Phase Changes

Melting (endothermic)

changing from a solid to a liquid

Vaporization (endothermic)

changing from a liquid to a gas

Evaporation (endothermic)

when vaporization only occurs at the surfae of the liquid

Sublimation (endothermic)

changing from a solid directly to a gas

Boiling (endothermic)

the conversion of a liquid to a vapor within the liquid as well as at its surface

Boiling point

temperature where equilibrium vapor pressure matches atmospheric pressure

Freezing (exothermic)

changing from a liquid to a solid

Freezing point

the temperature at which a substance changes from a liquid to a solid

Condensation (exothermic)

changing from a gas to a liquid

Deposition (exothermic)

changing from a gas directly to a solid

Heating curves

during a phase change, the temperature stays constant. All of the energy geos to breaking the bonds, not making the molecules move faster