iron does not burn on heating but iron fillings burns vigorously when sprinkled in the flame of burner. why?
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For burning to occur, the surface in contact with the air must be heated to its ignition temperature. ... An iron rod will not burn as it has relatively very less surface area per unit mass but ironfilings with more surface area per unit mass can burn in air and get converted to iron oxide.
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Iron has a strong molecular force of attraction. Hence when heated it doesn't reach to its ignition temperature and doesn't burn. But iron fillings when sprinkled in flames attain the ignition temperature ( as iron fillings are comparatively smaller particles) and gain larger surface area for the reaction.
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