CHEMISTRY UNIT 3B MAY 2012...

[RedRose91]

so am wondering how did everyone do in this paper..
i guess i messed it up a little..
ESPECIALLY the last Q .. and the organic part... plus one or two on the first page ..
i think am losing like more than 20 marks >.< :'(

how did u solve the value of x in water of crystallization ? and the percentage error..
then the most important one is when they asked u wether error has any effect on :-
(a) carbon getting on the crucible..
(b) if NaBr splashes...

i messed that one up.. wt did u guys write????????????????

 

[Basherath]

so am wondering how did everyone do in this paper..
i guess i messed it up a little..
ESPECIALLY the last Q .. and the organic part... plus one or two on the first page ..
i think am losing like more than 20 marks >.< :'(

how did u solve the value of x in water of crystallization ? and the percentage error..
then the most important one is when they asked u wether error has any effect on :-
(a) carbon getting on the crucible..
(b) if NaBr splashes...

i messed that one up.. wt did u guys write????????????????

 

[Basherath]

yo.. i felt this paper was freaking messed... for x i got 2.2 and percentage error forgot what i wrote... for a) i wrote they decreased and b) they increased.
wat did u write??????

 

[RedRose91]

yo.. i felt this paper was freaking messed... for x i got 2.2 and percentage error forgot what i wrote... for a) i wrote they decreased and b) they increased.
wat did u write??????

umm for the value of x .. i got 2.7 !! from God know's where !!!

then for the error thing.. i wrote in both situations, the error wud INCREASE... cuuuz the value of x wud decrease... nd i have not the slightest idea if this sounds ever reasonable !!
oh damn...

am doing physics practical on fri.. r u ?

 

[Basherath]

haahahaa.... Well shit happens.... YEh am doing physics practicals on fri.. am screwed for this paper coz phy has always haunted me...lol

 

[xIshtar]

I wrote for the first part, the apparent mass of water released would be lower, and thus x would be lower. For the second one I wrote that the apparent mass of water released would be greater and x would be greater.
I got 2.2 for x and like 0.28 ish % for the percentage error.

 

[Basherath]

I wrote for the first part, the apparent mass of water released would be lower, and thus x would be lower. For the second one I wrote that the apparent mass of water released would be greater and x would be greater.
I got 2.2 for x and like 0.28 ish % for the percentage error.

i got the same answers just hope they are correct...

 

[xIshtar]

i got the same answers just hope they are correct...

Yeah I hope so too.

The only one I know for sure that I got wrong was the last part of the Hess Cycle.. I forgot to multiply by 2..

Oh well, good luck to everyone in their other papers

 

[z3r0thunder]

For that I wrote:
I) No change
II) Decreased

 

[simim]

hey whats the answer to the apparent mass of water removed when NaBr jumps nd the answer to the first and second improvemnt in Q5

 

[Basherath]

i wrote it increased........ and 1st improvement put a lid with holes and 2nd use an electric heater instead of burner

hey whats the answer to the apparent mass of water removed when NaBr jumps nd the answer to the first and second improvemnt in Q5