The Oxidation of Iron to Rust Is a Problem Structural

question 99

Multiple Choice

The oxidation of iron to rust is a problem structural engineers need to be concerned about,but the oxidation of aluminum to aluminum oxide is not so much of a problem.Why?

• A)Since aluminum is so light and inexpensive,it is easily replaced when corroded.
• B)Aluminum oxide is insoluble in water and thus forms a protective coating that prevents continued oxidation of the aluminum.
• C)Aluminum oxide is even stronger than aluminum.
• D)The oxidation of aluminum is a very slow reaction,taking hundreds of years before any structural changes are noticed.

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Definitions:

Voluntary Control

The ability to consciously regulate bodily movements or actions through the nervous system.

Epiglottis

A flap of cartilage at the root of the tongue, which is depressed during swallowing to cover the opening of the windpipe.

Uvula

A small fleshy extension at the back of the soft palate which hangs above the throat and plays a role in speech and swallowing.

Upper Esophageal Sphincter

The muscular ring located at the top of the esophagus that controls the passage of food into the esophagus from the throat.