Different substances change indicator behavior in repeatable ways.
Learning target
Build an initial model and explanation for: What do competing acid–base models explain?
Evidence task
Record observations, questions, an initial model, and one claim that could be tested. Use these concepts where relevant: acid; base; proton donor/acceptor; conjugate pair; amphoteric.
Classify acid/base reactions and simple concentration relations.
Evidence task
Show units, setup, calculation or graph reasoning, then write what the quantitative evidence can and cannot establish about: What do competing acid–base models explain?
Use virtual indicators or teacher-supervised food-safe indicator only; never mix cleaners.
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: What do competing acid–base models explain?
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.