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# AQA GCSE CHEMISTRY UNIT 2 HIGHER CHY2H January 2012 unofficial mark scheme

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1. (Original post by metaltron)
i) I don't think so
ii) You might get away with it, not sure though
do you think id get a mark for aluminium is very reactive
2. (Original post by UFO)
Fe, O
percentage = 70, 30
divided by relative atomic mass = /56, /16
= 1.25, 1.875
(I think people rounded their answers here or on the step below)
divided by the smallest = 1,1.5
times by 2 to get a whole number = 2,3 (Fe2O3)

Does that make sense?
yess thanks
3. Any idea on the 100 UMS / A* boundaries?
4. (Original post by aimes12)
for question 5bii i put they have a larger surface area would i get the mark??
A larger surface area is definitely the correct answer.
5. (Original post by g.k.galloway)
is it march 8th the results come out??

and is it by post or at school??
yes around march & during school (:
6. On the empirical formula I did 56/70 and 16/30 instead of 70/56 and 30/16 so got fe3o2 by accident but will I get any method marks??????
7. Also, for how to separate Mg(Oh)2 could evaporation get the mark?
8. I've got 33/34, what grade am I looking at?
9. (Original post by Imanerd)
Also, for how to separate Mg(Oh)2 could evaporation get the mark?
No as the Mg(Oh)2 was in a solution of a different chemical.
10. (Original post by Imanerd)
I've got 33/34, what grade am I looking at?
Well as grade boundaries vary considerably it's hard to tell.

Although considering that the exam wasn't too bad maybe a high B/A.
11. (Original post by Imanerd)
On the empirical formula I did 56/70 and 16/30 instead of 70/56 and 30/16 so got fe3o2 by accident but will I get any method marks??????
nope completely wrong method
12. Yeah, 1 product was solid one was AQ, so they might allow it, could u pls address my empiracl formula query, thanks
13. (Original post by USB)
Well as grade boundaries vary considerably it's hard to tell.

Although considering that the exam wasn't too bad maybe a high B/A.
****ttttt, basically I missed out a double page = 8 marks gone otherwise I wid have done well ;(
14. (Original post by Imanerd)
On the empirical formula I did 56/70 and 16/30 instead of 70/56 and 30/16 so got fe3o2 by accident but will I get any method marks??????
You might get 1 method mark but I am not sure.
15. For the last question....could you have said: The screen would be slippery?

and for the first question....could you have said....Electrolysis wasn't yet discovered (as electrolysis is used to seperate alminium from its ore
16. (Original post by Basit2010)
nope completely wrong method
actually, if you do the ratio upside down, but all the rest of your working is correct, you will only lose one mark.
17. what was the answer to the half equation one !?
18. (Original post by purplereem)
yes around march & during school (:
thanks
19. (Original post by outsider95)
actually, if you do the ratio upside down, but all the rest of your working is correct, you will only lose one mark.
If you do the working out upside down then the rest of your working will be incorrect as it relies on how you set it out. marks are only awarded if you do not simplify or get the right awnser so you will get the mark for Mass/MR. Mr/Mass is not awarded marks as it is the incorrect way to work it out.
20. (Original post by Basit2010)
If you do the working out upside down then the rest of your working will be incorrect as it relies on how you set it out. marks are only awarded if you do not simplify or get the right awnser so you will get the mark for Mass/MR. Mr/Mass is not awarded marks as it is the incorrect way to work it out.
error not carried forward.

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