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3D model (JSmol)
|Molar mass||g·mol−1 30.035|
|Density||1.90 g cm−3 (at 15 °C)|
|Melting point||2,100 °C (3,810 °F; 2,370 K) (decomposes)|
|US health exposure limits (NIOSH):|
|TWA 0.002 mg/m3|
C 0.005 mg/m3 (30 minutes), with a maximum peak of 0.025 mg/m3 (as Be)
|Ca C 0.0005 mg/m3 (as Be)|
IDLH (Immediate danger)
|Ca [4 mg/m3 (as Be)]|
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
|what is ?)(|
Beryllium carbide is prepared by heating the elements beryllium and carbon at elevated temperatures (above 900°C). It also may be prepared by reduction of beryllium oxide with carbon at a temperature above 1,500°C:
- 2BeO + 3C → Be2C + 2CO
Beryllium carbide decomposes very slowly in water:
- Be2C + 2H2O → 2BeO + CH4
The rate of decomposition is faster in mineral acids with evolution of methane.
- Be2C + 4 H+ → 2 Be2+ + CH4
However, in hot concentrated alkali the reaction is very rapid, forming alkali metal beryllates and methane:
- Be2C + 4OH− → 2 BeO22− + CH4
- "NIOSH Pocket Guide to Chemical Hazards #0054". National Institute for Occupational Safety and Health (NIOSH).
- Beryllium Carbide Info American Elements Retrieved June 11, 2009.