Unit 5 vocab

auogadros law

states that equal volumes of gasses at the same temperature and pressure contain equal numbers of particles

melting point

is the temperature at which a solid turns into liquid

sublimination

the direct change of a substance from a solid to a gas is called

boiling point

the temp at which the vapor pressure of a liquid is just equal to the external pressure is called

unit cell

the smallest group of particles within a crystal that retains the shape of the crystal is called the

barometer

device used to measure atmospheric pressure

vaporization

the evaporation of uncontained liquid is called

amorphous solid

is a form of solid lacking an ordered internal structure

crystalline

a solid in which the atoms, ions, or molecules are arranged in a orderly pattern

vapor pressure

the pressure above a liquid in a sealed container caused by collision of vaporized particles with the walls of container is called

normal boiling point

is the boiling point of a liquid at a pressure of 1 atm

phase change

a change that occurs when the physical state of a substance changes is called a

kinetic energy

states that tiny particles in all forms of matter are in constant motion

super cooled liquid

a substance that has cooled to a rigid state without crystallizing

atmospheric pressure

the pressure resulting from the collision of air molecules with objects is called

evaporation

the conversion of a liquid to a gas below boiling point is called