Kuyaka, yodziwika ndi kwambiri zimachitikira mankhwala kutulutsa kuwala ndi kutentha, sikuti nthawi zonse zimatengera kukhalapo kwa okosijeni.
Magnesium imatha kuyaka ngakhale mu mpweya wa carbon dioxide;
Zitsulo monga aluminiyamu ndi mkuwa zimatha kuyaka mu gasi wa sulfure, ndi waya wotenthetsera wamkuwa wotulutsa chinthu chakuda;
Mu mpweya wa chlorine, zinthu ngati haidrojeni, waya wamkuwa, waya wachitsulo, ndipo phosphorous amatha kuyaka, ndi hydrogen kutulutsa lawi lotumbululuka likayaka mu klorini.