Canonical lesson CHEMISTRY20-U3-L02 · outcome 20-C1.2k · depth CURRICULUM_BASELINE

Unit C: Solutions, Acids, Bases and Equilibrium intro - outcome 20-C1.2k

• Course: CHEMISTRY20 (SCN2796)
• Lesson ID: CHEMISTRY20-U3-L02
• Official outcome: 20-C1.2k (KNOWLEDGE)
• Object type: canonical lesson (not a bootcamp session)
• Source: Alberta Chemistry 20 Program of Studies (2007, updated 2014)

Official outcome text

provide examples from living and nonliving systems that illustrate how dissolving substances in water is often a prerequisite for chemical change

Learning intention

Meet 20-C1.2k 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

Many reactions in living systems and in water treatment happen in solution: ions and molecules must be mobile to collide. Solid NaCl does not react like NaCl(aq). Dissolving is often a prerequisite, not the reaction itself.

Worked example

Stomach acid (aqueous HCl) reacting with carbonate; plant nutrients taken up as aqueous ions; a water-treatment flocculant dissolving before it can bind particles. Project link: a hygiene salt only acts in water after it dissolves.

Guided practice

1. Explain why solid baking soda on a dry counter does not fizz until aqueous acid is present (given classroom demo or description - no home acid experiments).
2. Near-miss: mixing bleach and vinegar to “show dissolving.” Forbidden - mark it.

Independent practice

1. Aqueous ions in plant nutrient uptake (qualitative, no invented FNMI story).
2. Two sentences: dissolving as a prerequisite vs the later chemical change.
3. Project link: a hygiene salt acts after it dissolves - one sentence.

Diagram / whiteboard

Approved diagram id chem20-ph-scale - pH scale / solution concentration axes. 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

Saying dissolving is always a chemical change, or that dry crystals undergo the same aqueous neutralization.

Safety and lab register

Setting: concentration and pH on paper or school-prepared dilute solutions. Red-cabbage indicator is classroom-supervised or photo/dataset. No concentrated acids or bases. No tasting. Dilution math is not a licence to mix cleaners. Forbidden: bleach+acid, drain opener, battery acid, undiluted pool chemicals. AI Tutor must not invent titrations or acid labs outside the register.

Alberta Poison Control if a real exposure is occurring: 1-844-764-7669. The AI Tutor is not a poison centre.

Formative evidence

One living and one nonliving example from the worked set, restated in your words.

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

AI Tutor / human tutor

Ground on 20-C1.2k. 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.