Molecule Shapes and Intermolecular Forces of Attraction

Linear shape

2 branches, sp, 180 degrees

Ex. BeH2, HCN, & CO2

Trigonal planar shape

Three branches, sp², 120 degrees

Ex. BF2 & H2CO

Tetrahedral Shape

4 branches, sp³, 109.5 degrees

Ex. CH4

Pyramidal Shape

Four branches, sp³, 107 degrees

Ex. NH3

Bent Shape

Four branches, sp³, 104.5

Ex. H2O

Dipole-Dipole attraction

Molecule with positive and negative region due to uneven distribution of electrons, positive and negative ends of different molecules attract

Hydrogen Bond

Hydrogen Bonding is FON, higher melting point and boiling point of compounds

Van Dee Waals/London Dispersion Forces

The force of attraction between NONPOLAR molecules, symmetric charge distribution and diatomics

Molecule - Ion Attraction

Polar molecule attraction to an ion

What is the order of IFA strengths?

Strongest to weakest: Molecule-ion, H-bonding, Dipople-Dipole, Van Der Waals