CHEM 31X Study Guide - Final Guide: Molecular Mass, Gallium, Mass Spectrometry
20 Aug 2016
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Finals overview: organization, 30% exam i, 30% exam ii, 30% new material c. i. acid base c. ii. Kinetics: 10% lab, spectroscopy, electron impact) a. i. Useful to determine structure of larger molecules a. ii. Detector sees relative abundance of ions with different m/z: electrospray ionization b. i. You can get higher charge values (z: uv-vis c. i. When molecules absorb electromagnetic radiation (light) in uv-visibile range, electrons can be excited between energy levels c. ii. Wavelengths(energies) of light can be absorbed correspond to energy difference between 2 electronic states c. iii. How strong substance absorbs at given wavelength can be found with beer"s law. For linearly confined (conjugated chains) electronic energy levels can be approximated using particle in a box c. iv. 1. Particle in a box formula can be used to relate chain length to wavelength of max absorbance c. iv. 2. Only consider pi electrons (2 pi electrons per double bond: quantum origins (not math, mostly concepts, blackbody radiation a. i. As you increase temperature, wavelength decreased, energy increased a. ii.
