuclear Magnetic Resonance (NMR) is a spectroscopic technique used to detect certain nuclei in a molecule.

1H and 13C are the most commonly identified nuclei , howev...

Answered by Joanna T. Chemistry tutor
3092 Views

(Chemistry A-level) What is a dative covalent bond?

A dative covalent bond, or coordinate bond, is a bond where there is 1 pair of shared electrons between two atoms. The difference relative to a covalent bond is that in a dative covalent bond these electr...

Answered by Oliver B. Chemistry tutor
81255 Views

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