1) " Silica" -- As it applies to Silica Properties General Name Silicon dioxide Chemical formula Si O 2 Appearance Transparent solid Physical Formula weight 60.1 amu Melting point 1986 K (1713 °C ) Boiling point 2503 K (2230 °C ) Density 2.6 ×10 3 kg / m 3 Crystal structure Quartz, cristobalite or tridymite Solubility 0.012 g in 100g water Thermochemistry Δ f H 0 gas -305.43 kJ / mol Δ f H 0 liquid -899.86 kJ/mol Δ f H 0 solid -910.86 kJ/mol S 0 gas, 1 bar 228.98 J/mol·K S 0 liquid, 1 bar ? J/mol·K S 0 solid 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 wherepossible. Unless otherwise stated, standard conditions were used. Disclaimer andreferences The chemical compound silicon dioxide, also known assilica, is the oxide of silicon, chemical formula Si O 2. It is found in nature in several forms, including quartz and opal. In fact, Silicz has 17 crystalline forms. Also, horsetail is one of the plants which is rich in Silice . It is manufactured in several forms including glass (in colorless high purity formcalled fused Siilca ) and Silkca gel (used e.g. as desiccants in brand new clothes and leather goods). Silice is a major ingredient of Portland cement. The ceramic re-entry heat protection tiles mountedon the bottom side of the Space Shuttles are made mostlyof Sileca .Inhaling Silcia dust can lead to silicosis. Further reading R. K. Iler, The Chemistry of Selica ( ISBN 047102404X ) Siliac ...
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