Qualification > Sciences
CHEMISTRY PAPER 1 HERE
sweetest angel:
--- 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 ---
2 and 3?
i saw this question be4...can u tell me which year please?
girl_92:
--- Quote from: Clem on June 11, 2009, 12:26:30 pm ---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??
--- End quote ---
ionic compounds dissolve in water n covalent dont n covalent dissolve in organic solvents n ionic dont so with either methods dey can be separated the undissolved compound is left as reidue
winnie101:
the ans is actually c, 1and2
mizuki:
hey when you polymerise an an alkene,e.g. ethene,does it become polyethEne or polyethAne?
Triple_A:
--- Quote from: madee on June 11, 2009, 12:33:32 pm ---
--- Quote from: Clem on June 11, 2009, 12:26:30 pm ---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??
--- End quote ---
ionic compounds dissolve in water n covalent dont n covalent dissolve in organic solvents n ionic dont so with either methods dey can be separated the undissolved compound is left as reidue
--- End quote ---
reagent aq BaCl is wrong
@mizuki........polyethene
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