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2-23<br />

Selenium Se8 steel gray 4.825° Selenous acid H2SeO3 hex. 3.004<br />

217 688 i. i. i. CS2; s. H2SO4 15°<br />

4 d. 900° 40090° Silicic acid, meta-<br />

Silicic acid, ortho-<br />

H2SiO3 H4SiO4 amor., 1.41<br />

amor.<br />

2.1–2.3<br />

1.576<br />

i. i.<br />

v. s. al.; i. NH3 s. alk.; i. NH4Cl 17° Silicon, crystalline Si gray, cb., 3.736 2.4<br />

sl. s. sl. s. s. alk.; i. NH4Cl<br />

20° 1420 2600 i. i. s. HNO3 + HF, Ag; sl. s.<br />

Pb, Zn; i. HF<br />

Silicon, graphitic Si cr. 2.0–2.5 2600 i. i. s. HNO3 + HF, fused<br />

alk.; i. HF.<br />

Silicon, amorphous Si brn., amor. 2 2600 i. i. s. HF, KOH<br />

carbide SiC blue-bk., trig., 2.654 3.17 >2700 subl. 2200 i. i. s. fused alk.; i. a.<br />

chloride, tri- Si2Cl6 lf. or lq. 1.580° −1 144760mm chloride, tetra- SiCl4 col., fuming lq.,<br />

1.412<br />

1.50 −70 57.6<br />

d.<br />

d.<br />

d. alk.<br />

d. conc. H2SO4, al.<br />

fluoride SiF4 gas 3.57 (A) −95.7 −651810mm hydride (silane) SiH4 col. gas lq. 0.68<br />

v. s. d. s. HNO3, al., et.<br />

−185° −185 −112760mm oxide, di- (opal)<br />

oxide, di- (cristobalite)<br />

SiO2xH2O SiO2 iridescent, amor.<br />

col., cb. or tet.,<br />

1.487<br />

2.2<br />

2.32<br />

1600–1750<br />

1710<br />

subl. 1750<br />

2230<br />

i.<br />

i.<br />

i.<br />

i.<br />

i.<br />

i. al., et.; d. KOH<br />

s. HF, h. alk., fused CaCl2 s. HF; i. alk.<br />

oxide, di- (lechatelierite)<br />

oxide, di- (quartz)<br />

SiO2 SiO2 hex., 1.5442<br />

2.20<br />

2.650<br />

2230 i. i. s. HF; i. alk.<br />

20° oxide, di- (tridymite)<br />

Silver<br />

SiO2 Ag<br />

trig., rhb., 1.469<br />

silv. met., cb.<br />

2.26<br />

10.5<br />

tr. 315 d., −H2O 50<br />

s.<br />

0° 100100° bisulfite<br />

borate, tetra-<br />

NaHSO3 Na2B4O7 col., mn., 1.526 1.48<br />

2.367<br />

d.<br />

741<br />

sl. s.<br />

1.3<br />

s.<br />

d. al.; i. NH3 i. al., act.<br />

0° 8.7940° borate, tetra Na2B4O75H2O col., rhb., 1.461 1.815 22<br />

i. al.<br />

62° (anh.) 52.3100° (anh.)<br />

borate, tetra- (borax) Na2B4O710H2O* wh., mn., 1.4694 1.73 75 −10H2O, 200 1.30.5 (anh). 20.380° (anh.)<br />

s. gly.; i. abs. al.<br />

bromate NaBrO3 col., cb. 3.33917.5° 381 27.50° 90.9100° bromide NaBr col., cb., 1.6412 3.205<br />

i. al.<br />

17.5° 755 1390 9020° 121100° sl. s. al.<br />

bromide NaBr2H2O col., mn. 2.176 50.7 79.50° (anh.) 118.380° (anh.)<br />

sl. s. al.<br />

carbonate (soda ash) Na2CO3 wh. pd., 1.535 2.533 851 d. 7.10° 48.5104° carbonate Na2CO3H2O wh., rhb., 1.506–<br />

1.509<br />

1.55 −H2O, 100 s. s.<br />

i. al., et.<br />

s. gly.; i. al., et.<br />

carbonate<br />

carbonate (sal soda)<br />

Na2CO37H2O Na2CO310H2O rhb. or trig.<br />

wh., mn., 1.425<br />

1.51<br />

1.46<br />

d. 35.1 s.<br />

21.5<br />

s.<br />

0° 23830° 631.68<br />

128.97<br />

78.10<br />

96.11<br />

28.09<br />

28.09<br />

28.09<br />

40.10<br />

268.89<br />

169.90<br />

104.08<br />

32.12<br />

60.08<br />

60.08<br />

60.08<br />

60.08<br />

107.87<br />

187.77<br />

275.75<br />

143.32<br />

133.89<br />

169.87<br />

22.99<br />

82.03<br />

136.08<br />

81.97<br />

39.01<br />

209.07<br />

511.60<br />

424.07<br />

181.94<br />

312.01<br />

402.09<br />

169.91<br />

144.10<br />

84.01<br />

61.99<br />

120.06<br />

104.06<br />

201.22<br />

291.30<br />

381.37<br />

150.89<br />

102.89<br />

138.92<br />

105.99<br />

124.00<br />

*Usual commercial form.<br />

232.10<br />

286.14<br />

i. al.

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