Phase Changes
Fifth grade Chemistry lesson
Liaison: Karine Gibbs
Date: 12/5/97
Group Members: Alexander Mastroianni and Joseph Negron
School: Harrington
Teacher: Jill Abbey
Materials:
solid iodine
glassware (vacuum)
hot plate or access to boiling water
ice water
Procedure:
After completing the unit on magnetism and electricity, we decided to shift our emphasis to
chemistry, beginning with phase changes. We will begin by discussing the properties of
solids, liquids and gases and how some molecules (water for example) can exist in all of
these phases. Then we will delve into the terminology for the phase changes themselves
(evaporation, melting, solidifying, etc.). The experiment we will conduct will concern
probably the most difficult of the phase changes to understand, sublimation and deposition.
Utilizing the iodine/glass system (must be in a vacuum and air tight because iodine gas
is toxic), we will dip the iodine in boiling water and watch the purple gas vapor form.
Soon thereafter, the iodine vapor will be placed in the ice water and deposit back into
solid iodine. We will conclude this presentation with a talk about safety when using
chemicals and conducting experiments.
Evaluation:
We will question the student's prior knowledge of phase changes and see if they can relate
phase changes to events they see in every day life (condensation on window panes,
mothballs, boiling water).
Comments:
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