Michigan M-STEP Grade 5 Science Practice Questions - Michigan Student Test Of Educational Progress Grade 5 Science Exam

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A steel anchor recovered from the Detroit River has turned reddish-brown and flaky over time. Which type of change caused rust to form on the anchor?

A chemical change because iron reacted with oxygen and water to form a new substance (rust). A physical change because the anchor simply changed shape. A phase change because solid iron melted into liquid rust. A mechanical change caused by water pressure alone.

Correct Answer:

A chemical change because iron reacted with oxygen and water to form a new substance (rust).

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