CHEM 1B Chapter 12: Chapter 12 Liquids, Solids, and Intermolecular Forces
Document Summary
Ethanol vs dimethyl ether - same chemical formula, but different properties. Structure of molecule determines strength of its intermolecular forces. State of sample of matter depends on the magnitude of imf b/w constituent particles relative to the amount of thermal energy in sample. Thermal energy high relative to imf gaseous. Thermal energy low relative to imf liquid/solid. 12. 2 solids, liquids, and gases: a molecular comparison. Liquids take on shape of containers; not easily compressed. Definite shape of solids due to relative immobility of atoms/molecules. May be crystalline - the atoms/molecules that compose them are arranged in a well-ordered 3-d array. Or may be amorphous - atoms/molecules that compose them have no long- range order. Able to transform state of matter by changing temperature, pressure, or both. 12. 3 intermolecular forces: the forces that hold condensed states together. Strong imf high melting & boiling points. Weak imf low melting & boiling points.
