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Chemistry
A Level

Why is there a difference in mechanism between tertiary halogenoalkanes and primary halogenoalkanes in nucleophilic substitution?

The difference in mechanism between tertiary halogenoalkanes and primary halogenoalkanes is caused by the difference in relative stability between the two carbocation intermediates formed. In the case of ...

NO
Answered by Nketia O. Chemistry tutor
13429 Views

Explain why the enthalpy of lattice dissociation of potassium oxide is less endothermic than that of sodium oxide.

Lattice dissociation enthalpy is the enthalpy change when one mole of a gaseous ionic lattice dissociates into isolated gaseous ions. The process is endothermic because energy is required to overcome the ...

LJ
Answered by Louise J. Chemistry tutor
23173 Views

a sample of hydrated NiSO4 witha mass of 4.414g is heated to remove all water crystallisation. The resultant mass is 2.287g. How many H2O molecules to each NiSO4 were there in the original sample

Mr of NiSO4 is 154.8 g/mol Mr of H2O is 18

Mass of NiSO4 in sample is 2.287 g Mass of H2O in sample is 4.414-2.287 = 2.127g

divide mass of each of NiSO4 and H2O by Mr to obtain the ratio in ...

CS
Answered by Calum S. Chemistry tutor
2791 Views

Can you explain acylation?

Acylation is a broad term for any reaction where an acyl group is added to a compound.

An acyl group is comprised of a ketone group (C=O) with an alkyl group attached to the carbon. RCO(-) is the g...

RL
Answered by Ryan L. Chemistry tutor
5185 Views

What is the difference between an ionic and covalant bond?

A covalant bond is a very strong bond between two atoms. These atoms share a pair of electrons and form molecules.

An ionic bond occurs between two ions (charged atoms). Ions form when an atom lose...

AS
Answered by Anokhi S. Chemistry tutor
3215 Views

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