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Chemistry Help HERE ONLY !!

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zubair_slipknot:
yes its absolutely like this

by the way how is the production of iron in the blast furnace

Bessy:

--- Quote from: gonnagetana on May 26, 2009, 04:21:41 pm ---Hey, does anyone know what colour change occurs when potassium iodide is reduced??? Its in the syllabus, you gotta know this!!!!

--- End quote ---
  umm  there is no color for iodine ion i am sure
 when iodine become atom (that with no overall charge)  its colour is yellow

lana:

--- Quote from: Shogun on May 26, 2009, 06:36:16 pm ---hey lana

it goes like this


3 mols of co2 give 15 cm3
so what will 5 mols of oxygen give?
its simply cross multiplication

no. of mols                 volume
     3                            15
     5                              ?

so (5 x 15)
   ---------= 25cm3
        3

then to get the volume for propanol (C3H8) which is 1 mol ,do the same

no. of mols                   volume
      3                              15
      1                                ?
 
so    (1 x 15)
     ----------  = 5cm3
           3

so the answer is for oxygen=25     and   for  propanol=5

hope u understand, any confusion or difficluties or help, plz do ask me

--- End quote ---



thank you very much you saved my life !!!  =]

Shogun:
ure welcome, dnt forget to +rep me (god i hate sayin this, makes me fell im selfish)

MaNa:

--- Quote from: zubair_slipknot on May 27, 2009, 09:03:22 am ---yes its absolutely like this

by the way how is the production of iron in the blast furnace

--- End quote ---
iron production
Raw material Iron ore coke lime stone
temperature 1900*C
1) C+O2= CO2
2) Co2+C=2CO
the CO2 rises n reacts with more C to orm C0
3) Feo3 +2co= 2fe +3co2
the Co reduced the iorn ore at the top of the furnace to molten iron metal (pig iron) which fallls to the bottom of the furnace n Co2 escapes freom the top as a waste gas
4) limestoen is present to help remove impruties .the main impuritty is sand (silicon oxide) inside the furnace the limestone  decompses tof orm Cao  n co2
CaCo3=CaO +co2
5) the co2 whch is produces reacts with the hot coke yo produce more Co but the lime combines with the sand impurity to form a molten slag alled Calcium siliate
CaO+ SiO2=CaSiO3
the slag bcuz its molten runs to the bottom of the furnace asd its lighter then molten iron thus it floats on the surface n can be tapped off

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