Edexcel A2 Chemistry Exams -6CH04 (14th June) and 6CH05 (22nd June) Discussion Thread

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Reply 960

petraaa

It didnt require knowing what a palm oil formula is. The alcohol is glycerol/propane-1,2,3-triol.

CH2OH
I
CHOH
I
CH2OH

Reply 961

Ayman!

Sounds like the UK paper was somewhat similar to our IAL. Hope everyone was okay - onwards to unit 5. :smile:

Reply 962

krishanj

Did anyone remember what they got for multiple choice? i think i got DDDCADCACBBDABBABBCA

Reply 963

Peppercrunch

That was a very nice paper.

Bit of a trick question about the observation when the thiosulfate ions are used up - quite a few people I know said blue/black to colourless (wrong way around I believe).

Reply 964

lfcrules

Would it be ok if I said the strsch turns blue black , nothing about colourless to blue black

Reply 965

krishanj

Original post by lfcrules

Would it be ok if I said the strsch turns blue black , nothing about colourless to blue black

I think so, it was only one mark if i think

Reply 966

MacroniCheese

Original post by lfcrules

Would it be ok if I said the strsch turns blue black , nothing about colourless to blue black

Should alright hopefully, Edexcel aren't too harsh in Mark schemes. That's what I put anyway :smile:

.
Nonetheless a pretty straightforward paper despite having a couple of oddball questions. Hope everyone found it alright! Unit 5 to go!!

Reply 967

Cpj16

Methyl secondary alcohols will give a positive result as well
It was w and z

Reply 968

chemica

my thought exactly! I need an A #byebyeuni

Reply 969

CLGC98

What was the answer for thr final question??? Abiut ir spectrum??

Reply 970

WashingPowder

This is the pH Curve roughly i believe

Reply 971

crimson1234

What were the three differences you guys put for acid/alkali hydrolysis. And what 2 bonds did you say we're different for the last bit on the nmr question

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Reply 972

jess.olo

what did people get for the first question - ph and concentration for h2s!??

Reply 973

C0balt

Original post by CLGC98

What was the answer for thr final question??? Abiut ir spectrum??

It was either absence/presence of C-Cl, C-O, H-O or value for c=o being different

Reply 974

Don Pedro K.

Original post by C0balt

It was either absence/presence of C-Cl, C-O, H-O or value for c=o being different

I talked about it in terms of COCl and COOH groups. Is that alright do you think because in the question it said wavenumbers for relevant bonds or groups involved?

What wavenumbers did you use btw?

Reply 975

RUNSran

Original post by WashingPowder

This is the pH Curve roughly i believe

Yeah I did this as well but I believe the graph should start from 1.5 as that was the ph of H2SO4

(edited 7 years ago)

Reply 976

lfcrules

What did you guys get for the total entropy change and what was the answer for how would you twllnif the acid was in excess. Also for the difference between the two hydrolysis types I mentioned equilibrium and salt formation , any ideas for the third difference ?

Reply 977

jess.olo

Original post by C0balt

It was either absence/presence of C-Cl, C-O, H-O or value for c=o being different

I said there would be OH for the phenol group in both but for the carboxylic acid group AS well there would be a different OH bond absorption as well?

Reply 978

CLGC98

Original post by C0balt

It was either absence/presence of C-Cl, C-O, H-O or value for c=o being different

I just said salicylic acid had a sharp peak at he wavenumber for C=O in carboxylic acid ( dont remember the wavenumber)
Amd said had a peak for the acyl chloride group