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Chemistry Help!

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cockyxrocker:
A reaction occured which can be represented by the following equation
Steam + magnesium ---> magnesium oxide + gas v

1.What was the appearance of the magnesium
(i)before the experiment?
(ii)after the experiment?
(iii)Suggest an identity for gas v
(iv)Suggest a test for gas v
(v)Suggest why the tube containing the magnesium ofen cracks on cooling.

I only need help with the last part...dont know how to exactly answer it.
Thanks in advance ^^

twilight:
look the reaction is highly exothermic .. so this heats the test tube a lot and the test tube expands ( solids usually expand on heating)
when u cool it suddenly (like by putting it in cold water or even normal tap water) it contract back suddenly .. so it cracks ..
especially if a part of the tube is cooled before the other

hope this helps  ;)

cockyxrocker:
Thanks  :D

Naruto:
hey
Can anyone tell me which topics should i prepare for my Chemistry paper6 ??? i mean the name of the topics. And should i prepare the whole book for the paper 6 or just few topics will be enough???
Plzzz help me thanks.

sweetsh:
paper 6 chemistry is pretty easy.Pay attention to the laboratory equipments and such things.Ofcourse you know how tomeasure things and draw graphs..In addition to the acid&bases table and the experiments plans which come the last page of the paper.. Solve as much past papers as you can types of questions are always the same..

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