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

Thats what i thought but basically u need either Hno2 and hcl or nano2 ans hcl

Does anyone remember how many marks the question about hydrolysis with dilute HCl was, and also the question about fermentation of sugars and chemical synthesis?

hno2 doesn't exist in real life you have to make it y yourself

Does anyone remember how many marks the question about hydrolysis with dilute HCl was, and also the question about fermentation of sugars and chemical synthesis?

hno2 doesn't exist in real life you have to make it y yourself

HNO2 does exist in real life, just for very short amounts of time. OCR allows you to just state HNO2 as that is what is forming the Diazonium ion.

yes i mean it is not a natural compound and it is very hard to preserve it you would lose the compound when hcl is too concentrated

Was the first or second structure they asked for the one with m/z 44? (Think i might've swapped them round )

Anyone??

What if I wrote 1 advantage for chemical pesticides and 4 disadvantages..would I still get 5 marks?

I drew the tripeptide with one amide link in the r group and the other with the cooh group will i lose marks?
Also i wrote the equation with NaBh4 as aldehyde + 2(H) = alcohol + OH- because i saw it as acceptable in the reaction machenism for a mark scheme once will i lose marks and also how many mark swas this question?

Thanks.

For the question with HCL is it not NH2+ not NH3+ because the structure was NH so if you add HCL it would turn into NH2+

For the question with HCL is it not NH2+ not NH3+ because the structure was NH so if you add HCL it would turn into NH2+

I can't remember the exact phrasing of the question but did it imply exactly one mole of HCl? Otherwise it would not be incorrect to assume it would form NH3+ as this in reality is what could happen?

For the question with HCL is it not NH2+ not NH3+ because the structure was NH so if you add HCL it would turn into NH2+