Canonical lesson CHEMISTRY20-U1-L20 · outcome 20-A2.7k · depth CURRICULUM_BASELINE

Unit A: Diversity of Matter and Chemical Bonding - outcome 20-A2.7k

• Course: CHEMISTRY20 (SCN2796)
• Lesson ID: CHEMISTRY20-U1-L20
• Official outcome: 20-A2.7k (KNOWLEDGE)
• Object type: canonical lesson (not a bootcamp session)
• Source: Alberta Chemistry 20 Program of Studies (2007, updated 2014)

Official outcome text

explain intermolecular forces, London (dispersion) forces, dipole-dipole forces and hydrogen bonding

Learning intention

Meet 20-A2.7k 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

Intermolecular forces act between molecules. London (dispersion) forces exist in all molecules and increase with more electrons/larger clouds. Dipole-dipole forces act between permanent dipoles. Hydrogen bonding is a strong dipole attraction when H is bonded to N, O, or F and approaches another N, O, or F lone pair. Hydrogen bonding is not a covalent H-O bond inside the water molecule.

Worked example

CH4: London only. HCl: dipole-dipole plus London. H2O: hydrogen bonding plus London. I2(s): London only, yet solid at room temperature because the electron cloud is large.

Guided practice

1. Rank IMFs in F2, HF, and HCl. Do not copy CH4/HCl/H2O/I2 unchanged.
2. Near-miss: calling hydrogen bonding intramolecular in H2O(l). Mark the first wrong line.

Independent practice

1. Why I2 is solid at room temperature with only London forces.
2. Two sentences: dipole-dipole vs hydrogen bonding criteria (H on N, O, or F).
3. Classify IMFs in CH3OH.

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

Calling the O-H covalent bond “hydrogen bonding,” or saying nonpolar molecules have no IMFs.

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

Three-row table: CH4, HCl, H2O - dominant IMF.

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

AI Tutor / human tutor

Ground on 20-A2.7k. 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.