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Which change is exothermic? (1) freezing of water(2) melting of iron(3) vaporization of ethanol(4) sublimation of iodine
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Which change is exothermic?

(1) freezing of water(2) melting of iron(3) vaporization of ethanol(4) sublimation of iodine

User Fredrik L
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The answer is (1) freezing of water. The energy of different status is increase from solid to liquid to gas. So the change of liquid to solid is exothermic. The other three are endothermic.
User Rudik
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