Explore the law of conservation of mass. model a physical or chemical change, and then demonstrate how mass is conserved before and after the change. the image shows how the total number of atoms before and after a chemical reaction equals one another two purple circles plus two red circles to make a new substance with two molecules each made up of one red circle attached to one purple circle
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Explore the law of conservation of mass. model a physical or chemical change, and then demonstrate h...
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