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OCR F324-June 2013 Chemistry

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Reply 2560
Avatar for Zzzyax
Zzzyax
2
Original post by otrivine
did you do the A* questions in the book?


What is the emperical formula of a phenoxide ion
Reply 2561
Avatar for liamdb
liamdb
Hi guys, what do you think about this:

If you had a molecule structured like an amino acid, except the R group had an amine and a carboxylic acid group on it, would the zwitterion have one pair of charges or two pairs, because it is still neutral overall either way?


Posted from TSR Mobile
Reply 2562
Avatar for narli
narli
anyone got the january 2013 paper and markscheme please?
Reply 2563
Avatar for otrivine
otrivine
OP
14
Original post by Zzzyax
What is the emperical formula of a phenoxide ion


C6H5O-
Original post by Zzzyax
will a phenol react with a carboxylic acid?

Yes in the prescence of an acid catalyst and heat, esterification will take place?
Reply 2565
Avatar for Zzzyax
Zzzyax
2
Original post by otrivine
C6H5O-


Original post by ihatepeople37
Yes in the prescence of an acid catalyst and heat, esterification will take place?

correct
Original post by otrivine
this is where there are 2 optical isomers and only of the isomers are more effective , have the pharmaological effect , the required effect while the other isomer may lead to adverse side effects

This looks correct, my turn :smile:
Reply 2567
Avatar for otrivine
otrivine
OP
14
Original post by Zzzyax
will a phenol react with a carboxylic acid?


Yes because water can be removed right?
Original post by liamdb
Hi guys, what do you think about this:

If you had a molecule structured like an amino acid, except the R group had an amine and a carboxylic acid group on it, would the zwitterion have one pair of charges or two pairs, because it is still neutral overall either way?


Posted from TSR Mobile

Mate .... Your really pushing the boat out now
Reply 2569
Avatar for Zzzyax
Zzzyax
2
Original post by otrivine
C6H5O-



hard A* question


whats the product of reaction between ethanoic anhydride and methylamine
Reply 2570
Avatar for otrivine
otrivine
OP
14
Original post by MathsNerd1
This looks correct, my turn :smile:


Glutamic acid is refluxed with excess ethanol and and concentrated H2SO4 catalyst. Write an equation for this reaction


Glutamic acid is

H2NCH(CH2CH2COOH)COOH
Reply 2571
Avatar for Zzzyax
Zzzyax
2
Original post by otrivine
Yes because water can be removed right?

the reaction will be slow froming an ester
Reply 2572
Avatar for Namod
Namod
10
Does anyone have a list of definitions???????????????????????????????????????????????????
Reply 2573
Avatar for Zzzyax
Zzzyax
2
Original post by otrivine
glutamic acid is refluxed with excess ethanol and and concentrated h2so4 catalyst. Write an equation for this reaction


glutamic acid is

h2nch(ch2ch2cooh)cooh



h2nch(ch2ch2cooh)cooh + ch3ch2oh---> h3n(+)ch(ch2ch2cooch2ch3)cooch2ch3
I will ask again.... What is the reagent and the observation that can distinguish between a ketone and an aldehyde?
Original post by zzzyax
hard a* question


whats the product of reaction between ethanoic anhydride and methylamine


ch3conhch3 + ch3cooh
Reply 2576
Avatar for Namod
Namod
10
Original post by narli
anyone got the january 2013 paper and markscheme please?


I will give it if you thumbs me up
Reply 2577
Avatar for Zzzyax
Zzzyax
2
Original post by ihatepeople37
I will ask again.... What is the reagent and the observation that can distinguish between a ketone and an aldehyde?

tollens reagent, formed by NaOH and AgNO3 with NH3
Reply 2578
Avatar for otrivine
otrivine
OP
14
Original post by Zzzyax
hard A* question


whats the product of reaction between ethanoic anhydride and methylamine


the product would be ethanoic acid and NH3+CH2CH3

very hard
Reply 2579
Avatar for Zzzyax
Zzzyax
2
Original post by _HabibaH_
ch3conhch3 + ch3cooh



great!

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