Official course description: Prerequisites: CHEM 111B with a grade of "C" or better. Corequisites: CHEM 224 is required for students repeating course. CHEM 223A must be taken concurrently if required by a degree plan. First semester of two-semester sequence (CHEM 220A, CHEM 220B; and CHEM 223A and CHEM 223B or CHEM 320L). Sequence meets requirements for medical and dental schools. Emphasis is upon application of modern principles of structure, reactivity, methods of synthesis, physical properties and spectroscopy. Not open to students with credit in CHEM 320A or CHEM 322A.