The reason I wanted to include a short section on science teaching in a mathematics book is that I often get asked about mathematical notation by science teachers, which is understandable, but I also get asked about chemical symbols, too:
For example, included in the following screenshot is the LaTeX code needed to produce the chemical equation for the Haber Process:
Note that not all LaTeX interpreters can support the more general typesetting notation like the reversible reaction symbol.
I also get asked about representing chemical structures in Moodle courses. A great free tool is Jmol (http://www.jmol.org/). Jmol is an open source Java viewer for chemical structures in 3D. The molecules themselves are described in special files (with the extension .pdb)
that are freely available to download from the Internet. For example, a good source of these special files for simple molecules is http://qsad.bu.edu/data/pdbfiles/, provided by the Quantum Science Across Disciplines (QSAD...