Cov hlau no yog xim dawb ci ntsa iab, muaj lub ntsej muag puag ncig, mos, thiab yooj ywm dua li kub, nws yog ib qho khoom siv hluav taws xob zoo heev; nws tsis ua rau dej thiab cov pa oxygen hauv huab cua, thiab nws yuav dub thaum raug rau ozone, hydrogen sulfide thiab sulfur; Nws tsis haum rau feem ntau cov kua qaub thiab nws yaj tau sai hauv cov kua qaub nitric acid thiab cov kua qaub sulfuric kub. Cov kua qaub hydrochloric tuaj yeem ua rau qhov chaw lwj thiab yaj tau hauv cov kua qaub alkali hydroxide, peroxide alkali thiab alkali cyanide hauv huab cua lossis thaum muaj oxygen; Feem ntau cov ntsev nyiaj rhiab rau lub teeb thiab tsis yaj tau hauv ntau cov kua qaub.