Canonical lesson CHEMISTRY20-U4-L09 · outcome 20-D1.3s · depth CURRICULUM_BASELINE

Unit D: Quantitative Relationships in Chemical Changes - outcome 20-D1.3s

• Course: CHEMISTRY20 (SCN2796)
• Lesson ID: CHEMISTRY20-U4-L09
• Official outcome: 20-D1.3s (SKILL)
• Object type: canonical lesson (not a bootcamp session)
• Source: Alberta Chemistry 20 Program of Studies (2007, updated 2014)

Official outcome text

analyze data and apply mathematical and conceptual models to develop and assess possible solutions • interpret stoichiometric ratios from chemical reaction equations (AI-ST3) • perform calculations to determine theoretical yields (AI-NS3) [ICT C6-4.1] • use appropriate SI notation, fundamental and derived units and significant digits when performing stoichiometric calculations (AI-NS3, CT-ST2)

Learning intention

Meet 20-D1.3s 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

Analyze: mole ratios → theoretical yields; SI units and significant digits.

Worked example

From 2 H2 + O2 → 2 H2O, compute grams water from a new given mass of H2; show unit cancellation.

Guided practice

1. One gravimetric and one solution stoichiometry item from the bank.
2. Near-miss: gas-law P in a mass-mass problem without need. Wrong-unit if forced.

Independent practice

1. Sig-fig justified answer.
2. Ratio from coefficients highlighted.
3. Excess reagent stated or “excess” given.

Diagram / whiteboard

Approved diagram id chem20-stoich-mole-map - Mole map stoichiometry flow. 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

Skipping the mole step.

Safety and lab register

Setting: Paper calculations. 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

Two fully worked stoichiometric calculations.

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

AI Tutor / human tutor

Ground on 20-D1.3s. 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.