IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => IGCSE/ GCSE => Sciences => Topic started by: NeoMarmar on June 05, 2010, 06:46:49 pm

Title: Drawing a complex carbohydrate structure
Post by: NeoMarmar on June 05, 2010, 06:46:49 pm: I've come across many questions that ask to 'draw the structural formula of a complex carbohydrate'. You can take a look at May/June 08 paper 3 question 8 for example.

I'm not sure whether to draw a polymer, a carbohydrate, e.Take Care
An explanation would be helpful, thanks.
Title: Re: Drawing a complex carbohydrate structure
Post by: Vin on June 05, 2010, 06:53:51 pm: Ask your doubts here :: https://studentforums.biz/index.php/topic,1411.2655.html

HO-l_l-OH = monosaccharide (Glucose

OH-|_|-O-|_|-OH = disaccharide

-O-l_l-O- = polysaccharide (starch)
Title: Re: Drawing a complex carbohydrate structure
Post by: Vin on June 05, 2010, 07:02:45 pm: One more coming up..
Title: Re: Drawing a complex carbohydrate structure
Post by: Vin on June 05, 2010, 07:13:18 pm: Please ask if anything not understood.. ;)

Sorry for the bad drawing, I am in a hurry.
Title: Re: Drawing a complex carbohydrate structure
Post by: Ivo on June 05, 2010, 07:21:31 pm: Quote from: ~VIN1094~ on June 05, 2010, 07:13:18 pm
Please ask if anything not understood.. ;)

Sorry for the bad drawing, I am in a hurry.

By the way ~VIN1094~, is this an example of condensation polymerisation becomes water molecules are eliminated?
Title: Re: Drawing a complex carbohydrate structure
Post by: Vin on June 05, 2010, 08:01:34 pm: Quote from: Ivo on June 05, 2010, 07:21:31 pm
By the way ~VIN1094~, is this an example of condensation polymerisation becomes water molecules are eliminated?

Yes..
Title: Re: Drawing a complex carbohydrate structure
Post by: NeoMarmar on June 05, 2010, 08:04:23 pm: Hmm... I think I get the gist of it now, thanks =)
Title: Re: Drawing a complex carbohydrate structure
Post by: Vin on June 05, 2010, 08:28:05 pm: Quote from: NeoMarmar on June 05, 2010, 08:04:23 pm
Hmm... I think I get the gist of it now, thanks =)

Glad you got it ;)

By the way you are supposed to know the structures for Nylon and Terylene as well ..um so do you know them? ::)
Title: Re: Drawing a complex carbohydrate structure
Post by: syedz123 on June 06, 2010, 07:38:38 am: Quote from: ~VIN1094~ on June 05, 2010, 08:28:05 pm
Glad you got it ;)

By the way you are supposed to know the structures for Nylon and Terylene as well ..um so do you know them? ::)

hey vin...do we really need to know hw to draw the structures of Nylon and terylene?? wt else r we suppose to know for organic chems...u mynd postin a small summary note of organic chems n important stuff we need to knw
Title: Re: Drawing a complex carbohydrate structure
Post by: Vin on June 06, 2010, 09:38:24 am: Quote from: syedz123 on June 06, 2010, 07:38:38 am
hey vin...do we really need to know hw to draw the structures of Nylon and terylene?? wt else r we suppose to know for organic chems...u mynd postin a small summary note of organic chems n important stuff we need to knw

Yes! Look at the syllabus. All the structures are given..
Title: Re: Drawing a complex carbohydrate structure
Post by: syedz123 on June 06, 2010, 09:58:57 am: Quote from: ~VIN1094~ on June 06, 2010, 09:38:24 am
Yes! Look at the syllabus. All the structures are given..

oh kk...yeah and By the way y is it that the marking schemes for may/june 02 doesnt include question 5?? :-\
Title: Re: Drawing a complex carbohydrate structure
Post by: Vin on June 06, 2010, 10:04:36 am: Quote from: syedz123 on June 06, 2010, 09:58:57 am
oh kk...yeah and By the way y is it that the marking schemes for may/june 02 doesnt include question 5?? :-\

Your answers lie here my friend .. https://studentforums.biz/index.php/topic,8531.msg252059.html#msg252059
Title: Re: Drawing a complex carbohydrate structure
Post by: syedz123 on June 06, 2010, 10:23:30 am: Quote from: ~VIN1094~ on June 06, 2010, 10:04:36 am
Your answers lie here my friend .. https://studentforums.biz/index.php/topic,8531.msg252059.html#msg252059

nice man ;) appreciate the help..Thanks
Title: Re: Drawing a complex carbohydrate structure
Post by: elemis on June 08, 2010, 05:53:59 am: As all IGCSE chemistry exams are over, this topic will be locked.