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### 27 Cards in this Set

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 kinetic energy kenetic = motion the energy an object has because of its motion kinetic theory tiny particles are in constant motion 1. a gas is composed of particles 2. the particles move rapidly in constant motion 3. all collisions are perfectly elastic gas pressure the force exerted by a gas per unit surface area of an object vacuum an empty space with no particles and no pressure atmospheric pressure results from collisions of air molecules with objects *decreases as you climb a mountain because the air layer around the Earth thins out as elevation increases barometers devices commonly used to measure atmospheric pressure dependent on weather pascal (Pa) the SI unit of pressure standard atmosphere (atm) the pressure required to support 760 mm of mercury in a mercury barometer at 25 deg C 1 atm = 760 mm Hg 1 atm = 760 mm = 101.3 kPa vaporization conversion of a liquid to a gas or vapor evaporation the process when vaporization occurs at the surface of a liquid that is not boiling vapor pressure a force due to the gas above the liquid boiling point (bp) the temperature at which the vapor pressure of the liquid is just equal to the external pressure normal melting point the boiling point of a liquid at prssure of 101.3 kPa melting point the temperature at which a solid turns into a liquid crystal the atoms, ions, or molecules that make p te solid substance are arranged in an orderly, repeating, 3D pattern unit cell the smallest group of particles within a crystal that retains the geometric shape of the crystal simple cubic unit cell atoms or ions are arranged at the corners of an imaginary cube body-centered cube unit cell the atoms or ions are at the corners and in the center of an imaginary cube face-centered cube unit cell the atoms or ions are in the center of each face of the imaginary cube (no atom/ion at the center) allotropes two or more different molecular forms of the same element in the same physical state amorphous solids lack an ordered internal structure glasses transparent fusion products of inorganic substances that have cooled to a rigid state without crystallizing phase diagram gives the conditions of temperature and pressure at which a substance exists as solid, liquid, and gas (vapor). triple point describes the only set of conditions at which all three phases can exist in equilibrium with one another sublimation the change of a substance from a solid to a vapor without passing through the liquid state