Molecular Forces

Intermolecular forces

Forces of attraction between MOLECULES of a compound or large molecule.

London Dispersion Forces (LDF)

Weak forces that result from temporary shifts in density of electrons in electron clouds. Temporary dipoles are formed.

Order strongest to weakest IMF's?

Hydrogen Bonding, Dipole-Dipole Attraction, London Dispersion Forces

Dipole- Dipole Forces

Attractions between oppositely charged regions of polar molecules

Hydrogen Bonding

Occurs between molecules containing a hydrogen atom covalently bonded to a small, highly electronegative atom (N, O, F)

Type of IMF between C2H2 molecules?

LDF's

Type of IMF between CH3Cl molecules?

Dipole-dipole

Type of IMF between H2O2 molecules?

hydrogen bonding

Why is hydrogen bonding stronger than other IMF's?

Between the bonds there is a strong electronegativity difference and the hydrogen atom is so small it experiences great force of attraction.

Intramolecular Forces

bonding forces that hold the ATOMS of a molecule together

An Example is a covalent bonds

Intramolecular Forces

Examples are London-Dispersion, dipole-dipole and hydrogen bonds

Intermolecular Forces

Viscosity

a liquid's resistance to flow

Surface Tension

the force that acts on the surface of a liquid and that tends to minimize the area of the surface