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Over time, iron becomes rust when it combines with water and oxygen. Which type of change must occur for rust to form?

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The questions have been asked in several important state and regional science exams in the United States. For example: TAKS-Texas Assessment of Knowledge and Skills, New York State Educational Department Regents exams, California Standards Test, etc.


1. Over time, iron becomes rust when it combines with water and oxygen. Which type of change must occur for rust to form?





 
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