| ISOMER | Compound with the same formula but structured differently |
| ISOMERISM | Property of having the same formula but a different arrangement of atoms |
| ISOMERIC | (Of compounds) having the same formula with different structure |
| ISOMERS | Molecules with the same chemical formula but different structures |
| METHANE | Compound with the chemical formula CH4 (7) |
| LYE | Chemical compound with the formula NaOH |
| OXALICACID | Chemical compound with the formula H2C2O4 |
| ETHANE | Natural-gas compound with the formula C2H6 |
| SILICA | White colourless chemical compound with the chemical formula SiO2 (6) |
| HYDROGENCYANIDE | Organic compound with the formula HCN, also known as prussic acid (8,7) |
| HYDROGENPEROXIDE | Chemical compound, with the formula H2O2, used as an oxidiser, bleaching agent and antiseptic (8,8) |
| MALEICACID | Chemical compound with the formula HOOCCH:CHCOOH, used in making synthetic resins (6,4) |
| ETHER | An organic compound with the group -O- in its molecules |
| ANTS | With an estimated 20,000 species, insects with structured social systems formed of castes including queens, drones, soldiers and workers (4) |
| ANATOMICALLY | As the body is structured, a nuclear link could be needed (12) |
| DATABASE | Computer file with structured information |
| ESSEX | The Only Way Is - - -, structured reality tv show (5) |
| DEPARTMENTALLY | Go with crew to record how ministries are structured |
| SOCIETAL | Solace, it could be to do with structured community of people (8) |
| HELIX | The DNA molecule is structured as a double what? (5) |
