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preface to fifteenth edition

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3.47<br />

Samarium Sm 150.36 7.52 1074 1794 s acids<br />

(II) chloride SmCl 2 221.27 3.687 855 2030 s aq dec; i alc<br />

(III) chloride SmCl 3 256.72 4.46 682 d 93.4 g/100 mL 20 aq<br />

(III) fluoride SmF 3 207.36 6.643 1306 2427 i aq; s H 2 SO 4<br />

(III) oxide Sm 2 O 3 348.72 8.347 2335 s acids<br />

(III) sulfate 8-water Sm 2 (SO 4 ) 3 ·8H 2 O 733.03 2.93 anhyd 450 2.7 g/100 mL 20 aq<br />

Scandium Sc 44.956 2.985 hex 1541 2836 d aq<br />

chloride ScCl 3 151.31 2.39 967 967 v s aq; i alc<br />

oxide Sc 2 O 3 137.91 3.864 2485 s hot or conc acids<br />

sulfate 5-water Sc 2 (SO 4 ) 3 ·5H 2 O 468.17 2.519 anhyd 250 d 550 54.6 g/100 mL 25 aq<br />

Selenium (hexagonal) Se 78.96 4.81 20<br />

4 217 685 s eth, KOH, KCN; i aq, alc<br />

(IV) bromide SeBr 4 398.58 4.029 123 d aq; s HBr, chl, CS 2<br />

(IV) chloride SeCl 4 220.77 2.6 305 subl 196 d aq<br />

(di-) dibromide Se 2 Br 2 317.73 3.604 15<br />

4 225 d d aq; s chl, CS 2<br />

dibromide oxide SeBr 2 O 254.77 3.38 50 41.6 217 d d aq<br />

(di-) dichloride Se 2 Cl 2 228.83 2.774 25<br />

4 85 127 dec d aq; s bz, chl, CS 2<br />

dichloride oxide SeCl 2 O 165.867 2.44 8.5 177.2 d aq; misc bz, chl, CCl 4 ,CS 2<br />

difluoride oxide SeF 2 O 132.96 2.8 15 125 d aq<br />

(IV) fluoride SeF 4 154.95 2.75 10 106 reacts aq viol; misc alc, eth; s chl<br />

(VI) fluoride SeF 6 192.95 8.467 g/L 34.6<br />

(di-) hexasulfide Se 2 S 6 350.32 2.44 121.5 s CS 2 ; 1.2 g/100 mL 20 bz<br />

(IV) oxide SeO 2 110.96 3.95 340 subl 315 w/w %: 38 14 aq, 10 12 MeOH, 4.35<br />

acet, 6.7 14 EtOH, 1.1 12 HOAc; s<br />

H 2 SO 4<br />

(tetra-) tetrasulfide Se 4 S 4 444.10 3.20 113 d i aq; 0.04 g/100 mL 20 bz; s CS 2<br />

Silane SiH 4 32.12 1.409 g/L 185 111.9 d aq slowly; i alc, bz, chl, eth<br />

chloro- SiH 3 Cl 66.56 2.921 g/L 118 30.4<br />

dichloro- SiH 2 Cl 2 101.01 4.432 g/L 122 8.3 d aq<br />

iodo- SiH 3 I 158.01 2.035 57 45.5 d aq<br />

trichloro- SiHCl 3 135.45 1.331 128 33 d aq; s bz, chl<br />

Silicon Si 28.0855 2.33 1412 3265 s HF HNO 3 , fused alkali oxides<br />

carbide (beta) SiC 40.10 3.16 2830 s fused alkali oxides<br />

dioxide ( quartz) SiO 2 60.08 2.648 573 tr<br />

2950 i aq; s HF<br />

quartz<br />

dioxide - tungsten trioxide - SiO 2 · 12WO 3 ·26H 2 O 3310.66 v s aq, alc<br />

water (silicotungstic acid)<br />

disulfide SiS 2 92.22 2.04 1090 s d aq, alc; i bz

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