Why do researchers cite the sources of information they use? Reproducibility. 

Reproducibility is a key foundation to making sure the science is valid. If you or others cannot redo the experiment and get the same results then it might be a sign that there is an error along the way. If you cite all the sources used, it is easier to find out where things might have gone wrong.

UofT highlights some reasons to cite: Why Cite?

In chemistry, it is important to cite where your found the properties and data you used in your reaction or calculations. It is also necessary to cite the papers or books used to outline your discussion or conclusions. These all show how you are positioning the results within the larger field of chemistry and validating your data.

More information on citation management and citation guides for chemistry

LaTex is a type-setting system that supports features for technical and scientific documentation. There are two LaTex packages that may be helpful for writing about chemistry: chemfig for drawing chemical structures, and mhchem to type set chemical formulae and equations.