A-level Paper 2 OCR chemistry 2019 11th June unofficial mark scheme

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Poll: How many marks did you get?
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14.41%
75-79 (239)
12.75%
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11.31%
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8.27%
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3.79%
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10.99%
12kayase
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Click here to see a more or less complete list of answers:
https://www.thestudentroom.co.uk/showthread.php?t=5996056&page=17 #post83874932



22.5 grams required for synthesis (first 6-marker)

24,018 g mol^-1 for the M_r of the polymer

R_f value of 0.33 (possibly 0.35)

Molecular formula of C10 H12 O2 (second 6-marker)
Structure: CH3 Benzene Ring CH (CH3) COOH

https://imgur.com/nm7XVsX

Glycine for the TLC

R group - Mr 57 - Leucine for the amino acid

Condensation polymer and addition polymer

Movement of a pair of electrons - curly arrow

Stereoisomer- same structural formula different spatial arrangement




splitting pattern: triplet, triplet, quartet, triplet
synthetic routes with H+ and OH- break ester bond for both! with OH- remove the H to get O- for product. reaction is hydrolysis.
Benzene and Kekule: kekule has localised electrons as benzene delocalised. Both have p orbitals forming pi system. Then draw 3d structure
Differences of benzene and kekule: benzene less exothemic than expected as delta H is different than expected, all carbon carbon bonds same length and C=C (short) and C-C (long), doesnt undergo addtition
Last edited by RedGiant; 1 year ago
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Hooper902
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Impossible
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12kayase
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that 7 marker flow chart was HORRENDOUS
(Original post by Hooper902)
Impossible
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Aradini
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I didn't do too well.
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Sara saeed
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What did people get for mass of the 6 mark question
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onlyangel7
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(Original post by Sara saeed)
What did people get for mass of the 6 mark question
22.5g
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Hcst
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3.4
I am not sure

I am totally wrong sorry
(Original post by Sara saeed)
What did people get for mass of the 6 mark question
Last edited by Hcst; 1 year ago
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lucieprior2001
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(Original post by Sara saeed)
What did people get for mass of the 6 mark question
22.5g
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seadventure
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(Original post by Sara saeed)
What did people get for mass of the 6 mark question
22.5g
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hmjw
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(Original post by onlyangel7)
22.5g
Agreed
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seadventure
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(Original post by 12kayase)
how did everyone find it ?
thought it was fine
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akhan2687
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Leucine for the amino acid
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Gc31
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What structure did people get on the final 6 marker? Did it matter about the positions on the benzene ring because it didn't give us carbon NMR??
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onlyangel7
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The first exam I’ve come out of from the 5 I’ve had so far and not wanted to cry so that’s a positive 🙏
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Sara saeed
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(Original post by onlyangel7)
22.5g
Yes yes yes
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Sara saeed
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Was there an mcq with 2 same priority groups? What did people write was it’s stereoisomer
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hmjw
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Z (which was option D)
(Original post by Sara saeed)
Was there an mcq with 2 same priority groups? What did people write was it’s stereoisomer
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Hcst
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Glycine for the Rf calculations
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luketprg
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CH3-C6H4-CH(CH3)COOH for NMR methyl group then Benzene ring then carbon with methyl group, hydrogen and Carboxylic Acid group attachced
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sotor
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(Original post by Gc31)
What structure did people get on the final 6 marker? Did it matter about the positions on the benzene ring because it didn't give us carbon NMR??
yeah it didn't matter and it also said "give ONE of the structures" to account for that
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