1 Raised over Fort McHenry on the morning of September 14, 1814, to signal American victory over the British in the Battle of Baltimore; the sight inspired Francis Scott Key to write The Star-Spangled Banner. 2  Preserved by the Armistead family as a memento of the battle.
London dispersion forces are a type of intermolecular force. They are relatively weak. They are also called induce-dipole induce-dipole interactions. 1  Present in non-polar molecules.  Due to non-systematic electron distribution where one molecule induces a dipole on another molecule.
Polar molecules with NâH, FâH, or OâH bonds exhibit dipole-dipole interactions (including hydrogen bonding) and dispersion forces. (a) (b) (c) (d) What kind(s) of intermolecular forces exist in (a) CCl 4 (l), (b) CH 3 COOH(l), (c) CH 3 COCH 3 (l), and (d) H 2 S(l).Worked Example 12.1 (cont.) Ion (a) (b) (c) (d) Solution (a) CCl 4 is nonpolar, so the only intermolecular forces are dispersion forces.ydrogen bonding only occurs in molecules that contain H bonded to a small, highly electronegative atom such as N, O, or F. Hydrogen Bonding F H F. 1/7/2013 2 Hydrogen Bonding Dispersion forces or London dispersion forces result from the Coulombic attractions between instantaneous dipoles of non-polar molecules.