The following chemical equation shows the incomplete formula for burning methanol. the question mark represents the unknown number of oxygen (o2) molecules. how many molecules of o2 are needed to balance this chemical equation? *
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Select the atomic models that belong to the same element

What are the three major branches of natural science? • earth and space science, life science, physical science •earth and space science, physical science, chemistry •physical science, life science, chemistry •life science, chemistry, physics

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.)