Official AQA AS Chemistry Unit 1 - 23Rd May 2013

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Reply 380

jodie.irwin27

Original post by The Lawful T.J

I put BCl4+ whatever it was xD

- Tom

i thought it was B but then i realised that the elctrons didn't add up, so i chose SiCl4 in which the elctrons added up

Reply 381

Tom_hess

Original post by The Lawful T.J

I put BCl4+ whatever it was xD

- Tom

Seems plausible, I put some random BK4-, which I know is wrong! But I couldn't leave it blank haha!

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Reply 382

jodie.irwin27

how the hell did people work out the percentage purity for Zn though?! the word purity just put me completely off!

Reply 383

The Lawful T.J

Original post by Tom_hess

Seems plausible, I put some random BK4-, which I know is wrong! But I couldn't leave it blank haha!

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Hmm! It was terrible. My friend got 90% for that purity question too... /: how? I was so confused! And why did you put for the aluminium compound? 1st, 2nd, 3rd ionisation etc? :smile:

- Tom

Reply 384

hieuluu

Purity question was just like percentage yield. HOW DID I NOT KNOW THAT :frown:

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Reply 385

Herucles

Good news is that this was harder than Jan 2012 (imo) - and on the ums converter below:

http://www.aqa.org.uk/exams-administration/about-results/uniform-mark-scale/convert-marks-to-ums

We find that 59/70 converts to 90% UMS lol (62/70 converts to 95%, 65 converts to 100%) - so expecting boundaries somewhere near this I think we all did fine (relatively speaking).

Reply 386

jodie.irwin27

Original post by hieuluu

Purity question was just like percentage yield. HOW DID I NOT KNOW THAT :frown:

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omg GUTTED! :'(

Reply 387

hieuluu

Original post by jodie.irwin27

omg GUTTED! :'(

I'm so pissed off! I was confident to get like at least 85 ums, now 70. Surely that's not an A overall

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Reply 388

Tom_hess

Original post by The Lawful T.J

Hmm! It was terrible. My friend got 90% for that purity question too... /: how? I was so confused! And why did you put for the aluminium compound? 1st, 2nd, 3rd ionisation etc? :smile:

- Tom

I put 2 as to get it to the 6s1 orbital? But the Xe confused me:s

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Reply 389

smileitsfree

i got 2nd IE for the multiple choice qs ?

Reply 390

blueboa

I put BF4- for the similar one... Is that right?

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Reply 391

jodie.irwin27

Original post by hieuluu

I'm so pissed off! I was confident to get like at least 85 ums, now 70. Surely that's not an A overall

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DAMN. 4 marks gone already.. i really hope i get an A Though..ah well can only hope now!

Reply 392

The Lawful T.J

Original post by smileitsfree

i got 2nd IE for the multiple choice qs ?

Same. I put 3rd first then was like NO.

- Tom

Reply 393

amar96

WTH was the moles about... for the first one did you have to minus the mass of water as it asked for ANHYDROUS and the 2nd one can suck my balls

Reply 394

hieuluu

Original post by smileitsfree

i got 2nd IE for the multiple choice qs ?

Yeah I got that too since TL outer electron is in p1 orbital. Minus 2 electrons so it would be s1. 2nd inonisation energy

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Reply 395

smileitsfree

Did y'all get x=7 for the anhydrous question

Reply 396

Tom_hess

Original post by The Lawful T.J

Same. I put 3rd first then was like NO.

- Tom

Haha same!!! XD

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Reply 397

jodie.irwin27

Original post by amar96

WTH was the moles about... for the first one did you have to minus the mass of water as it asked for ANHYDROUS and the 2nd one can suck my balls

basically work out the empirical formula, so mass of ZnSO4 and mass of H20 - to work out the mass of ZnSO4 then you had to take away the anhydrous mass from the hydrous one?? something like that