The molecules of a substance move apart and becone loosely arranged during __ (contraction/ expansion)​

You may expect bonds between two atoms which each have n covalent lonic metallic hydrogen

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.)

At 450 mm hg a gas has a volume of 760 l, what is its volume at standard pressure