Wikipedia:Reference desk/Archives/Science/2023 November 3

= November 3 =

Alkoins
We know about alkanes; they have single bonds. Alkenes have double bonds and alkynes triple bonds. Is there any reason hydrocarbons with quadruple bonds don't exist?? Georgia guy (talk) 15:27, 3 November 2023 (UTC)


 * Quoting the article on Quadruple bonds: "Quadruple bonds between atoms of main-group elements are unknown." "...a recent paper by S. Shaik et al. has suggested that a quadruple bond exists in diatomic carbon, but this is disputed." Its references should help answer your question. Modocc (talk) 15:52, 3 November 2023 (UTC)


 * Consider the number of bonds the carbon atoms make in a hydrocarbon: four. If there's a quadruple bond somewhere, the carbon atoms on either side of the bond would have used up all their bonds already. That doesn't rule out quadruple bonds with S or P, but you asked about hydrocarbons. PiusImpavidus (talk) 11:51, 4 November 2023 (UTC)

Murchison meteorite
What are those yellow and orange specks on the Murchison meteorite? Can't find in the article (the stated calcium–aluminium-rich inclusions are white instead, it seems). 212.180.235.46 (talk) 20:01, 3 November 2023 (UTC)
 * I think they are chondrules. Ruslik_ Zero 20:35, 3 November 2023 (UTC)