Canonical lesson CHEMISTRY20-U3-L34 · outcome 20-C2.1s · depth CURRICULUM_BASELINE

Unit C: Solutions, Acids, Bases and Equilibrium intro - outcome 20-C2.1s

• Course: CHEMISTRY20 (SCN2796)
• Lesson ID: CHEMISTRY20-U3-L34
• Official outcome: 20-C2.1s (SKILL)
• Object type: canonical lesson (not a bootcamp session)
• Source: Alberta Chemistry 20 Program of Studies (2007, updated 2014)

Official outcome text

formulate questions about observed relationships and plan investigations of questions, ideas, problems and issues • design an experiment to differentiate among acidic, basic and neutral solutions (IP-NS2) • design an experiment to differentiate between weak and strong acids and between weak and strong bases (IP-NS2) • describe procedures for the safe handling, storage and disposal of materials used in the laboratory, with reference to WHMIS and consumer product labelling information (IP-ST3)

Learning intention

Meet 20-C2.1s 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

Design experiments to classify acidic/basic/neutral and strong vs weak using indicators, pH, conductivity - WHMIS first.

Worked example

Plan: same concentration acids - measure pH and conductivity; predict strong lower pH / higher conductivity. Materials: school dilute HCl, acetic, indicators, probe or paper.

Guided practice

1. Write the plan with controls.
2. Near-miss: tasting. Forbidden.

Independent practice

1. Include weak vs strong base comparison if materials allow, else dataset.
2. Disposal and PPE lines.
3. Dataset alternative named.

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

Using drain cleaner as “strong base.”

Safety and lab register

Setting: School dilute reagents or dataset. No drain cleaners. 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-page classification plan.

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

AI Tutor / human tutor

Ground on 20-C2.1s. 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.