The situation now is that I don't currently have any shoes that I'd feel good walking around all day long in...not the way we like to walk. I have good running shoes, but I really don't feel like wearing those on a trip to Europe. This is asking way early - but if it takes me a few tries to find the right shoes, I'd rather get that sorted out sooner, rather than later.
Selenite is a variety of the mineral gypsum, which has a chemical formula of calcium sulfate dihydrate.The dihydrate part of that formula indicates that each unit has two molecules of water attached to it.elenite is a variety of the mineral gypsum, which has a chemical formula of calcium sulfate dihydrate.
A selenide is a chemical compound containing a selenium anion with oxidation number of â2, much as sulfur does in a sulfide. The chemistry of the selenides and sulfides is similar. Similar to sulfide, in aqueous solution, the selenide ion, Se2â, is prevalent only in very basic conditions. In neutral conditions, hydrogen selenide ion, HSeâ, is most common. In acid conditions, hydrogen selenide, H2Se, is formed. Some selenides are reactive to oxidation by air. Owing to the greater ...