CHEM 103 Lecture Notes - Lecture 8: Metal, Intermolecular Force, Molecular Solid
Document Summary
Liquids, solids & intermolecular forces (chapter 11 in tro textbook) Gas: no definite shape or volume (remember kinetic theory of gases) Forces inside of a molecule are different than forces outside. Intramolecular bonding- bonding that occurs inside bonded compounds. 3 types of intramolecular forces: metallic ii. iii. Intermolecular attractions- interactions between particles (atoms, molecules or ions) Intermolecular forces act on the condensed states of matter (liquids and solids), but less often on gases, because molecules are much closer together in liquids and solids than in gases. Ldf< dipole-dipole< h-bonding < ion-dipole < metallic bonding < ionic bonding < covalent bonding. Common misconception: ****changes in state (melting, vaporization, freezing, etc) are due to changes in intermolecular attractions, not intramolecular bonding. To find the amount of heat energy needed for phase transitions: Q = n h (use for phase changes) Q = m c t (use for temperature changes) Temperature does not change during a phase change.
