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chem vocab
Chapter 13 chem vocab
WORDD. | DEFiNiTiON. |
---|---|
kinetic energy | the energy an object has because of it's motion |
kinetic theory | all matter consists of tiny particles that are in constant motion |
Gas Pressure | results from the force exerted by a gas per unit surface aread of an object |
vacuum | an empty space with no particles and no pressure |
atmospheric pressure | results from the collisions of atoms and molecules in air with objects |
barometer | a device that is used to measure atmospheric pressure |
pascal (Pa) | the SI unit of pressure |
standard atmosphere (atm) | one atm is the pressure required to support 760 mm of mercury in a mercury barometer at 25 degrees C |
vaporization | the conversion of a liquid to a gas or vapor |
Vapor pressure | a measure of the force exerted by a gas above a liquid |
boiling point (bp) | the temperature at which the vapor pressure of a liquid is just equal to the external pressure on the liquid. |
normal boiling point | the boiling point of a liquid at a pressure of 101.3 kPa |
melting point (mp) | the temperature at which a solid changes into a liquid |
crystal | the particles are arranged in an orderly, repeating, three-dimensional pattern called a crystal lattice |
unit cell | the smallest group of particles within a crystal that retains the geometric shape of the crystal |
allotropes | two or more different molegular forms of the same element in the same physical state |