hey!
The paper was ok. I also got F20 for the oxide of the most electronegative element and i also explained the existence of the iodine compund and the non existence of the chlorine compund in terms of the small difference in electronegativity for the Cl and F bt the larger electronegativity difference for the i anf f hence the compund exhibits enhanced stability.
What did you say fopr the two reactions with NaOH, one was the nucleophilic substitition of a halogenoalkane while the other was the neutralisation reaction of Hcl with NaOH. Why did the hyalegenoalkane need heating while the nuetralisation was almost instantaneous???
I wrote that the nucleophilic substitutin was endothermic and had a large activation energy hence requires heating inorder to enable the reaction to go on to completion. I then said the neutralisation was exothermic and hence the initial reaction provides enough energy to activate the subsequent reaction as the Ea was small in comparison to the enegy evovled by the reaction... is this ok for the 4 marks... A couple of guys explained it in terms of the existence of the intermediary in the nuclephilic substitution while the nuetralisation was a simple bimolecular reaction. (activated complex theory)
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