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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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Reply 780

Skye123eliz

For the 7 mark box question did it matter if it was in skeletal or displayed?

Reply 781

clairesgloss

I guess i read the amino acid question wrong cuz i just drew the amino acids with different R groups. Because the question said write structures of amino acids.

Reply 782

Ninjalester

Original post

by Skye123eliz

For the 7 mark box question did it matter if it was in skeletal or displayed?

Usually they allow both???

Reply 783

clairesgloss

Original post

by Skye123eliz

For the 7 mark box question did it matter if it was in skeletal or displayed?

Its allowed

Reply 784

Skye123eliz

Original post

by Ninjalester

Usually they allow both???

I thought they did- just couldn’t remember if they asked for a specific type in the question??

Reply 785

Skye123eliz

Original post

by clairesgloss

Its allowed

Skeletal or displayed? Because I did displayed

Reply 786

Glaurung

Meta director is allowed on ocr mark schemes right?

Reply 787

ks_xx

Original post

by clairesgloss

I guess i read the amino acid question wrong cuz i just drew the amino acids with different R groups. Because the question said write structures of amino acids.

so did i.. were we not meant to? i thought it was polymerisation between the two amino acids using the Rf values 😭

Reply 788

1Thinking

Original post

by themonke

Sorry 😭 I sent the wrong link
https://docs.google.com/document/d/1TejPW0neSW-3w-u1CEmoqMIGG4kv9--uoySW8rNMoUA/edit?usp=drivesdk

Was it not 2methly not ethyl for the first question and the second was 6carbon chain for both and not c7?

Reply 789

username7156417

Original post

by 1Thinking

Was it not 2methly not ethyl for the first question and the second was 6carbon chain for both and not c7?

i got this too

Reply 790

1Thinking

If it was ethyl on a second carbon in the chain it won't be pent it'd be hex so yeah should be methyl

Reply 791

Unrei

Original post

by david02932412

it is 3,5 directing withdrawing group, check online, i believe it was a ch3 with no2, ch3 on the second one so it couldnt, it has to be 3 or 5,

I think you miss understood them, they said they only put 3 directing and not 3,5 directing, they are still correct because 3 and 5 carbon would be the same in mono substitution

Reply 792

Unrei

Original post

by 1Thinking

Was it not 2methly not ethyl for the first question and the second was 6carbon chain for both and not c7?

Yh the unofficial MS is showing why it is unofficial, so many things are wrong on that document which is fair because how would you remember especially in the multiple choice

Reply 793

1Thinking

Original post

by Unrei

Yh the unofficial MS is showing why it is unofficial, so many things are wrong on that document which is fair because how would you remember especially in the multiple choice

But saying 2ethly is just plain wrong, I'm sure someone would've noticed that would end up making a hex and not a pent

Reply 794

Unrei

Original post

by 1Thinking

But saying 2ethly is just plain wrong, I'm sure someone would've noticed that would end up making a hex and not a pent

Uh I don’t really know what you want me to say, I didn’t make the document, it is wrong but how do you want me to explain a mistake somebody else made… I don’t know why they didn’t notice

Reply 795

1Thinking

Original post

by Unrei

Uh I don’t really know what you want me to say, I didn’t make the document, it is wrong but how do you want me to explain a mistake somebody else made… I don’t know why they didn’t notice

I didn't want you to explain, I originally said to the person who shared the link in hope they might be able to find the way to change it

Reply 796

Jennifer2314

hey guys, i dont know if this was discussed already so sorry for bringing it up if it was discussed. The question where we had to find the Rf value and draw amino acid where we meant to

•

draw the two amino acids with the R group we found

•

Or draw liek a peptide bond reaction with the r grouop it self

If it is was the second option can someone expalin how they came to that conclusion bc im pretty sure it asked to draw an amino acid so i just did that

Reply 797

ikunim

Original post

by david02932412

i think i got the first two so 1 and 2, please let me know if im correct

pretty sure it was just the first one as the second one actually only had 2 carbon environments because 2 lines of symmetry

Reply 798

Unrei

Original post

by Jennifer2314

hey guys, i dont know if this was discussed already so sorry for bringing it up if it was discussed. The question where we had to find the Rf value and draw amino acid where we meant to

•

draw the two amino acids with the R group we found

•

Or draw liek a peptide bond reaction with the r grouop it self

If it is was the second option can someone expalin how they came to that conclusion bc im pretty sure it asked to draw an amino acid so i just did that

A peptide bond is an amide link right? If it is, it was because in the question they said that the molecule is formed from two amino acids being joined together. So it was a dipeptide. Before I continued with the question I drew out the structure of two amino acids linked together, without knowing that is what I will be asked to do later, because I wanted to better visual it. And then I continued with the question, and discovered the R groups. Does that explain it properly?