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Calcium oxide (formula: Ca O), commonly known as quicklime or burnt lime, is a widely used chemical compound.It is a white, caustic, alkaline, crystalline solid at room temperature.
This is an accepted version of this page This is the latest accepted revision, reviewed on 1 February 2025. This article is about the chemical element. For other uses, see Sulfur (disambiguation). Chemical element with atomic number 16 (S) Sulfur, 16 S Sulfur Alternative name Sulphur (pre-1992 British spelling) Allotropes see Allotropes of sulfur Appearance Lemon yellow sintered microcrystals ...
Calcium sulfide is the chemical compound with the formula Ca S. This white material crystallizes in cubes like rock salt. This white material crystallizes in cubes like rock salt. CaS has been studied as a component in a process that would recycle gypsum , a product of flue-gas desulfurization .
Sulfur (symbol S) is an abundant multivalent nonmetal, one of chalcogens. Under normal conditions, sulfur atoms form cyclic octatomic molecules with chemical formula S 8. Elemental sulfur is a bright yellow crystalline solid when at room temperature. Chemically, sulfur can react as either an oxidant or a reducing agent.
Calcium: Solid Ca 0 Calcium: Gas Ca 178.2 Calcium(II) ion Gas Ca 2+ 1925.90 Calcium(II) ion Aqueous Ca 2+ −542.7 Calcium carbide: Solid CaC 2: −59.8 Calcium carbonate Solid CaCO 3: −1206.9 Calcium chloride: Solid CaCl 2: −795.8 Calcium chloride: Aqueous CaCl 2: −877.3 Calcium phosphate: Solid Ca 3 (PO 4) 2: −4132 Calcium fluoride ...
Strictly speaking, temperature is not part of the definition of a standard state. However, most tables of thermodynamic quantities are compiled at specific temperatures, most commonly room temperature (298.15 K, 25 °C, 77 °F), or, somewhat less commonly, the freezing point of water (273.15 K, 0 °C, 32 °F).
The following chart shows the solubility of various ionic compounds in water at 1 atm pressure and room temperature (approx. 25 °C, 298.15 K). "Soluble" means the ionic compound doesn't precipitate, while "slightly soluble" and "insoluble" mean that a solid will precipitate; "slightly soluble" compounds like calcium sulfate may require heat to precipitate.
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