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Bond strength
Bond strength refers to the energy required to break a bond.
Dipole moment
A dipole moment describes the separation of electrical charge in a bond or molecule due to differences in electronegativity.
Functional group
A functional group is a specific arrangement of atoms within a molecule that determines the molecule's characteristic chemical reactions.
Wavenumber
The number of wave cycles per centimetre, measured in cm⁻¹. It is inversely proportional to wavelength, so a higher wavenumber means higher frequency and higher energy. IR spectra plot absorption against wavenumber.