Lecture Set 2--Solids and Liquids

Lecture Set 2--Solids and Liquids - Liquid and Solid...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
Liquid and Solid Materials Intermolecular Forces • Ion-Ion (very strong) • Dipole-Dipole (moderate) - hydrogen bonding (strong) • London Forces (“weak”) Solid, Liquid, or Gas London Forces • Induced dipole - dipole •Important for atoms and non-polar molecules *Polarizability: more electrons, bigger molecules
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Dipole - Dipole Forces • Electronegativity-based * Electron-nucleus attraction CO H H Polar molecules allign to yield attraction Hydrogen Bonding • Boiling point usually increases with mol. wt. *NH 3 , H 2 O, and HF are exceptions:
Background image of page 2
• Electrostatic interaction of H with O, N, or F * Size and charge density Ion-Ion Attractions Na + + Cl NaCl Na + "0" valence electrons Cl "8" valence electrons Opposite charges attract!! Comparison of Attractive Molecular Forces Type Examples Typical Δ H vap Ion-Ion NaCl, KBr ~100 kJ/mol Dipole-dipole HBr, SO 2 15-25 kJ/mol Hydrogen Bond H 2 O, NH 3 20-40 kJ/mol London CH 4 , O 2 5-10 kJ/mol
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Liquid Structure and Properties • Molecules constantly in contact * Flows - takes shape of container • Viscosity - resistance to flow * depends on T, P, substance * Stronger intermolec. forces yield higher viscosity • Surface tension - net inward force felt by molecules at a liquid surface Unbalanced forces create surface tension Spheres Minimize Surface Area Latex spheres formed on the space shuttle Beads of water
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 12

Lecture Set 2--Solids and Liquids - Liquid and Solid...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online