Two measurements disagree even though both were recorded carefully.
Learning target
Build an initial model and explanation for: How do chemists protect people and evidence while measuring matter?
Evidence task
Record observations, questions, an initial model, and one claim that could be tested. Use these concepts where relevant: hazard; PPE; SDS; significant figures; uncertainty; dimensional analysis.
Significant figures, percent error, unit conversion, density.
Evidence task
Show units, setup, calculation or graph reasoning, then write what the quantitative evidence can and cannot establish about: How do chemists protect people and evidence while measuring matter?
Safety/SDS literacy; balance/volume simulation or supervised measurement; never mix household chemicals.
Safety boundary
Use the course safety charter. If supervision, facilities, materials, or conditions are not appropriate, use the supplied-data/simulation alternative rather than improvising hazardous procedures.
Evidence task
Record variables or design constraints, procedure/model, observations/data, and one revision you would make after reviewing the evidence.
Answer the essential question: How do chemists protect people and evidence while measuring matter?
Mastery evidence
Submit a claim, at least two specific pieces of evidence, reasoning that connects them, one limitation/counterclaim, and a correction note for any essential concept below 80%.
Portfolio
Select one artifact from this week and explain why it is trustworthy evidence of growth.