Aqa chem 4/ chem 5 june 2016 thread

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Reply 1520

Saldudsjen123

Original post by Aerosmith

I'm sure it's the dipeptide too, dw. student room after exams winds me up, I'm not coming on here after an exam again

Tell me about it,I always say I won't come on here after an exam and then I end up doing like every time haha

Reply 1521

Mary_7

Original post by randoms132

did anyone get 0.833 for that
[salt]/[ethanoic acid]
please :-( im pretty sure it was that? Can anyone remember the numbers and stuff?

omg yes i did

Reply 1522

jessyoung

Original post by Mary_7

omg yes i did

I got that but i think they wanted us to do more with it :frown:

So we deffo got 1 mark out of 3 lol. To get that value I found the H+ conc from the pH but couldn't figure out what else to do with that. I deffo lost 11 marks, just hope i didn't make any silly mistakes! ahhhhh and how cheeky was that 9 marker

Reply 1523

jessyoung

I felt like they asked us loads of explanation questions, which we aren't really taught in depth. I don't understand chemistry i just learn it! What else do AQA want from me!!

Reply 1524

perpetua

Predictions for 120ums, A*,A?

Reply 1525

Owensmith16

any idea of grade boundaries from anyone?

Reply 1526

perpetua

Can I say that because the initial rate is greatest the uncertainty is lowest haha🌚

Reply 1527

perpetua

How are the marks allocated for the nine marker

Reply 1528

ravichauhan11

would it be ok to put chromatography instead of distillation for separating the alcohol from the mixture ?

Reply 1529

Mriffin

Original post by Mary_7

omg yes i did

Nope I got 1.2 something because 0.833 was for (acid)/(salt) but it wanted the reciprocal of that

Reply 1530

ravichauhan11

Original post by Fibsy

Hang on, for the zigzag did we have to draw trailing bonds at the ends or were they already there? Didn't notice (didn't notice most things in this paper it seems)

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think they were already there

Reply 1531

samim_s

Guys, wpuld fractional distillation be okay to separate the alcohol? Also why is everyone talking about distinguishing between a haloalkane and acyl chloride and distinguishijg between two enantiomers? Have i missed a complete page of the exam (i hope not)

Reply 1532

ravichauhan11

Original post by Aerosmith

I'm sorry but it was definitely a dipeptide...it didn't exactly look like there were going to be trailing bonds, did it?

but it said section of the polypeptide ( something like that ) so surely trailing bonds?

Reply 1533

HannahC-H

Original post by samim_s

Question 4 was acyl chloride vs ketone with a chlorine in the chain

Reply 1534

lahigueraxxx

For that question about why the carboxylic acid with chlorine is stronger than the other one, instead of putting 'electron withdrawing' I put 'electron receiving' will I lose marks?? :frown:

So annoying, I couldn't think of the word in the exam !!

Reply 1535

jessyoung

Original post by ravichauhan11

but it said section of the polypeptide ( something like that ) so surely trailing bonds?

I definitely saw the word dipeptide

Reply 1536

lishakb97

Original post by jessyoung

I definitely saw the word dipeptide

I definitely thought it said section of the polymer, guess we'll have to see

Reply 1537

lara24

http://www.ipetitions.com/petition/lower-grade-boundaries-for-chemistry-unit-4-2016
Sign the petition guys

Reply 1538

Aerosmith

Original post by lishakb97

I definitely thought it said section of the polymer, guess we'll have to see

Oh my god. they added some bonds and also asked you to draw some in. if you had to draw trailing bonds, they would have to be straight and there was no way you could have drawn straight trailing bonds on that diagram without it looking ridiculous and wrong. ****'s sake. I hate the student room