| NITROUS | Chemical compound, commonly known as laughing gas, with the formula N2O; ... oxide |
| CALCIUMOXIDE | Widely used chemical compound commonly known as quicklime (7,5) |
| POTASH | Alkaline potassium compound commonly used as a fertiliser, originally obtained from the residue of burned wood (6) |
| NITROUSOXIDE | Sweet-smelling gas, N2O (7,5) |
| GAS | N2O, e.g. |
| OXIDE | Nitrous ___ (N2O) |
| OZONE | What is the name of the pungent gas with the formula O3? (5) |
| NITRICOXIDE | A colourless gas with the formula NO that can be generated by lightning (6,5) |
| CARBONMONOXIDE | Colourless odourless poisonous flammable gas with the formula CO |
| 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) |
| NITRIC | ____ oxide, colourless gas with the chemical formula NO (6) |
| STEROL | Chemical compound in some plants with the formula C17H28O (6) |
| MALEICACID | Chemical compound with the formula HOOCCH:CHCOOH, used in making synthetic resins (6,4) |
| LYE | Chemical compound with the formula NaOH |
| OXALICACID | Chemical compound with the formula H2C2O4 |
| ETHANE | Natural-gas compound with the formula C2H6 |
| KRYPTON | Inert gas with the symbol Kr in the periodic table of elements |
| AERATE | Fill it with gas with the ease of a rat (6) |
| METHANOL | Toxic chemical with the formula CH3OH |
