## Matter and Its Interactions

#### Students who demonstrate understanding can:

Use mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction. HS-PS1-7

Clarification Statement and Assessment Boundary

Clarification Statement: Emphasis is on using mathematical ideas to communicate the proportional relationships between masses of atoms in the reactants and the products, and the translation of these relationships to the macroscopic scale using the mole as the conversion from the atomic to the macroscopic scale. Emphasis is on assessing students’ use of mathematical thinking and not on memorization and rote application of problem-solving techniques

Assessment Boundary: Assessment does not include complex chemical reactions.]

##### Science and Engineering Practices

Using Mathematics and Computational Thinking

Mathematical and computational thinking in 9–12 builds on K–8 experiences and progresses to using algebraic thinking and analysis, a range of linear and nonlinear functions including trigonometric functions, exponentials and logarithms, and computational tools for statistical analysis to analyze, represent, and model data. Simple computational simulations are created and used based on mathematical models of basic assumptions.

##### Disciplinary Core Ideas

PS1.BChemical Reactions

##### Crosscutting Concepts

Energy and Matter

###### Connections to Nature of Science

Scientific Knowledge Assumes an Order and Consistency in Natural Systems

### Common Core State Standards Connections

Mathematics
• HSN-Q.A.1 - Use units as a way to understand problems and to guide the solution of multi-step problems; choose and interpret units consistently in formulas; choose and interpret the scale and the origin in graphs and data displays. (HS-PS1-7)
• HSN-Q.A.2 - Define appropriate quantities for the purpose of descriptive modeling. (HS-PS1-7)
• HSN-Q.A.3 - Choose a level of accuracy appropriate to limitations on measurement when reporting quantities. (HS-PS1-7)
• MP.2 - Reason abstractly and quantitatively. (HS-PS1-7)

National Science Teaching Association
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