Silicon cas 7440-21-3 Molecular formula H4Si

Silicon

Silicon;Silicon element;Sicomill Grade 2;KDB 20;Sicomill 4C-P;Silgrain Standard;SILSO;Polysilicon;HGH 600;Metasilicon 325A;Hexsil;CZ-N Polished wafer;SI 1059;GKO 3516A;KR 1;KDB 10;4FY;Silgrain HQ;Si(100) wafer;Biosilicon;Silgrain;Silicon 100;PHC 20;KDB 0.5;KDB 0.1;Aldrich 267414-25G;Sharp 80W;FEB 450D;JT 02;SIE 23PB;Sicomill E 4;PSi-C 2;ψ-C 2;SIE 20PB;KTC;KTC (element);Silicon 600;SI 500443;SI 500444;KEF 100;AgroSilicio;Sili-K;Si-S 10μm;6PW-A1;Silicon 200;SI 500452;a-Si 11;a-Si 12;a-Si 13;M-Si 600;Silgrain E-Si 400;T 2;T 2 (filler);SI 006031;WFP 6005;SAF 184;SI 100;KR-2;Wafer World 119;S 308;17375-03-0;71536-23-7;72516-01-9;72516-02-0;72516-03-1;90337-93-2;152284-21-4;157383-37-4;160371-18-6;1616351-53-1

7440-21-3

Si

InChIKey=XUIMIQQOPSSXEZ-UHFFFAOYSA-N

28.09000

27.98000

231-130-8

5J076063R1|Z4152N8IUI

1508

1346

DTXSID0051441

Black to gray, lustrous, needle-like crystals or octahedral platelets (cubic system); amorphous form is dark brown powder

2804690000

Inorganic Salts

0

0.00000

Silicon powder, amorphous appears as a dark brown powder. Insoluble in water and denser than water. Burns readily when exposed to heat or flames, and may be difficult to extinguish. Water may not be effective in extinguishing flames. Used to make computer microchips.

2.33 g/cm³ @ Temp: 25 °C

1410 °C

2355 °C

H2O: INsoluble

Flammables area

0 mmHg (approx)

Combustible Solid in powder form.

Atomic number: 14; valence: 4, 2; poor conductor of electricity ... lattice constant (25 °C): 5.41987X10-8 cm; compressibility (vol/vol 0) at 25x10+3 kg/sq cm: 0.978; at 100x10+3 kg/sq cm: 0.940; dielectric constant: 13; covalent bond ionization energy at 0 K = 1.2 electron volt; band gap: 1.106 electron volt; impurity atom ionization energy: approx 0.04 electron volt; intrinsic resistivity at 300 K = 0.23 megaohm; average heat capacity (16-100 °C): 0.1774 cal/g/deg C|Temperature of transition: solid = 1683 degree K; liquid = 2750 degree K; Heat of transition: solid = 11.1 kcal/g mole; liquid = 71 kcal/g mole|Mohs hardness: 7; dielectric constant: 12; coordination number: 6|For more Other Experimental Properties (Complete) data for Silicon, Elemental (11 total), please visit the HSDB record page.

Highly flammable. Insoluble in water. A significant dust explosion hazard.

Metals, Elemental and Powder, Active

Highly Flammable

SILICON POWDER, AMORPHOUS is a reducing agent. Ignites in fluorine gas at ordinary temperatures [Mellor 2:11-13 1946-47]. Burns spontaneously in gaseous chlorine. A mixture of silicon, aluminum, and lead oxide explodes when heated [Mellor 7:657 1946-47]. When heated with an alkali carbonate, a vigorous reaction attended by incandescence occurs [Mellor 6:164 1946-47]. Reacts violently with silver fluoride [Mellor 3:389 1946-47]. Reacts with sodium-potassium alloy to form sodium silicide, which is spontaneously flammable in air [Mellor 2 Supp. 2:564 1961].

-9.0550x10+8 J/kmol

Combustible Solid in powder form.

Dust explosion possible if in powder or granular form, mixed with air. If dry, it can be charged electrostatically by swirling, pneumatic transport, pouring, etc.

16 kJ/g

Critical temperature: 4886 °C; critical pressure: 53.6 MPa