Qualification > Sciences

CHEM AND BIO HELP AND TIPS HERE

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WARRIOR:
yea sure np

good luck 2mrw !

rameeziiii:
good luck....pray for me too.... i'm a disaster... i finished the lost symbol yesterday...lol

mdwael:
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? ???

elemis:

--- Quote from: Kimo Jesus on June 06, 2010, 08:47:21 am ---yea sure np

good luck 2mrw !

--- End quote ---

Thanks. Good Luck to you to ;)

elemis:
@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.

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