How is your eardrum similar to a real drum? It vibrates.
It is unpredictable.
It produces sound.
It is hollow.

Both 1,2−dihydronaphthalene and 1,4−dihydronaphthalene may be selectively hydrogenated to 1,2,3,4−tetrahydronaphthalene. one of these isomers has a heat of hydrogenation of 101 kj/mol (24.1 kcal/mol), and the heat of hydrogenation of the other is 113 kj/mol (27.1 kcal/mol). match the heat of hydrogenation with the appropriate dihydronaphthalene.

Si una estrella no tiene paralaje medible, ¿qué puedes inferir?

Hey guys so i need to know what is _nh3+> nh4oh ~chemistry~