OCR Chemistry A F322 Chains, Energy and Resources Wed 23 May 2012

Reply 1980

Fatima0065

5

Original post by Konshi

What on earth was this diester question? Was it the methanol + epoxyethane?

im so stupid i dre whyrdogen bonds between both molecules loool!! :biggrin:

Reply 1981

Jay Singh

can any one tell me what they put for question of what happens when increase in pressure and temperature

Reply 1982

adamcusirinzon

Original post by Bright

Hydrogen bonding*

Yeah sorry, I wrote hydrogen bonding in the exam just meesed up on here lmfao

Reply 1983

Nick9001

Original post by otrivine

did you get -46 for NH3 did u divide the something -92 by 2?

Yes, by definition it's the formation for one mol - the Haber process produces 2.

Reply 1984

Little Wing

9

Original post by Amz1217

Yeah, I was just wondering, it was reversed so it had to be 250 + positive 92
For the catalysed activation energy question I put down +125 but I'm sure any number lower than +250 is fine?

Yeah any number lower than 200 should be fine imo.

Reply 1985

Bright

11

Original post by otrivine

oh yes i said cause more hydrogen bonding as it has 2 OH groups?

and the question on shape was it 120 ?
'
and the question on CO i said poisonous and higher atom economy?

Yep
Yep
and
Yep

BUT I didn't get how cracking formed alkanes and alkenes :frown:

Reply 1986

emalis123

Original post by v :)

I just genuinely do not know what to make of that paper.
Some bits were hard and others were easy!

You know for the m/z question on the second page, who got C2H3+ for the ion which had the m/z value of 27?

Yeah i got that as well!!
Really confused me though...

Reply 1987

otrivine

14

Original post by Nick9001

Yes, by definition it's the formation for one mol - the Haber process produces 2.

yeppeee!!!

Reply 1988

Giggy88

17

Original post by ying-bear

Shouldnt it be +342 and it can't be -250, cuz activation energy is always positive, since the forward reaction is -92...

Sry confused some of the questions.. Yh it was positive. I think the question was asking how the Ea changes with a catalyst. I said it would be lower ie. +200kj.

How did you get such a specific answers, +342?

Reply 1989

G-Sci

17

Original post by v :)

I just genuinely do not know what to make of that paper.
Some bits were hard and others were easy!

You know for the m/z question on the second page, who got C2H3+ for the ion which had the m/z value of 27?

It didnt ask for an ion it asked for a particle so i dont think the + is needed :smile:

Reply 1990

anuradha_d

1

I still feel like that peak was way too vague to be a carboxylic... i went with ketone...

Reply 1991

StrawberryKoi

12

Original post by v :)

I just genuinely do not know what to make of that paper.
Some bits were hard and others were easy!

You know for the m/z question on the second page, who got C2H3+ for the ion which had the m/z value of 27?

I did, and then a CH3, forming propene? (I think)

Reply 1992

adamcusirinzon

Original post by emalis123

How do van der waals increase when there are more OH groups? I thought this was only for alkanes?
I mentioned hydrogen bonds for some reason... :frown:

This was a typo...in the exam I also wrote hydrogen bonds

Reply 1993

otrivine

14

Original post by Bright

Yep
Yep
and
Yep

BUT I didn't get how cracking formed alkanes and alkenes :frown:

that question i said cause more carbon atoms could be present therefore more different molecules can form?

Reply 1994

fayled

9

For the epoxyethane + methanol questions did anybody get something like propan-1,2-diol?

Reply 1995

Dizzie31

Original post by Amz1217

Yeah, I was just wondering, it was reversed so it had to be 250 + positive 92
For the catalysed activation energy question I put down +125 but I'm sure any number lower than +250 is fine?

yeah i put 200, just anything below i say is fine

Reply 1996

clad in armour

16

got way too many wrong, jan paper was not as hard as this

(edited 11 years ago)

Reply 1997

Nick9001

Original post by mucgoo

Didn't it ask you to draw the isomers post substitution so with an OH group?

Possibly, I don't really remember. :biggrin:

Reply 1998

adamcusirinzon

Original post by fayled

For the epoxyethane + methanol questions did anybody get something like propan-1,2-diol?

Yes, thats what I got!!!!!

Reply 1999

RuksanaBegum

Original post by Bright

Yep
Yep
and
Yep

BUT I didn't get how cracking formed alkanes and alkenes :frown:

That question was why can many products be made, including Alkenes and Alkenes?

I wrote: because it was something like a 10carbon chain, many products can be produced because you can make so many structural isomers and etc.

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

OCR Chemistry A F322 Chains, Energy and Resources Wed 23 May 2012

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