University College - Chemistry Chem 112A Lecture 1: Linking Temperature to KE of a gas
20 Jan 2017
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Objective: develop framework to understand one link between bulk (i. e. measurable) and molecular properties. Kinetic theory model not perfect: pure gas composition of molecules or atoms where the distances between them relative to the size of the atom are much larger, molecules in a gas are constantly moving. Moving at different speeds (distribution of speeds: at a given time molecules will move closer and collide with each other. Between collisions there is no force acting on these molecules (move in straight lines) In a container molecules will collide with the walls of the container. Speeds change when molecules collide with each other. Kb = boltzmann"s constant 1. 38 x 10-23. Determine most probable speed for he at 298 k. Mhe = 4 amu * 1. 661 x 10-27 kg/amu must be in kg (si) Sum of probabilities = (cid:1516) (cid:1858)(cid:4666)(cid:1874)(cid:4667)(cid:1856)(cid:1874) (cid:3049)(cid:3118)(cid:3049)(cid:3117) (cid:3495)(cid:2876)(cid:3038)(cid:3277)(cid:3021)(cid:3095)(cid:3040) Qualitatively area underneath the of speeds from v1 to v2.
