Canonical lesson CHEMISTRY20-U3-L19 · outcome 20-C1.3s · depth CURRICULUM_BASELINE

Unit C: Solutions, Acids, Bases and Equilibrium intro - outcome 20-C1.3s

• Course: CHEMISTRY20 (SCN2796)
• Lesson ID: CHEMISTRY20-U3-L19
• Official outcome: 20-C1.3s (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 experimental data to determine the concentration of a solution (AI-NS3) [ICT C6-4.1] • evaluate the risks involved in the handling, storage and disposal of solutions commonly used in the laboratory and in the home (AI-SEC2, PR-NS5)

Learning intention

Meet 20-C1.3s 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

Calculate concentration from mass/volume data; evaluate handling/storage/disposal risks for common lab and household solutions using WHMIS language.

Worked example

From a given mass and volume, compute mol/L. Risk table: vinegar ~5% vs concentrated HCl (school) - storage, PPE, disposal differ.

Guided practice

1. Compute c from provided empirical data.
2. Near-miss: pouring leftovers to sink against label. Mark it.

Independent practice

1. Risk table three rows.
2. Two sentences: AI-SEC2 risk evaluation.
3. Sig figs on c.

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

Treating all “acids” as equally hazardous.

Safety and lab register

Setting: Follow WHMIS; no unauthorized disposal. 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

One concentration calculation + risk table.

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

AI Tutor / human tutor

Ground on 20-C1.3s. 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.