Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 357390 times)

Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2715 on: June 06, 2010, 09:56:41 am »
u got it the wrong way..

sopnification  ( alkaline hydrolysis ) of the fats  will give you  A sodium salt  of carboxylic acid ( soap ) , and glycerol

then if u want the Carboxyic acid from the Na salt, you do acid hydrolsis

hydrolysis is heating under reflux with either acid / alkali

Oh okay, umm so all alkaline hydrolysis will give you a sodium salt of carboxylic acid ?? Like ALWAYS? ???  
;D

Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2716 on: June 06, 2010, 09:57:40 am »
also u have to know acid hyrolysis of proteins and starch ( carbs )
:o  :o  :o  :o r u serious? can you please explain that? Thanks a lott.. :D
;D

Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2717 on: June 06, 2010, 09:58:20 am »
Oh okay, umm so all alkaline hydrolysis will give you a sodium salt of carboxylic acid ?? Like ALWAYS? ???  

alkaline hydrolosis of fat gives you glycers + the sodium salt ,yep and that is the soap !!!!!  

 
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Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2718 on: June 06, 2010, 09:59:03 am »
alkaline hydrolosis of fat gives you glycers + the sodium salt ,yep and that is the soap !!!!!  

 

Oh ryte, thanks, :)
;D

Offline The Golden Girl =D

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2719 on: June 06, 2010, 09:59:50 am »
alkaline hydrolosis of fat gives you glycers + the sodium salt ,yep and that is the soap !!!!!  

 

i see u have been studyin ..cool ....i hope u do well in ur exam ;)
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Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2720 on: June 06, 2010, 10:01:30 am »
also u have to know acid hyrolysis of proteins and starch ( carbs )

Hydrolysis of proteins gives you Amino acids and hydrolysis of starch gives you glucose ryte? Lol i knew that, :P i just freaked out.. :P :P :P ;D
;D

Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2721 on: June 06, 2010, 10:01:52 am »
:o  :o  :o  :o r u serious? can you please explain that? Thanks a lott.. :D

look proteins ( polyamide )  + carbs ( polysacharide , starch )  , if u want to get the monomers ( repeating units ) , we use acid hydrolysis ( heat under refulux with dil. aq HCL )
for protien we get amino acids , for carbs we get monosacharide


but for fats , to get the monemers i.e carboxylic adn the glycers we use Alkalne hydrolsis then acid hydrolisis  ( the opposite to the above^)

Si?
NO secrets to SUCCESS , it is the result of 1.HARD WORK 2.GOOD PREPARATION 3.LEARNING FROM FAILURE
But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward-Balboa

Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2722 on: June 06, 2010, 10:03:16 am »
i see u have been studyin ..cool ....i hope u do well in ur exam ;)
yep im not done yet tho :/ + im just goin over the book and answering ppls qustions :P ( its helping me study !! )
NO secrets to SUCCESS , it is the result of 1.HARD WORK 2.GOOD PREPARATION 3.LEARNING FROM FAILURE
But it ain't how hard you hit; it's about how hard you can get hit, and keep moving forward-Balboa

Offline The Golden Girl =D

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2723 on: June 06, 2010, 10:04:44 am »
yep im not done yet tho :/ + im just goin over the book and answering ppls qustions :P ( its helping me study !! )

niether am i  :-\  ... ya aha  ::) lol  :P  ..it does help  By the way :D
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Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2724 on: June 06, 2010, 10:08:13 am »
look proteins ( polyamide )  + carbs ( polysacharide , starch )  , if u want to get the monomers ( repeating units ) , we use acid hydrolysis ( heat under refulux with dil. aq HCL )
for protien we get amino acids , for carbs we get monosacharide


but for fats , to get the monemers i.e carboxylic adn the glycers we use Alkalne hydrolsis then acid hydrolisis  ( the opposite to the above^)

Si?

Ryte, Thanks a lot yet again. ;)
;D

Offline Hesham Mhd

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2725 on: June 06, 2010, 10:11:16 am »
Guys, can someone explain the content of section 6.2 in the chemistry syllabus? bcuz i rlly dont get anything from it o.o' , plz ppl, any help?  :o

Offline Lariemeeva

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2726 on: June 06, 2010, 10:13:11 am »
Anyone can help me with Chemistry Oct/Nov 2009 P3, Q 5b, c (i) and (ii).
I'm really getting confused, and I'd appreciate an explanation on the whole hydride thing.

Offline igext

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2727 on: June 06, 2010, 10:13:50 am »
look proteins ( polyamide )  + carbs ( polysacharide , starch )  , if u want to get the monomers ( repeating units ) , we use acid hydrolysis ( heat under refulux with dil. aq HCL )
for protien we get amino acids , for carbs we get monosacharide


but for fats , to get the monemers i.e carboxylic adn the glycers we use Alkalne hydrolsis then acid hydrolisis  ( the opposite to the above^)

Si?
are we required to know the molecular structures of fats, glycerol, fatty acids , soap compounds? how about the symbol formula (molecular)?

Offline MasterMath

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2728 on: June 06, 2010, 10:14:16 am »
From which years are you guys solving from past papers =X ?

Offline Girlie45

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2729 on: June 06, 2010, 10:14:48 am »
Hello !  ;D can anyone tell me what we're supposed to know about fuel cells and batteries ???  ???