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Chemical reactions happen when _____. a.atoms attract or repel one another b.heat is created by friction c. two or more substances are mixed substances are heated or d.cooled
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Chemical reactions happen when _____. a.atoms attract or repel one another b.heat is created by friction c. two or more substances are mixed substances are heated or d.cooled

User Rickyrobinett
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A

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User GotoFinal
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