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Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425

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BuyFindarrow_forward

Introductory Chemistry: A Foundati...

9th Edition
Steven S. Zumdahl + 1 other
ISBN: 9781337399425
Textbook Problem
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59. Pure iron ordinarily rusts quickly, but steel does not corrode nearly as fast. How does steel resist corrosion?

Interpretation Introduction

Interpretation:

The corrosion resistant nature of steel should be explained.

Concept Introduction:

The oxidation and reduction can be identified by change in oxidation state. If oxidation state of atom of an element increases, it undergoes oxidation and if it decreases, it undergoes reduction.

The general oxidation and reduction half reactions are as follows:

AsA+aq+e

Here, As undergoes oxidation to form A+aq with release of 1 electron. The oxidation state of A increases from 0 to 1.

Similarly,

B+aq+eBs

Here, B+aq undergoes reduction to form Bs with addition of 1 electron. The oxidation state of A decreases from 1 to 0.

Explanation

Pure iron can be oxidized easily when meet air and moisture. The process is known as rusting of iron. Rusting results in the formation of layer of oxygen on the surface of iron and iron oxide is formed.

The iron oxide so formed is also known as iron oxide which is red oxide formed after the oxidation-reduction reaction of iron and oxygen due to moisture in air. Rust consist of hydrate of the iron (III) oxide.

The reaction is as follows:

Fes+O2g

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