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AQA AS Chemistry unit 1 resit May 27th 2016

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Guys can someone make an unofficial mark scheme?
Reply 201
Avatar for man i
man i
3
what do you lot think the grade boundaries will be 60 for an A 57 B right?
Original post by Engineerrookie
Similarity is total abundance

Difference is small peaks due to higher energy gun causing double charged ions


could you also say for another similarity that as the same sample was used 3 peaks would be present in the spectra?
It's never been 60 for an A, don't be ridiculous.

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Original post by man i
what do you lot think the grade boundaries will be 60 for an A 57 B right?


thats quite high for a B, youd get as in other chem1 exams with that mark.
Original post by jaymistry233
image.jpeg



The question did state:

State shape|
State bond angle(s)|
i think iv dropped about 15 marks =((((
Original post by jaymistry233
image.jpeg


Under wikipedia 180 is also listed, I think 180, 120. 90 will be in the mark scheme.
Original post by man i
what do you lot think the grade boundaries will be 60 for an A 57 B right?


Highly doubt it. I think either 56-58 for an A
Reply 209
Avatar for riixx
riixx
1
For SF4 i got 120 degrees and 90 degrees for the bond angle. And for the octahedral one which was SF6 i got 90 degrees
Paper was similliar in difficulty to last year due to weird questions and weird answers for the calculations (which I thought where originally wrong but glad I never changed them because by the looks of it they were right) so A will probably be around 56/57/58
I drop an estimated 17 marks. Bein super harsh on my marking. What ums would that be around?
What was the formula for that Allende
Was it thermal cracking also


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Reply 213
Avatar for riixx
riixx
1
For the last question I chose first method because H3PO4 was the only product
I reckon 54-55, this paper wasn't THAT easy.

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I think that was an excellent paper, the only questions I hadn't seen before was the comparison of spectra using a higher energy electron beam (I just said the peak at 27.9 would still be the most abundant and that peaks would be seen at ~14-15 due to the formation of 2+ ions)
Reply 216
Avatar for riixx
riixx
1
Also can anyone remember how many marks the mass question was aftert the ideal gas equation question
Original post by riixx
For the last question I chose first method because H3PO4 was the only product


What did you get for the formula for the Alkene? What about the type of cracking? The ionisation energy difference one was due to paired she'll and repulsion also wasn't it


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Original post by Danny786
What was the formula for that Allende
Was it thermal cracking also


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I put thermal cracking as well :-)
Original post by riixx
For SF4 i got 120 degrees and 90 degrees for the bond angle. And for the octahedral one which was SF6 i got 90 degrees


That's right

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