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Just for clarification purposes, higher the intermolecular bond strength, higher will be the melting point. This is because you want to break the intermolecular forces within the solid. So higher bond strengths will require more energy to break the bonds, thus will have a higher melting point. There were a lot of questions about this today.
The things that affect intermolecular bonds are the types of bonds i.e. hydrogen and dipole-dipole bonds and the polarizability of the molecule where higher polarizability will mean greater bond strength.
I think in terms of this unit, we just need to know that boiling point and melting point are when a molecule changes its phase. If the intermolecular forces are stronger in one molecule as opposed to another, it will have a higher boiling point and higher melting point relative to the other molecule. Essentially, this means that more energy is required to break the intermolecular forces holding the molecule together, and therefore the temperatures at which these molecules change phases will be greater.
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