KSA Science Grade 7 Practice Questions - Kentucky Summative Assessment Science - Grade 7 Exam

Which observation provides the best evidence that a chemical reaction has taken place when two substances are mixed?

The mixture changes shape when poured into a container A solid dissolves completely in liquid water An unexpected color change occurs and gas bubbles form The mixture splits into two separate layers due to gravity

Correct Answer:

An unexpected color change occurs and gas bubbles form

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