Performance expectationUse mathematical representations to support the claim that atoms, and therefore mass, are conserved during a chemical reaction.
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 does not include complex chemical reactions.
Every item written to HS-PS1-7 has to assess all three dimensions together, not the content alone. This is the structural change that made older practice material stop matching the exam.
Using Mathematics and Computational Thinking
What a student at each level can do with HS-PS1-7. These drive how a cluster spreads difficulty across its items.
Summarised by ScienceIQ from the NYSED Performance Level Descriptions for Physical Science: Chemistry. These are our wording, not the Department’s — the official descriptions are the authority.
Identify mathematical representations showing conservation of atoms or mass.
Use or complete a mathematical representation showing conservation.
Construct a mathematical representation or calculate a conserved quantity.
Use mathematical representations to support the claim that atoms and mass are conserved.
Phenomenon stimulus, connected items across the required types, answer key, rubric and figures drawn deterministically from a structured spec — in the format your students will sit.