TCAP Science Grade 5 Practice Questions - Tennessee Comprehensive Assessment Program Science Grade 5 Exam

Why does an iron nail rust when left outside in humid air for several weeks?

The iron evaporates into oxygen gas. The iron absorbs sunlight and changes color. The iron reacts chemically with oxygen and water to form rust. The iron breaks apart into smaller physical pieces without changing chemically.

Correct Answer:

The iron reacts chemically with oxygen and water to form rust.

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