Written by Leigh Agler
Young children have their own ideas about
the "disappearance" of solid into liquid (say, sugar
that's just magic, right? Make it reappear, and
that's BIG magic. But dissolving
isn't really disappearingand that may be the best magic
of all. Young students learn to look beyond the obvious in this
series of highly involving activities on dissolving, evaporation,
Using familiar substances, students create
homemade "Gel-o," colorful disks, and crystals that
emerge on black paper to make a "starry night." Does
the substance disappear? If not, where does it go? Could it
ever come back? As young students ponder these ideas and gain
experience mixing and observing different solutions, they benefit
from this very positive early experience with chemistry.
Two other GEMS guides, Liquid Explorations
and Secret Formulas,
make nice connecting units on early chemistry for this grade
Time: Four 15- to 50-minute sessions.
See the Involving Dissolving online
Comment on this GEMS unit.