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vocab
vocab.words
30
Science
11th Grade
02/08/2012

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Term
Amorphous
Definition
a solid in which particles are not arranged in a regular repeating patterns.
Term
atmosphere
Definition
the unit that is often used to report air pressure
Term
barometer
Definition
an instrument that is used to measure atmospheric pressure
Term
boiling point
Definition
the temp. at which a liquid's vapor pressure is equal to the external or atmospheric pressure
Term
Condensation
Definition
the energy releasing process by which a gas or vapor becomes a liquid
Term
Crystalline solid
Definition
a solid whose atoms,ions,or molecules are arranged in an orderly structure
Term
dalton's law of partical pressure
Definition
states that the total pressure of a mixture of gases is equal to the sum of the pressure of all the gases in the mixture
Term
deposition
Definition
the energy releasing process by which a substance changes from a gas or vapor to a solid whithout first becoming a liquid
Term
diffusion
Definition
the movement of one material through another from an area of higher concentration to an area of lower concentration
Term
dipole-dipole forces
Definition
the attractions between oppositely charged regions of polar molecules
Term
dispersion forces
Definition
the weak forces resulting from temp. shifts in the density of electrons in electron clouds
Term
elastic collision
Definition
collision where the kenetic energy may be transferred
Term
evaporation
Definition
vaporization occurs only at the surface of a liquid
Term
freezing point
Definition
the temp. when liquid turns to a soild
Term
grahams law of effusion
Definition
the rate of effusion for gas is inversely proportional to the square root of its molar mass
Term
hydrogen bond
Definition
a strong dipole-dipole attraction between molecules
Term
kinetic-molecular theory
Definition
explains the properties of gases in terms of energy, size, and motion of their particals
Term
melting point
Definition
crystal lattice are broken and become a liquid
Term
pascal
Definition
the SI unit of pressure
Term
phase diagram
Definition
graph of pressure versus temp. that shows which phase a sub. exsits
Term
pressure
Definition
force applied per unit area
Term
sublimation
Definition
the energy requiring process by which a solid changes directly to gas
Term
surface tension
Definition
the energy required to increase  the surface area of a liquid by a given amount
Term
surfactant
Definition
a compound  that lowers the surface tension
Term
temperature
Definition
a measure of the average kinetic energy of particals
Term
triple point
Definition
point on a phase diagram representing the temp, and pressure
Term
unit cell
Definition
the smallest arrangement of connected points
Term
vaporization
Definition
energy requiring process by a liquid changing  to a gas or vapor
Term
vapor pressure
Definition
the pressure exerted by a vapor oer a liquid
Term
viscosity
Definition
a measure of the resistance of a liquid to flow
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