518 



PRINCIPLES OF CHEMISTRY 



Uranium tetrachloride, ii. 301 

 Urano-alkali compounds, ii. 298 

 Uranyl, ii. 301 



ammonium carbonate, ii. 300 



nitrate, ii. 300 



phosphate, ii. 300 

 Urea, i. 409 



VALENCY of elements, i. 404, 418, 581 

 Van der Waal's formula, i. 82, 140 

 Vanadic anhydride, ii. 196 

 Vanadium, ii. 194 



oxychloride, ii. 195 



Vapour density, determination of, i. 301 

 Ventilation, i. 244 

 Viscosity, i. 355 

 Volumes, molecular, ii. 4 



gases, i. 300 



WATER, i. 40 



composition of, i. 114, 118, 148, 169, 

 305, 333 



compressibility of, i. 53 



of constitution, i. 109 



of crystallisation, i. 95, 510 



dissociation of, i. 118 



expansion of, i. 53 



Water gas, i. 129, 400, 401 



hard, i. 47 



hygroscopic, i. 56 



mineral, i. 45 



rain, i. 43 



river, i. 43 



sea, i. 46 



specific heat of, i. 52 

 gravity of, i. 50 



spring, i. 44 

 Wave lengths, i. 564 

 Wood, i. 339 



YTTERBIUM, ii. 93- 

 Yttrium, ii. 93 



ZINC, ii. 39 



ammonia-chlorides, ii. '41 



chloride, ii. 40, 41 



compounds, heat of formation of, ii. 

 51 



oxide, ii. 39, 40 



sulphate, ii. '39 

 Zirconium, ii. 146 



chloride, ii. 147 



hydroxide, ii. 147 



oxide, ii. 147 



