What is the percent by mass of NaHCO3 in a solution containing 20 g NaHCO3 dissolved in 600
mL H20?

Smog is the term used to describe the combination of fog and smoke

Gymnast always perform on padded mats. how does the mats protect the gymnast

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.)