Chemistry consists of many different subject areas. If you want to browse either the reference (main floor) or regular (upstairs) collections to find material, I would suggest that you look in the following sections:
QD 1-65 - General Chemistry
QD 71-142 - Analytical Chemistry
QD 146-197 - Inorganic Chemistry
QD 241-414 - Organic Chemistry
QD 414-436 - Biochemistry
QD 450-801 - Physical and Theoretical Chemistry
QD 901-999 - Crystallography