WY-TOPP Science Grade 8 Practice Questions - WY-TOPP Summative Assessment - Grade 8 Science Exam

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Which of the following observations provides the clearest evidence that a chemical reaction has occurred rather than a physical change?

An iron nail left outside turns reddish-brown and forms rust. An ice cube melts into a puddle of liquid water on a warm desktop. A piece of paper is shredded into small confetti strips. Table salt dissolves completely in a glass of warm water.

Correct Answer:

An iron nail left outside turns reddish-brown and forms rust.

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