CM-UY 1004 Lecture Notes - Lecture 18: Intermolecular Force, Surface Tension, Hydrogen Bond
15 Nov 2017
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Document Summary
Hydrogen bonding is a special dipole-dipole interaction, it"s the strongest. Properties of liquids liquid by unit area. How to minimize surface tension: smallest area/unit volume. Sphere > water beads on a surface. Adhesion is an attractive force between unlike molecules. Capillary action: narrow glass tube placed in water and meniscus is pulled up. Viscosity: measure of a fluid"s resistance to flow. Changing structure of molecule also changes viscosity tube. Diamond is a 3d structure of carbon. Graphite is a 2d structure of carbon. Ionic solids have a single cell that is repeated throughout the structure. Amorphous solid: no well-defined arrangement and long-range molecular order. Glass: optically transparent fusion product of inorganic Higher temperature= higher kinetic energy > phase changes. Equilibrium vapor pressure: vapor pressure measured when dynamic equilibrium exists. Increasing temperature= increasing rate at which the phase changes between condensation and evaporation. Appears to not be changing but actually changing rapidly.
