Why does permeable rock weather more quickly than less permeable rock

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.)

Why do cells appear different in distilled water than they do in 10% salt water?

Calculate the number of kilojoules to warm 125 g of iron from 23.5°c to 78.0°c.