Are there molecules in molecules?

Your question is very unclear. Photolysis of what?

Yes, water is a bend molecule with a bond angle of about 105 degrees. They are described as bent planar (or V shaped)

A molecule is a combination of two or more atoms. It forms by covalent (electron sharing) bonds that form when the atoms come together in mixture.

conductionConductionConduction.conduction

if you mean the transfer rate of heat ?; the heat transfer rate depends on the atom or molecule type .