[deej34]

(Original post by mathsguy)
Do you think 82 would be a high B or an A?

Should be an A.

[shuaib786]

(Original post by hus11128386)
wtf... i asked my teachers to predict my grades..

my chemistry teacher said B/C
and my biology teacher said E. wtf.. I HATE HER!!!!!!!!!!!!! grrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr rrrr

They cant give you the predicted grades until August results day. Btw what are you looking to apply for???

[merin]

does anyone know which section carries the most marks in this paper? section A or B? thanks

[shuaib786]

(Original post by merin)
does anyone know which section carries the most marks in this paper? section A or B? thanks

Section A

[craig12]

(Original post by hus11128386)
wtf... i asked my teachers to predict my grades..

my chemistry teacher said B/C
and my biology teacher said E. wtf.. I HATE HER!!!!!!!!!!!!! grrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr rrrr

I have felt your anger before. My predicted grades for A-level were DDDD my teachers said I was the laziest person they knew and that I would fail. Encouraging I know =/ First set of exams I got full marks in Chemistry and Biology

Just prove them wrong

[sophie15]

(Original post by Zytex)
Most people have only just finished the exam lol. Be a bit more patient.

The answer for working out the enthalpy change for the question involving standard enthalpies of formation was -49kJmol-1

Enthalpy change = (sum of the enthalpies of formation for products) - (sum of the enthalpies of formation for reactants) = -49kJmol-1



The answer for the q = mc(delta)T question was -399kJmol-1.

m = 140g, c = 4.18, (delta)T = 7.5

q = 140 * 4.18 * 7.5 = 4389J (for 0.011 moles of substance)

4389/0.011 = 399000J = -399kJmol-1

im sure this question asked for the enthalpy change for 1 mole at the very end?

[Tullia]

(Original post by sophie15)
im sure this question asked for the enthalpy change for 1 mole at the very end?

And?

[PowerPuff]

What do you think 74 will be?

Hoping a LOW A, since exam was pretty hard.

[sophie15]

(Original post by Tullia)
And?

and we worked out 0.011 or something so did you not have to convert it into one mole? im probrably totally wrong:')

[Tullia]

(Original post by sophie15)
and we worked out 0.011 or something so did you not have to convert it into one mole? im probrably totally wrong:')

Dividing by 0.011 does exactly this.

[sophie15]

(Original post by Tullia)
Dividing by 0.011 does exactly this.

oh of course!! i feel so stupid, sorry

[Tullia]

(Original post by sophie15)
oh of course!! i feel so stupid, sorry

No need to apologise.

If that mistake was made, then it's probably because you weren't thinking about Q/n. As that is what that is.

[PowerPuff]

What do we think grade boundaries will be?

[Lol_Fish]

(Original post by merin)
does anyone know which section carries the most marks in this paper? section A or B? thanks

Section A is mostly 70 marks Section B 30 marks

[PowerPuff]

Doing some calculations alongside Fusionary using the previous grade boundaries (considering the extreme papers) and the level of difficulty of this Exam

(Original post by Fusionary)
It has affected me because I desperately want 140 UMS and my raw mark is in the range of 87-91. So yeah.

So according to my judgements (which I have worked out before the test) and is in no way biased, an A would be worked out as follows:
(These are the A boundaries)
June 09 - 67
Jan 10 - 71
June 10 - 69
Jan 11 - 71
June 11- 79
Jan 12- 77
Using my logic of discounting the outlying data sets, we can conclude that the A will exactly:
(71+ 69 + 71 /3) leaving us with a prime total of *drum roll*........... 70.3

- 90/100 (140 UMS) Full UMS
- 71/100 (112 UMS) A
- 62/100 (98 UMS) B

[Mojojojo]

(Original post by PowerPuff)
Doing some calculations alongside Fusionary using the previous grade boundaries (considering the extreme papers) and the level of difficulty of this Exam



- 90/100 (140 UMS) Full UMS
- 71/100 (112 UMS) A
- 62/100 (98 UMS) B

Wait, so by those standards 53 is a C? Are you sure? I think i got 54, and below a C would kill me.
Is this 50%, Unit 1 30% and the ISA 20%?

Edit: I so hope you're right!

[stephie.u3]

(Original post by Scott.M)
Just read through the June 2011 paper and it seemed way harder than this and the grade boundaries for that were 79 for an A... I fear sky-high grade boundaries.

i did that exam last year and redid it before i did this exam and there is no way it was harder...it was really easy compared to this year so don't worry, grade boundaries should be average/low

howeverrr ...what i didn't realise until the beginning of this year and will probably put some of you at ease a bit more is don't forget that the individual grades for each unit really don't matter in the slightest. You are all aware that the grade boundaries change...75 ums might be an A one year but a B the next...all that matters is that you have 75 ums. get me?? make ums targets for yourselves not grades. I am so much happier knowing that i only have X amount of ums to get my overall grade, unit grades mean nothing so stop fretting over grade boundaries and more about how the raw marks will be scaled up

[Muppet Science]

(Original post by EllaBella<3)
Any grade boundary estimates??

It's horrible knowing that you crossed out a right answer and replaced it with utter rubbish :/

I know that feeling all too much, for some reason thought that tetra meant three, even with the four numbers in front on that questions - faceplam.

[brittanna]

(Original post by Muppet Science)
I know that feeling all too much, for some reason thought that tetra meant three, even with the four numbers in front on that questions - faceplam.

I did that with the question about which substance produces the brown colour. I crossed out iodine and wrote down KCl. I said to myself tha this would happen yet i still decide to do it .

[Millyshyn]

(Original post by Mojojojo)
Wait, so by those standards 53 is a C? Are you sure? I think i got 54, and below a C would kill me.
Is this 50%, Unit 1 30% and the ISA 20%?

Edit: I so hope you're right!

Look on here:
http://web.aqa.org.uk/UMS/index.php
54 is about a C most of the time, D when the grade boundaries have been high (last 3 papers).

It's 33.3% Unit 1, 46.6% Unit 2 and 20% ISA