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Why is the rusting of an iron pole not a physical change?

Answer 1

In fact, the rusting of iron is quite clearly an example of chemical change.

Strong chemical bonds are formed and broken as well as new substances are created during chemical change.

Both processes manifestly occur when iron metal oxidizes to give #FeO# and #Fe_2O_3#. We've all seen pictures of the monumental bridges around the world, the Golden Gate on the west coast of the States, the Hell's Gate bridge in New York, and of course the Sydney Harbour Bridge. To this day there would be dedicated teams of corrosion engineers assessing the extent of oxidation, and trying to control the process.

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Answer 2

Kai Bowman

Physical changes only affect the state or appearance of a substance; they do not affect its chemical composition. The rusting of an iron pole is a chemical change because it involves a reaction between iron and oxygen to form iron oxide.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.