At the end of this activity, students should be able to: û explain how atomic nuclei behave in an external magnetic field, depending upon whether they posses nuclear spin or not û explain why a magnetic field causes the energy levels of nuclei possessing nuclear spin to split û explain the nuclear absorption of electromagnetic radiation by nuclei placed in a magnetic field û describe the construction and operation of an NMR spectrometer and how an NMR spectrum is recorded û explain the term 'chemical shift' and discuss why hydrogen atoms in organic molecules may produce more than one NMR absorption signal û explain why TMS has been chosen as a standard in NMR spectroscopy û identify equivalent and nonûequivalent 1H atoms in the molecule û predict the number of absorption signals in lowûresolution proton NMR spectra, as well as their relative intensity.

Originally released by Learnetic, 2016.