What coefficient for Hg demonstrates the law of conservation of mass?
2HgO --> Hg + O2

Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)

How does concentration affect reaction rate

Ajet plane is speeding down the runway during takeoff. air resistance is not negligible. identify the forces on the jet.