When the electron from the n=4 excited state drops to the ground state, does it absorb energy or emit energy?

Sulfuric acid (a component of acid rain) reacts with limestone (calcium carbonate) to produce calcium sulfate and carbon dioxide. this damages buildings and statues made of limestone. which solution of sulfuric acid will damage these structures more quickly? a. 0.001% b. 0.005% c. 0.010% d. 0.015%

Chemical kinetics what was the rate of reaction in trial 3? choose the closest answer.

What is the lowest number energy level where a d sublevel is found