AQA CHEM 1 (unofficial) Mark Scheme

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Reply 20

Mojojojo

Why is it thermal cracking? I thought it was an Alkane?

Reply 21

firoza59

guys what grade is 36??

Reply 22

MediterraneanX

For the PV/NRT question I rounded up some answers throughout the process to three significant figures, I got the process right but ended up getting something 2.17g instead of 2.78 due to where I'd rounded up. Will they penalise me for doing this?

Reply 23

king101

Kocker could you upload the paper please?

Reply 24

MediterraneanX

Original post by Mojojojo

Why is it thermal cracking? I thought it was an Alkane?

It referred to X which was an alkene (which is made by thermal cracking) :smile:

Reply 25

firoza59

what is 36?? what grade is that

thats like a D

Original post by sososososxc

thats like a D

oh peak what did you get?

Reply 28

Aftab888

For 2)d)i)

Do you think they would accept HCl as one of the other answers on the offical markscheme? :smile:

Reply 29

Mystic Creature

Original post by MediterraneanX

Ooh that is quite a bit off, so you'll probably get 3/5 i think..

Reply 30

SilverArch

Original post by Aftab888

For 2)d)i)

Do you think they would accept HCl as one of the other answers on the offical markscheme? :smile:

I don't think so - if you added HCl to that alkene, you would not have produced the alkane drawn, you would have made a haloalkane instead

I think I've done pretty well. I put catalytic cracking where I should have put thermal cracking so there's one gone. Can see a couple of other marks I'm pretty sure I've lost, but overall it went well :smile:

Since that was a resit after last summer, I'm feeling quite relieved now!

Reply 31

golden_lion

I think I've done better than I did in January, but it's nowhere near what I need for the unis I want to apply to. Just have to hope I do better on unit 2, and that my ISA mark pulls them up. D:

Reply 32

chill543

Original post by Mystic Creature

I wrote neutralisation instead of flue gas desulfurisation..hopefully they give the mark! :smile:

Thanks for this btw

i didnt have a CLUE for this one (luckly alread have a low A in it though) - so i wrote...... sepearation :rolleyes:

Reply 33

pinpin95

for q.2 ii) i put down
Rb+(g) --> Rb(g) + e-
:frown:

Reply 34

cuckoo99

made some silly mistakes :/ and surely saying just 'ionic' for 4d is wrong as it asks for the the crystaline structure so surely it would be giant ionic lattice?

Reply 35

samedi_

I wrote for question 5d that you could separate the HCl made back into hydrogen and chlorine and use hydrogen within the reaction again as the reagent.. Would that be acceptable?

Reply 36

tony_dolby

Original post by samedi_

I wrote for question 5d that you could separate the HCl made back into hydrogen and chlorine and use hydrogen within the reaction again as the reagent.. Would that be acceptable?

This isn't a recognised use of HCl, but you seem to have the right idea. Selling HCl, using it to make hydrochloric acid etc. will all score here, but I'm not sure that your answer will.

Reply 37

tony_dolby

Original post by cuckoo99

made some silly mistakes :/ and surely saying just 'ionic' for 4d is wrong as it asks for the the crystaline structure so surely it would be giant ionic lattice?