OCR A2 CHEMISTRY F324 and F325- 14th and 22nd June 2016- OFFICIAL THREAD

If you quoted the exact range possible, you'd get the marks I'd say

For the question about synthetic vs fermentation, do i have to state that synthetic produces TWO optical isomers?
I just said that synthetic produces a mix of isomers where as the fermentation only produces one.
Also, with the lactic acid dissolving, i only mentioned the OH from COOH Forming H bonds! I completely lost sight of the other OH group. Is this a mark lost?
I felt so confident... coming on here wasnt a good idea!

Points (5) and (7) : does this mean you could actually have chosen any of the fatty acids, as long as you justified it correctly?

Did it matter in which order the peptides were bonded?

For the chromatography question, is the answer not;
Similar compounds will appear in the same spot on the chromatography plate
This is because they have similar physical properties e.g. volatility, adsorption to stationery phase, solubility in mobile phase
The similar physical properties are caused by similar molecular structures and similar functional groups in the molecular structure

nah, i analysed the jan 2013 paper, 90% identical to our 2016 paper.


It will realistically be:

59; MAX
55; A*
51; A
47: B
43; C

PS; this is jan 2013's boundaries :P

I said it "is a mix of two optical isomers" just because on the 2015 paper it said you had to specifically say 4 optical isomers. Then again that may heve been because it stated in the question 25% chance.
And I'm sure for putting -OH you'll get at least one or two marks, one for a functional group and one for hydrogen bonding?
Don't worry about it, people on the student room get it wrong too you know, last year I convinced myself I'd lost 20 marks on the second biology paper because of this site but I hadn't…

It said more likely so I assume it's the saturated one, because the other two may have had cis configuration?


Posted from TSR Mobile

you do notice there are only 4 questions in jan 2013, and 6 for this years. and the hard questions all only appear in this paper.

It said more likely so I assume it's the saturated one, because the other two may have had cis configuration?


Posted from TSR Mobile

If I made the mistake of placing the ketone on the wrong carbon but carried on my error throughout the rest of the question how many marks out of 7 would I get...

I drew the secondary alcohol like this is it right?

you do notice there are only 4 questions in jan 2013, and 6 for this years. and the hard questions all only appear in this paper.

Also I got propanoic acid for compound H, but I didn't show much working out? Will I still get the marks