The final intermolecular force is a strong sub-species of dipole forces called the hydrogen bond. No, it's not a chemical bond. It's another physical interaction between polar molecules. But not every polar molecule can pull this off. Let's find out why.

Crash Course on Liquids: youtu.be/HVT3Y3_gHGg
Ted-ED on why ice floats: youtu.be/UukRgqzk-KE
Another take on hydrogen bonding: youtu.be/UahHyX6UAc4

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