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The steel of your bike contains iron, which becomes iron oxide [which is rust]. It has reacted with oxygen in the air. Water in the air makes this happen more easily which is why you should keep your bike dry, or at least keep your bike painted well so that the iron/steel doesn't come in contact with air. The iron and oxygen were separate at the beginning, and are bonded together into a new substance at the end, so that tells us that this is a chemical change.

A physical change is one where no new substance is made, but the substances we already had get reorganised. For example. when water boils, the steam is still the same molecule, water, just reorganised.

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