Intermolecular Forces Intermolecular forces are the bonding forces that hold molecules together. They are the main factor determining whether a substance is solid , liquid, or gas at room temperature. Hydrogen bonds are the strongest IMF. Polar bonds or dipole-dipole are the 2nd strongest. All molecules have dispersion forces because of electron motions and these are the weakest IMF.

Isomers Structural isomers are multiple structural models that represent a molecular formula. Stereo-isomers are sturctural isomers that are mirror images of each other.