chemical reaction,
reaction (chemistry) a process in which one or more substances are changed into others; "there was a chemical reaction of the lime with the ground water"
calcination the conversion of metals into their oxides as a result of heating to a high temperature
combustion,
burning a process in which a substance reacts with oxygen to give heat and light
nitrification the oxidation of ammonium compounds in dead organic material into nitrates and nitrites by soil bacteria (making nitrogen available to plants)
