Interactive, scaffolded model
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Class begins with a discussion about the necessity of changing the model to accommodate attractive forces between atoms and why this is needed to model phase changes. Students then use a computer model to visualize phase changes and understand boiling points.
Students will be able to:
Suppose you were a molecule in a liquid in a glass. Someone then takes that glass and puts it in the freezer. After a while the liquid freezes. How does what you see and feel change?
This activity is one of a larger module, Atoms in Motion:
There is an attractive force between all atoms, causing or preventing phase changes and resulting in specific melting and boiling points.
Additional Related Concepts
This model also appears in the States of Matter module.
Even on the nicest day, a hot air balloonist often encounters clouds. Clouds consist of many tiny liquid drops. This activity will help explain how and why liquids form.