Flashcards in Chapter 12 Deck (27):
A physically distinct and homogeneous part of a system
The attractive and repulsive forces among the particles- molecules, atoms, or ions- in a sample of matter.
A physical change from one phase to another, usually referring to a change in physical state
The process of a gas changing into a liquid
The process of changing from a liquid to a gas
The process of cooling a liquid until it solidifies
The change of a substance from a solid to a liquid
The process by which a solid changes directly into a gas
The process of changing directly from gas to solid
heat of vaporization
The enthalpy change occurring when 1 mol of a liquid substance vaporizes.
heat of fusion
The enthalpy change occurring when 1mol of a solid substance melts
heat of sublimation
The enthalpy changes occurring when of a solid substance changes directly to a gas.
A plot of temperature vs. time for a substance when heat is absorbed or released by the system at a constant rate
The condition at which the forward and reverse relations are taking place at the same rate, so there is no net change in the amounts of reactants or products
The pressure exerted by a vapor at equilibrium with its liquid in a closed system
An equation that expresses the linear relationship between vapor pressure P of a liquid and temperature T.
The temperature at which the vapor pressure of a gas equals the external pressure
The temperature at which the solid and liquid forms of a substance are at equilibrium
A diagram used to describe that stale phases and phase changes of a substance as a function of temperature and pressure
The pressure and temperature at which three phases of a substance are in equilibrium. In a phase diagram, the point at which three phase-transition curves meet.
The point on a phases diagram above which the vapor cannot be condensed to a liquid; the end of the liquid-gas curve
van der Waals radius
One-half of the shortest distance between the nuclei of identical non bonded atoms
The intermolecular attractive force between an ion and a polar molecule.
The intermolecular attraction between oppositely charged poles of nearby polar molecules
A type of dipole-dipole force that arises between molecules that have an H atom bonded to a small, highly electronegative atom with lone pairs, usually N,O, or F.
The ease with which a particle's electron cloud can be distorted