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Unofficial Mark Scheme CHEM2 June 2013 COMPLETED

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Reply 40
Avatar for Blobar
Blobar
15
Original post by MathMad
Might be, not so sure though because it only says phosphoric acid in my text book as well.


Yeah I know but I think I seen it in a past paper, just going through them all now just to make sure :P, should've just stuck with Phosphoric acid because I knew it did but exam pressures get to you :P
Reply 41
Avatar for Danny-r
Danny-r
OP
5
You can have conc H2So4
Reply 42
Avatar for Blobar
Blobar
15
Original post by Danny-r
You can have conc H2So4


Thank you :biggrin:

Can you remember which equation it asked for what catalyst you use?
Reply 43
Avatar for Blobar
Blobar
15
M1 concentrated phosphoric acid / conc. H3

PO4
OR
concentrated sulfuric acid / conc. H2
SO4

There we go. Ethene into ethanol.
Reckon grade boundaries would be lower than Jan 13?
Reply 45
Avatar for Blobar
Blobar
15
I would say about the same.
Hmm I think it was slightly harder
Reply 47
Avatar for Blobar
Blobar
15
Original post by braniac_123
Hmm I think it was slightly harder


I do agree actually, I'd say 73 maybe for an A.
Original post by Blobar
I do agree actually, I'd say 73 maybe for an A.


WOW that'd be great but knowing aqa, grade boundaries get higher in June
Reply 49
Avatar for darkred
darkred
20
Original post by Blobar
I do agree actually, I'd say 73 maybe for an A.


Sounds a bit low, don't think it was particularly that challenging. I'd go with 79 like last years tbh.

:emo: so many silly mistakes.
Reply 50
Avatar for Secret.
Secret.
14
Original post by bbb3
Could you have used acidified potassium dichromate to distinguish between the aldehyde and keytone? Aldehyde goes green, keytone no change??



yeah you can
Reply 51
Avatar for Blobar
Blobar
15
Original post by failingatm
Sounds a bit low, don't think it was particularly that challenging. I'd go with 79 like last years tbh.

:emo: so many silly mistakes.


This is why its hard to distinguish grade boundaries, too many varying opinions, most of my school found it pretty hard, some people on here found it hard and some found it a piece of cake.
Reply 52
Avatar for fifaking2
fifaking2
Original post by me0
For the balancing question the ratio was 8 3 8 4

yeah thats right
Reply 53
Avatar for ManoSingh
ManoSingh
Original post by bbb3
Could you have used acidified potassium dichromate to distinguish between the aldehyde and keytone? Aldehyde goes green, keytone no change??


yeah sounds right, thats what i did
Reply 54
Avatar for YWArtist
YWArtist
What was the product that was also formed with an mr of 5000 or summuh?
Original post by YWArtist
What was the product that was also formed with an mr of 5000 or summuh?



I wrote poly(ethene)
Reply 56
Avatar for Huragok
Huragok
I believe the answer to 1)e) was Hydrolysis?
Reply 57
Avatar for YWArtist
YWArtist
Original post by Huragok
I believe the answer to 1)e) was Hydrolysis?


Nah fam its alkyl hydrogen sulfate to a alcohol which is hydration. (I think that's the question you're on about)
Reply 58
Avatar for Huragok
Huragok
Original post by YWArtist
Nah fam its alkyl hydrogen sulfate to a alcohol which is hydration. (I think that's the question you're on about)


Yeah it is, in my notes it's referred to as Hydrolysis.
Reply 59
Avatar for YWArtist
YWArtist
Original post by Huragok
Yeah it is, in my notes it's referred to as Hydrolysis.


No idea, mine says hydration :L I've seen it in a past paper also. Yo what were the 4marks for the extraction question?

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