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An empty fuel tank can still contain and therefore can be even more dangerous than one full of liquid fuel.

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.)

Using data from seismic waves, geologists have learned that earth’s interior is made up of several