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Chemistry: Post your doubts here!

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Camille96

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Hi everyone. Does chemistry paper 3 has a huge effect on the overall grade? For example, if a student did not do well AT ALL in P3, can he/she catch up on the rest of the chemistry papers to get at least a B or A? I know A* is out of question in this case.
 
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bludlynsolja

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Hi! to be honest, all the papers have a significant effect on the overall result.
but obviously the other 2 papers are more weighty. paper one comprises of 31% of tbe total and paper 2 46% of the total, the remaining 23% is what the p3 or practical paper consists of.
from my past experience and my very limited knowledge, i would advise people to work hard for the practicals coz you know it is the only paper where you are sure of scoring marks. see, i agree that it is not completely a stroll in the park with the structured paper, but its mostly, following instructions given in the practical and most of all: TRUSTING YOUR WORK MORE THAN EVEN YOUR NEAREST NEIGHBOUR!!
But, since u feel that u got no hope with it, and this could be due to various factors like thinking your working was wrong while discussing after the exam with your friend, i think you should still have hope if thats the reason for despair coz in practicals, no bodies answer is certainly correct, so u may be right while they are wrong BUT in any case, if you do feel certain that u have no hope, then working hard for the other 2 papers is going to be a massive boost and u can still get an A no doubt at all.
for instance if u struggle real hard and are able to get 40 out of 46 in practicals and then maybe 20 out of 31 in the mulitple choice( u can infact even get 25 and above provided u utilize ur time well since i believe u will have around a fortnight to study for the multiple paper so u can do as many papers as is there. then i think u can score a 25) , zo u will have a 65 out of 100 un ur belt already from these two papers, and i am sure in practical u wont get lower than a 10 out of 23, so all those added up gives 75 percent.
then the thresholds come into play, if the thresholds are low, then the 75 percent might even be equivalent of an A so u are sorted.
this is from the very little knowledge and experience i have like i said earlier.
P.S for the multiple choice questions i would recomend that u see the topical questions, they really helped me as they are mulitple questions based on each topic, i am sure u must have seen em! :)
 
Metanoia

Metanoia

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RoOkaYya G said:
mark scheme is more likely to hve errors than data booklet :)
Click to expand...
:) I kind of agree. So long as you see that the application of concepts is correct, then theres no need to worry.

This was a question I was looking for, from W12_qp12
Screen Shot 2014-10-21 at 8.12.49 PM.png

I think using bond energy of N2 as 994kJ/mol will give us the answer A, while using 944kJ/mol will not give us any of the above answer.
So students practicing past year papers might be a bit confused for this question.
 
RoOkaYya G

RoOkaYya G

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MYLORD said:
soooo... how was ur practical !!
i got some type of paralysis attack in the 1st 15 minutes.
it was like my mind has gone blank because i did the practical after about 2-3 months gaps !! Imagine.
i hope the threshold is low this time.
Click to expand...
lol :p u shldve practiced!
i was shocked too coz there was no titrations :(
well it was ok i guess. wbu?
 
Metanoia

Metanoia

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33 The conversion of graphite into diamond is an endothermic reaction (∆H = +3 kJ mol–1).
C(graphite) → C(diamond)
Which statements are correct?
1 The enthalpy change of atomisation of diamond is smaller than that of graphite.
2 The bond energy of the C–C bonds in graphite is greater than that in diamond.
3 The enthalpy change of combustion of diamond is greater than that of graphite.

Ans : 1,2,3
Click to expand...

Easiest to visualise statements 1 and 3 using the energy diagrams.
Screen Shot 2014-10-25 at 9.56.59 AM.png

Statement 2 can be known to be true from background knowledge, or we can use the energy diagram on the left. Since it takes more energy to break the C(solid) of graphite into C(gas), we can infer that the C-C bonds of graphite is stronger.
 
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