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A-Level OCR Chemistry B (Salters) 2017

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Reply 40
Avatar for maya_vv
maya_vv
9
How did people find the exam ???
Reply 41
Avatar for maya_vv
maya_vv
9
I am so ****ed there's no way I'm going to uni with that paper
Other people in my year thought it was ok?
Original post by maya_vv
I am so ****ed there's no way I'm going to uni with that paper
Other people in my year thought it was ok?


Same here
I much preferred the specimens but overall it was okay
Reply 44
Avatar for Ed5
Ed5
14
I really hope the grade boundaries will be low
Reply 45
Avatar for hazpike
hazpike
2
The last 6 marker was ridiculous. And the one about tests for barium, lead and iron seems impossible, even now. A couple of marks were nice but overall it just went straight over my head...
What did everyone get for the hess cycle one?
Reply 47
Avatar for Cargos
Cargos
1
Honestly not too bad? comparing it with the awful biology at least
Original post by hazpike
The last 6 marker was ridiculous. And the one about tests for barium, lead and iron seems impossible, even now. A couple of marks were nice but overall it just went straight over my head...

What last 6 marker the one about water of crystallisation?
Original post by hazpike
The last 6 marker was ridiculous. And the one about tests for barium, lead and iron seems impossible, even now. A couple of marks were nice but overall it just went straight over my head...

The one for barium wasnt that just NaOH, barium sulfate and ammonia?
Original post by Cargos
Honestly not too bad? comparing it with the awful biology at least


what did u get for the last queation, why strontium is less soluble, shouldnt it be more cause lower bond enthalpy?

and for the 6m on crystals what were the inaccuracies
Reply 51
Avatar for hazpike
hazpike
2
Original post by Logic4Life
What last 6 marker the one about water of crystallisation?

Yeah I didn't get it at all
Reply 52
Avatar for hazpike
hazpike
2
Original post by Logic4Life
The one for barium wasnt that just NaOH, barium sulfate and ammonia?


I put NaOH but i don't get why it's the other two? I thought that the question said that there had to be a positive result for each ion in all three tests
Original post by Logic4Life
What did everyone get for the hess cycle one?


Calculations I remember:

0.15 Tonnes
Kc = 0.329
Ratio = 0.80
Hess Cycle = -61.8 (not sure)
MgSo4 LE = -2937
what did people get for the hess cycle calculation? I got -100kjmol-1
Original post by GenuineHpLaptop
what did u get for the last queation, why strontium is less soluble, shouldnt it be more cause lower bond enthalpy?

and for the 6m on crystals what were the inaccuracies


Weighing inaccuracies, reaction not gone to completion
has anyone started an unofficai mark scheme yet?
What did everyone put for the last 6 marker?I wrote about measuring mass of precipitate, the finding the moles of the precipitate and therefore the moles of MgSo4.xH2O. Then using the mass to find the molecular mass of it, minusing the molecular mass of MgSO4 and dividing by 18 to find the value of X.
Reply 58
Avatar for Rager6amer
Rager6amer
OP
4
Original post by Cargos
Honestly not too bad? comparing it with the awful biology at least


Agreed. I can't decide whether it was kind of decent or just better than the disaster that from the biology yesterday :P
Original post by bluntbluster
calculations i remember:

0.15 tonnes
kc = 0.329
ratio = 0.80
hess cycle = -61.8 (not sure)
mgso4 le = -2937


i got all the same

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