IGCSE/GCSE/O & A Level/IB/University Student Forum
Qualification => Subject Doubts => IGCSE/ GCSE => Sciences => Topic started by: holtadit on November 02, 2009, 01:09:13 pm
-
Glucose can be represented as
_
HO-l_l-OH
Draw the structure of a more complex carbohydrate that can be formed from
glucose by condensation polymerisation.
How do u answer this question ? What is the answer ?
-
it will be
_ _
(-l_l-O-l_l-)n
u just have to remove the hydrogen from both side and continue it from both side.....this will show an ester grouping which is what a carbohydrate is made up of....
-
exactly adi.\
it does not matter whether it i glucose or ethene
u simply break the double bond.
then extend it past the brackets
then put n at the end.
thats all there is to it.
-
thanks people
-
ur welcome!!
-
it will be
_ _
(-l_l-O-l_l-)n
u just have to remove the hydrogen from both side and continue it from both side.....this will show an ester grouping which is what a carbohydrate is made up of....
_ _
Starch is not an ester. Fats have ester linkage. Remember ester linkage is (-l_l-OCO-l_l-). Ester link requires both Carboxyl group and the Alcohol group to be present in the monomer(s).
-
YAYA!!!!!
ok chill man!!!!!
i m sorry for writing so...just slipped away from my mind!!!
ps eightas wud u mind talking a bit more politely plsss....i saw u on the other thread as well(A*)
its cool that u know the stuff and u are trying to correct people for their benefit...but it wud better if u used a rather softer tone!!!
dont take it personally...its just an advice...rest is upto u!! :)
-
YAYA!!!!!
ok chill man!!!!!
i m sorry for writing so...just slipped away from my mind!!!
ps eightas wud u mind talking a bit more politely plsss....i saw u on the other thread as well(A*)
its cool that u know the stuff and u are trying to correct people for their benefit...but it wud better if u used a rather softer tone!!!
dont take it personally...its just an advice...rest is upto u!! :)
8) :D ;D :) I did not intend to offend you dude. I apologize if you have been offended. But I just wanted to correct you, but why do you find it offensive. Yeah. Okay, I'll remove "Wong". That was quite unnecessary.
-
lolzz...man m not offended at all...u my friend...y wud i be offended....
nthng with the "WRONG"...
its just that ur tone seemeed to be quite harsh so i told ya...not much here but in the other post...it was way too harsh...
told ya in gud intentions man!!! :) :)
-
Glucose can be represented as
_
HO-l_l-OH
Draw the structure of a more complex carbohydrate that can be formed from
glucose by condensation polymerisation.
How do u answer this question ? What is the answer ?
it shud be similar to the diagram attached
i know u guyz have answered it, but still for a diagram
and yea...as it is condensation polymerization, the bi-product would be x-molecules of water ..find it attached ...
if y is the number of glucose molecules which combine to form the polysaccharide....
x = y-1
that means there will be y-1 molecules of water formed
-
neat diagram aadi...
but i think u shud change the middle carbon containing molecule to a box...it luks more like 3 O's together
-
neat diagram aadi...
but i think u shud change the middle carbon containing molecule to a box...it luks more like 3 O's together
edited. guess u guyz 4got abt water.. :P
-
not forgot...but i thot it wasn't required here...i thot it was obvious for Ari to know that!!!
bt i realise i shud have sadi that too for a complete answer...
-
could someone draw the displayed structural formula of the compound formed when propene reacts with hydrogen chloride.
AND
Can someone also draw the displayed structural formula of Poly(propene) ?
Thanks ppl.
-
come on ppl please help me !!
Read the above post.
-
propene + HCl = Propene Chloride + hydrogen!!
stucture on its way!!
-
could someone draw the displayed structural formula of the compound formed when propene reacts with hydrogen chloride.
AND
Can someone also draw the displayed structural formula of Poly(propene) ?
Thanks ppl.
when propene reacts with HCl!!
i'm not sure of that...did u mean when it reacts with chlorine or bromine instead of HCl
and eya for the second one
find the diagram attached
-
i guess i was wrong!!
it is CH2CH CH3 + HCl = CH3CHClCH3
DIAGRAM ATTACHED!!!
-
agreed aadi...it shud be propene with Cl2 which will give us C3H5Cl and HCl
-
agreed aadi...it shud be propene with Cl2 which will give us C3H5Cl and HCl
yaa..true..
-
A@di is it alright if for poly(propene) i drew this (1st attachment)
and this is the structure i got for propene chloride (2nd attachment). I got two possible structures (one at the top and one at the bottom of the picture).
so which is correct ?
-
why isnt my ans rite???
it can be as i said also rite???
wait i guess diagram is wrong!!
i'll update it!!
-
yes, u can draw that way too..
but ari, i'mnot sure abt the propene + acid...t shud be ...propene + chlorine...check th q again..which year is it?
-
yes, u can draw that way too..
but ari, i'mnot sure abt the propene + acid...t shud be ...propene + chlorine...check th q again..which year is it?
Go to Question 7 c iii
The MS is attached too.
-
7 c)ii) is different in the question ppr provided...
it says "Give the structural formula and name of the alcohol formed when but-1-ene reacts
with steam."
r u sure this is the one??
-
7 c iii
Its triple i not double i
-
7 c)ii) is different in the question ppr provided...
it says "Give the structural formula and name of the alcohol formed when but-1-ene reacts
with steam."
r u sure this is the one??
Did u get the right question now ???
-
yup i got it!!
will let u know in some time!!
-
okay, dont leave me hanging man !!!
:D ;)
-
its just dat i m in the middle of completing my french practice paper....will get back to u after that for sure...
-
okay what is the displayed structural formula of poly(butene) ?
-
hey really sorry ari...just forgot about it yesterday
so yeah...i saw the question...so basically...the diagram that u have made on the last page are correct...both are correct as they are isomers so both will be accepted for sure.....
ur second question....poly(butene)
its simple u just take butene....nd remove the double bond...here is a daigram
H H H
| | |
H-C-C=C-C-H this is butene
| | |
H H H
now rearrange this to move the last methyl group (CH3) below and transfer one of the double bonds to the right to make it a continuous chain
H H
| |
(-H- C -C - C -)n this is poly(butene)
| | |
H H H-C-H
|
H
or this can be simply written as
(-CH3-CH2CH-)n
|
CH3
-
So is this correct too ? Would an IGCSE examiner except it ?
If it is WRONG then explain to me how u got the CH3 for poly(propene) and how i should be drawing the repeat units for polymers.
-
propene is

ok look at the diagram
the first when the first CH2 is put from
;
remains
next one has a C with a H bond on top and methyl at the bottom
When the C and H bond is drawn from
remains only
because 1 C and 1 H is gone..
to form a polymer just remove the double bond and extend the lines outside
-
lol...nice name dude...ari ari ari.bmp !!!lol
-
lol...nice name dude...ari ari ari.bmp !!!lol
lol..actually i want to dedicate that song to my friend ari...
@ari - listen to this song -> bombay rockers - ari ari ari
i'm not kiddin , it is a song..check it..no offence :D
-
lol..actually i want to dedicate that song to my friend ari...
@ari - listen to this song -> bombay rockers - ari ari ari
i'm not kiddin , it is a song..check it..no offence :D
Ill check the song out.
But is my diagram of poly(butene) correct ? because i followed the same method that A@di just explained.
-
its a coooooool song...really like it....specially the remixed one with overseas!!!awesome
-
Ill check the song out.
But is my diagram of poly(butene) correct ? because i followed the same method that A@di just explained.
yes ari , that shud be correct..
but lemme suggest u something
always...a methyl group i.e
is better to show in a polymer than an ethyl i.e
or any other alkyl
for that just make one more CH2 and insttad of an ethyl hanging make it to a methyl
-
i agree with aadi....try to put methyl group....a better idea.more widely accepted...
-
yes ari , that shud be correct..
but lemme suggest u something
always...a methyl group i.e CH_3 is better to show in a polymer than an ethyl i.e C_2H_5 or any other alkyl
for that just make one more CH2 and insttad of an ethyl hanging make it to a methyl
Point noted. Sorry for asking so many questions guys and thanks for helping me out. But i have one last question:
Is this the correct diagram for the following question?
The synthetic polymer, nylon, has the same linkage as proteins. Draw the structural
formula of nylon.
-
ends split open...the double bond opens....m havin my food nw...will draw and reply asap
-
yah its correct ari!!!!
just put a dash(-) on the 2 brackets on the side to show continuation....
-
Why does nid404 say that the double bonds break open ???
-
(-NH-[ ]-CO-)n
-
no idea ari...hey nid...y r u talking about double bonds here...there are no double bonds in the monomers of nylon...
-
@nid , adi etc. - 1 doubt plz...there r 2 different boxes right in nylon..i mean how can CO and NH be round 1 box..
wait , i'll upload my image somewhere ..its taking time here...
check this link
i have uploaded the image here
http://filesmelt.com/downloader/ari_ari_ari.bmp
-
Why does nid404 say that the double bonds break open ???
sryy I mistook it for a normal polyester such as ethene...ws in a hurry,..wanted to go for dinner :D......so the double bond implied was for somethin like polyethene where it splits open...and becomes single
-
@nid , adi etc. - 1 doubt plz...there r 2 different boxes right in nylon..i mean how can CO and NH be round 1 box..
wait , i'll upload my image somewhere ..its taking time here...
check this link
i have uploaded the image here
http://filesmelt.com/downloader/ari_ari_ari.bmp
dude...although this is not in course bt just to let u know..
Nylon-6 has only one box cuz its monomer Caproic acid has both amide and carboxylic grouping...
the one that u have drwan is Nylon-6,6
-
sryy I mistook it for a normal polyester such as ethene...ws in a hurry,..wanted to go for dinner :D......so the double bond implied was for somethin like polyethene where it splits open...and becomes single
plzz answer my doubt
how can it be CO[ ]NH
it shud be ----CO[ ]CO-NH{}NH-------
@adi - did ari mention abt nylon-6 or nylon6,6 ??
-
sryy I mistook it for a normal polyester such as ethene...ws in a hurry,..wanted to go for dinner Cheesy......so the double bond implied was for somethin like polyethene where it splits open...and becomes single
plzz answer my doubt
how can it be CO[ ]NH
it shud be ----CO[ ]CO-NH{}NH-------
@adi - did ari mention abt nylon-6 or nylon6,6 ??
What A@di uploaded is correct... I just checked the IGCSE CHEM syllabus.
-
abbe ek hi R group he.....polymer dikha raha hain bee....toh puri chain dekhani ki zarurat nahi.....
-
What A@di uploaded is correct... I just checked the IGCSE CHEM syllabus.
if u sure abt that..thank you!
dude..relax now,.u'll do good at chem..and listen to bombay rockers - ari ari ari...
if ur real name is ari u'll love the song :D
By the way..if u have more doubts..plz ask..we all r dere.. :D
@nid - arre yaar, maine book bhi check kiya..yeh CO dabba NH kar ke kuch hai hi nahi..it shud be 2 diff. boxes and then chain mein link karo,.,.
-
abbe nahi ur right...yeh nylon 66.barabar....side chains might be different....srry im worked up
-
abbe nahi ur right...yeh nylon 66.barabar....side chains might be different....srry im worked up
chillax man!
and glad u confirmed it i'm right! ;D
-
This is my lastest :D post; if u guys have any practice worksheets or test papers for organic chem plz post them here:
https://studentforums.biz/index.php/topic,4683.msg144616.html#msg144616
-
dude!!
you do these questions within seconds!!
great man!!!
-
dude!!
you do these questions within seconds!!
great man!!!
~thanks
-
too good!!
By the way best luck for ur exams tmr!!!
-
too good!!
By the way best luck for ur exams tmr!!!
~thanks again
-
welcome!!!
and
welcome again!!!