June 2010- OCR Chemistry F322

For question 1ev why didn't they accept anything about percentage yield?
Also for 2cii does the peak of the catalyst hump always have to be to the right of the normal one?
and for 7 the examiners report says Some candidates were able to draw a correct structure for G but many candidates had structures which had carbon atoms with less than four bonds around them and oxygen atoms with just one bond.
does this always have to be the case?

Reply 1

Pigster

Percentage yield was (I guess) removed from the MS after moderation. Being able to discuss both made it too easy to score full marks. Probably.
It doesn't have to be. Just make sure you are clear with you labelling of the two activation energies.

Carbon atoms will always form four covalent bonds and oxygen will always have two. Surely you should know that.

And don't call me Shirley.