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### 22 Cards in this Set

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 Kinetic Energy the energy an object has because of its motion Kinetic theory a theory explaining the states of matter based on the concept that the particles in all forms of matter are in constant motion Gas Pressure the force exerted by a gas per unit surface area of an object' due to collisions of gas particles with the object vacuum a space where no particles of matter exist Atmospheric pressure the pressure exerted by air molecules in the atmosphere surrounding Earth, resulting from collisions of air molecules with objects Barometers an instrument used to measure atmospheric pressure Pascal(Pa) the SI unit of pressure Standard Atmosphere(atm) a unit of pressure; it is the pressure requited to support 700mm of mercury in a mercury barometer at 25 degrees C; this is the average atmospheric pressure at sea level Vaporization the conversion of a liquid to a gas or vapor Evaporation vaporization that occurs at the surface of a liquid that is not boiling Vapor Pressure the pressure produced when vapor particles above a liquid in a sealed container collide with the container walls; a dynamic equillibrium exists between the vapor and the liquid Boiling Point 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 opint of a liquid at a pressure of 1 atmosphere Melting point the temperature at which a substance changes from a solid to a liquid; the melting point of water is 0 degrees C. Crystal a substance in which the atoms, ions, or molecules are arranged in an orderly, repeating, 3-dimensional pattern Unit Cell the smallest group of particles within a crystal that retains the geometric shape of the crystal Allotropes one or two more different molecular forms of an element in the same physical state; oxygen (O2)and ozone (O3) Amorphous Solids a term used to describe a solid that lacks an ordered internal structure; denotes a random arrangement of atoms Glasses the optically transparent fusion product of inorganic materials that have cooled to a rigid state without crystalizing Phase Diagram a diagram showing the conditions at which a substance exists as a solid, liquid, or gas Triple Point The point on a phase diagram that represents the only set of conditions at which all three phases exist in equilibrium with one another Sublimation the conversion of a solid to a gas or vapor without passing through the liquid state