106 



ELEMENTS AND COMPOUNDS 



for the batteries that ring electric door-bells, etc. (cf. 



152). The same substance is formed in solution, when 



ammonia water and hy- 

 drochloric acid are put 

 together. Here we have 

 an illustration of the 

 uniting of two com- 

 pounds to form a more 

 complex compound. 



FIG. 88. -I -I o QiiltVhiir ^ln 1 



Gaseous ammonia and hydrogen chloride give 11O. OUlpiruT. OU1- 



white fumes of sal ammoniac. After Mellor's ^u,, , "U^-*- ^ " 



Chemistry. Courtesy of the publishers, pnur, Or DrilllStOne, 

 Messrs. Longmans, Green & Co. . , -, T , 



is another element. It 



does not dissolve in water; but it dissolves in carbon di- 

 sulphide (cf. 95). When the solution is allowed to 

 evaporate slowly, crystals of sulphur are obtained (Fig. 

 3). Carbon disulphide must be evaporated away from 

 a fire, as it is very inflammable. 



Sulphur is found chiefly in volcanic regions such as in 

 Sicily, Mexico, and Japan. Louisiana now produces 

 more than any other state, and as much as Sicily. 



Sulphur burns in air or oxygen to give the colorless, 

 suffocating gas, sulphur dioxide (cf. 51). This is used 

 to bleach straw, silk, lace, wool, etc., which would be in- 

 jured by chlorine (cf. 110). It is also used to destroy 

 the germs of disease, and vermin, such as fleas. We make 

 the gas for this purpose by burning sulphur "candles," or 

 by pouring liquid sulphur dioxide (cf. 71) into saucers, 

 and allowing it to evaporate. 



Hydrogen and sulphur form the compound hydrogen sulphide. 

 This is a gas having the disgusting odor of rotten eggs. When eggs 



