Adv. Chem: Chp. 12: Vocab.

Surface tension

a quantitative measure of the elastic force in the surface of a liquid

Capillary action

movement of a liquid up a tube

Cohesion

attraction between like molecules

Adhesion

attraction between unlike molecules

Viscosity

resistance to flow

Boiling point

form of vaporization, dependent of atmospheric pressure

Amorphous

a solid that lacks regular three-dimensional arragement of atoms

Crystalline

a solid that possesses rigid and long-range order

Melting point

the temp at which solid and liquid phases are in equilibrium

Vaporization

the phase change from liquid to gas at the boiling point

Molar heat of the vaporization

the amount of heat required to vaporize a mole of substance at its boiling point

Critical temp.

the temperature at which the gas phase cannot be liquefied, no matter how great the applies pressure

Critical Pressure

the minimum pressure that must be applied to liquefy a substance at its critical temperature

Molar heat of Fusion

then energy, usually expressed in kJ/mol, required to melt 1 mole of a solid

Super cooling

phenomenon in which a liquid can be cooled below its freezing point

Sublimation

solid → gas

Deposition

the phase change from gas to solid

Phase diagrams

summarizes the conditions in temperature and pressure, which a substance exists

Triple point

where all three phases exist at the same time

Lattice Structure

arrangement of the particles in a crystalline solid