Similarity between dipole-dipole and dispersion forces

London dispersion forces occur between nonpolar molecules and are extremely weak.
Dipole-dipole forces are between polar molecules, and since polar molecules have slight charges, their force is more similar to ions, giving them a moderately strong bond. Hydrogen bonds occur when hydrogen is directly bonded to Flourine, Nitrogen, or Oxygen. Because of the extreme polarity if these molecules (e.g. water), hydrogen bonds are the strongest dipole-dipole bonds.
Ionic crystallization packs ions into a crystal, and those are extrao

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.