17 terms

8th Grade Science: 2-3 Phase Changes

example of vocabulary word list created by students
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physical property
any characteristic of a material that can be observed or measured without changing the composition of the substances in the material
melting point
the point at which a substance changes from solid to liquid
boiling
when a liquid changes to a gas creating bubbles below its surface as well as at the surface
physical change
occurs when some of the properties of a material change, but the substances in the material remain the same
solid
state of matter in which materials have a definite shape and definite volume
liquid
state of matter in which a material has a definite volume but not definite shape
gas
state of matter in which a material has neither a definite shape nor definite volume
pressure
result of force distributed over an area
kinetic energy
energy contained due to its motion
potential energy
energy contained due to position, arrangement or connection with other molecules
kinetic molecular theory
Particles in gas in constant random motion, motion o/ one particle unaffected by motion o/ other particles unless particles collide, forces o/ attraction in a gas can be ignored under ordinary conditions
phase change
reversible physical change that occurs when a substance changes from one state of matter to another.
sublimination
change of state from solid to gas (skips the liquid phase)
deposition
change of state from a gas directly to a solid (skips the liquid phase)
vaporization
the change of a substance from a liquid to a gas.
evaporation
molecules change from liquid to gas at the surface of a liquid
condensation
molecules change from gas to a liquid
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