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OCR B Salter's Chemistry by Design F335 - 15th June 2015

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When you boil the concentration of water in liquid state decreases. Equilibrium position shifts to left. Yh I got that for hydration. Kw I had no idea just plugged some numbers and hoped for the best. I think I got only 1 as initiation.

i did the same

Reply 241

Beasttty

Kw pH was 11.3 pH. 100% sure

Reply 242

BrokenS0ulz

Think I've probably lost about 20 marks hope that's enough for an A*

Reply 243

The fish inspect

For the ph question did anyone get 7.48 as the overall ph??

Reply 244

JakeDaw

Original post by LordGaben

When you boil the concentration of water in liquid state decreases. Equilibrium position shifts to left. Yh I got that for hydration..

Ah yeah that makes sense now actually, I talked about the forward reaction being exothermic whoops

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Reply 245

LordGaben

Was the % by mass of nitrogen supposed to be to 2sf or 3. I did it to 3

Reply 246

BrokenS0ulz

Original post by JakeDaw

Ah yeah that makes sense now actually, I talked about the forward reaction being exothermic whoops

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I did the exact same I think we should manage 2/3 for that thiugh?

Original post by LordGaben

Was the % by mass of nitrogen supposed to be to 2sf or 3. I did it to 3

I did it to 2

Reply 247

JakeDaw

Original post by LordGaben

Was the % by mass of nitrogen supposed to be to 2sf or 3. I did it to 3

I put 3 as well because the Ar values are 3 s.f. I think I got 35.0%?

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Reply 248

BrokenS0ulz

holy poo didn't realise all the Ar values were to 3 s.f, I used them as 2 s.f :frown:

bye another mark

Reply 249

Charletitia

Original post by JakeDaw

I put 3 as well because the Ar values are 3 s.f. I think I got 35.0%?

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I got 35.0 too.

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Reply 250

sweettooth123

Original post by Charletitia

I got 35.0 too.

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I got that as well!

Reply 251

BrokenS0ulz

Was the temperature 1118K for entropy change?

Reply 252

Charletitia

I may and am expecting I got this completely wrong but for the substrate I didn't say serotonin I said (O) - don't ask me why ahha! I thought since it said reversible that the only way it could be was if it was O because it could be reduced then oxidised back?

Also I got 8% for the amount of ammonia converted- total guess!

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Reply 253

lucy1996

how many marks was the question about ammonia converted (3/4?)- left it out and was going to go back to it but forgot! ah well probably wouldn't have got it anyway!

Reply 254

The fish inspect

Original post by BrokenS0ulz

Was the temperature 1118K for entropy change?

Yep that's what I got

Reply 255

Anon12345678

What did you put for the benzene long answer question?

Reply 256

Lissy14

oh my god oh my god oh my god!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! :bawling:

that entire section on chlorophenol?
(the number of isomers, NMR etc.)

I just completely miss read the question!!!!

I THOUGHT IT SAID CHLOROBENZENE!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
:bawling:

How many marks was that section worth?