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OCR F324-June 2013 Chemistry

Reply 2000

JimmyA*

5

I reckon there will be a big combined techniques question at the end. Hopefully there is :smile:

Reply 2001

printergirl

13

Original post by D4rth

If its more soluble in the stationary phase it has a longer time as its harder for the mobile phase to carry it through the column.
It depends on what the greater solubility is in, if its more soluble in the mobile phase retention time is shorter.

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thanks could you explain for both tlc and gas
is tlc always adsorption?
in tlc if its more soluble/adsorpable(?) in stationary phase will rf value be greater, same with gas chromotography retention time greater

Reply 2002

Sly1

6

Original post by thers

One more

How many chiral centres in this molecule? [1]

Is it 1?

Edit: I saw your answer

Reply 2003

RoryH

13

Original post by thers

One more

How many chiral centres in this molecule? [1]

is there 0?

Reply 2004

thers

5

Original post by otrivine

why do you have blue and red? do they mean separate dont get why they are coloured

Lol I just randomly chose this molecule from google images - I don't know why they are coloured (probably to show the distinct functional groups.

Reply 2005

V__005

17

Can anyone help me with this?
Describe and explain the increased use of esters of fatty acids as biodiesel.

Reply 2006

D4rth

9

Original post by thers

Answer

Spoiler

Why is it 0?

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Reply 2007

AFC_123456789

2

Original post by D4rth

NH and OH always appear as singlets.

Watch this video
https://www.youtube.com/watch?v=k6F__pysc74&feature=youtube_gdata_player

Posted from TSR Mobile

that video is amazing but how does he know how big to make the peaks when he draws them? Thanks.

Reply 2008

D4rth

9

Original post by AFC_123456789

that video is amazing but how does he know how big to make the peaks when he draws them? Thanks.

They're just relative, the peak with 3 protons in the environment will be bigger than the peak with 2 protons in the environment. I don't think the examiners will be that picky though.

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Reply 2009

wakaas

Any predictions on what might come up

Reply 2010

_HabibaH_

8

Original post by Varsh05

Can anyone help me with this?
Describe and explain the increased use of esters of fatty acids as biodiesel.

Biodegradable - breakdown doesn't emit harmful gases.
Made form plants so carbon neutral/environmentally friendly.

How many marks is it?

Reply 2011

kuku2013

Original post by D4rth

I assume you mean Jan 13? Its been posted many times, check the last few pages, it'll be in an attachment.

Posted from TSR Mobile

yeah my bad!! thanks

Reply 2012

thers

5

Original post by D4rth

Why is it 0?

Posted from TSR Mobile

Lets look at the carbon with the NH2 group sticking out of it. The groups coming out are -NH2, -H, -CH2CH2CHOH and -CH2CH2CHOH. Same can be said for the carbon with OH sticking out but swap the OH with NH2. So those 2 carbons are not chiral

Reply 2013

V__005

17

Original post by _HabibaH_

Biodegradable - breakdown doesn't emit harmful gases.
Made form plants so carbon neutral/environmentally friendly.

How many marks is it?

It's just a question from the spec that we're supposed to know.

Reply 2014

_HabibaH_

8

Just did Jan 13 - scored 85 and in Jan I just scraped a C. I don't know whether to be crazy happy or crazy confused.

Reply 2015

livvy965

Just me or is it anyone else's last exam and I've lost all motivation

HELP

Reply 2016

V__005

17

Original post by _HabibaH_

Just did Jan 13 - scored 85 and in Jan I just scraped a C. I don't know whether to be crazy happy or crazy confused.

Is that 85 UMS lol?

Reply 2017

D4rth

9

Original post by thers

Lets look at the carbon with the NH2 group sticking out of it. The groups coming out are -NH2, -H, -CH2CH2CHOH and -CH2CH2CHOH. Same can be said for the carbon with OH sticking out but swap the OH with NH2. So those 2 carbons are not chiral

Oh dammit, I'm used to more complex molecules where the things on either side of the chain are completely different. Thanks

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Reply 2018

livvy965

Original post by _HabibaH_

Just did Jan 13 - scored 85 and in Jan I just scraped a C. I don't know whether to be crazy happy or crazy confused.

Jan 13 was a bitch of a paper did it for our mock got a C or something dismal

Reply 2019

JimmyA*

5

Original post by livvy965

Just me or is it anyone else's last exam and I've lost all motivation

HELP

It's mine as well and I had maths this morning and really just can't concentrate. I'm downing coffee and coke trying to get as much caffeine as possible :smile:

OCR F324-June 2013 Chemistry

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