AQA Chemistry C3 - Unofficial Mark Scheme

Scroll to see replies

Reply 320

srmed

Original post by nisha.sri

Yeh it is that's what it said in my text book :smile:

Although it said 'an....' so i think it's acid but i'm sure that's right :smile:

Yeah strange, I think they will accept either acid or sulphuric acid

Posted from TSR Mobile

Reply 321

Fractite

Original post by srmed

Yeah strange, I think they will accept either acid or sulphuric acid

Posted from TSR Mobile

I just write 'acid' since writing 'sulphuric acid' wouldn't have made gramatical sense.

Reply 322

username2312801

Original post by surina16

Yeah, I regret changing so many answers ffs! :frown:

Like I changed fluorine to iodine, and in the titration I changed my answer so I said the acid was in the pipette :redface:

I think I got -1276 for that, and for the catalyst I put acidic :lol:

What did you put? :smile:

Meh, thank you - I really hope so tbh :/ I'm sure you did great because of how hard you have worked :biggrin:

Yeh oh no !! I'm sure it won't mind :wink:

I got 2 thousand something :s-smilie:

Lol yeh that's right i put something very stupid :redface:

Those were the two annoying questions including the energy change one what did you do for that one ?

Reply 323

srmed

Original post by Fractite

I just write 'acid' since writing 'sulphuric acid' wouldn't have made gramatical sense.

Lol yeah I didn't really notice or pay attention to that haha

Posted from TSR Mobile

Reply 324

pixiefuller

What did everyone put for the Haber process question where you had to say why air shouldn't be allowed into the reactor?

Reply 325

Onisparks

Original post by nisha.sri

What did you get ?

I really don't remember, I think it was -1200 (the zeros are the numbers I don't remember)

Reply 326

Fractite

Original post by pixiefuller

What did everyone put for the Haber process question where you had to say why air shouldn't be allowed into the reactor?

I write about impurities messing up the reaction. Not sure if that's right though..

Reply 327

FAO_26

Original post by JDoza

I'm so confused.. Our paper didn't have a specific heat capacity question but we had most of the questions mentioned in this thread. 🤔

You probablyprobably did the further additional C3 paper . That's the one I did as well and I don't remember a specific heat capacity question. The papers are usually very similar but some questions are a bit different.

Reply 328

srmed

Original post by pixiefuller

What did everyone put for the Haber process question where you had to say why air shouldn't be allowed into the reactor?

Idk I said that air contains oxygen which is reactive and so it will affect the reaction and ammonia will not be made?

Posted from TSR Mobile

Reply 329

pixiefuller

Original post by srmed

Idk I said that air contains oxygen which is reactive and so it will affect the reaction and ammonia will not be made?

Posted from TSR Mobile

Yeah I talked about oxygen as well but didn't know what it would react with

Reply 330

darruma

wow i messed up the bond energy
i got 4722 for one side and 5998 for the other :biggrin:

Reply 331

GNHD

Original post by Roquebrune2014

So did I is -1276 wrong?

Posted from TSR Mobile

Thats right because it shows that the reaction is exothermic

Reply 332

Crobby

I found c3 so so hard and could literally only do a few questions :frown:

Reply 333

JDoza

Original post by FAO_26

Oh so they're not the same papers. Thank god! 😂

Reply 334

darruma

for the speckfic heat capacity i gkt 55.10
i think i got 4.2*0.8*16.4

Reply 335

lilacpotato

Original post by nisha.sri

What did you get for the bond entalphy question i got 2 thousand something. Also for the catalyst of carboxylic i forgot :redface:

I can't remember lol...I think it was an acid catalyst for making an ester if that's what you mean... :smile:

Reply 336

Hasib_332

Original post by lilacpotato

I can't remember lol...I think it was an acid catalyst for making an ester if that's what you mean... :smile:

+1 on acid catalyst

Reply 337

TheConfusedMedic

Original post by nisha.sri

Yeh oh no !! I'm sure it won't mind :wink:

I got 2 thousand something :s-smilie:

Lol yeh that's right i put something very stupid :redface:

Those were the two annoying questions including the energy change one what did you do for that one ?

I'm sure you'll still get 2/3 method marks :h:

What did you put for the catalyst? :lol:

It was only 1 mark so it doesn't matter :biggrin:

For the energy changes one I just added up every single bond energy using the values in the table for one side and then did the same for the other side. Then, because breaking bonds is exothermic and making bonds is endothermic, I did the value on the right side of the equation - the value on the left :smile:

Reply 338

Jollyjules1320

Was it an exothermic reaction we had to draw a diagram for?

Reply 339

username2312801

Original post by surina16

I'm sure you'll still get 2/3 method marks :h:

What did you put for the catalyst? :lol:

It was only 1 mark so it doesn't matter :biggrin:

Yeh i guess lol i put iron coz i got mixed up with the haber process lmao 😂😂😂
that's exactly what i did also for one side did you get 5 thousand something?!