CHM110H5 Study Guide - Midterm Guide: Chemical Polarity, Molar Mass, Phenolphthalein
Document Summary
Study notes for chemistry midterm 2 - friday, nov 9th. Molecules are far apart; most of the volume is empty space. Molecules are in constant motion; they travel in straight line paths. Diffusion process by which a gas mixed with another; random movement of gas particles in a medium. Effusion process by which a gas escapes a container through a small opening; gas movement through a hole. Molecular velocities: at constant t, the average kinetic energy and velocity are constant, there is a wide range of values for the kinetic energy and velocity of individual molecules, relative average velocities depend on relative masses. So, the heavier the molecule, the slower it moves. Diffusion and effusion rates are known as r, so: r1 = m2 r2 m1. Mean free path: the average distance a particle travels before it collides with other particles effusion < diffusion < molecular velocities (due to collisions) Van der waal"s equation: (p + n2a/v2)(v-nb) = nrt where,