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

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Reply 40
Avatar for purplereem
purplereem
why are some people saying that for the emperical formula it was FeO2???
and that the electrolysis question was 2Mg+ +2e- -> 2Mg????
im confused lol
Original post by Basit2010
Going to guess around 37-39 for The a* on this paper, been 38 for an a* two years running now.


I'm going for 34 because last time empirical formula came up the boundaries were low and loads of people missed two marks out. Also, there were some tricky questions. The paper was nice but I did ****.
Reply 42
Avatar for nikil15
nikil15
Original post by purplereem
why are some people saying that for the emperical formula it was FeO2???
and that the electrolysis question was 2Mg+ +2e- -> 2Mg????
im confused lol


na mate fe2o3
Original post by purplereem
why are some people saying that for the emperical formula it was FeO2???
and that the electrolysis question was 2Mg+ +2e- -> 2Mg????
im confused lol

It was Mg2+ not 2Mg
And the empirical formula was Fe2O3
Reply 44
Avatar for metaltron
metaltron
OP
11
Original post by momo26396
For the ion question (in electrolysis) - Didnt it ask why a molten ionic compund could conduct electricity, not why a solid ionic compound could not conduct electricity?????????


Yeah that was a different question, the one that says the ions are mobile!
Reply 45
Avatar for UFO
UFO
1
Original post by purplereem
why are some people saying that for the emperical formula it was FeO2???
and that the electrolysis question was 2Mg+ +2e- -> 2Mg????
im confused lol


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?
Reply 46
Avatar for momo26396
momo26396
for the electrolysis ion question, did it ask why they could conduct electricity when molten or that they couldn't when solid??????????????????????????
Reply 47
Avatar for Welbeck
Welbeck
3
Original post by momo26396
For the ion question (in electrolysis) - Didnt it ask why a molten ionic compund could conduct electricity, not why a solid ionic compound could not conduct electricity?????????


Yes, your right, just remembered about that. I put because electrons are free to move when molten so can carry current or something like that
Reply 48
Avatar for metaltron
metaltron
OP
11
Original post by momo26396
for the electrolysis ion question, did it ask why they could conduct electricity when molten or that they couldn't when solid??????????????????????????


q3c
Reply 49
Avatar for momo26396
momo26396
For 1a- could you write, they couldn't provide enough heat energy (since it said it was very endothermic)
For 1aii- could you write that they had to provide enough energy for the particles to collide
?????
Thankyou in advance :smile: :smile:
Reply 50
Avatar for Basit2010
Basit2010
9
Did anyone sit the C3 paper aswell? what were your thoughts? http://www.thestudentroom.co.uk/showthread.php?p=36076209#post36076209
Reply 51
Avatar for metaltron
metaltron
OP
11
Original post by momo26396
For 1a- could you write, they couldn't provide enough heat energy (since it said it was very endothermic)
For 1aii- could you write that they had to provide enough energy for the particles to collide
?????
Thankyou in advance :smile: :smile:


i) I don't think so
ii) You might get away with it, not sure though:s-smilie:
Original post by momo26396
For 1a- could you write, they couldn't provide enough heat energy (since it said it was very endothermic)
For 1aii- could you write that they had to provide enough energy for the particles to collide
?????
Thankyou in advance :smile: :smile:


exactly what i put for 1a and alot of my friends.
Reply 53
Avatar for momo26396
momo26396
Was the electrolysis answer:

Mg(2+) + 2e- -> Mg????
Reply 54
Avatar for metaltron
metaltron
OP
11
Original post by momo26396
Was the electrolysis answer:

Mg(2+) + 2e- -> Mg????


Yes have you looked at the mark scheme!!!!:smile:
Original post by momo26396
Was the electrolysis answer:

Mg(2+) + 2e- -> Mg????


100% yes
Reply 56
Avatar for momo26396
momo26396
for last question could you write that impulses would not be detected if it was thicker??
Original post by momo26396
for last question could you write that impulses would not be detected if it was thicker??


and what about itwould be weaker as the atoms slide over each other? (layers)

i dont think i'll get it but
Reply 58
Avatar for Blashnet
Blashnet
8
does anyone have an unofficial mark scheme for the aqa unit one chemistry exam that was today aswell? :smile:
Reply 59
Avatar for TheSnail
TheSnail
17
is it march 8th the results come out??

and is it by post or at school??

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