OCR A2 CHEMISTRY F324 and F325- 14th and 22nd June 2016- OFFICIAL THREAD

Reply 2440

yoda123

15

Original post by calcumm

Did you HAVE to include the Cl- ion on the NH3+ group for the acid hydrolysis question?

the unofficial mark scheme says its optional

Reply 2441

Guarddogbarney

1

Original post by calcumm

Did you HAVE to include the Cl- ion on the NH3+ group for the acid hydrolysis question?

They didnt expect you to any other year so im guessing not

Reply 2442

tomlam

15

Mistakes I made that I know of:

-called "Amide" functional group "Peptide" - 1 mark
-calculated the Mr wrong on the yield question - 2 marks because I didn't write down the Mr I got
-Conditions of forming amine from halide - 1 mark
-Ester bonds probs not shown clearly enough - I wrote the molecule 100% skeletal - 1 mark
-Chiral carbons on tripeptide

idk about anything else but I'm pretty sure I've made other stupid mistakes - I always do. After all, I finished with 25 mins to spare (the woman gave me a funny look like 'you finished already, dickhead?' :wink:

and then I was just reading the incorrect answers I gave like 'you sure that's right' but alas, I'm sure I've done at least meh. Need a B ideally.

(edited 7 years ago)

Reply 2443

tomlam

15

Original post by Guarddogbarney

They didnt expect you to any other year so im guessing not

It's one of those things they'll change on the mark scheme depending on how people performed.
Anyway...
https://www.youtube.com/watch?v=2NBegquhJRM

Reply 2444

username1947027

8

Guys if you got compound F wrong the secondary alcohol being drawn a as pentan-2-ol instead and you use this principle for G and I, how many marks would I lose out of 7?? I got props pic acid correct, ECF?? Please reply

Reply 2445

username1947027

8

Original post by Reg1234567890

Guys if you got compound F wrong the secondary alcohol being drawn a as pentan-2-ol instead and you use this principle for G and I, how many marks would I lose out of 7?? I got props pic acid correct, ECF?? Please reply

*propanoic acid

Reply 2446

yoda123

15

Same, I dont think it's ECF though
I made the same mistake
It wasn't even a hard question which makes it even more frustrating

Reply 2447

jamesgates1

2

Original post by tomlam

Mistakes I made that I know of:

-called "Amide" functional group "Peptide" - 1 mark
-calculated the Mr wrong on the yield question - 2 marks because I didn't write down the Mr I got
-Conditions of forming amine from halide - 1 mark
-Ester bonds probs not shown clearly enough - I wrote the molecule 100% skeletal - 1 mark
-Chiral carbons on tripeptide

idk about anything else but I'm pretty sure I've made other stupid mistakes - I always do. After all, I finished with 25 mins to spare (the woman gave me a funny look like 'you finished already, dickhead?' :wink:

and then I was just reading the incorrect answers I gave like 'you sure that's right' but alas, I'm sure I've done at least meh. Need a B ideally.

Peptide has been allowed in every mark scheme.

Reply 2448

username1947027

8

Original post by yoda123

Same, I dont think it's ECF though
I made the same mistake
It wasn't even a hard question which makes it even more frustrating

I know we're not the only ones:/ so you think we've lost 4 marks?? I think it could be ECF I hope so because if not I have 47/60 don't think that'll be an A :frown:

Reply 2449

sfarquhar0

6

Original post by Reg1234567890

Guys if you got compound F wrong the secondary alcohol being drawn a as pentan-2-ol instead and you use this principle for G and I, how many marks would I lose out of 7?? I got props pic acid correct, ECF?? Please reply

Made exactly the same mistake. Provided you got the carboxylic acid right, I think ECF would give 4-5/7

Reply 2450

TChowdhury28

2

Original post by yoda123

the unofficial mark scheme says its optional

Where can I find the unofficial mark scheme?

Reply 2451

NervousBoy

4

You guys it won't be 50 for an A, more like 48 maximum it wasn't an easy paper looking at everyone's responses and you have to remember that more than 25000 people take this exam all of which don't comment on here😂

Reply 2452

09Srm

1

Can someone send me the link to the unofficial mark scheme?

Posted from TSR Mobile

Reply 2453

lai812matthew

10

Original post by tomlam

Mistakes I made that I know of:

-called "Amide" functional group "Peptide" - 1 mark
-calculated the Mr wrong on the yield question - 2 marks because I didn't write down the Mr I got
-Conditions of forming amine from halide - 1 mark
-Ester bonds probs not shown clearly enough - I wrote the molecule 100% skeletal - 1 mark
-Chiral carbons on tripeptide

idk about anything else but I'm pretty sure I've made other stupid mistakes - I always do. After all, I finished with 25 mins to spare (the woman gave me a funny look like 'you finished already, dickhead?' :wink:

and then I was just reading the incorrect answers I gave like 'you sure that's right' but alas, I'm sure I've done at least meh. Need a B ideally.

-1 first qs
-1 use of nylon
-2 dissolve stitches
-1 hydrolysis of peptides

haha no A* definitely now

Reply 2454

AJtheconfusedcat

1

Original post by yoda123

the unofficial mark scheme says its optional

Who put up the unofficial mark scheme? Could you link it please?

Reply 2455

Rust Cohle

6

Original post by Reg1234567890

Guys if you got compound F wrong the secondary alcohol being drawn a as pentan-2-ol instead and you use this principle for G and I, how many marks would I lose out of 7?? I got props pic acid correct, ECF?? Please reply

Original post by yoda123

Same, I dont think it's ECF though
I made the same mistake
It wasn't even a hard question which makes it even more frustrating

Original post by TChowdhury28

Where can I find the unofficial mark scheme?

Original post by AJtheconfusedcat

Who put up the unofficial mark scheme? Could you link it please?

Mark scheme https://goo.gl/gEi388

Reply 2456

bellabella136

1

lol completely stuffed up on the dissolvable stitches and possibly all the nmr stuff 😂

I did the carboxylic acid thingy too so maybe like 4 marks in that one and I stuffed up the calc in that 7 marker too.

(edited 7 years ago)

Reply 2457

lai812matthew

10

never seen a paper where the very first question cause that great debate lol

Reply 2458

Can't think name

6

Guys how many marks was the 3 chiral carbon question?

Reply 2459

CharleaM

2

Original post by Can't think name

Guys how many marks was the 3 chiral carbon question?

The one where you had to draw it and * the choral carbons? That one was [2] so I'd imagine one mark for the molecule and one for the correct chiral carbons.

OCR A2 CHEMISTRY F324 and F325- 14th and 22nd June 2016- OFFICIAL THREAD

Quick Reply

Related discussions

Latest

Trending

Trending

Articles for you