Let’s start with Intra-molecular attractions What are these? – The prefix intra means within, so these attractions are the ones within a molecule, otherwise known as… BONDS We are familiar with two – Ionic (when one atom gives up an electron, the other one takes it, then they are attracted due to opposite charges) – Covalent (when two atoms share two electrons)
This brings us to INTER-molecular attractions What does this term mean? The prefix INTER means between (like interstate highway – a highway that goes between states) IMF’s then are forces that exist between molecules. IMF
How are inter- and intra- molecular attractions related? INTER-molecular attractions depend on the type of INTRA-molecular attraction inside the molecule. Determining both of these will help explain the differences in MP’s and BP’s of different substances.