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  • Middle School

    Structure and Properties of Matter

Students who demonstrate understanding can:

Performance Expectations

  1. Develop models to describe the atomic composition of simple molecules and extended structures. MS-PS1-1

    Clarification Statement and Assessment Boundary
  2. Gather and make sense of information to describe that synthetic materials come from natural resources and impact society. MS-PS1-3

    Clarification Statement and Assessment Boundary
  3. 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-PS1-4

    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.

Science and Engineering Practices

Developing and Using Models

Modeling in 6–8 builds on K–5 experiences and progresses to developing, using, and revising models to describe, test, and predict more abstract phenomena and design systems.

Disciplinary Core Ideas

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.6-8.1 - Cite specific textual evidence to support analysis of science and technical texts. (MS-PS1-3)
  • 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-PS1-1), (MS-PS1-4)
  • WHST.6-8.8 - Gather relevant information from multiple print and digital sources, using search terms effectively; assess the credibility and accuracy of each source; and quote or paraphrase the data and conclusions of others while avoiding plagiarism and following a standard format for citation. (MS-PS1-3)


  • 6.NS.C.5 - Understand that positive and negative numbers are used together to describe quantities having opposite directions or values (e.g., temperature above/below zero, elevation above/below sea level, credits/debits, positive/negative electric charge); use positive and negative numbers to represent quantities in real-world contexts, explaining the meaning of 0 in each situation. (MS-PS1-4)
  • 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-PS1-1)
  • 8.EE.A.3 - Use numbers expressed in the form of a single digit times an integer power of 10 to estimate very large or very small quantities, and to express how many times as much one is than the other. (MS-PS1-1)
  • MP.2 - Reason abstractly and quantitatively. (MS-PS1-1)
  • MP.4 - Model with mathematics. (MS-PS1-1)

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.
  • This lesson (1.2) is the second lesson in Chapter 1: Matter-Solids, Liquids, and Gases from Middle School Chemistry produced by ACS. The lesson, which is outlined comprehensively in the lesson plan, follows the BSCS 5E Instructional Model. It begins…

  • This simulation allows the user to choose one of four substances (A, Ne, O2, H2O), vary the temperature of the container and observe the behavior of the particles of the substance providing a straightforward means to observe the relationsh…

  • The simulation and associated worksheets direct students to build a few simple molecules such as H2O and NH3. The simulation acknowledges only correct combinations, identifies the molecule and provides a space-filling and stick model for e…

  • This is the second chapter in the American Chemical Society (ACS)  program Middle School Chemistry. This chapter contains five lessons or activities:

    1. This lesson (2.2) is the second lesson in Chapter 2: Changes of State from Middle School Chemistry produced by ACS.

      The lesson, which is outlined comprehensively in the lesson plan, follows the BSCS 5E Instructio…

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