The American Chemical Society's most recent style guide is the ACS Guide to Scholarly Communication. The UNT library does not have a subscription to the entire guide, but you can use the free ACS Quick Style Guide to learn how to format references in a bibliography. You will be using the numeric superscript style to do citations in your project (the other ACS styles are numeric parenthetical and author-date).
You will need to confirm what ACS's official abbreviation of journal titles are for RefWorks and other reference managers because they can't always correct the information they get from databases. CASSI is the tool where you can search for a title and find out its official abbreviation. If a journal title is not in CASSI, then use its full title. When using RefWorks, either correct journal abbreviations using the editing panel for a source before writing, or wait until you're done writing a paper to correct the abbreviations in the bibliography.