From Wikipedia, the free encyclopedia.
General
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|---|---|
| Name | Silicon dioxide |
| Chemical formula | SiO2 |
| Appearance | Transparent solid |
Physical
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| Formula weight | 60.1 amu |
| Melting point | 1986 K (1713 °C) |
| Boiling point | 2503 K (2230 °C) |
| Density | 2.6 ×103 kg/m3 |
| Crystal structure | Quartz, cristobalite or tridymite |
| Solubility | 0.012 g in 100g water |
Thermochemistry
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| ΔfH0gas | -305.43 kJ/mol |
| ΔfH0liquid | -899.86 kJ/mol |
| ΔfH0solid | -910.86 kJ/mol |
| S0gas, 1 bar | 228.98 J/mol·K |
| S0liquid, 1 bar | ? J/mol·K |
| S0solid | 41.46 J/mol·K |
Safety
| |
| Ingestion | Low hazard. |
| Inhalation | Irritation, long term exposure causes silicosis. |
| Skin | May cause irritation. |
| Eyes | May cause irritation. |
| More info | Hazardous Chemical Database |
| SI units were used where possible. Unless otherwise stated, standard conditions were used. | |
It is found in nature in several forms, including quartz and opal.
It is also manufactured in several forms including glass (in colorless high purity form called fused silica) and silica gel. It is a major ingredient of Portland cement. Also, Horsetail is one of the plant which is rich in Silica.
Inhaling silica dust can lead to silicosis.
