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- the mass of the initial iron is increased

- the color and appearance of iron oxides is different compared to the color of iron

- the physical properties are modified

- the chemical properties are modified

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10y ago
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9y ago

When iron rusts, it changes color to a reddish-brown pigment. That is one true sigh of a chemical reaction as the iron will also weaken in terms of structural strength.

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12y ago

because iron can't unrust, so you cant change that

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11y ago

Yes. The Iron has reacted with the Oxygen in the air over time to form the compound Iron (II) Oxide.

Formula:

2Fe (s) + O2 (g) -> 2FeO (s)

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7y ago

A porous layer of red iron oxide and hydroxide is formed.

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Q: How do we know that a chemical reaction takes place when iron rusts?
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