Every sound is produced by vibrations. How does your voice produce sound?

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.)

What are the two largest greenhouse gases

How many moles of no2 will form when 3.3 moles of cu are reacted with excess hno3?