SciFinder Scholar and PubChem are specific to chemical research, and useful if you are looking for articles or data about specific compounds and reactions. These databases are unique in allowing searching by chemical name or molecular formula.
PubMed is a biomedical, biotechnology and health database. Chemists sometimes use it for bioassay and structural information, including diagrams, 3-D visualization of interactions, and stereochemistry.
Google Scholar is an excellent database, largely overlapping in content with any library database, including SciFinder. For off-campus searches, go through the library web site (under Databases) or through this guide for seamless full-text access.
While some databases will provide full-text access to articles, others provide only citation information. Citations can be used to search the library collection for a print or digital copy, or request articles through a 'RACER' loan.