Safety boundary
Use supplied kinetics datasets and approved simulations. No unsupervised reactive mixtures are required.
Explicit chemistry instruction
This investigation uses supplied or simulated data only.
Preserve the raw time-concentration table before graphing or fitting.
Calculate at least one early and one late rate, then compare whether a constant-rate or changing-rate model better fits the evidence.
Vocabulary: kinetics dataset; rate curve; slope; residual; model fit.
Worked example
A dataset with progressively smaller concentration changes per 10 s interval supports a slowing reaction rather than a constant-rate model.
Guided question
Which residual pattern would make a constant-rate line model doubtful?
Independent work
- Preserve raw data.
- Graph concentration versus time.
- Calculate two interval rates.
- Compare one simple model and record residuals/uncertainty.
Investigation / Data Lab
Use supplied or simulated kinetics data. Preserve raw values, graph, rate calculations, residuals, uncertainty, and one revision.
Misconception check
A visually smooth curve does not remove measurement uncertainty.
Formative check
What makes a rate-model comparison reproducible?
Reveal response
Raw data, stated model, calculated residuals, and uncertainty.
Mentor evidence conference
Ask Archaemenes to audit graph slopes, units, controlled variables, and model limits.
Teacher guidance
Foundation: Use supplied graph templates.
Core: Complete graph/rate analysis.
Extended: Fit and compare two simple models.