Chemistry Unit 3 exam discussion here >>>>

[U stalking ME]

it was
+94Kj/mol coz the =30 was supposed to be multiplied by 2.

o.o wat the.. oh well wats done is done....will lose one mark

what did u guys get 4 the % uncertainty? was it 0.29%?

yea

 

[shoaeb]

wat abt the improvement question??? wat did anyone write for that??

haha for the improvement i wrote that you should cover the top so that they dont bounce..then i realised that water evaporates..but i still wrote it
and the other one..all the substance should be transfered to the crucible

 

[Stoner]

yah wt did u guys write 4 the improvemnts thing? n the effects of the errors

 

[Zifa]

haha for the improvement i wrote that you should cover the top so that they dont bounce..then i realised that water evaporates..but i still wrote it
and the other one..all the substance should be transfered to the crucible

lol i wrote use an electric heater instead of bunsen flame, it made sense then i like a stupid person cancelled it! i also wrote to use a waterbath for some reason unknown to me! :/

 

[Zifa]

yah wt did u guys write 4 the improvemnts thing? n the effects of the errors

my first effect n error were both increase n increase then the other were both decrease decrease

 

[yousef0074]

Unfortunately I also worked out delta H as +64 kj/mol, but I got the percentage error as + or- 0.29%

 

[Stoner]

oh well

my first effect n error were both increase n increase then the other were both decrease decrease

well i wrote it the other way round..

 

[shoaeb]

when the crystals would bounce away the mass of water removed would increase..thats what i wrote...cuz i tried decreasing the value for "mass after heating" and subtracted it with the other value...and the mass of water removed was more..

 

[shoaeb]

such an annoying paper

 

[Zifa]

oh well
well i wrote it the other way round..

oh well! i would relly want to get my hands on this papers mark scheme!

 

[shoaeb]

oh well! i would relly want to get my hands on this papers mark scheme!

Tell Me About It,Im Looking forward to re-sitting this paper in may 013

 

[yousef0074]

For the improvements I wrote : weigh the crucible immediately after heating and second one was to remove the crucible, then add the hydrated solid and place it back on the balance incase of spillage won't fall on balance. So this is a more accurate way of fInding the mass. I got x to be 2.3. Are these answers reasonable?

 

[Stoner]

yah i

For the improvements I wrote : weigh the crucible immediately after heating and second one was to remove the crucible, then add the hydrated solid and place it back on the balance incase of spillage won't fall on balance. So this is a more accurate way of fInding the mass. I got x to be 2.3. Are these answers reasonable?

yah thts wt i got.. i got 2.2

 

[Zifa]

For the improvements I wrote : weigh the crucible immediately after heating and second one was to remove the crucible, then add the hydrated solid and place it back on the balance incase of spillage won't fall on balance. So this is a more accurate way of fInding the mass. I got x to be 2.3. Are these answers reasonable?

yeah my x was 2.3 too

 

[yousef0074]

Hope the curve would be very low for this paper

 

[U stalking ME]

yah i
yah thts wt i got.. i got 2.2

yea same here got 2.2

 

[Zifa]

Tell Me About It,Im Looking forward to re-sitting this paper in may 013

no way this shit is oveerrr! im concentrating on A*ing unit 1 n 2

 

[shoaeb]

no way this shit is oveerrr! im concentrating on A*ing unit 1 n 2

you giving physics u3?

 

[Stoner]

you giving physics u3?

yah i m

 

[Zifa]

you giving physics u3?

no physics is the only science im not sitting for! more time for me to study! but gd luck if u take it