Silicon dioxide

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Properties

General
Name	Silicon dioxide
Chemical formula	SiO2
Appearance	Transparent solid
Physical
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
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 (http://ull.chemistry.uakron.edu/erd/chemicals/10/9916.html)
SI units were used where possible. Unless otherwise stated, standard conditions were used. Disclaimer and references

The chemical compound silicon dioxide, also known as silica, is the oxide of silicon, chemical formula SiO₂.

It is found in nature in several forms, including quartz and opal. Also, Horsetail is one of the plants which is rich in Silica.

It is manufactured in several forms including glass (in colorless high purity form called fused silica) and silica gel (used e.g. as desiccants in brand new clothes and leather goods). Silica is a major ingredient of Portland cement. The ceramic re-entry heat protection tiles mounted on the bottom side of the Space Shuttles are made mostly of silica.

Inhaling silica dust can lead to silicosis.

Further reading

• R. K. Iler, The Chemistry of Silica.

 ISBN 047102404X.

ca:Sílice de:Siliziumdioxid fr:Silice ja:二酸化ケイ素 nl:Silica pl:Krzemionka

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