Qualification > Sciences
CHEM AND BIO HELP AND TIPS HERE
rameeziiii:
--- 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? ???
--- End quote ---
because then aluminium might react with it or the oxygen might... or the electrode might melt...i guess
rameeziiii:
--- 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.
--- End quote ---
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?
mdwael:
--- 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.
--- End quote ---
Thank you Ive been trying to memorize them
WARRIOR:
--- 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?
--- End quote ---
refinery gas
gasoline (petrol )
naphthaline
paraffin/kerossene
dieself oils
fuel oil
lubrication oils
bitumen
rameeziiii:
all those fractions!!!!!!!!!!!!!
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version