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.
Intermolecular Forces of Attraction. The only force of attraction that could exist between ethylene and itself is London Dispersion Forces. Ethylene is a nonpolar molecule and thus the only force that it can feel is dispersion forces. All molecules experience this very weak attraction. It is caused by a temporary dipole that forms due to the rapid movement of electrons around atoms. It cannot experience a dipole-dipole attraction because it is nonpolar and there for does not have a positive and negative end. Also, it can not experience hydrogen bonding. This is because hydrogen only occurs between hydrogen and oxygen, nitrogen, or fluorine.