CHEM 2001 : Exam II Key SP 2010
Document Summary
Make sure you know what is being asked. Think about how to answer the question before you start writing. Use complete sentences in all replies unless stated otherwise. Make sure that in numerical problems you present your work in a clear, easy-to-follow fashion. Use the correct number of significant figures in all calculations. (6 pts) 1. State the selection rule for infrared-active bonds in molecules. For a bond in a molecule to be infrared active, it must have a dipole moment that changes upon vibration. {+1 for trying, +1 for saying dipole moment, +4 for saying change in dipole moment upon vibration} (5 pts) 2. Do not make this harder than it is. Ir spectrometry can be quantitative because ir spectrometry follows the beer-lambert law, but one must have a cuvette or sample container that possesses a characteristic fixed pathlength, c, such as a solution cell.
