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

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Better than the first one, still not great though.
Original post by marcobruni98
I think so!


Great :smile:
Original post by rosemondtan
Guys for the propane-1,2-diol question, was the organic product formed in part a a carboxylic acid-ketone combination and for the alternative organic product it's a aldehyde-ketone combination?


I got the aldehyde and ketone but i didnt do the alternative question...left it blank :frown:
Oh and did you guys get -11760 for the ethanol combustion or something
Original post by TheOnlyAngel
I got the aldehyde and ketone but i didnt do the alternative question...left it blank :frown:


The aldehyde and ketone was the alternative I think because it said limiting potassium dichromate?
Such a nice paper imo. Better than paper 1.
It feels like 64 for an A
But I think it will be 60. Mixed reactions from what I have seen.
Everyone in my class found it to be a nice paper.
(edited 7 years ago)
Original post by rosemondtan
Guys for the propane-1,2-diol question, was the organic product formed in part a a carboxylic acid-ketone combination and for the alternative organic product it's a aldehyde-ketone combination?

Yes was confused about this and I put 3{o). Wud be two for reflux for just one o-h but there was another, I'm not sure anyone put 3(0)
Original post by Pentaquark
Such a nice paper imo. Better than paper 1.
It feels like 64 for an A
But I think it will be 58. Mixed reactions from what I have seen.
Everyone in my class found it to be a nice paper.


Super easy in some place, few A grade questions, probably 66 for an A
Original post by Pentaquark
Such a nice paper imo. Better than paper 1.
It feels like 64 for an A
But I think it will be 58. Mixed reactions from what I have seen.
Everyone in my class found it to be a nice paper.


Nice for the new spec.
Why was a thin layer of platinum used to coat the catalyst ?
Also why was the thermometer of enough uncertainty ?
Original post by rosemondtan
Guys for the propane-1,2-diol question, was the organic product formed in part a a carboxylic acid-ketone combination and for the alternative organic product it's a aldehyde-ketone combination?


Yh i put that
Original post by Asad_2015
Yes was confused about this and I put 3{o). Wud be two for reflux for just one o-h but there was another, I'm not sure anyone put 3(0)

I put the alcohol (whatever it was called) plus 3(O) becomes 2H20 plus COOHCOCH3
Original post by tajtsracc
This is what I did

Not sure as the other OH might be able to :s it's secondary , so Keaton's too. And 3(0)
Original post by tajtsracc
This is what I did


Shouldn't the skeleton structure have OH on the end of where you've added your extra sticks?
Original post by smiley444
Why was a thin layer of platinum used to coat the catalyst ?


I said that honeycomb has a large SA and a thin layer wouldnt decrease the SA so the catalyst would still be effective
Original post by tajtsracc
This is what I did


The first one will be oxidised to a ketone though? The secondary alcohol part. And your skeletal structure needs to show the diol! Or else it would be mistaken as a methyl branch
For the second bit i put 5/2(o)
Original post by Metal Warrior
I put the alcohol (whatever it was called) plus 3(O) becomes 2H20 plus COOHCOCH3


Same
What did you all get for the IR spectrum one?

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