Chem Chapter 12

a collison in which no kinetic energy is lost

a measure of the average kinetic energy of the particles in a sample of matter

used to descripe the movement of one material through another

the molecules of molar mass contribute to effusion (lighter molecules will travel faster)

force per unit area

instrument used to measure atmospheric pressure

one is = to a force of one newton per square meter

is = to 760 mmHg or 760 torr or 101.3 kPa

half the particles half the collisons half the pressure! Dahhhltons law

weak forces that result from temporary shifts in density of electrons in electron clouds

a dipole-dipole attraction that occurs between m containing a H atom bonded to a small, highly electro- atom w/ at least 1 electron pair

measure of the resistance of a liquid to flow

measure of the inward pull by particles in the interior

compounds that lower the surface tension of water (aka active agents)

a solid whose atoms, ions, or molecules are arranged in an orderly, geometric structure

the smallest arrangment of atoms in a crystal lattice that has the same symmetry as the wholecrystal

an element, like carbon, that exists in different forms at the same state-solid liquid or gas-is this

a temp. at which the forces that are holding the molecules tightly together are broked and it becomes a liquid

the process by which a liquid changes to a gas or vapor

occurs only at the surgace of a liquid, as temp rises, more and more molecules enter the gas phase

the pressure exerted by a vapor over a liquid is called...

the temp when the vapor pressure of a liquid = the external or atmospheric pressure

the temp. at which a liquid is converted into a crystalline solid

process when a gas or a vapor becomes a liquid is called

the process when a substance chages from a gas or vapor to a solid without becoming a liquid first

a graph of pressure vs. temp. that shows which phase a substabce exists under different condidtions of teperature and pressure

the point on a phase diagram that represents the temperature and pressure at which three phases of substance can coexist