A pot is half-filled with water, and a lid is placed on it, forming a tight seal so that no water vapor can escape. The pot is heated on a stove, forming water vapor inside the pot. The heat is then turned off and the water vapor condenses back to liquid. Is this cycle reversible or irreversible? Why?
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By reversible, if you mean that on heating it again, will the entire process repeat itself, then yes, of course it will as heating of water is a physical change, not a chemical one. Is this what you were asking?