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The Law of Conservation of Mass is a fundamental principle of classical physics that matter cannot be created or destroyed in an isolated system.
Added 11/21/2015 11:28:42 AM
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Product is something produced by human or mechanical effort or by a natural process.
Added 11/21/2015 11:32:50 AM
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A reactant is a substance that changes in a chemical reaction.
Added 11/21/2015 11:33:29 AM
This answer has been confirmed as correct and helpful.