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OCR F324-June 2013 Chemistry

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Original post by kuku2013

clothing for nylon and for Kevlar proactive clothing am I missing anything?

Nope, that's what it says in the spec! :smile:

:smile:

Any hard questions anyone? I'm confused on where it'll be difficult

what should I know about degradeable polymers?

Can anyone answer jan 2010 q3 part d please.. Only one mark but haven't got a clue how to do it.. Thanks

Original post by fletchdd02

Yeah, I should've been more specific haha!

:tongue:

Do we need to know it though?
It's not in the spec..?

How do we predict the rention time for alchols and alkanes and esters, any help??

Jan 2012 (q4)

Original post by kuku2013

what is difference between amine and amide?

an amine is an NH2 group and amide is the bond formed when a carboxylic acid ad amine under go a condensation reaction

why do alcohols have a shorter retention time than alkenes

Original post by Chemistry95

an amine is an NH2 group and amide is the bond formed when a carboxylic acid ad amine under go a condensation reaction

so basically bond between amino acids

Original post by 2013leaver

How do we predict the rention time for alchols and alkanes and esters, any help??

Jan 2012 (q4)

esters will have similar retention times as they are similar compounds, alkane will have the longest Rt as is i the most soluable in the stationary phase and the alcohol will have the shortest Rt as it is the least soluble :smile:

:smile:

Original post by Chemistry95

esters will have similar retention times as they are similar compounds, alkane will have the longest Rt as is i the most soluable in the stationary phase and the alcohol will have the shortest Rt as it is the least soluble :smile:

:smile:

I thought alcohols are more soluble due to the present of the -OH group, so can form Hyndrogen bonds with water?

Original post by kuku2013

so basically bond between amino acids

no they could be formed between a carboxylic acid and a amine e.g
CH3CH2NH2 + CH3COOH --> CH3CONHCH2CH3 + H2O

(edited 10 years ago)

OP

what is the purpose of having stationary and mobile phase

OP

Original post by Chemistry95

esters will have similar retention times as they are similar compounds, alkane will have the longest Rt as is i the most soluable in the stationary phase and the alcohol will have the shortest Rt as it is the least soluble :smile:

:smile:

why are alcohols more soluble

Original post by 2013leaver

I thought alcohols are more soluble due to the present of the -OH group, so can form Hyndrogen bonds with water?

the stationary phase in GC is an alkane with a high BP hence an alkane is more soluable in it than an alcohol

Original post by Vhai

Can anyone answer jan 2010 q3 part d please.. Only one mark but haven't got a clue how to do it.. Thanks

valine, glycine, leucine

Original post by Chemistry95

no they could be formed between a carboxylic acid and a amine e.g
CH3CH2NH2 + CH3COOH --> CH3COONHCH2CH3 + H2O

ohh right I see thanks the bond between amino acids is a peptide bond right?

Original post by Varsh05

:tongue:

Do we need to know it though?
It's not in the spec..?

It's in the textbook though. I reckon it's handy to know!

Original post by otrivine

what is the purpose of having stationary and mobile phase

a bit of an ambiguous question, but i think its just simply, stationary phase 'holds the particles' and mobile phase 'sweeps it ' as far as it can.

Original post by fletchdd02

valine, glycine, leucine

Thanks but how did u do that?

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