In this video we’ll identify the intermolecular forces for HI (Hydrogen iodide). Using a flowchart to guide us, we find that HI is a polar molecule. Since HI is a polar molecular without hydrogen bonding present, the main intermolecular force is Dipole-Dipole (also present is London Dispersion Forces).

In determining the intermolecular forces present for HI we follow these steps:

- Determine if there are ions present. Since HI is a molecule and there is no + or – sign after the HI we can say that it is not an ion.

- Next, based on its Lewis Structure, we determine if HI is polar or non-polar. Since there is large difference in electronegativity between the atom H and I atom, and the molecule is asymmetrical, HI is considered to be a polar molecule.

Useful Resources:
Determining Polarity: https://youtu.be/OHFGXfWB_r4
Drawing Lewis Structure: https://youtu.be/1ZlnzyHahvo
Molecular Geometry: https://youtu.be/Moj85zwdULg

More chemistry help at http://www.Breslyn.org