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Why is Rusting a chemical change?

by khristine


Why is Rusting a chemical change?

Chemical change can be defined in its simplest manner as a reaction” that happens when two or more molecules interact with each other and produce a new form of substance. In the case of rusting, a chemical change takes place when iron (Fe) on metal comes together with oxygen (O2), which is in the atmosphere, and then creates rust (FE2O3) or the red substance commonly seen on steel and metal objects that are products of either oxidation or weathering.

Rusts are a product of chemical change in a way that iron substances on metals, before they interact with another matter, are completely altered in the process thus producing a new substance that is rust. The changes that happen are permanent in nature and irreversible.

Rusts are also known as iron oxide which is a common compound. It is said to be common” because iron merges easily with oxygen, which is why it is hard to find a pure iron in its natural form. Rusting on iron is an example of corrosion” or the deterioration of metals because of a chemical reaction. There are three things that are included that produces iron oxide and these are iron, oxygen, and water. Below is the brief explanation on the process of rusting.

When water gets in touch with an iron substance (like steel or metal) an immediate reaction occur that initiates chemical change. The water that acts as a good electrolyte then merges with carbon dioxide in the air. The process then creates a weak carbonic acid which is also an enhanced electrolyte. While the acid is forming, the iron is diffused and few quantities of water will also start to break down to its primary molecular components, oxygen and hydrogen. The released oxygen plus the diffused iron joins together and then results to iron oxide.

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