Where a metal underground water pipe is used as a grounding electrode, if the grounding electrode conductor is a 3/0 AWG copper, what is the minimum size required for the required bonding jumper around any water meters, filtering equipment, or similar equipment

What is the chemical formula of the following compound

Needthe meter is the standard unit for: 1) height 2) length 3) weight 4) mass

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.)