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A2 Edexcel Chemistry Paper 3 20th June 2018 Unofficial Markscheme

Unofficial ms?

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Ar at carbonate question 27.04 metal magnesium
Kc=13.6
Got Mg aswell, 4.01 or something for ph of buffer.
Reply 3
pH is 4.04?
Original post by Kwokho F
pH is 4.04?


Yah got that
what was the TMS one
Original post by Kwokho F
pH is 4.04?

Ye something like that.
is it just me or did you guys struggle to finish? I didnt have time to finish and missed like 10 marks
Reply 8
What was the answer to the VO3 catalyst question in the Contact Process?
Reply 9
Original post by iiamscarzii
what was the TMS one


1. Have it’s own signal away from others
2.have low b.p. so can be easily removed and collected every time
did everyone finish the paper?
Original post by iiamscarzii
what was the TMS one


Produces strong peak as there are many H and C with the same chemical environment and peak is far upfield/ far to this right as both C and H are highly shielded by electrons.
Reply 12
Anyone got 3.something for kc?
Reply 13
What did people get for the organic synthesis one? I wrote addition elimination to hydroxypropanenitrile, then did acidic hydrolysis of that?
Original post by glitter73
is it just me or did you guys struggle to finish? I didnt have time to finish and missed like 10 marks

Same here
Original post by Padi97
What did people get for the organic synthesis one? I wrote addition elimination to hydroxypropanenitrile, then did acidic hydrolysis of that?


Idk what i did i made a hydroxynitile then added 2h2 and something to make a carboxylic acid
Original post by Padi97
What did people get for the organic synthesis one? I wrote addition elimination to hydroxypropanenitrile, then did acidic hydrolysis of that?


I did that :smile:
Reply 17
Original post by roxy100
What was the answer to the VO3 catalyst question in the Contact Process?


v2o5 ?
Reply 18
anyone get kc= 5.36 ?
Original post by Unknown123321
Got Mg aswell, 4.01 or something for ph of buffer.


Wtf I got strontium lol.

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