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Ch. 13 Chem
Vocab
Term | Definition |
---|---|
kinetic theory | all matter consists of tiny particles that are in constant motion |
vacuum | an empty space with no particles nor pressure |
atmospheric pressure | collisions of atoms and molecules in air with objects |
barometer | device that is used to measure atmospheric pressure |
evaporation | when vaporization occurs at the surface of a liquid that is not boiling |
vapor pressure | measure of the force exerted by a gas above a liquid |
boiling point | temperature at which the vapor pressure of the liquid is just equal to the external pressure on the liquid |
normal boiling point | boiling point of a liquid at a pressure of 101.3 kPa |
melting point | temperature at which a solid turns into a liquid |
crystal | particles are arranged in an orderly repeating, three dimensional pattern called a crystal lattice |
unit cell | smallest group of particles within a crystal that retains the geometric shape of a crystal |
allotropes | 2 or more different molecular forms of the same element in the same physical state |
amorphous solid | lacks an ordered internal structure |
sublimation | change of a substance from a solid to a vapor without passing through the liquid state |