Qualification > Sciences

CHEMISTRY PAPER 1 HERE

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goin4dakill:
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..?

sweetsh:
I think because Mg can be powdered ?

simba:

--- Quote from: VIP_93 on June 11, 2009, 07:59:20 pm ---4 _ A ,cuz X is ionic so is solube in water and is the filterate while Y is organic so solube in organic solvents and is in the filterate too

15 _ A , cuz when 5g of X REACT WID 1000 cm , 500cm only react while the excess 500 are used to warm the mixture so when 500cm of water only react wid 5g then then all the 500cm react and there is no excess to warm the mixture and raise the temperature so the the decrease will be double

37 _ C cuz an acid will react with the carbonate to give bubbles of CO2
hope this helps
good luck ;) ;)

--- End quote ---

Thanks man

goin4dakill:

--- Quote from: sweetsh on June 11, 2009, 08:04:42 pm ---I think because Mg can be powdered ?

--- End quote ---

Cant sodium be powdered????

VIP_93:
am not a man... am a girl ;) :D

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