| | 540 | chemistry |  |
| ↑ | 540 | chemistry in general |  → 016.54 660.28 ≈ 59A S.SPEC.36.CB |   |
| ↑ | 540.14 | nomenclature | | |
| ↑ | 540.2 | miscellaneous works in chemistry | | |
| ↑ | 540.7 | education and research in chemistry | | |
| ↑ | 540.76 | exercice and auxiliary books in chemistry | | |
| ↑ | 540.9 | history of chemistry | | |
| ↑ | 540.92 | biographies of chemists | | |
| ↑ | 541 | physical chemistry | → 660.29 ≈ 60A | |
| ↑ | 541.042 | matter state chemistry, solid state | | |
| ↑ | 541.2 | theoretic chemistry | | |
| ↑ | 541.22 | molecular structure | ≈ 60B | |
| ↑ | 541.220 | formulas, specifications | | |
| ↑ | 541.223 | stereochemistry | | |
| ↑ | 541.224 | chemical bonds, valency, radicals | | |
| ↑ | 541.2242 | coordination compounds, blenders | | |
| ↑ | 541.26 | stoichiometry | | |
| ↑ | 541.28 | quantum chemistry | | |
| ↑ | 541.3 | various subects in physical chemistry | | |
| ↑ | 541.33 | surface chemistry, adsorption, adhesion | | |
| ↑ | 541.34 | chemistry of solutions, colloids | | |
| ↑ | 541.345 | colloid chemistry | ≈ 59H | |
| ↑ | 541.348 | solvents | | |
| ↑ | 541.35 | photochemistry | | |
| ↑ | 541.36 | thermochemistry | | |
| ↑ | 541.363 | state changes, phase transformations | | |
| ↑ | 541.368 | reactions at extreme temperatures | | |
| ↑ | 541.369 | chemical thermodynamics | → 536.7 | |
| ↑ | 541.37 | electrochemistry, magnetochemistry | | |
| ↑ | 541.372 | electrolytic solutions | | |
| ↑ | 541.378 | magnetochemistry | | |
| ↑ | 541.38 | radiochemistry | | |
| ↑ | 541.388 | isotopes | | |
| ↑ | 541.39 | chemical reactions | | |
| ↑ | 541.392 | chemical equilibrium | | |
| ↑ | 541.393 | oxydo-reduction | | |
| ↑ | 541.394 | chemical kinetics | | |
| ↑ | 541.395 | catalysis | | |
| ↑ | 542 | laboratory techniques, computational chemistry | → 6 | |
| ↑ | 542.8 | auxiliary and electronic facilities, data processing | | |
| ↑ | 543 | analytical chemistry | ≈ 59B | |
| ↑ | 543.08 | spectroscopy, chromatography [outdated number] | | |
| ↑ | 543.1 | bromatological analysis | ≈ S.SPEC.36.CC | |
| ↑ | 543.17 | organic analytical chemistry | | |
| ↑ | 543.2 | classical methods | ≈ 59D | |
| ↑ | 543.22 | microchemistry | ≈ 59C | |
| ↑ | 543.24 | volumetric analysis | | |
| ↑ | 543.26 | thermal analysis | | |
| ↑ | 543.4 | electrochemical analysis | | |
| ↑ | 543.5 | optical spectroscopy | | |
| ↑ | 543.6 | non-optical spectroscopy | | |
| ↑ | 543.63 | radiochemical analysis | | |
| ↑ | 543.8 | chromatography | | |
| ↑ | 543.84 | liquid-mobile phase chromatography | | |
| ↑ | 543.85 | gas chromatography | | |
| ↑ | 546 | inorganic chemistry | → 551.9 572.51 | |
| ↑ | 546.2 | hydrogen and its compounds | | |
| ↑ | 546.24 | acids | | |
| ↑ | 546.3 | metals, metallic compounds, alloys | → 620.16 669 | |
| ↑ | 546.34 | salts | | |
| ↑ | 546.4 | group 3, lantanids, actinids | | |
| ↑ | 546.41 | lantanids, rare earths | | |
| ↑ | 546.42 | actinids | | |
| ↑ | 546.5 | groups 4 to 7: of titanium, vanadium, chrome, manganese | | |
| ↑ | 546.6 | groups 8 to 14 | | |
| ↑ | 546.625 | nickel | | |
| ↑ | 546.671 | boron | | |
| ↑ | 546.7 | groups 15 to 18: chalcogens, alogens, noble gases | | |
| ↑ | 546.8 | periodic law and table | | |
| ↑ | 547 | organic chemistry | ≈ 59G | |
| ↑ | 547.002 | techniques, devices, equipment | | |
| ↑ | 547.007 | exercices and auxiliary materials in organic chemistry | | |
| ↑ | 547.01 | hydrocarbons | → 547.41 | |
| ↑ | 547.02 | halogenated compounds | | |
| ↑ | 547.04 | nitrogen compounds | | |
| ↑ | 547.05 | organometallic compounds | | |
| ↑ | 547.06 | sulphur organic compounds | | |
| ↑ | 547.1 | physical and theoretical organic chemistry | | |
| ↑ | 547.122 | molecular structures, stereochemistry, bonds | | |
| ↑ | 547.128 | quantum chemistry | | |
| ↑ | 547.135 | photochemistry | | |
| ↑ | 547.137 | electrochemistry, magnetochemistry | | |
| ↑ | 547.2 | organic reactions | | |
| ↑ | 547.23 | oxydoreduction | | |
| ↑ | 547.28 | polymerization | | |
| ↑ | 547.4 | aliphatic compounds | | |
| ↑ | 547.41 | hydrocarbons | → 547.01 | |
| ↑ | 547.413 | acetylenes, alchines | | |
| ↑ | 547.5 | cyclic compounds | | |
| ↑ | 547.59 | heterocycles | | |
| ↑ | 547.593 | heteronitrogen compounds, clorophillae, diazines, imidazolos | | |
| ↑ | 547.6 | aromatic compounds | | |
| ↑ | 547.7 | macromolecules, polymers | → 620.19 668.9 | |
| ↑ | 547.71 | terpenes and essential oils | | |
| ↑ | 547.77 | lipids | | |
| ↑ | 547.78 | carbohydrates | | |
| ↑ | 547.8 | other organic substances | | |
| ↑ | 547.84 | elastomers, resins, lignin | | |
| ↑ | 547.86 | colourants and pigments | | |
| ↑ | 548 | crystallography | ≈ 47A 47C | |
| ↑ | 548.021 | formulas | | |
| ↑ | 548.3 | crystallochemistry | ≈ 48BC 58E | |
| ↑ | 548.5 | crystallization | | |
| ↑ | 548.7 | mathematical crystallography | ≈ 48BD | |
| ↑ | 548.8 | physical and structural crystallography | ≈ 47B 47H | |
| ↑ | 548.81 | structural crystallography | | |
| ↑ | 548.83 | diffractometric methods | | |
| ↑ | 548.9 | optical crystallography | ≈ 47F 48B | |
| ↑ | 549 | mineralogy | → 552 ≈ 25B 44C | |
| ↑ | 549.1 | determinative mineralogy | ≈ 49F 49H | |
| ↑ | 549.6 | silicates | ≈ 45H | |
| ↑ | 549.67 | phyllosilicates, clay minerals | → 553.6 ≈ 32G | |
| ↑ | 549.9 | geography of minerals | ≈ 45B 45C | |
