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What type of molecule has dipole-dipole interactions and what type has London dispersion forces?

Answer 1

Only polar molecules will show dipole-dipole interactions, and all will exhibit london-dispersion forces.

If you can figure out if the molecule in question is polar or not (be that by figuring out its molecular geometry or by looking at bond polarity) then you can tell if several of that molecule exhibit dipole-dipole intermolecular forces. All molecules will exhibit london-dispersion forces to a degree, though.

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Answer 2

Ellie Andrews

Molecules with polar bonds, such as those containing highly electronegative atoms like oxygen or nitrogen, exhibit dipole-dipole interactions. Nonpolar molecules, typically composed of atoms with similar electronegativities, experience London dispersion forces.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.