Canonical lesson CHEMISTRY20-U4-L18 · outcome 20-D2.1sts · depth CURRICULUM_BASELINE

Unit D: Quantitative Relationships in Chemical Changes - outcome 20-D2.1sts

• Course: CHEMISTRY20 (SCN2796)
• Lesson ID: CHEMISTRY20-U4-L18
• Official outcome: 20-D2.1sts (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 may lead to the development of new technologies, and new technologies may lead to or facilitate scientific discovery (ST4) [ICT F2-4.4] • describe how industries apply principles of stoichiometry to minimize waste and maximize yield

Learning intention

Meet 20-D2.1sts 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

Industries use stoichiometry to raise yield and cut waste (ST4). Describe the principle; no plant design claim.

Worked example

Example: limiting reagent chosen so expensive reactant is nearly consumed; recycle excess when safe. Student: one paragraph on waste minimization with a given fertilizer or combustion card.

Guided practice

1. Identify limiting reagent on an industry card and the wasted excess.
2. Near-miss: inventing emission numbers. Use the card.

Independent practice

1. Paragraph: stoichiometry → less waste.
2. Two sentences: technology enabled by better yield accounting.
3. Limitation: side reactions, purity.

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

Claiming 100% yield is always achievable.

Safety and lab register

Setting: Paper. 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

Waste-minimization paragraph from pack card.

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

AI Tutor / human tutor

Ground on 20-D2.1sts. 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.