Wednesday, June 07, 2006
This is by ms chong:
Yeah u see i wanted to go thru the science "quiz" with u all on our last lesson budden u all didnt want me to go thru it so now i think pple kena confused.. sigh..
yay! sulphur dioxide is O=S=O, so sulphur can have 10 valence electrons. Why:
NB: ** Elements in Period 3 and above (i.e. 3 or more electron shells) can accommodate up to more than 8 valence electrons!
Another thing:
there's a question that requires u to construct a chemical equation.. and u have a salt which is calcium sulphate, Ca2SO4 the tricky part is that this particular salt is insoluble, so the state symbol for calcium sulphate is not (aq) but (s), since it is insoluble and hence will not dissociate in water to form mobile ions. it will just remain in the solution as a solid salt.
((:jialing
A TWO FIVER THREW A TANTRUM AT 6:17 PM.
