Qualification > Sciences
chemistry
nid404:
with cold KMNO4 it'll form a diol
CH2OH CH(OH) CH3
with bromide cylcohexene's double bond breaks and Br joins to one of the carbons of the bond.
with hot KMNO4
bond breaks, forming dicarboxylic acid....
tmisterr:
b(ii) is aluminium oxide
b(iii) is sulphur trioxide (it forms sulphuric acid).....it cant be any of the others because the first two are basic, Aluminium oxide is insoluble and Sulphur dioxide form sulphurous acid
c(ii) its an acid base reaction to form a salt and water
SO2 + NaOH ---> NaHSO3 + H2O (Unbalanced)
d i 9O2 and 6SO2 to balance
ii 4x+(6*-2)=0 solve for x, x=+3
iii Work with mole ratios here.
10 moles of Sb2S3 will produce 10/2=5 moles of Sb4O6, carry down the 5 moles to the next equation and five mole of Sb4O6 will produce 5*3= 15 moles of Carbon dioxide. at rtp one mole of a gas occupies 24 dm3 so 15*24 will be 360dm3 of carbon dioxide
ruby92:
--- Quote from: tmisterr on April 07, 2010, 11:27:45 am ---b(ii) is aluminium oxide
b(iii) is sulphur trioxide (it forms sulphuric acid).....it cant be any of the others because the first two are basic, Aluminium oxide is insoluble and Sulphur dioxide form sulphurous acid
c(ii) its an acid base reaction to form a salt and water
SO2 + NaOH ---> NaHSO3 + H2O (Unbalanced)
d i 9O2 and 6SO2 to balance
ii 4x+(6*-2)=0 solve for x, x=+3
iii Work with mole ratios here.
10 moles of Sb2S3 will produce 10/2=5 moles of Sb4O6, carry down the 5 moles to the next equation and five mole of Sb4O6 will produce 5*3= 15 moles of Carbon dioxide. at rtp one mole of a gas occupies 24 dm3 so 15*24 will be 360dm3 of carbon dioxide
--- End quote ---
im sorry i attached the wrong paper its actually october/nov 2003 :D
here's the paper :P
ruby92:
m/j 2004 paper 1
Q23
26
28
35
39 (why only the first one why not the second one; theyre both aldehydes)
nid404:
--- Quote from: ruby92 on April 07, 2010, 08:09:33 pm ---m/j 2004 paper 1
Q23
26
28
35
39 (why only the first one why not the second one; theyre both aldehydes)
--- End quote ---
23) straight D
Cracking of a nonane can nvr give u a hydrocarbon with 10 carbon atoms...
26)straight D again....
slower reaction=high Ea
faster reaction=low Ea
28) D agn
monosubstituted alkene, one R group is attached to the carbon-carbon double bond. Not oxidized by mild oxidising agents
35) B
The temperature of the process causes the decomposition of the calcium carbonate
into calcium oxide.
Hence not 3
39) D straight
When you see a benzene ring, u knw it isn't soluble in water. So, 2 and 3 are out
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