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Chemistry Unit 5 IAL (WCH05)

How was it??

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Average. I am guessing ~75 mark for an A*.
Reply 2
Avatar for Basmaa
Basmaa
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Original post by airheadbuster
Average. I am guessing ~75 mark for an A*.


Seriously? I though section B was harder than usual. Same with some MCQ. :s
Original post by Basmaa
Seriously? I though section B was harder than usual. Same with some MCQ. :s


Ya but section C was easier. 20 easy marks.
okay lets discuss the paper please?

what was the ans for the 1st mcq about the oxidation numbers?
the paper was a bit hard ...
Reply 5
Avatar for Basmaa
Basmaa
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Original post by airheadbuster
Ya but section C was easier. 20 easy marks.


Oh, yeah, good point.

How did you do with the molecular formula question? I've never seen a question like it before.
stereospecific drug :redface:
Original post by deathbychem
okay lets discuss the paper please?

what was the ans for the 1st mcq about the oxidation numbers?
the paper was a bit hard ...


Mn?
Original post by deathbychem
stereospecific drug :redface:


I wrote, "receptor in the body sensitive to only one type of optical/geometric isomer."
the electronic configuration of V was?
Original post by deathbychem
the electronic configuration of V was?


3d^3 4s^2.
Original post by Basmaa
Oh, yeah, good point.

How did you do with the molecular formula question? I've never seen a question like it before.


Jan 14 IAL paper. There is a similar MCQ question. :wink:

(I wrote C11H11 though. I think it matched the molecular question. Not sure. I was rushing the last 2 questions as I had like 30 minutes left. :angry:)
what did you guys get for mcq no. 7..the one about the color intensity graph?
Original post by deathbychem
what did you guys get for mcq no. 7..the one about the color intensity graph?


When I saw this question, for a moment I thought I was done! Blind picked C. :s
Reply 14
Avatar for Basmaa
Basmaa
OP
Original post by airheadbuster
Jan 14 IAL paper. There is a similar MCQ question. :wink:

(I wrote C11H11 though. I think it matched the molecular question. Not sure. I was rushing the last 2 questions as I had like 30 minutes left. :angry:)


I actually completely forgot about the Jan 14 paper... did literally every paper but that one. :\

I wrote something insane like C38H40. I think the time constraint made me mess up a lot 'cause I was panicking.
Anyone found the percentage of CaCO3 in limestone? Mine was 71.sth.
Reply 16
Avatar for biochris
biochris
Original post by airheadbuster
Anyone found the percentage of CaCO3 in limestone? Mine was 71.sth.


Mine was 71.1 I think.. and for the %error due to the solubility of CaC2O4 i got something like 1.7...
Reply 17
Avatar for biochris
biochris
Original post by deathbychem
what did you guys get for mcq no. 7..the one about the color intensity graph?


it was the first one (the symmetrical one)..
Original post by biochris
Mine was 71.1 I think.. and for the %error due to the solubility of CaC2O4 i got something like 1.7...


I skipped that.

Another question, do we have to double the lowest count to find % uncertainty when using pipette and volumetric flask?
we need an unofficial mark scheme seriously
And yes, this was the toughest paper

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