Enhanced overlay: Weeks 1-2 bootcamp session-08.html may be taught with this lesson. The bootcamp is not the whole course.

Canonical lesson CHEMISTRY20-U1-L21 · outcome 20-A2.8k · depth ENHANCED_BOOTCAMP_OVERLAY

Unit A: Diversity of Matter and Chemical Bonding - outcome 20-A2.8k

• Course: CHEMISTRY20 (SCN2796)
• Lesson ID: CHEMISTRY20-U1-L21
• Official outcome: 20-A2.8k (KNOWLEDGE)
• Object type: canonical lesson (not a bootcamp session)
• Source: Alberta Chemistry 20 Program of Studies (2007, updated 2014)

Official outcome text

relate properties of substances (e.g., melting and boiling points, enthalpies of fusion and vaporization) to the predicted intermolecular bonding in the substances

Learning intention

Meet 20-A2.8k 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

Stronger IMFs raise melting point, boiling point, and enthalpies of fusion/vaporization because more energy is needed to separate molecules. Compare related series: hydrides of Group 16, or alkanes by size.

Worked example

Data card: CH4 bp −161 °C, SiH4 −112 °C (larger London), H2O 100 °C (hydrogen bonding far above the Group 16 trend). Do not light a burner to “see boiling.” Use the table.

Guided practice

1. Using the hydride bp data card only, explain why H2O is far above H2S. No stove boiling.
2. Near-miss: lighting a burner to “see boiling” at home. Name the forbidden setting.

Independent practice

1. Trend CH4 → SiH4 → GeH4 from London forces using given bps.
2. Two sentences: enthalpy of vaporization vs IMF strength (qualitative).
3. Which point is the hydride anomaly on a Group 16 bp sketch?

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

Predicting water should boil near H2S because they are both Group 16 hydrides, ignoring hydrogen bonding.

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

CER: H2O bp 100 °C vs CH4 −161 °C from the table.

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

AI Tutor / human tutor

Ground on 20-A2.8k. 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.