Canonical lesson CHEMISTRY20-U1-L25 · outcome 20-A2.2sts · depth CURRICULUM_BASELINE

Unit A: Diversity of Matter and Chemical Bonding - outcome 20-A2.2sts

• Course: CHEMISTRY20 (SCN2796)
• Lesson ID: CHEMISTRY20-U1-L25
• Official outcome: 20-A2.2sts (STS)
• Object type: canonical lesson (not a bootcamp session)
• Source: Alberta Chemistry 20 Program of Studies (2007, updated 2014)

Official outcome text

explain that scientific knowledge and theories develop through hypotheses, the collection of evidence, investigation and the ability to provide explanations (NS2) • relate chemical properties to predicted intermolecular bonding by investigating melting and boiling points

Learning intention

Meet 20-A2.2sts 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

Theories are tested against evidence. Relating IMF predictions to melting/boiling-point datasets is the STS move - not boiling liquids on a stove.

Worked example

Hypothesis: H2O has stronger IMFs than H2S. Evidence: bp data card. Explanation: hydrogen bonding. Student: one more hydride pair from the card with CER.

Guided practice

1. CER for CH4 vs SiH4 from London forces using given bps.
2. Near-miss: iodine heating demo at home. Forbidden.

Independent practice

1. Second CER for HF vs HCl from the card.
2. Two sentences: NS2 evidence cycle.
3. Setting: dataset (CHEM20-LR-08-BPDATA).

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

Running a home boiling-point lab.

Safety and lab register

Setting: Dataset only. CHEM20-FORBID-FLAME. 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 IMF↔bp CER from the pack data card.

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

AI Tutor / human tutor

Ground on 20-A2.2sts. 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.