Our school mate Julia (P3C) sends us this SUPER EXPERIMENT.
You can learn about everything in this unit:
A.- States of matter. D.- How to separate mixtures.
B.- Materials. E.- Physical changes.
C.- Mixtures. F.- Chemical changes.
STEPS.-
1.- Salt is solid, in a pot. Water is solid in a glass. (A). Pour 5 spoons of salt in a glass with water, making a mixture (C) with these two materials (B).
2.- Stir water and salt...
Salt doesn't change into 'liquid' state, but you can't see it in the mixture.
3.- Tie a string to a pencil, tie a clip and put it into the water. Put the pencil over the glass with the string pending.
4.- After a few days, salt 'climbs' through the string and you can see it again, as a solid (E).
The water evaporates from the glass (E).
This is a physical method of separating water and salt (D).
5.- The clip rusts (F) into the water.
Thanks a lot Julia!
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