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CHEMISTRY PAPER 1 HERE

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girl_92:

--- Quote from: john12345 on June 10, 2009, 04:46:40 pm ---nd one more question

which process can convert molecules to a new substance by removing hydrogen atoms
A displacement
B fermentation
C neutralisation
D oxidation

how do you solve this question

--- End quote ---
john it is oxidation By the way it is not der 4r us it cums in O-levels loss of hydrogen is oxidation

cockyxrocker:
OK so I have a few questions

1)hydrogen can form both ionic and covalent compounds
with which element will hydorgen form an ionic compound?
a-carbon
b-chlorine
c-nitrogen
d-sodium

2)CuSO4 (aq) is electrolysed using Cu electrodes
what observations will be made?

           at anode               at cathode               electrolyte
a-        anode dissolves      pink solid forms        blue color fades
b-        anode dissolves      pink solid forms        no change
c-      colourless gas forms  colourless gas forms  no change
d-     colourless gas forms  pink solid forms         blue color fades

3)  The carbonate of metal x is a white solid
it decomposes  when heated to form co2 gas and a yellow solid oxide
what is metal x

a-copper
b-iron
c-lead
d-sodium

Can somebody please answer them with explaination
Thanks

sweetest angel:
1) SODIUM SINCE ITS DA ONLY METAL
2) "D" SINCE hydroxide is colourless gas...copper pink solid!!
3)can u post the paper...i remeba doin' it buh cnt give xact explanation unless sure of answer!

girl_92:

--- Quote from: cockyxrocker on June 11, 2009, 10:16:23 am ---OK so I have a few questions

1)hydrogen can form both ionic and covalent compounds
with which element will hydorgen form an ionic compound?
a-carbon
b-chlorine
c-nitrogen
d-sodium

2)CuSO4 (aq) is electrolysed using Cu electrodes
what observations will be made?

           at anode               at cathode               electrolyte
a-        anode dissolves      pink solid forms        blue color fades
b-        anode dissolves      pink solid forms        no change
c-      colourless gas forms  colourless gas forms  no change
d-     colourless gas forms  pink solid forms         blue color fades

3)  The carbonate of metal x is a white solid
it decomposes  when heated to form co2 gas and a yellow solid oxide
what is metal x

a-copper
b-iron
c-lead
d-sodium

Can somebody please answer them with explaination
Thanks

--- End quote ---
its 1 d, 2B n 3a

MR.BooMBastiC:
1=d
2=b
3=i doubt da q
yellow oxide???

r u sure that its in question
yellow!!!

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