OSAS Science Grade 5 Practice Questions - Oregon Statewide Assessment System - Science, Grade 5 Exam

A student observes four changes. Which observation provides the best evidence that a chemical change has occurred?

A piece of chalk is broken into smaller pieces An ice cube melts into a puddle on a table A steel nail left outside forms reddish-brown rust over several days Sugar dissolves in warm water, making the water taste sweet

Correct Answer:

A steel nail left outside forms reddish-brown rust over several days

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