How is mechanical energy related to potential and kinetic energy

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.)

Enzymes affect the reactions in living cells by changing the

Is a pencil falling to the floor anon contact force, a force, or a contact force