Phase changes such as melting and evaporation can be very “moving” events when molecules are the size of balls! A tub-full of jumbo rubber balls is a perfect demonstration device for comparing the energy and motion of molecules in the solid, liquid, and gas phases. What happens when the tub is shaken, gently at first, and then with more and more energy? Relate what happens to the balls to the changes that take place on a molecular level when a solid melts or a liquid evaporates. The “bouncing ball” demonstration will help students visualize key elements of the kinetic-molecular theory—how close together the molecules are in a solid, liquid, and gas, their relative motion, and the attractive forces between molecules. Isn't it time you made the kinetic-molecular theory truly kinetic? Enough reusable materials are included to perform the demonstration an unlimited number of times.
Concepts: Kinetic-molecular theory, phase changes.
Time Required: 20 minutes
Materials Provided: Clear plastic container with lid and 14 rubber balls, assorted colors.
Bouncing Ball Distillation Kit
When molecules are the size of tennis balls, phase changes such as melting and evaporation can be very “moving” events.
Flinn Catalog/Reference Manual Page 381
Flinn Middle School Catalog/Reference Manual Page 347
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