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Author Topic: CHEM AND BIO HELP AND TIPS HERE  (Read 357193 times)

Offline rameeziiii

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2685 on: June 06, 2010, 08:52:10 am »
Quote from: mdwael on June 06, 2010, 08:49:08 am
I got 2 questions if someone knows atleast one im glad to have the answer. Ok so extracting aluminium, after the aluminium froms and O2 forms up it reacts with the carbon electrodes so they need to be replaced, but what confuses me is why are the electrodes made of carbon in the first place? why not something which wouldnot react with the oxygen? ???
and the second question is not really a question but im confused, what are the carbon chain lengths of the oil fractions seperated by fractional distillation, each one has a different carbon chain length but I got 2 text books and the teachers notes and they all give different carbon chains, so which one should I study for the IGs? ???
because then aluminium might react with it or the oxygen might... or the electrode might melt...i guess
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Offline rameeziiii

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2686 on: June 06, 2010, 08:54:59 am »
Quote from: Ari Ben Canaan on June 06, 2010, 08:51:57 am

You dont need to memorise the carbon chains for the exam - just the names of the fractions and their uses.
what are the fractions....i keep forgetting the names... lemme see... gases,petrol,paraffin,diesel,lubricating oil and bitumen..... this is the correct order right?
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Offline mdwael

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2687 on: June 06, 2010, 08:55:12 am »
Quote from: Ari Ben Canaan on June 06, 2010, 08:51:57 am
@mdwael  The electrodes used have to be unreactive right ? Now remember this is an industrial process, you cant use platinum because its too expensive and many other metals would melt at 900 deg c.

So carbon is cheap and a good conductor.


You dont need to memorise the carbon chains for the exam - just the names of the fractions and their uses.

Thank you Ive been trying to memorize them
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2688 on: June 06, 2010, 08:56:47 am »
Quote from: ahmediiii on June 06, 2010, 08:54:59 am
what are the fractions....i keep forgetting the names... lemme see... gases,petrol,paraffin,diesel,lubricating oil and bitumen..... this is the correct order right?
refinery gas
gasoline (petrol )
naphthaline
paraffin/kerossene
dieself oils
fuel oil
lubrication oils
bitumen
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Offline rameeziiii

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2689 on: June 06, 2010, 09:02:45 am »
all those fractions!!!!!!!!!!!!!
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Offline Helium

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2690 on: June 06, 2010, 09:03:51 am »
Yup check this it's from the syllabus, (what you have to know)
 ;)
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2691 on: June 06, 2010, 09:04:07 am »
Quote from: ahmediiii on June 06, 2010, 09:02:45 am
all those fractions!!!!!!!!!!!!!
and their uses
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Offline rameeziiii

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2692 on: June 06, 2010, 09:06:04 am »
AAAAAAAAAAAAAAAARRRRRRRRGGGGGGGGH!!!!!!!!!1
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Offline NidZ- Hero

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2693 on: June 06, 2010, 09:07:42 am »
do we have 2 learn de no. of carbon atom present in each fraction
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Offline Helium

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2694 on: June 06, 2010, 09:08:26 am »
I think there is a poem or rhyme which makes it easier to memories them

so if anyone knows it.. :D
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Offline Helium

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2695 on: June 06, 2010, 09:09:36 am »
Quote from: Nidzzz on June 06, 2010, 09:07:42 am
do we have 2 learn de no. of carbon atom present in each fraction


I dont think so :-\, never learned that, and never seen it in my book,

confirm anyone
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Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2696 on: June 06, 2010, 09:09:57 am »
Quote from: Nidzzz on June 06, 2010, 09:07:42 am
do we have 2 learn de no. of carbon atom present in each fraction


Nope, just them fractions and their uses.
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Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2697 on: June 06, 2010, 09:16:08 am »
Guys, one doubt, is protein a condensation polymer? ???
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Offline WARRIOR

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2698 on: June 06, 2010, 09:17:51 am »
Quote from: Raywin on June 06, 2010, 09:16:08 am
Guys, one doubt, is protein a condensation polymer? ???

yes!

because water is formed also

remmebr addition polymer jsut form a polymer

condesnation forms a polymebr and a small molecule , which is usually water
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Offline Raywin

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Re: CHEM AND BIO HELP AND TIPS HERE
« Reply #2699 on: June 06, 2010, 09:22:29 am »
Quote from: Kimo Jesus on June 06, 2010, 09:17:51 am
yes!

because water is formed also

remmebr addition polymer jsut form a polymer

condesnation forms a polymebr and a small molecule , which is usually water

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? ???
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