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15. classify each statement as an observation, a law, or a theory. when a metal is burned in a closed container, the sum of the masses of the container and its contents does not change. matter is made of atoms. matter is conserved in chemical reactions. when wood is burned in a closed container, its mass does not change.
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15. classify each statement as an observation, a law, or a theory. when a metal is burned in a close...
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