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WJEC Chemistry CH4 - Wed, 12th June 2013 Discussion Thread!

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Reply 20

manton333

what mechanisms are we meant to know?

Reply 21

VSEPR

Nucleophilic addition(-elimination) and substitution, and electrophilic add/sub.

Free radical from AS.

Also napthalene-2-ol came up in Jan! So sneaky but it was in the revision guide... It forms a RED azo dye. Phenol is yellow.

Reply 22

x_leah27_x

How did everyone find it? I thought it was considerably harder than past papers.

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Reply 23

VSEPR

Original post by x_leah27_x

How did everyone find it? I thought it was considerably harder than past papers.

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That one about the isomer (molecules L and M) blew me; I had to rush the rest of the paper but just finished in time after furiously scribbling a 4-chlorobenzoic acid molecule and 35Cl and 37Cl. Hope it gets the marks!

Reply 24

DottyEm

Thought overall it was okay! :smile:

Only things that threw me were 5)b) where we had to find L and M and then the maths part of question 3, but otherwise it was alright

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Reply 25

Picksel8

Anybody else get 1 for the number of moles present of water in that molecule?

Reply 26

lukejb

Yeah I had 1 too

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Reply 27

rach-ell

Original post by Picksel8

Anybody else get 1 for the number of moles present of water in that molecule?

I did!!

Sorry I'm slightly relieved someone else had the same answer to me, I spent about 15 minutes staring at that question trying to figure out how to answer it :P

Reply 28

lukejb

I left it when I first saw it and thought there was no way I was going to answer i, got there in the end though!

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Reply 29

Picksel8

Original post by rach-ell

I did!!

Sorry I'm slightly relieved someone else had the same answer to me, I spent about 15 minutes staring at that question trying to figure out how to answer it :P

Good good, it looked harder than it was to be fair, was just a case of getting the relevant information out of that ridiculously large paragraph!

The molecule M, what did people get? I had something like

CH3-CH2-CO-NH-C6H5-NH2

I think I may have remembered what i put down wrong though, it was something like that

Reply 30

DottyEm

I didnt get 1 because my Mr came out as 0.84 for some reason which was obviously wrong! but couldn't figure out where I'd gone wrong :frown:

My friend got 1 though :smile:

Reply 31

Picksel8

The opening question was probably the hardest opening question on a CH4 paper I've done to be fair

Reply 32

lukejb

Yeah was quite a hard paper

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Reply 33

VSEPR

I thought using the Derby vodka thing was quite funny for a rationale; it was a good question though - 2methylpropan-2-ol?

n=[210-(6x12+8x1.01+7x16)]/18.02 or something like that giving 0.99 which rounds to 1.