OCR AS - Chemistry Unit F322 - Chains, energy and resource - REVISION!

overall do you think you ahve done good lol

how was it -1279 it was +1279 for the formation question!!!!!!!!!!!! some one explain

you were given enthalpy change of combustion, so you have to draw a hess cycle

for the last question I've drawn out the structure of the alcohol, carboxylic acid and the ester but I didn't put down their names... Do people think I would have lost a mark for not naming them?

No it just sed identify them so you'll defo get the mark

you were given enthalpy change of combustion, so you have to draw a hess cycle

You don't need to draw a Hess's cycle... Common sense should prevail in the fact that ALL COMBUSTION REACTIONS ARE EXOTHERMIC.

These people shouldn't even be allowed to do A-level Chemistry. It's just moronic to even ask these questions.

It was definitely combustion. It asked for the definition of the enthalpy of combustion as well.

It was definitely combustion. It asked for the definition of the enthalpy of combustion as well.

You always use the data in the table. It was combustion - reactants minus products. I think it was -ve

im sure it said work out the standard entahlpy of formation

It did but it said 'using the combustion bond enthapies in the table'

In the table there was bond enthalpies for combustion. You always do R-P.

It actually kills me to read this. Where was I and how did I not write this? All I managed to write was increased pressure causes an increase in rate of reaction, I don't think I explained. As for the composition one, I said the temp and concentration or whatever was unchanged so composition stayed the same. 5/4 silly, pathetic marks gone. Argh!

for 10 marks for that mechanism question how can you get 10 marks lol dont mind me asking

Which mechanism. The halogenoalkanes?