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MS-PS1-5

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MS-PS1-5 Matter and Its Interactions
Students who demonstrate understanding can: 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.
Clarification Statement: Emphasis is on law of conservation of matter and on physical models or drawings, including digital forms, that represent atoms.
Assessment Boundary: Assessment does not include the use of atomic masses or intermolecular forces.
Crosscutting Concepts	Science & Engineering Practices	Disciplinary Core Ideas
Energy and Matter: Matter is conserved because atoms are conserved in physical and chemical processes.	Developing and Using Models: Modeling in 6–8 builds on K–5 and progresses to developing, using and revising models to describe, test, and predict more abstract phenomena and design systems. Develop a model to describe unobservable mechanisms.	Chemical Reactions: Substances react chemically in characteristic ways. In a chemical process, the atoms that make up the original substances are regrouped into different molecules, and these new substances have different properties from those of the reactants. The total number of each type of atom is conserved, and thus the mass does not change. Science Models, Laws, Mechanisms, and Theories Explain Natural Phenomena: Laws are regularities or mathematical descriptions of natural phenomena.