21. which of the equations is balanced? a) 2li2o + h2o ⇒ 2lioh b) 3fe + 3o2 ⇒ 2fe2o3 c) 2n2 + o2 ⇒ 3n2o d) 3mg + n2 ⇒ mg3n2

Avehicle has an oil leak that is causing the entire oil pan to be wet, but inspection reveals no exact source after cleaning off the oil residue. technician a says to install a fluorescent dye in the crankcase and operate the engine, then re-inspect for leaks with a special light (black light). technician b says the oil leak may be coming from a source at the top of the engine, such as a valve cover gasket. who is correct?

The diagram shows a series of volcanic island and a hot spot determine the direction of movement of the tectonic plate that for the island

The force it would take to accelerate an 900-kg car at the rate of 6m/s2