Qualification > Sciences
CHEMISTRY PAPER 1 HERE
sweetsh:
It can be cut by a knife but still not sure
simba:
srry girl anyways thanks
GodOfWar:
--- Quote from: simba on June 11, 2009, 07:50:27 pm ---will someone help me in quetion 4 ,15, and 37 in nov.08
--- End quote ---
Q4 [A] --> well, its kinda hard to explain buh the main reason is becuz X being an ionic salt will dissolve (though all of them wont without heat) but Y wont being organic (like petrol), so u filter it out in 1, and in 2 its the opposite cuz being organic Y HAS TO dissolve in ethanol.
Q15 ---> im not really sure miself, i chose B (its wrong; the rite answer is A) cuz the amount of reactant is decreasing, so they need less energy to form a product.
Q37 [C]--> thats one of the easiest really. Any Carbonate upon reacting with an acid will always produce CO2, so u get bubbles of gas.
VIP_93:
4 the june 2005 ques they want the metal that cant react wid cold water except wen finely powdered
so calcium can react even if its not powdered
and sodium th same thing
copper cant react
Mg reacts with steam and reacts SLOWLY wid water so wen we powder it it will react readily
gd luck ;)
astarmathsandphysics:
cjeck your email in 20 mins
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