Is gasoline a solution colloid or suspension

Neils bohr believed that electrons orbited the nucleus in different energy levels, based on strong support from

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.)

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?