It ignites in air at 363° and in oxygen at 275-280 (H.
It ignites when heated in air with the formation of the monoxide; dilute acids convert it into metallic lead and lead monoxide, the latter dissolving in the acid.
Heated in contact with air to a temperature of 480° C., acetylene ignites and burns with a flame, the appearance of which varies with the way in which it is brought in contact with the air.
It burns when heated in dry air, and ignites in moist air; it is decomposed by water, giving caustic soda and hydrogen.
A red-hot iron rod may also be used to set off the magnesium, which in turn ignites the thermit.
It oxidizes on heating in air, and ignites in chlorine; on solution in mineral acids it yields ferrous and ammonium salts, hydrogen being liberated.