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    Matter and Its Interactions

Students who demonstrate understanding can:

Performance Expectations

  1. 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. MS-PS1-5

    Clarification Statement and Assessment Boundary

A Peformance Expectation (PE) is what a student should be able to do to show mastery of a concept. Some PEs include a Clarification Statement and/or an Assessment Boundary. These can be found by clicking the PE for "More Info." By hovering over a PE, its corresponding pieces from the Science and Engineering Practices, Disciplinary Core Ideas, and Crosscutting Concepts will be highlighted.

By clicking on a specific Science and Engineering Practice, Disciplinary Core Idea, or Crosscutting Concept, you can find out more information on it. By hovering over one you can find its corresponding elements in the PEs.

Planning Curriculum

Common Core State Standards Connections


  • RST.6-8.7 - Integrate quantitative or technical information expressed in words in a text with a version of that information expressed visually (e.g., in a flowchart, diagram, model, graph, or table). (MS-PS1-5)


  • 6.RP.A.3 - Use ratio and rate reasoning to solve real-world and mathematical problems, e.g., by reasoning about tables of equivalent ratios, tape diagrams, double number line diagrams, or equations. (MS-PS1-5)
  • MP.2 - Reason abstractly and quantitatively. (MS-PS1-5)
  • MP.4 - Model with mathematics. (MS-PS1-5)

Model Course Mapping

First Time Visitors

Resources & Lesson Plans

  • More resources added each week!
    A team of teacher curators is working to find, review, and vet online resources that support the standards. Check back often, as NSTA continues to add more targeted resources.
  • The phenomenon of a burning candle is used to introduce the idea of reactants and products.  Students use a paper model of atoms in a combustion reaction to see that atoms are not created or destroyed, only rearranged.  They move on to coun ...

  • Students will view a teacher demonstration then do an activity themselves.  They will compare and contrast the results and methods, to determine why the results were different.  Students will use knowledge about conservation of mass and an ...

  • In this interactive simulation, users adjust the coefficients in an equation while the molecules are depicted in a box above the equation. This allows the users to visualize what the symbols in the chemical equation actually mean. They can count the ...

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Planning Curriculum gives connections to other areas of study for easier curriculum creation.