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OCR Chemistry F322~ 4th June 2013~ AS Chemistry

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For the flame question on why it was a yellow or blue flame

I put its because there's a supply of oxygen so it's an complete combustion so gas is being produced (Co2)

For people who put incomplete combustion I don't understand how because Incomplete releases Carbon Monoxide and its a colourless gas :s

Incomplete combustion also produces carbon which burns yellow and is black not just carbon monoxide

Reply 2861

yodawg321

Did anyone got S8 for the mass spec question?

Reply 2862

jacobfun

Original post by jacksonmeg

isnt it 240/24 = 10 moles, 2 moles = 134 or whatever it was, so 5x134= 1670

The 2 before N20 doesn't mean 2 moles, I think I just multiplied by 10.

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Reply 2863

Dizzie31

One of the easiest papers i've done so far! grade boundaries should be high. What do you guys think!

Reply 2864

Farringtonn

Original post by Parrot654

what did people put for the way that the equilibrium shifted?
with temp
with pressure
with catalyst :smile:

Left left unchanged

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Reply 2865

irfymahmood

Original post by jacksonmeg

for the box question, ketone, ester, 2 different alkenes right ?

yepp thats what i got

Reply 2866

niceguy95

Original post by Farringtonn

What did people do for the radical substitution?

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IBr -------> I + Br initiation
Br + Ch4 ---------> HBr + CH3 propagation
Ch3 + IBr -------> Br + Ch3I propagation

Ch3 + Br --------> Ch3br. Termination

Homolytic fission

Free radical substitution

Reply 2867

jadeymas

Original post by Zzzyax

i think i got 98/99 maybe 91 for an A

lol pipe down

Reply 2868

FLLF

Original post by kingmango

I swear I got like +820 for the 24dm3 question? Anyone else get that? :frown:

Nah, it was 1640

Reply 2869

Dizzie31

Original post by jacobfun

The 2 before N20 doesn't mean 2 moles, I think I just multiplied by 10.

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Nah you times it by 5

Reply 2870

daisyrchds

Original post by kingmango

I swear I got like +820 for the 24dm3 question? Anyone else get that? :frown:

i did 240/24=10 then something like 164/10 = 16.4 :s-smilie:

Reply 2871

massi1296

could you say radical substitution or did you have to say free radical

Reply 2872

Dizzie31

Original post by FLLF

Nah, it was 1640

thats right, you times it by 5 not 10, the original one had 2 moles already.

Reply 2873

CRW1996

Original post by yodawg321

Will they allow HCFs instead of HCFCs?

Maybe, they're called HFCs. I think they will let you off

Reply 2874

DarkWillow

Original post by jacksonmeg

for the box question, ketone, ester, 2 different alkenes right ?

Yep, thats right :smile:

Reply 2875

alice.o123

Original post by Ray..

What did everyone write for the propagation
Steps + the one termination steps
From what I can remeber I did
CH4 + Br. -> CH3 + HBr
Ch3 + IBr ->> CH3I + Br.

Termination
CH3. + Br. --> CH3Br
That's right right ??

that's what I put :biggrin:

There are quite a few termination steps for this reaction, you could have had
CH3. + Br. --> CH3Br
CH3. + I. --> CH3I
CH3. + CH3. --> C2H6
I. + I. --> I2
Br. + Br. --> Br2
I. + Br. --> IBr
as long as two radicals came together to form one product that is not a radical it's a termination step i think