Library of Congress Classification System: QD, Chemistry
- QD 1-65 - General Works
- QD 11-18 - History
- QD 21-23 - Biography
- QD 24-26 - Alchemy
- QD 27-28 - Early Works
- QD 31-39 - General Books and Textbooks
- QD 39.3.E46 -- Computational chemistry
- QD 40-49 - Study and teaching
- QD 51-65 - Laboratory techniques, apparatus, handbooks, etc.
- QD 71-142 - Analytical chemistry
- QD 81-98 - Qualitative analysis
- QD 95-98 - Spectroscopy and spectrum analysis
- QD 101-142 - Quantitative analysis
- QD 146-197 - Inorganic chemistry
- QD 156 - Inorganic synthesis
- QD 161-169 - Nonmetals
- QD 171-181 - Metals
- QD 189-193 - Salts
- QD 196 - Inorganic polymers
- QD 241-449 - Organic chemistry
- QD 262 - Organic synthesis
- QD 271-272 - Organic analysis
- QD 291 - Nomenclature, named reactions
- QD 300-315 - Aliphatic compounds
- QD 320-327 - Carbohydrates
- QD 330-341 - Aromatics
- QD 380-388 - Polymers
- QD 399-406 - Heterocyclics
- QD 410-412 - Organometallic chemistry
- QD 415-441 - Biological chemistry, natural products
- QD 450-899 - Physical and theoretical chemistry
- QD 461 - Atomic and molecular structure; chemical bonds; molecular dimensions
- QD 462 - Quantum chemistry
- QD 466-467 - Chemical elements, isotopes, periodicity
- QD 469 - Valence
- QD 474 - Complex compounds (coordination compounds, clathrates, etc)
- QD 475 - Physical inorganic chemistry
- QD 476 - Physical organic chemistry
- QD 476.2 - Biophysical chemistry
- QD 477 - Acids and bases
- QD 478 - Solid state chemistry
- QD 501-502 - Chemical reactions, kinetics and mechanisms
- QD 503 - Chemical equilibrium
- QD 504 - Chemical thermodynamics
- QD 505 - Catalysis
- QD 506 - Surface chemistry
- QD 510-539 - Thermochemistry
- QD 540-548 - Theory of solution, solubility
- QD 549 - Colloids, gels
- QD 551-599 - Electrochemistry
- QD 601-655 - Radiochemistry, nuclear chemistry
- QD 701-731 - Photochemistry
- QD 875-882 - Supramolecular chemistry
- QD 901-999 - Crystallography
Other classes in the LC system relevant to chemistry include:
- QA - Mathematics
- QC - Physics
- QC 172-173 - Constitution and properties of matter
- QC 310-319 - Thermodynamics
- QC 450-467 - Spectroscopy
- QC 762-763 - NMR, EPR
- QE - Earth Sciences, including Geochemistry
- QH - Biology (General)
- QP 501-801 - Biochemistry
- QP 517-519 - Biochemical methods, analysis
- QP 551-599 - Proteins, amino acids, hormones
- QP 601-619 - Enzymes
- QP 620-625 - Nucleic acids
- RS - Pharmacy, medicinal chemistry
- T 174.7 - Nanotechnology (general)
- TA 455 - Materials (non-metallic)
- TD 193 - Environmental chemistry
- TP - Chemical Technology
- TP 155-156 - Chemical engineering
- TP 157-159 - Apparatus
- TP 200-248 - Chemicals
- TP 248.13-248.65 - Biotechnology
- TP 315-360 - Fuel
- TP 368-659 - Food processing & manufacture; Fermentation industries, etc.
- TP 670-699 - Oils, fats, waxes
- TP 1101-1185 - Plastics
- TS - Manufactures (including wood, paper, fibers, etc.)
- TX - Food Science, Nutrition
