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39 Cards in this Set

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Kinetic Molecular Theory
Based on the idea that particles of matter are in constant random motion
Ideal gas
hypothetical gas that perfectly fits all the assumptions of the kinetic molecular theory
Elastic collision
no net loss of total kinetic energy
What is the equation for kinetic energy of any moving object?
KE= 1/2mv2
Diffusion
random mixing of particles of 2 substances cause by their random motion
Effusion
process where gas particles pass through a tiny opening
Real gas
does not behave completly according to the assumptions of the KM theory
Fluid
can flow and take the shape of its container
surface tension
force that pulls adjacent parts of a liquids surface tension together and decreases the surface area to the smallest possible size
Capillary Action
attraaction of the surface of a liquid to the surface of a solid
Vaporization
liquid or a solid goes to a goas
Evaporation
part of vaporization- particles escape from a non boiling liquid and go to gas
freezing
physical change of liquid to a solid by removal of heat (energy) aka- solidification
crystaline solids
consist of crystals
crystal
substance where particles are arranged in an orderly, geometric, repeating pattern
Amorphous solod
one in which the particles are arranged randomly
Melting
physical change of solids to liquids by adding heat (energy)
melting point
temp at which the solid become a liquid
supercolled liquids
substances that retain liquid properties even at temps where they appear to be solids
crystal structure
3D arrangment of particles of a crystal
Unit cell
smallest portion of a crystal lattice that shows the 3D patterns
phase
aka-state any part of a system that has uniform composition
Condensation
process where a gas changed to a liquid
Equilibrium
dynamic condition where 2 opposing changes occur at equal rates ina closed system
equilibrium vapor pressure
pressure exerted by a vapor in an equilibrium with its corresponding liquid at a givin temperature (EVP)
volatile liquids
liquids that evaporate readily
boiling
changed of liquid to a vapor inside as well as on the surface
boiling point
liquid is at a temp where EVP equals the atmospheric pressure
Molar enthalpy of vaporization
amount of energy as heat that is needed to vaporize one mole of liquid at the liquids boiling point at constant pressure
Freezing
physical change of a liquid to a solid
Freezing point
temp where the solid and liquid are in equilibrium at 1 atm
molar enthalpy of fusion
amount of energy as heat required to melt one mole of solid at the solids melting point
Sublimation
change of state from a solid directly to a gas
deposition
change of state from a gas right to a solid
phase diagram
graph of pressure verses temperature that shows the conditions under which the phases of a substance exsist
triple point
indicates the temp and pressure conditions at which the solids, liquids, and vapor of the substance con coexsist at the equilibrium
critical point
indicates critical temp critical and
Critical temp
temp above which the substance can not exsist in a liquid state
critical pressure
lowest pressure at which the substance can exsist as a liquid at the critical temp