Qualification > Sciences
CHEMISTRY PAPER 1 HERE
esso:
the answer of 15 in nov 1998 is c....
because to make a reaction go slower.... we have to make the solid bigger...therefore less particles take part in the reaction...leading to less collision and a slower rate of rxn....
option 2 , is to make it less conc. this leads to less solute particles in da acid....therefore slower rate of rxn....
hope i helped...... :)
john12345:
--- Quote from: esso on June 10, 2009, 01:26:02 pm ---the answer is d cause chlorine is produced at the anode ,,, and because it bleaches the indicator the colour becomes white near the anode.....
and at the cathode the alkali is formed which turns indicator blue....
hope i helped,,,,....
--- End quote ---
Hey but what alkali is formed at the cathode
shouldnt hydrogen be formed at the cathode??
john12345:
--- Quote from: esso on June 10, 2009, 01:31:01 pm ---the answer of 15 in nov 1998 is c....
because to make a reaction go slower.... we have to make the solid bigger...therefore less particles take part in the reaction...leading to less collision and a slower rate of rxn....
option 2 , is to make it less conc. this leads to less solute particles in da acid....therefore slower rate of rxn....
hope i helped...... :)
--- End quote ---
ya Thanks a lot for de help. ive + repped u
however for this question de markscheme says A
isnt de markscheme wrong
persian17:
Can anyone upload the papers from below 1999?
cherrip:
hey can anyne help me with this question please..
Its nov 07 ques 31... mark scheme says it should be B, i say its C..
can anyone tell me how?shouldnt it b C as oxygen is whats added to iron?
Thanks in advance ;D
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