Topic 5 — Pure substances and mixtures — blueprint for James

What I need from you: 4 decisions

Teach "pure substance" before "mixture", with the particle picture, as the register orders them?

MAT-027 (pure substance: one kind of matter) comes before MAT-028 (mixture: more than one). Each is a yes/no sort, so each gets an example sequence and a fluency quiz.

the particle picture makes the sort visible: one kind of particle in the box, or two kinds mingled. That picture is the same one Topic 7 will reuse for elements and compounds.

My recommendation: yes, in that order, with the two-kinds-of-particle drawing from L01. Agree / change.

Draw the second kind of particle as an open circle, as Topics 1 and 2 already do?

the register draws sugar among water and perfume among air as dark and open circles. Mixtures here need the same convention, and Topic 7 will need a third kind (a compound's joined pair).

the alternative is size, which reads as "big and small particles" and plants a wrong idea.

My recommendation: open circle for the second kind, never size. Agree / other.

Use "evenly mixed" and "not evenly mixed" in plain words before coining homogeneous and heterogeneous?

L04 coins both Greek terms. The plain words carry the idea; the terms are what the tests use.

My recommendation: plain words first in every line, the terms coined once each and then used with the plain words beside them for the rest of the topic. Agree / change.

Which lessons could do without a video?

L01 and L02 are sorts by example sequence; L04 is a sort; L05 is a decision tree walked on cases. L03 (separating a mixture: each part keeps its properties) has something moving — iron filings lifting out of sand.

My recommendation: mark L01, L02, L04 and L05 "could do without a video"; all five scripted. Agree / change.

Topic 5 at a glance — 5 lessons

	Lesson	Opens on	Format
L01	One kind of matter: a pure substance	A student has a glass of distilled water and a glass of orange juice.	article only
L02	More than one kind: a mixture	A student pours salt into a bowl of sand and stirs.	article only
L03	A mixture can be taken apart	A student spills iron filings into a tray of sand.	video + article
L04	Evenly mixed or not: homogeneous and heterogeneous	A student stirs a spoon of salt into a glass of water until it disappears.	article only
L05	Sort any sample: the decision tree	A student is handed four cups with no labels: distilled water, salt water, sandy water, and a cup of copper coins.	article only

What this topic is, in five lines

Five lessons, one per atom: MAT-027, 028, 029, 030, 032.

Terms coined here: pure substance (L01), mixture (L02), homogeneous and heterogeneous (L04).

Deliberately not taught: elements and compounds (Topic 7), solutions by name (Topic 6, where "solution" is coined), separation techniques by name (Topic 6).

One kind of matter: a pure substance L01

A student has a glass of distilled water and a glass of orange juice.

She lets both stand for an hour.

The water looks the same all the way through, and always will.

The juice settles, with pulp at the bottom and thin juice at the top.

What is different about the water?

The point, stated first

What makes a sample one single kind of matter?

Zoom in on the distilled water: every particle is a water particle, and nothing else.

A sample that contains only one kind of matter is called a pure substance.

Zoom in on the juice: water particles, sugar particles, pulp, and more, all mingled.

The juice is not a pure substance.

Video: nothing a page cannot show — article only.

Part 1 — MAT-027 — Identify which samples are pure substances based on whether they contain only one kind of matter; coin pure substance

Check: example sequence, each case shown as a particle box: pure (distilled water) → pure (a copper wire) → not pure (juice) → pure (table sugar) → not pure (sea water) → rule; fluency quiz: pure substance or not, 8 fresh cases, each drawn as a box or described

Figure: SVG: two particle boxes — one kind of particle only; two kinds mingled (dark and open circles, kinds never touching)

Leans on: T1 L02 (particles) — one recall question

Part 1q — Fluency quiz: pure substance

Check: fluency

Figure: —

Leans on: —

More than one kind: a mixture L02

A student pours salt into a bowl of sand and stirs.

The bowl now holds one grey-white heap.

It looks like one material.

Under a magnifying glass, she can still see clear salt grains and darker sand grains side by side.

Is the heap one kind of matter, or two?

The point, stated first

What do you call a sample with more than one kind of matter in it?

The heap holds salt grains and sand grains, mingled but each still itself.

A sample that contains two or more substances mingled together is called a mixture.

The salt is still salt, and the sand is still sand.

Stirring does not turn two substances into one.

Video: nothing a page cannot show — article only.

Part 1 — MAT-028 — Classify a sample as a pure substance or a mixture based on whether it contains more than one substance; coin mixture

Check: example sequence: mixture (salt and sand) → mixture (trail mix) → pure substance (distilled water) → mixture (air: several gases) → pure substance (pure gold) → rule; fluency quiz: pure substance or mixture, 8 fresh cases; misconception item: a student says stirring salt into sand makes a new substance — the key corrects: each keeps its own particles

Figure: SVG: the salt-and-sand heap as a particle box with two kinds mingled; a licensed photo of a trail mix if one is found

Leans on: L01 (pure substance) — one recall question; MAT4-020 retrieved

Part 1q — Fluency quiz: mixture

Check: fluency

Figure: —

Leans on: —

A mixture can be taken apart L03

A student spills iron filings into a tray of sand.

Picking them out one by one would take all day.

She holds a magnet just above the tray.

The filings jump up onto the magnet; the sand stays in the tray.

Why could the magnet pull one part out and leave the other?

The point, stated first

Why can the parts of a mixture be separated?

In a mixture, each substance keeps its own properties.

Iron is still magnetic in the mixture; sand is still not.

The magnet uses that difference and lifts only the iron.

Because each part keeps its own properties, the parts of a mixture can be separated.

Video: the filings lifting out while the sand stays — video and article.

Part 1 — MAT-029 — State that the components of a mixture can be separated because each keeps its own properties

Check: what (salt water left in the sun: the water evaporates; what is left) → why (free response: why can the salt be recovered) → misconception item: a student says the salt and water became one new substance — the key corrects: each kept its properties → transfer (sand and gravel shaken through a sieve)

Figure: SVG: the tray, the magnet, the filings on the magnet, the sand below; table: three mixtures and the property difference that lets each be separated

Leans on: L02 (mixture) — one recall question; MAT4-021 retrieved

Notes

Scope: separation techniques are NAMED only where the scene names them (magnet, sieve, evaporating); choosing a technique is Topic 6 (MAT-041).

Evenly mixed or not: homogeneous and heterogeneous L04

A student stirs a spoon of salt into a glass of water until it disappears.

She stirs a spoon of sand into a second glass.

Both are mixtures.

The salt water looks the same everywhere in the glass.

The sandy water has sand at the bottom and clear water on top.

Are these two mixtures the same kind of mixture?

The point, stated first

Are all mixtures mixed the same way?

In the salt water the salt particles are spread evenly through the water; every sip is the same.

A mixture that is the same all the way through is called homogeneous (evenly mixed).

In the sandy water the sand sits in one place and the water in another.

A mixture that is different in different places is called heterogeneous (not evenly mixed).

Video: nothing a page cannot show — article only.

Part 1 — MAT-030 — Classify a mixture as homogeneous or heterogeneous based on whether it is uniform throughout; coin homogeneous, heterogeneous

Check: example sequence with particle boxes: evenly mixed (salt water) → not evenly (sandy water) → evenly (air) → not evenly (trail mix) → evenly (brass) → rule; fluency quiz: homogeneous or heterogeneous, 8 fresh cases; misconception item: a student says a heterogeneous mixture is not a real mixture — the key corrects: both are mixtures

Figure: SVG: two particle boxes — two kinds spread evenly; two kinds in separate regions; table of the five cases with the plain words and the terms

Leans on: L02 (mixture) — one recall question; MAT4-022 retrieved

Part 1q — Fluency quiz: homogeneous / heterogeneous

Check: fluency

Figure: —

Leans on: —

Sort any sample: the decision tree L05

A student is handed four cups with no labels: distilled water, salt water, sandy water, and a cup of copper coins.

She must sort each into a category from this topic.

She has two questions to ask about each cup.

Which questions, and in which order?

The point, stated first

How do you sort any sample into one of three categories?

First question: is there more than one kind of matter?

No: it is a pure substance.

Yes: it is a mixture, so ask the second question.

Second question: is the mixture the same all the way through?

If yes, the mixture is homogeneous.

If no, the mixture is heterogeneous.

Video: nothing a page cannot show — article only; the tree is a drawing.

Part 1 — MAT-032 — Follow the classification decision tree to place any described sample into the correct category

Check: scaffolded (type b): worked walk of the tree on one case → step items on a fresh case (question 1; question 2; category) → fluency quiz: pure substance / homogeneous mixture / heterogeneous mixture, 8 fresh described samples

Figure: SVG: the decision tree — two question diamonds, three category boxes, each category with its particle box

Leans on: L01, L02, L04 — one recall question each

Topic close

Mixed mastery practice: 10–12 items; the four coined terms by typed recall; two full tree sorts as free response ("Sort this sample and say which question decided it"); fresh instances.

Then the PP100: 20 four-option MCQs on fresh instances, tagged easy / medium / hard by depth of reasoning, at least one item per atom.

The course architecture (14 topics) — open only if you want the whole map

Skill: course-build → atomise (architecture, step 6b gate) → write-like-james @ 4c9e849

MS Chemistry — course architecture v1 (for James's approval, 25 September 2026)

Read this in five minutes. It decides the topics, their order, where every PP100 sits, and which topic pilots first. Nothing below writes a lesson sentence. The atom register stays where it is: the Matter strand of the Science Knowledge Graph (92 atoms, JM-reviewed). This document arranges those 92 atoms into a course and stops.

The takeaways

Fourteen topics, one PP100 at the end of each, 92 lessons in all. One atom, one lesson. Topics run 4 to 12 atoms; the average is 6 or 7.
The order follows the big ideas, not the TEKS list: what matter is and how particles explain it → what properties tell you → sorting matter into kinds → inside the atom and the periodic table → how matter changes → two grade-8 applications (water, acids and bases).
Topic 1 is the pilot: "Particles and the three states of matter", 12 lessons. It stresses every treatment the course will need — a two-part test taught by examples, a fact, two "explain the smell" mechanisms, three example-sequence classifications, three particle-picture why-lessons, one coined term with a ranking routine. Its blueprint is the second deliverable.
Density is its own topic. It carries the course's first two calculation routines, so it gets its own practice set and PP100 (vault ruling: a quantitative subtopic becomes its own topic).
Three checkpoint tests, at the three natural seams, anchored to the released grade-8 STAAR, Florida SSA and AZSCI forms. Grade-level slices remain derivable from the TEKS stamps if operations later want them.
Five prerequisites live in other strands and are not taught here. Each lesson that leans on one states it in a sentence and asks one recall question. Nothing is assumed (stand-alone entry rule).
Seven register observations for your atomisation pass. No atom was edited; the register is read-mostly.

Status (25 September, later the same day): you approved Topic 1 as the pilot and clarified delivery (video or article per atom, then questions). Card 5 records that. The ask now: approve or edit the Topic 1 blueprint (course_preview/review/BLUEPRINT_T01.html); lesson writing starts on your word.

Card 1 — The topics

The call: fourteen topics in the order below, a mixed mastery practice set then a PP100 at the end of every one.

#	Topic (student-facing title)	Atoms	Lessons	TEKS stamp	The big idea it serves
1	Particles and the three states of matter	MAT-001, 002, 003, 004, 016, 016b, 017, 017b, 018, 018b, 019, 019b	12	6.6A	Everything is made of moving particles; that explains solids, liquids and gases
2	Changing state	MAT-020, 021, 022, 023, 024, 025, 026, 026b	8	6.6A (NGSS MS-PS1-4)	Heating and cooling change how particles move, not what they are; mass holds
3	Physical properties	MAT-005, 006, 007, 012, 013	5	6.6D	Properties you can measure without changing the substance
4	Density	MAT-008, 009, 010, 011, 015	5	6.6D	A property that identifies a substance whatever the sample size
5	Pure substances and mixtures	MAT-027, 028, 029, 030, 032	5	6.6B	Sorting matter by how many kinds it contains
6	Solutions and separating mixtures	MAT-033, 034, 035, 036, 037, 038, 039, 040, 041	9	7.6D, 7.6E, pre-6.6B	A mixture keeps its parts' properties, so you can pull it apart
7	Atoms, elements, molecules and compounds	MAT-042, 042b, 043, 044, 045, 046, 047, 048	8	7.6A	One kind of atom or more than one: the particle-level sort
8	Inside the atom	MAT-049, 050, 051, 051b, 052	5	(NGSS MS-PS1-1; FL SC.8.P.8.7)	Protons decide which element an atom is
9	The periodic table	MAT-053, 054, 054b, 055, 056, 057, 058	7	6.6C	The table arranges elements so position predicts properties
10	Chemical formulas	MAT-059, 059b, 060, 061	4	7.6B	A formula counts atoms; change the count and you change the substance
11	Physical and chemical change	MAT-062, 063, 064, 064b, 065, 065b	6	7.6C	Did a new substance form? The one test, and its evidence
12	Chemical reactions and conservation of mass	MAT-066, 067, 068, 069, 069b, 070, 071, 072	8	8.6E, 8.6B	Reactions rearrange atoms; none appear or vanish, so mass holds
13	Water's special properties	MAT-073, 074, 075, 076	4	8.6C	Water particles pull on each other and on other surfaces
14	Acids and bases	MAT-077, 078, 079, 080, 081, 082	6	8.6D	Two families of substance, one scale, and what happens when they meet

Totals: 92 lessons, 14 practice sets, 14 PP100s (280 items), 3 checkpoint tests. Two atoms may need a second lesson once blueprinted — MAT-010 (calculate density) and MAT-061 (coefficients and parentheses) — so plan for 92 to 94.

Why this grouping

Every prerequisite edge in the register points backwards in this order. Checked atom by atom; no forward reference.
Sub-domains 2 and 3 were each split in two (Topics 3/4 and 1/2). SD-3 has 16 atoms; a 20-item PP100 over 16 atoms certifies nothing. SD-2 bundles a calculation routine with observational properties.
Topics 5 to 7 form one sort of matter in three passes: by how many substances (5), by whether it is a solution (6), by what the particles are (7). The full classification tree (MAT-047) closes Topic 7.
Topics 13 and 14 sit last. Nothing depends on them, they are the register's only pure grade-8 applications, and the checkpoint before them then covers a clean block.

What changes: the course folder gets one topicNN_build/ folder per topic; Topic 1's blueprint is written; nothing else is authored until you approve it.

Card 2 — Topic 1 is the pilot, at 12 lessons

The call: pilot "Particles and the three states of matter" end to end — 12 lessons, quiz after each, mixed practice, PP100 — before any other topic starts.

Why

The vertical-slice rule asks for a routine, a categorical concept and an explanation in the pilot. Topic 1 has all three: three example-sequence classifications (solid, liquid, gas), three why-lessons on the particle picture, a ranking routine that coins the course's first technical term, and a transformation (heating speeds particles).
It is the course's foundation. Every later topic reuses its one particle picture and its four sentences about arrangement and movement.
SD-1 alone (4 atoms) would pilot fast but would not test a PP100 worth the name, and has no routine.

The alternative is a 10/10 cut: move the two kinetic-energy atoms (MAT-019, 019b) to the front of Topic 2, where kinetic energy is the lever for melting. I kept them in Topic 1 because TEKS 6.6A names kinetic energy in the states comparison, and the ranking closes the three-box picture.

What changes: the Topic 1 blueprint is the next thing you read.

Card 3 — Density stands alone

The call: Topic 4 "Density" (5 atoms) is separate from Topic 3 "Physical properties" (5 atoms).

Why

Density carries two routines (displacement volume, MAT-008; calculate density, MAT-010) plus the sink-or-float prediction and the "same whatever the sample size" fact.
Vault ruling (AP Biology, 10 Sep 2026): a topic test that mixes a calculation routine with a content topic hides which one failed.
Solubility (MAT-012) and conductors (MAT-013) stay in Topic 3 as properties; Topic 6 retrieves solubility with a recall question.

What changes: two PP100s where the register had one sub-domain.

Card 4 — Checkpoints at three seams

The call: three static checkpoint tests, each with some free response, at the ends of Topics 6, 10 and 14; the third doubles as the end-of-course test and is anchored to released grade-8 STAAR, Florida SSA and AZSCI items.

Why

The seams are natural: Topics 1–6 are matter you can see and handle; 7–10 are the atom and its table; 11–14 are change and two applications.
No state tests middle-school science before grade 8, so there is no per-grade instrument to anchor to (HANDOFF recommendation 1). The TEKS stamps (6.x/7.x/8.x on every atom) still allow a grade-level slice later without re-atomising.
Five interchangeable forms per test is the standing ruling for topic tests; whether checkpoints also get five forms is your call.

What changes: nothing yet. Checkpoints are built after the topics they cover.

Card 5 — Delivery: video or article per atom, quiz straight after

The call: every lesson (one per atom) ships as BOTH a 40–90 second video and a short article, and the student chooses which to take; the quiz follows in the app, never inside the video. At topic end: mixed mastery practice (any format, key terms by recall), then the PP100 (20 MCQs, easy/medium/hard). No topic intro or summary videos.

Why

Your format ladder of 25 September, with your clarification the same day: each atom is a video with the option to read the article instead. The platform's learner's-choice mode carries exactly that.
When video and text are alternatives, each must teach the whole part (vault rule), so the video script (write-video-script) and the article (write-lesson) are written from the same blueprint row and reviewed against each other.
Pitched one notch up from the Grade 3 Forces pack: no title slide, open on the first example, rule stated last, everything appears on the word that names it. Middle school may carry a short "why" where Grade 3 stayed qualitative.
The ladder names no intro or summary video. AP Biology and HS Chemistry ran different intro policies; I have not inherited either.

Skills that run per lesson, in order: write-lesson (dispatching by lesson type) for the article → write-video-script for the video → design-check-sequence then write-mcqs for the quiz → review-accuracy (a reader who did not write it, against the reference) → review-figures on every rendered figure → review-lesson (blind key read, guidance read, adjudication) → blind review of every key before anything ships.

Figures: the blueprint names the figure kind per part. Particle pictures are always monochrome SVG drawings, one depiction reused everywhere. Real scenes a student should recognise (a tea bag colouring water, sand pouring into a jar) are licensed stock photos where the photo carries the point; a drawing where the point is a measurement or a label.

What changes: the blueprint carries a delivery line and an SVG-or-photo call on every figure.

Card 6 — Five prerequisites are taught in other strands

The call: the five cross-strand prerequisites below are not taught in MS Chemistry. Each lesson that leans on one states the fact in one sentence and asks one recall question before using it.

External atom	What it says	Leaned on by
ENE-020	Temperature measures average particle motion	MAT-004 (Topic 1)
ENE-021	Heat flows from hot to cold	MAT-020–023 (Topic 2)
ENE-025	Thermal conductors and insulators	MAT-013 (Topic 3)
FOR-017	Spot a magnetic force	MAT-041 (Topic 6)
LIF-073	The photosynthesis word equation	MAT-072 (Topic 12)

Why

Stand-alone entry rule: no student has taken the 3–5 courses or the sibling MS courses, so every lesson stands alone.
One loop to know about: ENE-020 (Energy) lists MAT-002 and MAT-003 as its prerequisites, and MAT-004 lists ENE-020. Inside this course MAT-004 carries the "hotter means faster particles" idea itself; the Energy course will meet it as retrieval.

What changes: the blueprint's "leans on" column names the external atom wherever it applies.

Card 7 — Register observations, no edits made

The call: seven observations for your atomisation pass. I changed nothing in the register.

MAT-013 sorts materials as thermal and electrical conductors — two property families in one behaviour (the "and" audit). Candidate split.
MAT-022 "Evaporation and boiling" — evaporation happens at the surface below the boiling point; boiling happens throughout at one temperature. Two predictions, one atom. Candidate split.
MAT-050 states the charge and location of three particles — six facts in one contrast frame. HS Chemistry kept a similar profile atom whole as an argued exception; flagging for the same argument here.
MAT-061 counts atoms with "a coefficient, parentheses, or both" — two routines, likely two lessons.
MAT-019b may not fail independently of MAT-019 in practice. Kept as its own lesson; the data decides (guide: never pre-emptively merge).
MAT-004 → MAT-016/017/018. Identifying a solid from its behaviour does not need "heating speeds particles". The edge is honoured in the order, but it looks like a sequencing edge rather than a knowledge one.
MAT-042 has no in-strand prerequisite and enters via MAT5-084 only; Topic 7 must open with the particle picture from Topic 1 as its retrieval.

What changes: nothing until you rule. Atom edits happen in the knowledge-graph repo with a log entry.

About this build (kickoff record)

Register: Science Knowledge Graph/data/atoms/06-08/matter.json, pulled 25 September 2026, 92 atoms in 13 sub-domains. Per-course choices are the register's: K-8 IDs with letter suffixes; Fact / Categorical / Transformation / Routine; bare behaviours; verdict/reason split by default.
Endpoint: grade-8 STAAR, Florida SSA and AZSCI physical-science items; NGSS MS-PS1-1/2/4/5.
Sources read: knowledge-graph HANDOFF and CLAUDE; vault CLAUDE, 00 Protocol, the PP100 and build-process-v2 rulings, the blueprint rule; the Grade 3 Forces feedback log; the chemistry misconception research (particle model area). HS Chemistry Unit 1 was opened before this document was written; under your same-day correction it is reference only, and Topic 1's scenes were chosen fresh.
Coverage check (standards mapped onto this architecture, never the other way): every Matter atom sits in exactly one topic; every TEKS 6.6/7.6/8.6 knowledge code in the register appears in at least one topic. Blank cells in the register (e.g. NGSS on solutions, TEKS on atomic structure) are register findings, not gaps in this course.

What happens next

You approve or edit the topic table. Then you read the Topic 1 blueprint. Only after that does write-lesson run on Topic 1, one lesson at a time, starting with the first of each lesson type as its exemplar.