# States of Matter

xazucicu's version from 2015-05-17 04:46

## Section

Define temperaturethe measure of the average kinetic energy of the particles
purpose of the Kevin Scale?developed to express the mathematical relationship between temperature and kinetic energy
What are gases composed of?composed of tiny particles (atoms, or molecules)
what is pressure?pressure of gases is the result of collisions of particles with container walls
Do gas particles have attraction?gas particles do no have any appreciable attraction for each other
Are collisions between gas particles elastic?Yes, there is no net loss of energy as a result of a collision
What is the relationship between absolute temperature and average Kinetic energy?the average kinetic energy of gas particles is directly proportional to the absolute temp (kelvin) of the gas
(T/F) Gases have a definite shape or volume?false
(T/F) Gases have low densitiestrue
(T/F) Gases are not highly compressiblefalse
(T/F) Gases exert pressure equally in all directions on the walls of their containerstrue
(T/F) Gases mix spontaneously and completely with each other (diffuse readily)true
(T/F) Gases flowTrue
(T/F) Gases contract when heatedFalse, they expand when heated
formula for pressure?force/area
measurement if pressure?Barometer and Manometer
What are some units of pressure measurements?atmosphere(atm), millimeters of Hg (mm Hg), torr, psi, Pascal (Pa)
How many torrs in 1 atm760 torr
What is the volume of a gas?It is the volume of the container it occupies
What are moles(n)the number of gas particles is measured in moles
Boyles Law?The pressure of gas is INVERSELY proportional to its volume. (P1V1 = P2V2)
Charles law?The volume of a gas is DIRECTLY proportional to its temperature.(V1/T1 = V2/T2)
Gay-Lussac's Law?The pressure of a gas is DIRECTLY proportional to its temperature. (P1/T1 = P2/T2)
Combined gas Law?Combines Boyle's, Charles, and Gay-Lussac's laws. ( P1V1/T1 = P2V2/T2)
What is standard Temperature?0ยบC = 273K
what is the standard pressure?1.00 atm = 760 torr = 760mm Hg
What is the molar volume of a gas at STP22.4L/1mole
Ideal gas law formula?PV = nRT
What is the Universal Gas ConstantR = (0.0821 L-atm)/ (K mole) or (62.4 L-Torr)/(K mole)
Dalton's Law or Partial PressuresPtotal = P1 + P2 + . . . ( p = partial pressure)
Describe Vapor pressure?The pressure exerted by a gas in equilibrium with its liquid at a particular temperature.
What is vapor pressure dependent on?it is dependent only on temperature
Define Viscositya liquid's resistance to flow.
What is surface tension?the tendency of a liquid to "bead-up" (tendency toward minimum surface area)
Define evaporationthe changing of a liquid to a vapor at a temperature which is below the boiling point of the liquid
Boiling point is?the temperature at which the vapor pressure is equal to the external (atmospheric) pressure.
why does boiling point vary with external pressure?because the boiling point is the temp at which the vapor pressure = surrounding pressure