A sequence of experiments has been developed that introduce junior-level undergraduate chemistry students to data correlation techniques. We describe these experiments and how they can be implemented in physical chemistry or analytical chemistry laboratory courses. These experiments use sound as a medium for the learning process. Whereas visualization techniques brought computational chemistry into the undergraduate curriculum, we take advantage of the auditory response to small differences in an acoustic signal, to "audibilize" how the data correlation process helps extract useful data from an acquired signal. This method of "listening to complex signals" to extract data is described. Students listen to a mixture of known "standard" sounds and identify its components. This process is compared to more traditional correlation techniques such as Fourier transform and phase locked loop analysis. Students also listen to free induction decays to aid their interpretation of NMR signals. Audibilization complements the students traditional introduction to Fourier transform techniques they use in the laboratory experience.
Supplement
The laboratory instructions for students, examples of waveforms as .wav files, and a MathCad worksheet are available.
Folder JCE2007p1331W containing JCE2007p1331W_1.doc and JCE2007p1331W_2.doc (Microsoft Word), JCE2007p1331W.MCD (MathCad), and two sub-folders of audio files (WAV).
More Information
Citation
Hovick, James W.; Murphy, Michael; Poler, J. C. J. Chem. Educ.2007, 84, 1331.
Experiments, laboratory exercises, lecture demonstrations, and other descriptions of the use of chemicals, apparatus, instruments, computers, and computer interfaces are presented in the Journal of Chemical Education as illustrative of new or improved ideas or concepts in chemistry instruction and are directed at qualified teachers. Although every effort is made to assure and encourage safe practices and safe use of chemicals, the Journal of Chemical Education cannot assume responsibility for uses made of its published materials. Many chemicals are hazardous. Precautions for the safe use of hazardous chemicals and directions for their proper disposal are described in the Material Safety Data Sheets and on the labels. We strongly urge all those planning to use materials from our pages to make choices and to develop procedures for laboratory and classroom safety in accordance with local needs and situations.
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