CHE 113 Lecture Notes - Lecture 12: Radiant Energy, Mass Spectrometry, Chromatography

• School: Syracuse University
• Department: Chemistry
• Course: CHE 113
• Professor: James Spencer

Document Summary

Atoms are neither created nor destroyed in chemical reactions. Forensic chemical analysis o o o o o o. Questions to consider in choosing an analytical method. Admissibility (are all compositionally the same or are there sufficient variations among known objects to link two samples) All atoms of a given element have the same number of protons and same number of electrons. Atoms of an element may have different numbers of neutrons. Use co2 and h2o to determine the amount of c and h in original sample. Tells how much of each element is present in unknown sample. Allows determination of % of each element in the sample. Creates charged particles (ions) from gas phase molecules. First ionizes a molecular gas which in turn ionized the molecule of interest; a gentler method of ionization. The ms analyzes ions to provide information about the molecular weight of the compound and its chemical structure o.