CHEM 112 Chapter Notes - Chapter 11: Order And Disorder (Physics), Kinetic Theory Of Gases, London Dispersion Force

• School: UMASS-Amherst
• Department: Chemistry
• Course: CHEM 112
• Professor: Prof. Scott M. Auerbach

Document Summary

11. 1 kinetic molecular theory, states of matter, and phase changes. The physical state of a substance is controlled by pressure, temperature, and intermolecular forces (imfs) The strength of the imfs in a substance affects many of its properties. Converting an ordered phase to a less ordered phase requires the addition of energy to overcome the imfs, and energy is released when a less ordered phase is converted to a more ordered phase. The magnitude of a liquids enthalpy of vaporization is directly related to the strength of the imfs in the liquid. Equilibrium vapor pressure for a liquid is the pressure of the vapor over a liquid when a dynamic equilibrium is reached at a given temperature. As temperature increases, the vapor pressure for a liquid increases. As the strength of the imfs in a series of liquids increases, the vapor pressures of the liquid decrease.