Enhanced overlay: Weeks 1-2 bootcamp session-06.html may be taught with this lesson. The bootcamp is not the whole course.

Canonical lesson CHEMISTRY20-U1-L16 · outcome 20-A2.3k · depth ENHANCED_BOOTCAMP_OVERLAY

Unit A: Diversity of Matter and Chemical Bonding - outcome 20-A2.3k

• Course: CHEMISTRY20 (SCN2796)
• Lesson ID: CHEMISTRY20-U1-L16
• Official outcome: 20-A2.3k (KNOWLEDGE)
• Object type: canonical lesson (not a bootcamp session)
• Source: Alberta Chemistry 20 Program of Studies (2007, updated 2014)

Official outcome text

relate electron pairing to multiple and covalent bonds

Learning intention

Meet 20-A2.3k 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 covalent bond is a shared pair. A double bond is two shared pairs; a triple bond is three. Lewis octets are often completed by multiple bonds when a single pair is not enough (O2, N2, CO2, C2H4).

Worked example

N2: each N has 5 valence electrons; a triple bond plus a lone pair on each N gives octets. O2: double bond. CO2: two double bonds from C to each O.

Guided practice

1. Lewis for HCN: show the triple bond. Do not generate HCN gas - paper only. Do not copy N2/O2/CO2 unchanged.
2. Near-miss: single bonds only in CO2 because “carbon wants four singles.” Mark the first wrong line.

Independent practice

1. Compare bond order in N2 vs O2 vs F2.
2. Two sentences: pairing and octets in a triple bond.
3. Electron count for CO2 (16) vs a false 20-electron structure.

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

Counting a double bond as “one electron pair” when checking octets, or drawing NaCl as a shared pair.

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

Lewis sketches: N2 and CO2 with bond orders labelled.

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

AI Tutor / human tutor

Ground on 20-A2.3k. 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.