Qualification > Sciences
CHEMISTRY PAPER 1 HERE
Raed:
--- Quote from: john12345 on June 10, 2009, 02:13:25 pm ---
--- 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??
hydrogen forms at cathod ..see all non matels except for hydrogen forms at anode and all metal icludin hydrogen forms a cathode! if it molten hydrogen is not at anode and in aq and in concetrated hydrogen is formed....
--- End quote ---
GodOfWar:
--- 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. cuz Na is in the 1st group so it WILL react with cold water. Cu is very unreactive so obviously it wont. So u have Mg and Ca.
Ca like u said is more reactive, so it will react more readily while Mg will have to altered alittle to make it react.
kam:
--- Quote from: GodOfWar on June 11, 2009, 08:16:27 pm ---
--- 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. cuz Na is in the 1st group so it WILL react with cold water. Cu is very unreactive so obviously it wont. So u have Mg and Ca.
Ca like u said is more reactive, so it will react more readily while Mg will have to altered alittle to make it react.
--- End quote ---
mg is lower down the reactivity series so its most reactive
sweetsh:
No the highest at the rectivity series is the most reactive
kam:
--- Quote from: sweetsh on June 11, 2009, 08:18:41 pm ---No the highest at the rectivity series is the most reactive
--- End quote ---
yup sorry thts wat i meant
im just so stressed
thx for correcting
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