[lamalas600]

(Original post by kurdabora)
Will A be round 76?


This was posted from The Student Room's iPhone/iPad App

Yes an A will be 76

[A level Az]

That is a terrible unofficial mark scheme in the OP. Does anyone have a proper one that briefly outlines what the question was and has the marks for each question?

[kookyuke]

(Original post by EllaBella<3)
Why can't you use silver nitrate? A white precipitate of AgCl would form whereas nothing would happen in the other test tube.

no I meant that I wrote a different acid- usually silver nitrate is acidified with nitric acid and I wrote sulphuric acid- does anyone know if I'd still get the mark?

[lamalas600]

(Original post by A level Az)
That is a terrible unofficial mark scheme in the OP. Does anyone have a proper one that briefly outlines what the question was and has the marks for each question?

Yes one second, will just phone up aqa and ask for one

[tinzoo]

(Original post by Josh1993)
Unofficial mark scheme.

1a)

i)0.47,0.170
ii)sraightforward.
iii)equal amount of mols on both sides.
iv)52.1

b)

i) D
ii)B
iii)A
iv)C

2) 4.5*10^-4
4.5*10^-3
4.33*10^-2

b) rate = 4.44 mol^-2dm^6s^-1

a) proton donor.

b) i) ii) iii) BBAABA in that order.

c) 37.8 cm^3

d) i) 4.52
ii) standard
iii)2.64
iv)4.48.

4 a) mechanism as standard (methylpropanoate)
b) i)1,5-pentanediol
ii) simple enough.
iii) base hydrolysis (base is usually ignored). acts as nucleophile blah blah

c i) ethanoic acid
ii)not sure.nucleophyllic addition-eleimination.
iii) no HCl , not as vigourous etc....

d) can't draw

e) i ) ester
ii) i count 10 but think i may be wrong.
iii) look at formula sheet.

f) i) 2nd one and last one( not sure again)
ii) pink ------> colourless

5) a)Nuclephyllic addition.
B)2-Bromobutanenitrile
c) NH3 , Excess , nucleophyllic substitiution.
d i) zwitterion
ii) stronger forces of attraction , Vdw in the other molecule etc....

e) i) NH2CH2COOCH2CH3
ii) COH(CH3)2CONH2
iii) NH2CH2CH2CH2COOH
iii) CH3CH2CH(N(CH3)2)COOH hard without drawing

6 a) AlCl3 + CH3COCl -----------------> [AlCl4]- + CH3CO+
AlCl4 - + H+ ---------------> AlCl3 + HCl
Phenylethanone

b) C6H5CO+
c) Inductive effects?? I should really know this but oh well.

7 a) propan-1-ol conc H2SO4 orange-----> green
propanal , fehlings/tollens , brick red PPT, silver mirror
propanoic acid , Na2CO3 , Effervesence(CO2)
Chloropropane , dil HNO3 , NaOH , AgNO3

b) oxidation, state wavenumber of c=o,diffrent affinites/solubilities.

8) 1,4 dinitrobenzene
1,2 dinitrobenzene

double bond with 4 methyl groups around it.
cyclocompund (cyclohexane)

see post on next page(someone uploaded pictures.))


3 ethyl groups as bonded to N.
c(CH3)3NHCH3

Feel free to amend and add to this as some questions I dont know (only a couple). This is very rushed so likely to be mistakes.

for question 7 b) would they accept if u said they have different speed depending on the relative solubility between two phases? :/ for 1 mark?
also for b ii) i cant remember exactly what i wrote but i remember saying how carbon on the c=o is attaked by naoh ...would that get me any marks?

[A level Az]

(Original post by lamalas600)
Yes one second, will just phone up aqa and ask for one

Hilarious. Though seriously, if you look at unit 2 chemistry and other post exam threads, they have much better unofficial mark schemes than the one in the OP, I'm not just being a dick.

[zoeaw]

(Original post by A level Az)
Hilarious. Though seriously, if you look at unit 2 chemistry and other post exam threads, they have much better unofficial mark schemes than the one in the OP, I'm not just being a dick.

I think because someone uploaded the whole paper so there was no point adding questions and stuff to the mark scheme..

[kurdabora]

(Original post by A level Az)
Hilarious. Though seriously, if you look at unit 2 chemistry and other post exam threads, they have much better unofficial mark schemes than the one in the OP, I'm not just being a dick.

If you look at the other unofficial mark schemes or like chem2 you will see that a Chem teacher made it. This wasn't.


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[SashaLuLu]

(Original post by lamalas600)
Yes an A will be 76

hey, just wondering, how come you think an A will be 76, when it was 79 in jan?

[Parle à ma main]

I thought this exam was challenging, now I know it was absolute child's play compared to unit 5

[tobnot]

(Original post by Parle à ma main)
I thought this exam was challenging, now I know it was absolute child's play compared to unit 5

Completely agree, CHEM5 was evil!

[Parle à ma main]

(Original post by tobnot)
Completely agree, CHEM5 was evil!

Tell me about it. I'm honestly going to be lucky to get a D in Chem5. I hope it makes the news and the grade boundaries are lowered.

[Saphire_93]

(Original post by Parle à ma main)
Tell me about it. I'm honestly going to be lucky to get a D in Chem5. I hope it makes the news and the grade boundaries are lowered.

Completley in the same boat as you! Need a B for university at least, but that does really not seem likley! At least the grade boundries are going to go down because of all the bad press this new examiner is getting (hopefully).

[MustyQ]

please can anyone post the aqa chemistry unit4 paper for june 2012?
pleasee reaally need it

[shuaib786]

(Original post by MustyQ)
please can anyone post the aqa chemistry unit4 paper for june 2012?
pleasee reaally need it

I have the paper bro, i have to email it to you, as the file is too big to upload it onto here. So just pm me your email address. Then i will send it to you.

[Soul_Eater]

please can someone post the markscheme for CHEM 4 and CHEM 5 June 2012 please !! thxxx

[shuaib786]

(Original post by Soul_Eater)
please can someone post the markscheme for CHEM 4 and CHEM 5 June 2012 please !! thxxx

Here u go. I got the question paper for chem 4, but its too big for me to upload onto here. Btw i dont have the chem 4 mark scheme.

[Doctor.]

(Original post by shuaib786)
Here u go. I got the question paper for chem 4, but its too big for me to upload onto here. Btw i dont have the chem 4 mark scheme.

Hey, how did you get on with the exams?

[shuaib786]

(Original post by Doctor.)
Hey, how did you get on with the exams?

Yeah they were good, you?

[Doctor.]

(Original post by shuaib786)
Yeah they were good, you?

They went okay Got a B in CHEM4! Although I found it really hard, so I'm happy