AQA AS Chemistry 7404/1 and 7404/2 - 27th May 2016 and 10th June 2016

Reply 740

Blazey

1

Original post by SANTR

What did people get for the infra red question, on which bond is used to distinguish between the compounds?

I think I put the C=C double bond.

Reply 741

ICantFindMyName

1

Original post by Gswp

People need to stop comparing new spec to old spec

They would have left a blank space. They left a blank space for damn near everything - even 'working' for the last question where you had to draw the graph.

If they wanted you to draw there would have been a blank space. End of.

AQA would be trolling if they wanted the diagram tho...

I bet you money you are wrong.

Reply 742

zigocarn

8

Original post by Blazey

I think I put the C=C double bond.

Really hope we are right.

Reply 743

GabbytheGreek_48

11

Original post by Pentaquark

Oxidation of propane-1,2-diol
(2)

CH3CH(OH)CH2OH + 3[O] →
CH3COCOOH + 2H2O

Just found a past AQA question in an A2 paper. Ffs i didnt balance :s

yeah meanwhile i balanced it but didnt put enough oxygen because it was a stupid diol :'(

Reply 744

Splaffie

2

Original post by zigocarn

I said you used the c=c to distinguish :frown:

What was it meant to be?

I think it was supposed to be o-h and alcohol but in reality it was a hydroxyalkene but I wrote alcohol

Reply 745

GabbytheGreek_48

11

Original post by zigocarn

I said you used the c=c to distinguish :frown:

What was it meant to be?

they will probably give that as well but didnt both alcohol and aldehyde have a c=c bond?idr

Reply 746

LoyaltyAb0veAll

16

Original post by Blazey

I think I put the C=C double bond.

it was o-h ( alcohols ) - i am pretty sure

Reply 747

Blazey

1

Original post by zigocarn

Really hope we are right.

Haha, hopefully. I completely failed the first paper so need a decent mark on this one. :smile:

Reply 748

Splaffie

2

Original post by GabbytheGreek_48

yeah meanwhile i balanced it but didnt put enough oxygen because it was a stupid diol :'(

Ah crap I forgot to add waters

Reply 749

DaVinciGirl

15

Hey, I'm making the mark scheme and got this so far. Any help would be great!
http://www.thestudentroom.co.uk/showthread.php?t=4156405&p=65645255#post65645255

Reply 750

zigocarn

8

Original post by GabbytheGreek_48

they will probably give that as well but didnt both alcohol and aldehyde have a c=c bond?idr

No, the aldehyde had a C=O and not a C=C?

Reply 751

quinn f

4

Original post by GabbytheGreek_48

they will probably give that as well but didnt both alcohol and aldehyde have a c=c bond?idr

there wasn't a peak for C=C I checked, I think it was O-H

Reply 752

Turtlebunny

17

I think grade boundaries will definitely be lower than any boundary on the old spec, for sure, so don't worry too much guys. After all, these were harder than usual exams, more to do, in less time, they contained practical elements in the exams, instead of ISA's which people got high grades on almost every time. They also had a lot of hard maths questions and the multiple choice was an easy way to waste time and lose marks.
Well done to all :smile:

We've all worked super hard.

Reply 753

Applicant75235

12

anyone done an unofficial mark scheme?

Reply 754

GabbytheGreek_48

11

Original post by quinn f

there wasn't a peak for C=C I checked, I think it was O-H

yeah i put o-h but there was a slight drop so i see where the ppl who put c=c are coming from

Reply 755

Gswp

7

Original post by ICantFindMyName

I bet you money you are wrong.

tbf they might accept both ways but wtf aqa...

Reply 756

zigocarn

8

Original post by Gswp

People need to stop comparing new spec to old spec

They would have left a blank space. They left a blank space for damn near everything - even 'working' for the last question where you had to draw the graph.

If they wanted you to draw there would have been a blank space. End of.

AQA would be trolling if they wanted the diagram tho...

The reason they gave lines is because there was two parts to the question. One required an explanation and hence lines were given.

(edited 7 years ago)

Reply 757

Splaffie

2

Original post by quinn f

there wasn't a peak for C=C I checked, I think it was O-H

There was a peak at 1620-1680 signifying a c=c bond, however in terms of actual functional groups it was an alcohol

Reply 758

hasbro7

Hey guys. I believe for the thin layer catalyst question, it was so that the gases produce can diffuse easily out of the engine- but not sure once again and there could indeed be multiple answers. For the reason about the data book value being different- I think either the heat capacity of the copper calorimeter isn't included OR water is formed in the gaseous state should be enough to get the mark.