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AQA Chemistry Unit 1 23rd May 2014 Unofficial Markscheme

Well T=293+273=566k, P=100Kpa=100,000Pa, and i believe (from what i remember) the Moles you had was of Fe(NO3)3 0.00893x3=0.02679mol of NO2.

So V= NRT/P = 0.02679x8.31x566/100000 = 1.26x10-3 give or take.

I think this exam was actually okay, i've lost a few stupid marks (the balanced equations weren't worth the time for 1 mark and i put HF for the ionic bond, completely forgot about Hydrogen being an exception) but there wasn't anything that massively threw me tbh.

Thank GOD someone got the same answer as me !!!! Yes i think 1.26 x 10-3 is correct, one of the markschemes on this thread says its v = (1.23 x10-3) m^3 , but that nots right.

Reply 261

Aidn

6

Original post by Xx1CALUM1xX

Thank GOD someone got the same answer as me !!!! Yes i think 1.26 x 10-3 is correct, one of the markschemes on this thread says its v = (1.23 x10-3) m^3 , but that nots right.

The 1.23x10-3 answer was for the 5 mark concentration question. 6(a)(i) to be precise. 1.26x10-3 is definitely the answer to the pV=nRT question :smile:

Reply 262

em123xxx

Was the final question one on bonding between thallium and boron? Was it the same page that had the shapes of molecules ? I'm panicking in case I missed it now but that was the last page I answered.

Reply 263

Gordontang8

For the pV=nRT

Does the pressure need to be like 100*1000*0.8 (The 0.8 is according to mole ratios)

(edited 9 years ago)

Reply 264

person287

For the catalyst for thermal cracking question I put Aluminium Oxide because I thought it said name the catalyst and I thought Zeolite Catalysts were a sort of group/type - would that still be right?

Reply 265

em123xxx

Original post by Myosin

The format of the question paper was absolutely RETARDED this year. I would have missed it too if I hadn't bothered to turn the whatpage over!
I'm presuming about 25% people will have missed it!

What was on the last page?

Reply 266

WishIHadRevised

13

For the last page at the top we had to draw 2 of the molecular ions didn't we? But we only had to name and predict the angle for one of them??

Reply 267

Tryingtosucceed

I've worked out the lowest I could have is 54/70 and the highest is 57/70. With either of these grades, am I able to get an A overall if I do well in chem2? My coursework was 39/50.
Finally, do they really bring grade boundaries down? What is the A grade boundary most likely to be in this test?

Reply 268

Myosin

Original post by Tryingtosucceed

I've worked out the lowest I could have is 54/70 and the highest is 57/70. With either of these grades, am I able to get an A overall if I do well in chem2? My coursework was 39/50.
Finally, do they really bring grade boundaries down? What is the A grade boundary most likely to be in this test?

Anywhere from 49-54

Reply 269

Tryingtosucceed

Are you serious? That would be a very low grade boundary though, are they likely to bring it so far down?

Original post by Myosin

Anywhere from 49-54

Reply 270

Myosin

Original post by Tryingtosucceed

Are you serious? That would be a very low grade boundary though, are they likely to bring it so far down?

Not that far down at all though, considering the fact that it has been 54 for an A for the last two CHEM1 examinations and the fact that this year there was only one sitting allowed the grade boundaries are likely to drop by 2-3 marks each

Reply 271

ghost_rebel

10

For the question about the electronegativity and ionic compound thing, did u have to write an equation down or just write LiF?

I wrote down an incorrect equation but got LiF as the product!Do I get the mark??

Reply 272

Tryingtosucceed

This definitely isn't bad news!!

Original post by Myosin

Not that far down at all though, considering the fact that it has been 54 for an A for the last two CHEM1 examinations and the fact that this year there was only one sitting allowed the grade boundaries are likely to drop by 2-3 marks each

Reply 273

randlemcmurphy

11

Do you think it is alright that I drew the molecular shapes in pencil, just in case I got it wrong so I could erase and start again. Will this be a problem?

Reply 274

ps1265A

14

Original post by Myosin

Anywhere from 49-54

When was it 49?

Reply 275

randlemcmurphy

11

Original post by ps1265A

When was it 49?

Do you think it was alright drawing the molecular shapes in pencil?

Reply 276

qvoRlx

4

Original post by Dirac321

I didn't realise there was a question on the back of the paper so I missed the whole of the last question. Any thoughts on whether they might disregard the last question? Ridiculous paper formatting, I'm stupidly angry. I think I got about 58/70, had I seen the last question I could have gotten 66/70. Anyone have an idea for the A and B grade boundaries?

same here, I wonder whether there are more candidates with the same problem so that maybe we could appeal?

Really went mad when I realised there's a #7 after the exam.

Ridiculous paper formatting+1 :mad:

(edited 9 years ago)

Reply 277

ghost_rebel

10

Original post by qvoRlx

same here, I wonder whether there are more candidates with the same problem so that maybe we could appeal?

Really went mad when I realised there's a #7 after the exam.

Ridiculous paper formatting+1 :mad: