Canonical lesson CHEMISTRY20-U3-L18 · outcome 20-C1.2s · depth CURRICULUM_BASELINE

Unit C: Solutions, Acids, Bases and Equilibrium intro - outcome 20-C1.2s

• Course: CHEMISTRY20 (SCN2796)
• Lesson ID: CHEMISTRY20-U3-L18
• Official outcome: 20-C1.2s (SKILL)
• Object type: canonical lesson (not a bootcamp session)
• Source: Alberta Chemistry 20 Program of Studies (2007, updated 2014)

Official outcome text

conduct investigations into relationships among observable variables and use a broad range of tools and techniques to gather and record data and information • use a conductivity apparatus to differentiate solutions (PR-NS2) [ICT C6-4.4] • perform an experiment to determine the concentration of a solution (PR-NS3, PR-NS5) • use a balance and volumetric glassware to prepare solutions of specified concentrations (PR-NS2, PR-NS5) • perform an investigation to determine the solubility of a solute in a saturated solution (PR-ST3, PR-NS5) [ICT C6-4.2]

Learning intention

Meet 20-C1.2s 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

Perform: conductivity to differentiate; prepare a specified mol/L with balance + volumetric flask; solubility of a saturated sample if teacher-scheduled - else table.

Worked example

Checklist: weigh 2.650 g Na2CO3 example OR your assigned mass; dissolve; dilute to mark; record. Conductivity on NaCl vs sucrose from register.

Guided practice

1. Complete preparation record with actual masses.
2. Near-miss: inventing probe readings. Mark integrity.

Independent practice

1. Conductivity classification of three given solutions.
2. One saturated-solubility row from teacher or table.
3. WHMIS before pouring.

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 a kitchen jug as a volumetric flask for diploma-style claims.

Safety and lab register

Setting: School glassware. CHEM20 lab register. No home prep of acids. 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

Preparation record + conductivity classifications.

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

AI Tutor / human tutor

Ground on 20-C1.2s. 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.