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OCR A Chemistry Paper 2 Unofficial Mark scheme Watch

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    (Original post by DeanPauww)
    I used a melting point test instead of chromatography?
    it was a solid therefore how u gonna do chromatography lmao it was melting point apparatus m8y
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    (Original post by eryk_laroche)
    it was a solid therefore how u gonna do chromatography lmao it was melting point apparatus m8y
    Yeah thats what I though
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    (Original post by DeanPauww)
    I used a melting point test instead of chromatography?

    I believe chromatography wasn't necessary. I put filtration under reduced pressure followed by recrysalisation. Didn't it want to know how to purify it?
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    What was the answer to the multiple choice about 0.1 mol and 0.1 mol makes how many atoms?
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    for the purification question (6 marker), I forgot to write about checking for the melting point to check the purity of the compound, but i wrote everything else and got a percentage yield of 71. Would i at least get 4 marks?
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    (Original post by Tuffyandtab)
    I believe chromatography wasn't necessary. I put filtration under reduced pressure followed by recrysalisation. Didn't it want to know how to purify it?
    Yeah but it also asked how you would check the purity so I said do a melting point test and compare to a known value and do percentage difference
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    (Original post by eryk_laroche)
    it was a solid therefore how u gonna do chromatography lmao it was melting point apparatus m8y
    Oh yeh lol but I swear u can still do chromatography with dabs of solid
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    (Original post by Shahani)
    for the purification question (6 marker), I forgot to write about checking for the melting point to check the purity of the compound, but i wrote everything else and got a percentage yield of 71. Would i at least get 4 marks?
    sorry but since its levelled responses and u mentioned nothing about how to purify it you might just get 2
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    (Original post by PeterCrabtree)
    There was, the first peak was RC-O
    that was for the last question, there wasn't one for the previous question with the aromatic ring i don't think
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    (Original post by DeanPauww)
    Yeah but it also asked how you would check the purity so I said do a melting point test and compare to a known value and do percentage difference
    I must have not read that part. darn it!
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    (Original post by AB199)
    Oh yeh lol but I swear u can still do chromatography with dabs of solid
    not too sure i need to go over tlc lmao but u could be right :f
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    Was the condensation polymer degradable because of hydrolysis/photolysis
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    (Original post by DeanPauww)
    Was the condensation polymer degradable because of hydrolysis/photolysis
    Yeah I did a past paper a few days ago and that was the answer for a similar question
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    (Original post by AB199)
    Yeah I did a past paper a few days ago and that was the answer for a similar question
    Had no clue where to get 3 marks from ahaha
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    (Original post by eryk_laroche)
    sorry but since its levelled responses and u mentioned nothing about how to purify it you might just get 2
    I wrote about recrystallisation and filtration just forgot to say to check the melting point. would that still give me 2 ?
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    With the flowchart question with the hyrdoxynitrile, did people put CHOH for the beginning molecule (The one what was reacted with NaCN/ H+)
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    (Original post by AB199)
    Yeah I did a past paper a few days ago and that was the answer for a similar question
    id imagine 2 marks were for finding the polymer and 1 mark for saying hydrolysis of ester bond is easy in the environment
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    (Original post by Shahani)
    I wrote about recrystallisation and filtration just forgot to say to check the melting point. would that still give me 2 ?
    Dunno bro but they might put u in band 2 for not talking about how to find purity so max 4 marks me thinks
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    what where the two other structural isomers for 3-bromophenylamine ? and what did you say about why there were isomers formed?
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    For those who got an aromatic ring in the last question:

    How can you when there were no aromatic protons in the 7ppm area?
 
 
 
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