Enhanced overlay: Weeks 1-2 bootcamp session-07.html may be taught with this lesson. The bootcamp is not the whole course.

Canonical lesson CHEMISTRY20-U1-L19 · outcome 20-A2.6k · depth ENHANCED_BOOTCAMP_OVERLAY

Unit A: Diversity of Matter and Chemical Bonding - outcome 20-A2.6k

• Course: CHEMISTRY20 (SCN2796)
• Lesson ID: CHEMISTRY20-U1-L19
• Official outcome: 20-A2.6k (KNOWLEDGE)
• Object type: canonical lesson (not a bootcamp session)
• Source: Alberta Chemistry 20 Program of Studies (2007, updated 2014)

Official outcome text

illustrate, by drawing or by building models, the structure of simple molecular substances

Learning intention

Meet 20-A2.6k 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

A model (ball-and-stick, kit, or labelled drawing) must match the Lewis count and VSEPR shape. Show lone pairs on the central atom when they determine shape (NH3, H2O).

Worked example

Build or draw H2O bent with two lone pairs on O; CH4 tetrahedral; CO2 linear. Paper kits and PhET are allowed; melting plastic is not.

Guided practice

1. Sketch or describe a pipe-cleaner / kit model of NH3 vs BF3. No melting plastic; no eating marshmallows in a lab room.
2. Near-miss: using an open ammonia bottle as a “real VSEPR demo.” Mark why that is not this pack.

Independent practice

1. Model checklist: H2O bent, CH4 tetrahedral, CO2 linear.
2. Two sentences: what a model can and cannot prove about bond angles.
3. Photo or drawing evidence rule: labels required (lone pairs visible or noted).

Diagram / whiteboard

Approved diagram id chem20-ionic-lattice - Ionic lattice / bonding sketch. 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

Building a linear water molecule “because it looks simpler.”

Safety and lab register

Setting: classroom-supervised only for Session 04 conductivity (NaCl / sucrose / ~5% vinegar, 9 V LED or school probe). All other Unit A work is paper, models, data cards, or approved simulation. Forbidden: bleach+acid, bleach+ammonia, flames, tasting, home copy of Session 04, concentrated acids/bases, generating Cl2. 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 labelled drawing of H2O with lone pairs.

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

AI Tutor / human tutor

Ground on 20-A2.6k. 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.