Crossword-Solution: NITRIDE 7 letters, 12 clues 🏆 scrabble score: 8

The ammonia arises from the action of the water upon magnesium, aluminium, or possibly calcium nitride in the calcium carbide, which are bodies also produced in the electric furnace or as the carbide is cooling.

When nitrogen gas is in contact with heated calcium carbide, a reaction takes place which results in the formation of calcium nitride, a compound suitable for enriching the soil.

The equation is: Al_{2}O_{3} + 3C + N_{2} --> 2AlN + 3CO aluminum carbon nitrogen aluminum carbon oxide nitride monoxide Then the aluminum nitride is treated with steam under pressure, which produces ammonia and gives back the original aluminum oxide, but in a purer form than the mineral from which was made 2AlN + 3H_{2}O --> 2NH_{3} + Al_{2}O_{3} Aluminum water ammonia aluminum oxide nitride The Serpek process is employed to some extent in France in connection with the aluminum industry.

The nitride of boron, which is obtained by treating boracic acid with carbon in the presence of nitrogen, when acted upon by steam, forms boracic acid again and yields the whole of its nitrogen in the form of ammonia, but the high temperature at which the first reaction takes place, and the volatility of boracic acid in a current of steam, make it impossible to utilize this reaction industrially.

Tessier du Mothay, who proposed to bring a mixture of nitrogen and hydrogen into contact with titanium nitride and thus to form ammonia continuously.