Overview

Unit Two covers physical and chemical properties, mixtures, solutions, and compounds, atomic structure and the periodic table, elements and compounds. Includes background and topic-specific material in accord with the following NGSS standards: 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-PS1-3: Gather and make sense of information to describe that synthetic materials come from natural resources and impact society. MS-PS1-4: Develop a model that predicts and describes changes in particle motion, temperature, and state of a pure substance when thermal energy is added or removed. 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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