Question

what evidence of a chemical reaction might you see in rusting of an iron nail

Answer 1

The nail would not be it's original color. The rust would show. 

Answer 2

The statement, that describes evidence of rusting is "color change."

What is rusting?

Rusting is described as the chemical process through which a red or orange coat forms on the surface of metals. Corrosion includes rusting. Rusting is described as the chemical process through which a red or orange coat forms on the surface of metals. Corrosion includes rusting. Rusting is an example of an oxidation reaction.

Rust production occurs when iron is exposed to air and moisture. The process then produced a new material, iron(III) oxide. The colour of the iron's surface also changes. As a result, iron rusting is a chemical change. A colour change (rust is reddish) indicates a chemical change.

Hence the correct answer is color change.

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