Canonical lesson CHEMISTRY20-U3-L01 · outcome 20-C1.1k · depth CURRICULUM_BASELINE

Unit C: Solutions, Acids, Bases and Equilibrium intro - outcome 20-C1.1k

• Course: CHEMISTRY20 (SCN2796)
• Lesson ID: CHEMISTRY20-U3-L01
• Official outcome: 20-C1.1k (KNOWLEDGE)
• Object type: canonical lesson (not a bootcamp session)
• Source: Alberta Chemistry 20 Program of Studies (2007, updated 2014)

Official outcome text

recall the categories of pure substances and mixtures and explain the nature of homogeneous mixtures

Learning intention

Meet 20-C1.1k 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

Pure substances: elements or compounds with fixed composition. Mixtures: variable composition. Homogeneous mixtures (solutions) are uniform at the macroscopic scale: one phase, solute dissolved in solvent. Heterogeneous mixtures show regions (sand in water, oil layers).

Worked example

Air is a homogeneous gaseous mixture. Brass is a homogeneous solid solution. Sugar water is aqueous homogeneous. Italian dressing that separates is heterogeneous.

Guided practice

1. Classify brass, oil-water layers, filtered air, and distilled water. Do not copy the teaching list unchanged.
2. Near-miss: calling NaCl(s) a mixture because it has two elements. Mark the first wrong line.

Independent practice

1. Homogeneous vs heterogeneous: fog vs salt water.
2. Two sentences: solution as a homogeneous mixture.
3. Is 18 K gold a solution? (yes - solid solution.)

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

Calling a suspension “a solution” because it looks clear for one second, or calling NaCl(s) a mixture.

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

Four labelled examples: element, compound, homogeneous mixture, heterogeneous mixture.

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

AI Tutor / human tutor

Ground on 20-C1.1k. 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.