Qualification > Sciences
CHEMISTRY PAPER 1 HERE
bball92:
--- Quote from: goin4dakill on June 11, 2009, 08:56:40 pm ---Isnt a redox reactions when the reaction has oxidation and reduction at the same time???
The how come S + 2O2--> SO4 is a redox reaction???
--- End quote ---
It isnt... :P
sweetest angel:
--- Quote from: goin4dakill on June 11, 2009, 08:56:40 pm ---Isnt a redox reactions when the reaction has oxidation and reduction at the same time???
The how come S + 2O2--> SO4 is a redox reaction???
--- End quote ---
well i finally understood it
u see the oxidation is easy to get since sulphur gains oxygen atom
now reduction: the oxidation is where the oxygen here becomes from an atom of no oxidation state to losing being of oxidation state of -2 in SO4, thus lose of oxidation state is reduction . that's it ;D!
Hope:
Could anyone please explain why the answer to November 2008 qn 23 is A?
sweetest angel:
--- Quote from: goin4dakill on June 11, 2009, 08:03:47 pm ---OK June 2005.
Which reacts with cold water only when finely powdered?
A. Calcium
B. Copper
C. Sodium
D. Magnesium
I put Sodium because its higher in the reactivity series, but the ms said magnesium...
WHY?? help urgently..?
--- End quote ---
well its in the chapter "PERIODIC TABLE"..where one of the things u gotta learn is that from group II elements magnesium and beryllium react only with steam...and with cold water if powdered, to produce their oxide and liberate hydrogen..while as u knw otha elements of group II react with cold water to form their hydroxide and liberate hydrogen gas
cockyxrocker:
Nov 2008 questions 15,20,29
help!..
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