GRADES NINE THROUGH TWELVE—CHEMISTRY
Gases and Their Properties
4. The kinetic molecular theory describes the motion of atoms and molecules and
explains the properties of gases. As a basis for understanding this concept:
a. Students know the random motion of molecules and their collisions with a surface
create the observable pressure on that surface.
Prior knowledge & experience:
Students might describe how particle movement changes by an increase in temperature. The effect of temperature on the phases of matter.
What will happen to the water inside the test tube when the test tube is inverted and placed in the beaker?
The heated molecules inside the test tube will cool once the test tube is removed from the fire, which means the molecules will slow down, condense. Thus, the water inside the beaker will rise into the test tube because the air pressure will increase outside the test tube due to the slowing of the water molecules inside the test tube.
The water inside the test tube will leak into the beaker.
Photographs and Movies
Liem, L., Tik. (1987). Invitations to Science Inquiry. Chino Hills, CA: Science Inquiry