PLEASE HURRY IM TIMED Which type of change cannot be reversed? physical change
chemical change

Which of these expressions are correct variations of the combined gas law? p1v1t2 = p2v2t1 both

In vapor-liquid equilibrium in a binary mixture, both components are generally present in both phases. how many degrees of freedom are there for such a system? the reaction between nitrogen and hydrogen to form ammonia occurs in the gas phase. how many degrees of freedom are there for this system? steam and coal react at high temperatures to form hydrogen, carbon monoxide, carbon dioxide, and methane. the following reactions have been suggested as being involved in the chemical transformation:

What is bromine+calcium iodide--> calcium bromide +iodine balanced