Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 350955 times)

Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2700 on: June 06, 2010, 09:25:18 am »
Thanks :) and sometimes a question asks us to differentiate between additional polymers and condensation polymers, so how do we do tht? I noe one is condensation polymers give out water, and theres something abt the monomers ryte? ???

the first reason i gave above

the second reason :

monomers of addition polymers  can only have a DOUBLE BOUND  >c=c<
monomers of condesation polyemers can be made of 2 differnet monomers and can have >c=c<  sometimes
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Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2701 on: June 06, 2010, 09:28:07 am »
I dont think so :-\, never learned that, and never seen it in my book,

confirm anyone


Wait, im sorry, Helium and Nizzz ----> u need to know that as you go down the fractions, (i) the no. of carbon atoms increases, (ii)) it gets less flammable and (iii) its boiling point and melting point increases.

 
;D

Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2702 on: June 06, 2010, 09:29:06 am »
the first reason i gave above

the second reason :

monomers of addition polymers  can only have a DOUBLE BOUND  >c=c<
monomers of condesation polyemers can be made of 2 differnet monomers and can have >c=c<  sometimes

Ryte, thanks a lot :)
;D

Offline MasterMath

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2703 on: June 06, 2010, 09:34:22 am »
Is this how you draw starch?

-(-O--[     ] --)n-
Thanks

Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2704 on: June 06, 2010, 09:36:15 am »
Is this how you draw starch?

-(-O--[     ] --)n-
Thanks
yep glucose , starch and cellulose! ( carbohydrates  )
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Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2705 on: June 06, 2010, 09:36:49 am »
Is this how you draw starch?

-(-O--[     ] --)n-
Thanks

-(-O--[]--O--[]--O-)n-  
I learnt it like this. :)
;D

Offline Vin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2706 on: June 06, 2010, 09:39:02 am »

Offline Helium

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2707 on: June 06, 2010, 09:45:35 am »
Wait, im sorry, Helium and Nizzz ----> u need to know that as you go down the fractions, (i) the no. of carbon atoms increases, (ii)) it gets less flammable and (iii) its boiling point and melting point increases.

 

Oh yes thank you, i know that,

i thought like the X number of carbon in it ;D
Aiming for the top

Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2708 on: June 06, 2010, 09:46:58 am »
Ryte guys, just confirming here,

In hydrolysis, all we need to know is that fats and oils can be hydrolyzed into glycerol and fatty acids using dilute acids (acid hydrolysis) and they can be hydrolyzed into glycerol and the salt of the acid by using an alkali (alkaline hydrolysis or saponification), and the salts of the higher fatty acids are called soaps.

Umm, this is all we need to know abt hydrolysis, right? ???
Thanks a lot guyss.. :D  
;D

Offline NidZ- Hero

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2709 on: June 06, 2010, 09:48:45 am »
Wait, im sorry, Helium and Nizzz ----> u need to know that as you go down the fractions, (i) the no. of carbon atoms increases, (ii)) it gets less flammable and (iii) its boiling point and melting point increases.

 

thanks alot raywin but i was askin lke do we need 2 noe de no. of carbon in pertroleum , etcc

Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2710 on: June 06, 2010, 09:49:40 am »
thanks alot raywin but i was askin lke do we need 2 noe de no. of carbon in pertroleum , etcc

No, u do not need to know tht. :)
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2711 on: June 06, 2010, 09:52:02 am »
Ryte guys, just confirming here,

In hydrolysis, all we need to know is that fats and oils can be hydrolyzed into glycerol and fatty acids using dilute acids (acid hydrolysis) and they can be hydrolyzed into glycerol and the salt of the acid by using an alkali (alkaline hydrolysis or saponification), and the salts of the higher fatty acids are called soaps.

Umm, this is all we need to know abt hydrolysis, right? ???
Thanks a lot guyss.. :D  
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
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Offline NidZ- Hero

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2712 on: June 06, 2010, 09:53:13 am »
C2H6 + 3.5O2 -------->  2CO2 + 3H2O

After you form the above equation do this:

90g / (24+6) = 3 moles of ethane

2*3 moles = 6 moles of CO2 (using the molar ratio)

6*24 = 144 dm3
thanz a lot ari By the way ethene is gas y nt use this volume/ 24dm3
okko may be dey say its grams rght

thanz anyways

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2713 on: June 06, 2010, 09:54:19 am »
thanz a lot ari By the way ethene is gas y nt use this volume/ 24dm3
okko may be dey say its grams rght

thanz anyways

WHen they say grams just assume it is a solid. FORGET EVERYTHiNG ELSE :P

No problem, always around to help ;)


Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2714 on: June 06, 2010, 09:54:55 am »
also u have to know acid hyrolysis of proteins and starch ( carbs )
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