![]() The frequencies at which the light is absorbed depend on the types of functional groups present in the sample. This percentage is expressed as the percent transmittance of light over a range of frequencies. These bonds can vibrate by stretching and bending.Īs the light passes through the sample, a spectrometer measures the percentage of light that passes through the other end. The energy from the light then causes covalent bonds within the molecule to vibrate. Infrared spectroscopy, or IR spectroscopy, involves the casting of infrared light through a molecular sample. Part 2: IR spectroscopy a) Experimental procedure With that all out of the way, let’s begin! The MCAT will not require this free recall and production of information-after all, the MCAT is a multiple-choice exam. For example, you may have been asked to draw a molecule that generated a certain spectrum in an undergraduate organic chemistry lab course. Note that while you may have learned about IR and NMR spectroscopy in your undergraduate courses, the level of depth required to do well on these topics for the MCAT is significantly lower. From the fundamental experimental principles to how to interpret the resulting data, by the end of this guide, you'll be equipped for anything the MCAT has in store for you come test day. In this guide, we'll cover everything you need to know about two of the most important forms of spectroscopy: infrared (IR) and nuclear magnetic resonance (NMR) spectroscopy. The answer lies in spectroscopy and other experimental techniques. ![]() ![]() Since molecules are so small, how do chemists determine the structure of an unknown molecule? If researchers cannot observe single molecules with the naked eye, how do we verify the identities of chemical products and reactants? Part 1: Introduction to IR and NMR spectroscopy ![]()
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