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This is a normal post why does
the undisolved chemical have to stay in the pan?


and presumably the tray that he ours it into has to be chille dint he fridge too otherwise the warmth of the tray would start the reaction and kill us all! i saw that movie with kenau reeves in, you know the one, it has a motorbike and some bird
 (I helped save b3ta! KittyWaste lives at Sleepingplanet.com, Fri 16 May 2008, 15:44, , Reply)
This is a normal post Because...
If you get any crystals in the supercooled solution, they will start off the reaction early.

You can do the same kind of thing with Sodium Thiosulphate ("hypo"), only with that you don't even need to add water - the crystals dissolve in their own water of crystallization when you heat them.
 (I helped save b3ta! Amish Information Systems hates misplaced, commas, Fri 16 May 2008, 15:55, , Reply)
This is a normal post I believe
it's a supersaturated solution. Needs a centre of crystallisation (as mentioned by others)

For some substances you don't even need to touch it - you can just shock the solution into crystallising by tapping the container with a pencil.

Y_S
 (_(_(_(_(_(_(_(_(_ =o.o=, Fri 16 May 2008, 17:48, , Reply)