You will want to consult online databases and catalogs as well as some print sources to make sure you are getting sufficient reliable and relevant information for your chemistry research. While online databases differ among themselves, they all work basically the same way: you enter a search query and they connect you to relevant articles.
The key to efficient information retrieval from an online database is to select appropriate terms, or keywords, to use in your search query. Most of the time this is straightforward, but occasionally you will have to be resourceful in constructing your query. If you have trouble, be sure to contact a reference librarian!