Qualification > Sciences
CHEMISTRY PAPER 1 HERE
mizuki:
thanks for your help everyone.
to answer your Q,sweetest angel,its because if it were in solution,the hydrogen would be liberated in preference to lead.
Clem:
Hey! Can someone tell me why q4 in november 08 is A? Ionic compounds are soluble in ethanol and water
And also november 2007 no. 21, shouldn' it form a blue percepitate??
girl_92:
--- Quote from: sweetest angel on June 11, 2009, 12:21:05 pm ---
--- Quote from: mizuki on June 11, 2009, 12:14:51 pm ---hey guys id appreciate some help.may june 03 q21
water is added to dilute H2SO4 of pH4.What is the resulting pH?
the answer is 6,but why?i know it has something to do with the hydroxide or hydrogen ions in water which change its pH....
--- End quote ---
LOW PH+high PH=neutral
high ph+ high ph= alkaline
low ph+ low ph= acidic
in this case a low ph and a neutral would give u weak acidic only
further xplanation of the results of neutralisation i think is nt needed!
NOW I GOT A QUESTION: NOV08 Q13: y is it B not A?????
--- End quote ---
they asked u abt the metal lead's bromide so it has to be molten
girl_92:
--- Quote from: esso on June 11, 2009, 12:23:13 pm ---i need help in this question <
Three reactions used in the manufacture of sulphuric acid are shown.
1 S + O2 ? SO2
2 2SO2 + O2 ? 2SO3
3 SO3 + H2O ? H2SO4
Which of these reactions are redox reactions?
A 1 only
B 3 only
C 1 and 2 only
D 2 and 3 only
--- End quote ---
its 1 n 2 i suppose
sweetest angel:
--- Quote from: mizuki on June 11, 2009, 12:25:44 pm ---thanks for your help everyone.
to answer your Q,sweetest angel,its because if it were in solution,the hydrogen would be liberated in preference to lead.
--- End quote ---
i thought dat 2 but lead is higher in reactivity series than hydrogen!! =s
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