Edexcel A Level Chemistry 2019 Paper 2 June 11th 2019 Unofficial Mark Scheme

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Original post by kekedoyouloveme?

circled the ester then i did a circle within a circle then i got pissed and just mad circled it so the examiner is gonna be like wtf is she circling?
i said it was the ch3 near the ester, ester is a singlet and the relative area was 3 so it had like 3 hydrogens and it was next to an ester which didnt split...

The benzene ring is a singlet

Reply 181

Stresss

What’s going to be on the paper today

Original post by Munrhe

Ah, I thought we had to do the whole flavanol structure and somehow make an Easter out of it

Reply 182

mildhan

Original post by Cheesus69

what about ethanal if the ethanol doesnt completely oxidise

Aldehydes are more easily oxidized than alcohols, so I’d assume that if ethanol was oxidized to ethanal, it would immediately be oxidized to ethanoic acid.

Reply 183

D.Duck

what was the answer to the one where it said why does k increase as a catalyst is added

Reply 184

azozarmen

Yeah, an ester would result in a COOH group and an OH group, an ether would result in 2 OH groups

Original post by RickHendricks

bruh that was an ether not an ester lol

Reply 185

DragonsOfAsshai

Original post by D.Duck

what was the answer to the one where it said why does k increase as a catalyst is added

I said lower Ea increases lnk, as seen from arrhenius equation, meaning k increases

Reply 186

Yẽncgf

How about k is proportional to rate, hence rate increase means k increases ?

Reply 187

RickHendricks

Original post by DragonsOfAsshai

I said lower Ea increases lnk, as seen from arrhenius equation, meaning k increases

Original post by Yẽncgf

How about k is proportional to rate, hence rate increase means k increases ?

yes and yes

Reply 188

lowkeyasian

we're thinking in the same way!!!! i got a trial and diol!!!! and that was what my chemistry teacher thought first when he first saw the question!! i knew it's not right because the smell defi is for ester but the qs says what 'could' form, so i'd say we can get 1-2 marks somehow!!!

Original post by azozarmen

For the flavan-3-ol question I got ethanoic acid, ethanal (although it is immediately oxidised), flavyl ethanoate, a flavyl triol (don't know how to name it) and a few different esters based on the triol. Sound correct?

Reply 189

lowkeyasian

and my teacher said some ether does have sweetish smell but not rlly describing as fruity smell.
anyways finger crossed that we can get some marks!!!

Original post by azozarmen

Yeah, an ester would result in a COOH group and an OH group, an ether would result in 2 OH groups

Reply 190

Sum Mmed

i wrote as catalyst provides alternate path with low activation energy , so more particles have energy equal or more to Ea so more successful collision per unit time , rate increases and as k and rate are directly proprtional k also increases.

Original post by D.Duck

what was the answer to the one where it said why does k increase as a catalyst is added

Reply 191

Kategrinding

My teacher said there was something like enantiomers included it but I found your answer more reasonable.

Reply 192

Stormragexox

Original post by Kategrinding

My teacher said there was something like enantiomers included it but I found your answer more reasonable.

for what question?

Reply 193

laca123

what kind of shape did people get for the graph? Bit late but i was thinking about it and i think i did it wrong mine was a straight line from bottom left to top right

Reply 194

Beamomom

How are you guys revising for paper 3?

Reply 195

Beamomom

Think mine started from the top left and finished in the bottom right.

Original post by laca123

what kind of shape did people get for the graph? Bit late but i was thinking about it and i think i did it wrong mine was a straight line from bottom left to top right