I went crazy about calling what placement tests I had to take since I have a few community college classes down. Apparently, only engineering majors HAVE to take the chem test. As for you, I'm not completely sure. If chem honors means higher level chem, you probably have to take the test. If chem honors means honors level chem at any class level, I don't think you need to take it.
http://www.testingoffice.uci.edu/
^
Call the number on the top right.