2020 CH-PS1-7

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The Oklahoma Academic Standards for Science (OAS-S) are three-dimensional performance expectations representing the things students should know, understand, and be able to do to be proficient in science and engineering. Performance expectations are considered standards and include a science and engineering practice (indicated in blue and represent everyday skills of scientists and engineers), disciplinary core ideas (represented in orange and represent science ideas used by scientists and engineers), and a crosscutting concept (indicated in green and represent ways of thinking like scientists and engineers).

Each dimension in the OAS-S grows in complexity and sophistication across the grades. To learn more about the prior knowledge and skills students have developed (or future knowledge/skills) associated with that specific dimension, each section in the standard below is hyperlinked to that specific vertical learning progression page.

Chemistry (CH) Matter and Its Interactions
CH.PS1.7 Use mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction
Clarification Statement: Mathematical representations could include balanced chemical equations that represent the laws of conservation of mass and constant composition (definite proportions) and mass-to-mass stoichiometry. The mole concept and stoichiometry are used to show proportional relationships between masses of reactants and products.
Assessment Boundary: Assessment does not include complex chemical reactions. Emphasis is on assessing students’ use of mathematical reasoning and does not include recall of mathematical equations and rote application of problem-solving techniques.
Science and Engineering Practices	Disciplinary Core Ideas	Crosscutting Concepts
Using Mathematics and Computational Thinking Use mathematical representations of phenomena to support claims.	Chemical Reactions The fact that atoms are conserved, together with knowledge of the chemical properties of the elements involved, can be used to describe and predict chemical reactions.	Energy and Matter The total amount of energy and matter in closed systems is conserved.
Connections to other Performance Expectations in Chemistry
Matter Transformations