Given what’s going on with coronavirus it may be hard to get ahold of people. I would send in what you have with a note that you have been unable to contact the prof for this one class so UC doesn’t think you’re ignoring them. If you can get a syllabus from any Chem 160 I’d also send that in and mention it wasn’t your specific class but it was for another Chem 160 offering.
You might want to also call the Chem dept if they are in; perhaps they keep the syllabi on file. Mention your situation, see if they can do anything to help you. You could try emailing the faculty advisor on https://www.csusm.edu/chemistry/student-resources.html to see if he can help.