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OCR Chemistry: Unit F322 (Post exam discussion)

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Reply 40

xxsaraxx7

FoOtYdUdE

Any suitable Base. I wrote NaOH, lol. *summat to do with scrubbers* [neutralising]

I put neutralising but wasnt sure :s-smilie:

!!!

Reply 41

Good Apollo

Crap, seems like I've got the spectroscopy question wrong then.... :facepalm:

This paper felt easier than the one last year though, despite only doing 1 day of revision for it. What did you guys put for "how is ozone maintained in the atmosphere?", did you have to quote the exact wavelengths of light which cause it to be created and destroyed?

Reply 42

Summerdays

Presidential

1) fractional distaillation, separation by boiling points becauses different chain lengths have differen boiling points,

err to be exothemic the enthalpy change that occurs when breaking bonds must be less than the enthalpy change when the bonds of products are made.

anther.... can be reused, 100% atom economy, sustainable, no poisnous gases etc

Damn, I knew I was reading the question slightly wrong. I said for the first question that the Kerosene is seperated due to its hydricarbon length (via a range) in a fractional column.

And for the enthalpy I said that the enthalpy change is exothermic; (heat) energy is absorbed to break the bonds abd energy is released to make the bonds.

Reply 43

major-major-major

What do people think about the grade boundaries? In june it was 75/100 (Raw) for an A.

Higher or Lower?

Reply 44

xxsaraxx7

FoOtYdUdE

I'm almost certain it was a carboxylic acid and not a ketone. Guys did u not see the C-0 peak??????? @ ~ 1200 cm ^-1 or was i hallucinating?>? i'm certain it was propanoic acid.

I got propan-1-ol and propanoic acid too

Reply 45

xxsaraxx7

Overall thought the paper wasnt 2 bad would really appreciate 85% + will see (but hav a bad feelin its not cuz of little mistakes) :angry:

dreadin f324 errrggghhhh

Reply 46

hupper12345

the question that asked to draw out C6 H10 O6..how did you do this?..anyone?

Reply 47

Presidential

major-major-major

What do people think about the grade boundaries? In june it was 75/100 (Raw) for an A.

Higher or Lower?

higher 80 maybe if people did well, or it may just stay the same

Reply 48

Good Apollo

hupper12345

the question that asked to draw out C6 H10 O6..how did you do this?..anyone?

It was a di-ester.

Reply 49

Presidential

hupper12345

the question that asked to draw out C6 H10 O6..how did you do this?..anyone?

I cant remember that, was dat in f322?

Reply 50

nameless_one

im super confused..
is bond making endothermic or exothermic?

Reply 51

Good Apollo

nameless_one

im super confused..
is bond making endothermic or exothermic?

Exothermic.

Reply 52

Presidential

Good Apollo

It was a di-ester.

wasnt it C6H10O4

Reply 53

hupper12345

nameless_one

im super confused..
is bond making endothermic or exothermic?

endothermic= bond breaking
exo= bond making

hmm i think..

Reply 54

thecdon

nameless_one

nah it was deffo two
it say describe bla bla bla... include an equation in your answer

No. I was pretty sure it was just 1 mark, as i remember being surprised.

Reply 55

hupper12345

Presidential

wasnt it C6H10O4

ohh really...might of been...i hated that Question.....this paper was quite hard.

Reply 56

Good Apollo

Presidential

wasnt it C6H10O4

Yeah, I'm assuming hupper12345 was talking about that though.

Reply 57

Presidential

thecdon

No. I was pretty sure it was just 1 mark, as i remember being surprised.

If your talking bout f322 it was 2 marks

Reply 58

FoOtYdUdE

Presidential

there was no OH peak so it was not a carboxylic. Also there was a fragmentation a 45 which is ch3ch(oh)

Actually, COOH+ ALSo = 45! :confused:

Aaaah, i'm certain i saw a C-0. i have a data sheet in front of me cuz i'm revising for unit 4. i'm 110% sure it's propanoic acid! aww, i'm being so stubborn. sorry guys. don't hate me! :o: