Decomposing definition

It is not very stable, water decomposing it into alcohol and the alkaline carbonate.

It is very unstable, decomposing slowly even at ordinary temperatures.

Once an oil field is emptied, there is no more oil that will 'grow' there as it's the decomposing mass from the past.

In the formation of gaseous hydrobromic acid from liquid bromine and gaseous hydrogen H2+Br2=HBr+HBr, in addition to the energy expended in decomposing the hydrogen and bromine molecules, energy is also expended in converting the liquid bromine into the gaseous condition, and probably less heat is developed by the combination of bromine and hydrogen than by the combination of chlorine and hydrogen, so that the amount of heat finally developed is much less than is developed in the formation of hydrochloric acid.

Of metals not decomposing liquid pure water, only a few dissolve in aqueous caustic potash or soda, with evolution of hydrogen.