The chemistry of plant and animal life . given volume of air, asin a cylinder, is chemically united with phosphorus orcarbon, forming soluble products, there is a residue ofnitrogen left in the cylinder. Nitrogen produced in thisway is not pure, but contains traces of other elements andcompounds. For experimental purposes, it may, how-ever, be considered as nitrogen. Nitrogen can also beproduced from its compounds, as by the removal of thehydrogen from ammonia gas. The method of prepara-tion in the laboratory is as follows : Experiment j.—Insert a long pin through the center of alarge flat cor
The chemistry of plant and animal life . given volume of air, asin a cylinder, is chemically united with phosphorus orcarbon, forming soluble products, there is a residue ofnitrogen left in the cylinder. Nitrogen produced in thisway is not pure, but contains traces of other elements andcompounds. For experimental purposes, it may, how-ever, be considered as nitrogen. Nitrogen can also beproduced from its compounds, as by the removal of thehydrogen from ammonia gas. The method of prepara-tion in the laboratory is as follows : Experiment j.—Insert a long pin through the center of alarge flat cork. Fasten a short piece of caudle to the cork bymeans of the pin. Nearly fill the pneumatic trough with the candle and float it upon the surface of the water. In-vert the large cylinder over the candle, having the mouth of the NITROGEN 43 cylinder just below tlie surface of the water as shown in After the candle is extinguished, remove it by thrusting thehand through the water into the cylinder without admittingany. Fig. 20,—Preparation of While still under water, cover the cylinder with a glass plateand remove from the trough. Then make the following tests : (i) Insert a burning splinter into the cylinder of N. Observethe result. (2) Place a little sulfur in the deflagration spoon,ignite, and insert in the cylinder of N. Observe the result.(3) With a ruler, measure the height of the cylinder and theamount of water left in the cylinder. Questions, (i) What is the color of N? (2)Odor? (3) Com-pared with air is it a heavy or light gas? (4) Is it combustible?(5) Does N support combustion ? (6) Is N an active element ?(7) What portion of the cylinder is filled with water in thepreparation of N ? (8) What portion of the cylinder is filledwith N ? (9) What portion of the cylinder did the O occupy ?(10) What becomes of the products of the combustion of thecandle? (11) What do these experiments prove in regard tothe element N ? (12) Complete the fo
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