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CHEMISTRY!7th grade chemistry unit.
MS-PS1-1 Develop models to describe the atomic composition of simple molecules and extended structures. MS-PS1-2 Analyze and interpret data on the properties of substances before and after the substances interact to determine if a chemical reaction has occurred. MS-PS1-5 Develop and use a model to describe how the total number of atoms does not change in a chemical reaction and thus mass is conserved. |
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