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AQA AS Chemistry unit 1 resit May 27th 2016

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Original post by riixx
For the last question I chose first method because H3PO4 was the only product


I chose the first method as the process was a two step process
Original post by riixx
Also can anyone remember how many marks the mass question was aftert the ideal gas equation question


3 i think
Original post by Charco63
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


For CHEM1 the required UMS for an A Is usually 54-56, I think there was some questions that could have easily caught people out there so I think 57 for an A.
Original post by jaymistry233
That's right


Yeah it is, I just assumed since tetrahedral is 109.5, each bond angle lowers by about 2.5 so put 107 which is obviously wrong now


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what did you all draw for the isomers of that alkene?
Original post by Engineerrookie
I chose the first method as the process was a two step process


It was the first method because H3PO4 was the only product meaning 100% atom economy.
Original post by riixx
For the last question I chose first method because H3PO4 was the only product


So did I
what did everyone get for the mass questions which was the 3rd last one the one after the pv=nrt question
all the products went to forming the phosphoric acid meaning it was in theory a 100% yield for the two step process
Original post by Danny786
What was the formula for that Allende
Was it thermal cracking also


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C14H30

Thermal cracking, Cond: High temp (600) and high pressure.
Original post by Ultracrepidarian
what did everyone get for the mass questions which was the 3rd last one the one after the pv=nrt question


It was a large mass, something like 1065kg
Original post by Ultracrepidarian
what did everyone get for the mass questions which was the 3rd last one the one after the pv=nrt question


0.451/0.453 m3 but not sure that is right, checked it over and over and couldn't see why not

And mass of 1065000 something grams
Original post by RME11
C14H30

Thermal cracking, Cond: High temp (600) and high pressure.


Perfect. What about the name of the Alkene it gave us??


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Original post by Bailey2j09
It was a large mass, something like 1065kg


how did you work it out i got 80 something kg
Original post by Charco63
0.451/0.453 m3 but not sure that is right, checked it over and over and couldn't see why not


I got the exact same but it's wrong somehow - everyone else got 0.113


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Original post by Charco63
0.451/0.453 m3 but not sure that is right, checked it over and over and couldn't see why not

And mass of 1065000 something grams


i think i got 0.113 m3 , and then got 80kg for the mass
Is cracking conditions 700kpa or 7000kpa?
Original post by Danny786
Perfect. What about the name of the Alkene it gave us??


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But-1-ene
Original post by Ultracrepidarian
how did you work it out i got 80 something kg


This was the one where you had to convert m3 into dm3 right?
What did u guys get for why do vdw forces exist

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