MSA Grade 8 Science Practice Questions - Montana Science Assessment - Grade 8 Exam

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A student observes four changes. Which observation is evidence of a chemical reaction rather than only a physical change?

An ice cube melts into a puddle of liquid water on a counter A piece of chalk is crushed into a fine powder Vinegar is added to baking soda and bubbles of a new gas form while the mixture cools slightly Sand and iron filings are stirred together but can still be separated with a magnet

Correct Answer:

Vinegar is added to baking soda and bubbles of a new gas form while the mixture cools slightly

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