Canonical lesson CHEMISTRY20-U3-L36 · outcome 20-C2.3s · depth CURRICULUM_BASELINE

Unit C: Solutions, Acids, Bases and Equilibrium intro - outcome 20-C2.3s

• Course: CHEMISTRY20 (SCN2796)
• Lesson ID: CHEMISTRY20-U3-L36
• Official outcome: 20-C2.3s (SKILL)
• Object type: canonical lesson (not a bootcamp session)
• Source: Alberta Chemistry 20 Program of Studies (2007, updated 2014)

Official outcome text

analyze data and apply mathematical and conceptual models to develop and assess possible solutions • use indicators to determine the pH for a variety of solutions (PR-NS2, AI-NS6) • assess, qualitatively, the risks and benefits of producing, using and transporting acidic and basic substances, based on WHMIS and transportation of dangerous goods guidelines (AI-ST2)

Learning intention

Meet 20-C2.3s with instruction, practice, and a check. The 10-session bootcamp does not replace this lesson.

Success criteria

1. Restate the outcome in classroom language without swapping in a different unit’s template.
2. Complete the worked-style task for this outcome.
3. Name the lab setting (classroom-supervised / teacher demo / dataset or simulation / forbidden).

Teaching

Use indicators to estimate pH; qualitatively assess risks of producing/using/transporting acids and bases with WHMIS/TDG language.

Worked example

Indicator results for three unknowns (school). Risk: concentrated vs dilute HCl transport labels differ - explain using the card.

Guided practice

1. Match indicator colours to pH ranges on a card.
2. Near-miss: open transport of unlabelled acid. Mark it.

Independent practice

1. Risk paragraph for one product.
2. Two sentences: AI-ST2 assessment.
3. No field transport tasks.

Diagram / whiteboard

Approved diagram id chem20-ph-scale - pH scale / solution concentration axes. Tutor may open the course whiteboard and display this id. Do not invent hazardous procedures on the board.

Checks for understanding

Use the formative evidence below as the exit check for this outcome. Correct the misconception named in this lesson before praising.

Misconception to repair

Ignoring concentration when reading hazard.

Safety and lab register

Setting: School labelled reagents only. AI Tutor must not invent labs outside CHEM20_LOW_RESOURCE_LAB_REGISTER.csv.

Alberta Poison Control if a real exposure is occurring: 1-844-764-7669. The AI Tutor is not a poison centre.

Formative evidence

Indicator results + one TDG/WHMIS risk paragraph.

This is not a diploma. Mastery needs instruction + activity + check.

AI Tutor / human tutor

Ground on 20-C2.3s. No false praise. No invented procedures. No silent skip to a different unit. Human tutor if the student describes mixing bleach, tasting, or flames.

Provenance

Official POS wording from ALBERTA_SENIOR_HIGH_OFFICIAL_OUTCOMES.csv. Pack lesson written to replace Wave-4 contaminated canonical markdown.