so random that we had to indicate which isomer we were using of Cl. I just wrote it at the top like a mass number but so many questions like that had weird formats and threw me off because i wasn't used to it :frown:

the hydrogen bonding really threw me as well for some reason

what did people put for the chloroethanoic acid being a stronger acid? i wrote something about electronegativity at the last minute

Reply 985

emilysimpspoon

Original post by Seclusion

2.38 and 2.32 for two of them, forgot which way around tho.

I think the dilute one was the lower pH and then the one with NaOH was higher, unless I'm remembering the question completely wrong now.

Reply 986

Stevesteve12

Original post by Rabadon

o-ch2 was a triplet :/

thanks anyway

Reply 987

FireBLue97

cl negative weakens oh bond

Reply 988

Jessie253

Original post by idk97

am i the only one that got 8 for the carbon nmr ? :frown:

i got 8 too

Reply 989

Fibsy

What do you think for an A?

Posted from TSR Mobile

Reply 990

Capsicle102

Original post by RME11

The polyester polymer was stronger due to permanent dipole-dipole being a stronger IMF between chains than the polypropene's VDW forces - which is why it is better for stitches.

Interesting. It asked for why the PCG or whatever it was was better though. I put that the PCG thing had polar ester bonds, so was susceptible to attack by nucleophiles such as water, naturally occurring in the body, and this means the stitches will break down as the wound heals, so patients don't have to go back to the doctors to get stitches removed

Reply 991

FireBLue97

low ph was +NH3 not COOH or the other COOH trick question funny lol aqa

Reply 992

HannahC-H

Did anyone else get this for the structure in qu. 9? Qu.9.jpg

Reply 993

ahlam H

Original post by Anam

What was everyones equation for the fragmentation question? I put 35 next to the cl in the fragment ion and 37 next to the cl radical is that right?

I got that :smile:

I also got 112 for the m/z value

Reply 994

randoms132

I pretty sure it was 8 peaks for that c13 nmr question!

Reply 995

Ben-Jam-In

Original post by RME11

The polyester polymer was stronger due to permanent dipole-dipole being a stronger IMF between chains than the polypropene's VDW forces - which is why it is better for stitches.

I said the PGA was biodegradable, so can be used for dissolvable stitches whereas the other would need to be removed by a nurse, plus I guess they could be used for internal stitches where you need the stitch to dissolve so you don't have to go back in and remove the stitch

Reply 996

j5994

someone please make an unofficial markscheme or post pictures of the paper coz i need to know how many marks i need in CHEM5 to bring my grade up to an E :'(

Reply 997

Capsicle102

Original post by goldenrs12

the hydrogen bonding really threw me as well for some reason

what did people put for the chloroethanoic acid being a stronger acid? i wrote something about electronegativity at the last minute

There was a question like this in a previous paper in which the mark scheme answer was:
- Chlorine is more electronegative
- Chlorine draws electron density towards itself
- OH bond is weaker