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OCR A-level Chemistry A Paper 2 - 16th June 2025 [Exam Chat]

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Unofficial Mark Scheme

Post the answers you remember after your exam — our AI assistant will use them to build a live Unofficial Mark Scheme, based on real student responses.

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Good luck!

Reply 880

Original post
by yam11
It couldn't be, otherwise there would have been two broad singlet peaks with a peak integration of 1 on the proton NMR spectrum.


oh lol icl i just didn’t know it had to be broad for OH i never remember learning that but oh wellll

Reply 881

Original post
by jessatkinson
oh lol icl i just didn’t know it had to be broad for OH i never remember learning that but oh wellll

Don't worry too much, paper 3 still to go! Hopefully it will go well.

Reply 882

Original post
by yam11
Don't worry too much, paper 3 still to go! Hopefully it will go well.


Thank you, good luck for your paper 3! Tbf the rest went well i think so hopefully it should even out (fingers crossed haha)

Reply 883

Can anyone help me… I’m so confused when are u meant to round ur intermediate numbers in calculations cos every mark scheme is diff my teacher said to always round to min 4SF but some mark schemes don’t round at all and them some do pls help😔😔😔😔😔😔😔

Reply 884

Original post
by Tk2007
Can anyone help me… I’m so confused when are u meant to round ur intermediate numbers in calculations cos every mark scheme is diff my teacher said to always round to min 4SF but some mark schemes don’t round at all and them some do pls help😔😔😔😔😔😔😔


If they want a specific sig fig they let you know in the question, but I think 2/3 sig fig is fine

Reply 885

Original post
by Maya lallzz
If they want a specific sig fig they let you know in the question, but I think 2/3 sig fig is fine
Ty the paper 2023 p3 mark scheme is so confusing why are there 3 diff answers allowed

Reply 886

In the MCQ was the NH protonated to NH2 or NH3+? (I put NH3+)

Reply 887

Original post
by ems1213
In the MCQ was the NH protonated to NH2 or NH3+? (I put NH3+)

yeah i did that as well, B i believe. I was doubting betwen B and C so muchhh

Reply 888

Original post
by ems1213
In the MCQ was the NH protonated to NH2 or NH3+? (I put NH3+)


In an acid hydrolysis or alkali hydrolysis? If it was an acid it should be NH3+ but if alkali it should be nh2

Reply 889

Does anyone have any advice on what to revise for tomorrow's Paper 3?

Reply 890

Original post
by Abdcd
Does anyone have any advice on what to revise for tomorrow's Paper 3?


transition elements most likely going to be a 6 marker, pv=nrt, Hess cycles, born haber cycles, titrations, kc.

Reply 891

Original post
by Masrooler
In an acid hydrolysis or alkali hydrolysis? If it was an acid it should be NH3+ but if alkali it should be nh2

It’s so stupid I picked C , because in acid hydrolysis 4 markers it accepts nh2 and nh3+.

Reply 892

Original post
by yoski2
It’s so stupid I picked C , because in acid hydrolysis 4 markers it accepts nh2 and nh3+.

i think most ppl would have been caught out and probably picked C but i knew it was B though and like neareer to the end i just had extra time to look over my work and was doubting myself but yeah the answer was B. Dont worry it was only 1 mark

Reply 893

Original post
by incidental-ruse
transition elements most likely going to be a 6 marker, pv=nrt, Hess cycles, born haber cycles, titrations, kc.

what specifically on transition metals tho?

Reply 894

The thing about paper 1 is it is more inorganic than organic and lowkey i would prefer organic but the organic they give is unfamilair stuff soo

Reply 895

Original post
by Jennifer2314
i think most ppl would have been caught out and probably picked C but i knew it was B though and like neareer to the end i just had extra time to look over my work and was doubting myself but yeah the answer was B. Dont worry it was only 1 mark
They have to accept both coz they accept nh2 in markschemes. They can’t pick and choose

Reply 896

What question was the mass of Br2

Reply 897

Original post
by yoski2
They have to accept both coz they accept nh2 in markschemes. They can’t pick and choose

yeah but they give fewer marks for nh2 than for nh3+, if you're thinking of the amide hydrolysis process. The multiple choice is a different case entirely.

Reply 899

https://www.change.org/p/lower-a-grade-boundary-for-ocr-a-a-level-chemistry-2025
Everyone sign this petition so grade boundaries aren’t effed
(edited 9 months ago)

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