Paper 53 Nov2011 chemistry answer discussion!!!!

[ItwasAandBC]

Guys, was it easy?? Yes! Discuss here

 

[WhiteAngel]

my paper was 52 is it the same ????

 

[byhn222]

I did 52 not 53 but i wanted to ask something, if i drew a table in pencil and filled in the headings in pencil would i still loose the marks? I wrote it in pencil first in case i changed anything but i didn't have time to write it in pen uuurgggh

 

[WhiteAngel]

i have the same question ::: i did the same thing but the headings were in Pen !

 

[byhn222]

i have the same question ::: i did the same thing but the headings were in Pen !

I think if the table is in pencil it's okay, what worries me is that i actually wrote the headings in pencil too :S

 

[WhiteAngel]

ohhkay i hope they accept both in pencil !!

 

[ching293]

i did paper53,most of them said it was easy, how was your question one, i am not sure about my answer :S

 

[sankyung56]

yep2, i thought it was going to be hard since our centre wasn't really focused on practicals, but it turned out to be.. errmmm.. i don't really sure whether whatever i wrote in it is correct or not :S

 

[Paradise]

Opps! The second question, I divide the number of moles of oxygen atoms by (2X16) instead of just 16. I plotted the graph and I got the answer correct. But the comment on the graph is wrong since my table is wrong, which mean my y-axis also wrong. So my question 2 gone :'(

 

[ching293]

Opps! The second question, I divide the number of moles of oxygen atoms by (2X16) instead of just 16. I plotted the graph and I got the answer correct. But the comment on the graph is wrong since my table is wrong, which mean my y-axis also wrong. So my question 2 gone :'(

how was your question one, i dont think i got it right :S

do you remember?

 

[Paradise]

Question one was still okay but average only..I hope there is ecf for my question 2 by using the wrong table..:S

 

[offerong]

Opps! The second question, I divide the number of moles of oxygen atoms by (2X16) instead of just 16. I plotted the graph and I got the answer correct. But the comment on the graph is wrong since my table is wrong, which mean my y-axis also wrong. So my question 2 gone :'(

so what is ur answer ? Pb3O4 also ?

 

[Paradise]

Yupe I got Pb3O4..I'm able to get the answer all from my graph..but it is actually wrong..coz my number of moles of oxygen is wrong..:S

 

[offerong]

Yupe I got Pb3O4..I'm able to get the answer all from my graph..but it is actually wrong..coz my number of moles of oxygen is wrong..:S

then how bout ur anomalous point...i gt the point 4 and point 8 i think...coz i also forgot wat i divided...but dun worry lah...it's ok...sure gt ECF one...then maybe just lose one mark for that...cheer up !

 

[AAestar]

Opps! The second question, I divide the number of moles of oxygen atoms by (2X16) instead of just 16. I plotted the graph and I got the answer correct. But the comment on the graph is wrong since my table is wrong, which mean my y-axis also wrong. So my question 2 gone :'(

At first I plotted that...but then I sensed something fishy and changed it back to divide the mass over 16. ..And table with pencil is fine!

 

[AAestar]

then how bout ur anomalous point...i gt the point 4 and point 8 i think...coz i also forgot wat i divided...but dun worry lah...it's ok...sure gt ECF one...then maybe just lose one mark for that...cheer up !

The funny thing is the anomalous point for divided by 16 and divided by 32 are the same. O_O

 

[offerong]

then how bout ur anomalous point...i gt the point 4 and point 8 i think...coz i also forgot wat i divided...but dun worry lah...it's ok...sure gt ECF one...then maybe just lose one mark for that...cheer up !

The funny thing is the anomalous point for divided by 16 and divided by 32 are the same. O_O

then based on ur experience..ll we get the ecf mark for that ? for the error that we had made..just deduct 1 mark for wrong calculated mole of oxygen...coz the answer no matter wat we divided..either 16 or 32 are the same...so i think they ll just deduct 1 mark for the mistake and other parts may based on our wrong ans ?

 

[offerong]

then how bout ur anomalous point...i gt the point 4 and point 8 i think...coz i also forgot wat i divided...but dun worry lah...it's ok...sure gt ECF one...then maybe just lose one mark for that...cheer up !

The funny thing is the anomalous point for divided by 16 and divided by 32 are the same. O_O

but i think i still remember my first point for mole of oxygen is 0.029 ...if not mistaken...

 

[Paradise]

Yupe I got Pb3O4..I'm able to get the answer all from my graph..but it is actually wrong..coz my number of moles of oxygen is wrong..:S

then how bout ur anomalous point...i gt the point 4 and point 8 i think...coz i also forgot wat i divided...but dun worry lah...it's ok...sure gt ECF one...then maybe just lose one mark for that...cheer up !

I hope there is just one mark was deducted :S hmm I actually have three anamolous point. Point 3,4 and 8..3 and 4 is actually quite near so I put them together with one explanation for them..>.< and my explanation was err...decomposition is not completed..and for point 8 is like..Erm....so solid is lost when heating..

 

[ching293]

Yupe I got Pb3O4..I'm able to get the answer all from my graph..but it is actually wrong..coz my number of moles of oxygen is wrong..:S

then how bout ur anomalous point...i gt the point 4 and point 8 i think...coz i also forgot wat i divided...but dun worry lah...it's ok...sure gt ECF one...then maybe just lose one mark for that...cheer up !

I hope there is just one mark was deducted :S hmm I actually have three anamolous point. Point 3,4 and 8..3 and 4 is actually quite near so I put them together with one explanation for them..>.< and my explanation was err...decomposition is not completed..and for point 8 is like..Erm....so solid is lost when heating..

my explanation for both points are the same as yours