Performance expectationAnalyze data to support the claim that the combined gas law describes the relationships among volume, pressure, and temperature for a sample of an ideal gas.
HS-PS1-9 is unique to New York State — it does not appear in the national NGSS set for Chemistry, which is why practice material for it is so hard to find.
Real gases may be included at conditions near STP. The relationships of the variables in the combined gas law may be described both qualitatively and quantitatively.
Assessment is limited to the relationships among the variables of the combined gas law, not the gas law names, i.e. Boyle's Law.
Every item written to HS-PS1-9 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.
Analyzing and Interpreting Data
What a student at each level can do with HS-PS1-9. 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 relationships among gas variables from provided data.
Calculate or represent an unknown gas-law variable when other values are provided.
Use data as evidence to support gas-law relationships.
Analyze data to support the combined gas law relationship.
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.