The rusting of Clara's bike in which iron changes to rust is a chemical change. In a chemical change:the process is not easily reversibleleads to the production of a new kind of matter involves mass changesrequires considerable amount of energy
The chemical equation for the reaction is:
4Fe + 3O₂ → 2Fe₂O₃
Here, iron combines with oxygen gas to produce iron oxide which is called rust.
A chemical change has occured.
Answer : The correct option is, (C) a chemical reaction
Rusting of iron : It is a chemical reaction because when an iron rusts, the molecules of iron react with the molecules of oxygen to form a iron oxide as a product.
Precipitate formation : It is formed when the anion and cation in the aqueous solution react together to form an insoluble ionic solids. This insoluble ionic solid is called as precipitate.
Exothermic reaction : During a chemical reaction, the heat or energy is released by the system into the surroundings is known as exothermic reaction.
Due to the chemical reaction, Ciara’s bike rusted which means that the iron in the metal changed to rust.
Hence, the correct answer is, (C) a chemical reaction
C. a chemical reaction
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