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OCR Chemistry F322~ 4th June 2013~ AS Chemistry

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Reply 2960

nothepreacher

Original post by jacksonmeg

I put S8, then S4 for the next 1 :smile:

Did you forget putting the + charge on S lke me because we would not get marks for that?

Reply 2961

alice.o123

Original post by _Morsey_

Although thinking about it again, i suppose the termination of two I radicals produces I2, so it might work :/

it should be allowed tbh, because you will form I2, and it is possible for the I2 molecules to react with other radicals in propagation steps, it's not the most obvious propagation step, though if the reactants are still exposed to UV light(?) causing the IBr to split in the first place it would probably split up I2 as well

Reply 2962

massi1296

Original post by jacksonmeg

I put S8, then S4 for the next 1 :smile:

[INDENT] did you have to put s4+ cos i just put s8 and s4 aswell
[/INDENT]

Reply 2963

daisyrchds

Original post by Farringtonn

The question where you had to use mcdelta t, in the first part did you have to divide by 1000 because it said kilo joules

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yeah

Reply 2964

kingmango

I ended up writing 2-ethyloctane for the branched 10C molecule because i didn't know whether nonane was a word :tongue:

Reply 2965

irfymahmood

Original post by Farringtonn

The question where you had to use mcdelta t, in the first part did you have to divide by 1000 because it said kilo joules

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yes you had to

Reply 2966

LucieR

Original post by Tania2k9

i'm so worried now, i said homolytic fission, named the reaction mechanism as free radical substitution and name the 2 steps as initiation and propagation. i did the same initiation step as you but i was confusing my self on the prop step i wrote: CH4 + Br---> CH3 + HBR
then i did : CH3+I2----> CH3I +HI
and for the termination: CH3 + CH3---->
out of 7 what do u think that'd be?

thank you

For propagaton i wrote CH4 + Br ---> CH3 + HBr then CH3 + BrI ---> CH3I + Br as bromine was acting as the catalyst so had to be regenerated...
You didnt give a product for the termination though so i would say 5 marks :smile:

Reply 2967

walkers38

Original post by krishkmistry

Was the flowchart where heated with acid catalyst the e and z isomers ?

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I was thinking of that but then it has + in between boxes. So I just put H2O in the other box :mad:

Reply 2968

jacksonmeg

the question where it asked your for the difference bwteen I and J, the e/z thing, is it ok if you only drew the part with the double bond to show the difference?

Reply 2969

Dizzie31

Original post by massi1296

yeah so youd get 3280 for 2 moles therefore 1640 for 1

nope you divide it first, this is a similar question to the jan 2013 paper

Reply 2970

massi1296

i think the s8 wasnt a fragment ion so i think it was s8 but i forgot the + on s4 too

Reply 2971

username1107833

Original post by krishkmistry

Found this exam weird - found it bloody easy then I found it hard but two questions ? Was the Cfc alternative hydro fluorocarbons - was the energy in moles 820 and was the structure on the spectra butanal and butanone since there weren't oh bonds ? Three questions actually

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CFC Alternative I put CO2 but I heard it is HCFC's. Yeah the enthalpy for making 240cm^3 of NO2 was 820, enthalpy of formation of NO2 was 82, and the two structures was butanal and butanone.

Reply 2972

Farringtonn

Original post by jacksonmeg

i did the exact same molecule, (didnt know what 9 carbons was called lmao)

Omg same

I was thinking nonane but wanted to be safe!

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Reply 2973

Dizzie31

Original post by jacksonmeg

the question where it asked your for the difference bwteen I and J, the e/z thing, is it ok if you only drew the part with the double bond to show the difference?