University College - Chemistry Chem 112A Lecture Notes - Lecture 14: Ideal Gas, Jmol, Isolated System
17 Feb 2017
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Energy cannot be transformed nor destroyed, it can only be transformed/converted from one form to another. Pe for ideal gas 0 (due to elastic collisions) (cid:1842)(cid:1831)+(cid:1837)(cid:1831) of all particles in an area/volume/substance -> system. For an ideal gas: u = (cid:1837)(cid:1831)(cid:3036) (cid:3015)(cid:3036)(cid:2880)(cid:2869) where n is the number of particles: u for an ideal gas = 6. 022 x 10-23 * 3/2kbt = n3/2rt. Extensive property dependent on mass, volume, amount: molar internal energy = 3/2rt -> measured in j/mol. Intensive property independent of the amount of gas. Isolated system matter and energy cannot transfer in or out of the system. Boundaries the area where energy or matter is transferred across (if the system isn"t isolated) Closed system energy can be transferred, but matter cannot. Open system energy and matter can be transferred. Heat amount of energy added to a specified system by a temperature increase. Area with which the system exchanges energy and/or matter.
