1. Chlorine gas
Chlorine gas, chemical formula Cl₂. Under normal temperature and pressure, it is yellow-green, highly toxic gas with strong pungent odor, asphyxiating, denser than air, soluble in water and alkali solution, easily soluble in organic solvents (such as carbon disulfide and carbon tetrachloride), easy to compress, can be liquefied into yellow-green oily liquid chlorine, which is one of the main products of chlor-alkali industry and can be used as a strong oxidizing agent.
2. Ammonia
Ammonia, NH3, colorless gas. There is a strong irritating smell. Density 0.7710. Relative density 0.5971 (air =1.00). Easily liquefied into a colorless liquid. It can be liquefied by pressurizing at room temperature (critical temperature 132.4 ° C, critical pressure 11.2 mpa, or 112.2 atmospheres). Boiling point -33.5℃. It is also easily solidified into a snow-like solid. Melting point -77.75℃. Soluble in water, ethanol and ether.
3. Sulfur Dioxide
Sulfur dioxide (chemical formula SO2) is the most common and simplest sulfur oxide. One of the main pollutants in the atmosphere. The gas is emitted during volcanic eruptions, and sulfur dioxide is also produced in many industrial processes. Because coal and petroleum usually contain sulfur, sulfur dioxide is produced when burned. When sulfur dioxide dissolves in water, it forms sulfite. If sulfite is further oxidized in the presence of PM2.5, sulfuric acid (the main component of acid rain) will be quickly and efficiently generated.
4. Benzene
Benzene (C6H6) A hydrocarbon, the simplest aromatic compound, that is a sweet, flammable, carcinogenic, colorless, transparent liquid at room temperature and has a strong aromatic odor. It is insoluble in water, easily soluble in organic solvents, itself can also be used as an organic solvent.
5. Hydrogen sulfide
Hydrogen sulfide, molecular formula is H2S, molecular weight is 34.076, under standard conditions is a flammable acid gas, colorless, at low concentrations there is rotten egg odor, at very low concentrations there is odor, there is a highly toxic (LC50=444ppm<500ppm). Its aqueous solution is hydrosulfuric acid. The molecular weight is 34.08, the vapor pressure is 2026.5kPa/25.5℃, the flash point is <-50℃, the melting point is -85.5℃, the boiling point is -60.4℃, and the relative density is (air =1) 1.19. Soluble in water, soluble in alcohol, petroleum solvents and crude oil. The ignition point is 292 ° C.
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