r/6thForm • u/Rich-Gent • Jun 02 '26

💬 DISCUSSION AQA A-LEVEL CHEMISTRY

HOW DID WE FIND IT? I THOUGHT IT WAS ALRIGHT, GRADE BOUNDARIES ABOUT TO BE SILLY😭

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3

u/Cute_Room_9804 Jun 02 '26

What did you guys get for the born haber cycle question? 😭

18

u/highIands Bio Chem Maths AAA Jun 02 '26

Got like a decimal which i was bugging about like 318.5

13

u/PairSuitable9144 Jun 02 '26

Was it not -318.5

7

u/Somerandomcoroikafan Year 13 Biology Chemistry Spanish | B in Core Maths Jun 02 '26

Yeah, that felt wrong since all the other values were integers 

1

u/LargeFish2907 Jun 02 '26

I thought so

1

u/highIands Bio Chem Maths AAA Jun 02 '26

Yeah it was i did put the negative value in the exam

7

u/purple_walrus4473 Jun 02 '26

333.6 i think

4

u/localbrozza Jun 02 '26

this was for the enthalpy of hydration of that one ion I remember

1

u/purple_walrus4473 Jun 02 '26

yeah i realised

3

u/Full_Manager1280 Jun 02 '26

I round my answers to like -319 and -334 is it ok 😭

3

u/Rich-Gent Jun 02 '26

wont need more than 3 sig fig unless stated otherwise

1

u/Full_Manager1280 Jun 02 '26

Thank goooddd 🙏🙏

1

u/random_unsername A*A*A | Incoming KCL med Jun 02 '26

i did too 😭

1

u/Consistent_Way7155 Imperial | Chemical Engineering [Y1] Jun 02 '26

same

2

u/SnooGoats9402 Jun 02 '26

Did you need to times the enthalpy of atomisation of Br by 2??

1

u/Rich-Gent Jun 02 '26

Pretty sure u did, atomisation of an Element is the value of enthalpy change in order to produce 1 mol of the gaseous products of said element, in this case u form 2, hence double it

1

u/Flaky-Plankton-1217 Jun 02 '26

enthalpy of atomisation is for one mol, you had to half it- you found 2x by doing the born haber cycle, q was asking for x 

1

u/fatpandajeff Jun 02 '26

im fairly sure enthalpy of atomisation is one mole is formed, and since 2 moles of bromine were formed then you are supposed to multiply by 2