Skill: write-like-james @ 264fe96 · the build: write-lesson, write-mcqs, write-video-script @ 264fe96

Topic 21 "Heating and cooling" — your read (28 September 2026, night)

Seven lessons in the Matter strand, after solids, liquids and gases: melting, freezing, evaporation, where the water went, boiling, condensation, and "same water, different state". One lot of water followed all the way round: it is always water, only its state changes. Read by the author as you, then a non-author review (31 findings, all adjudicated and applied), then a cold read of every changed item (36 of 36 keys agreed). Reply by number.

The three that unblock the bank

1. Does Topic 21 stay one topic of seven lessons, or split into two? The architecture named a split: "Melting and freezing" (two lessons) against "Evaporating, boiling and condensing" (five). But the seventh atom — ice, water and water vapor are the same stuff — needs melting, freezing AND evaporation behind it, so it cannot sit in either half; a 2 + 5 cut leaves a two-lesson topic with no capstone and a five-lesson topic whose last lesson restates the first two. Your cluster ruling allows up to seven when a capstone closes them, and L07 is that capstone. The cost: about seven bank items per atom, and a type sheet at the ten-type ceiling. The reviewer agrees. Nothing after Topic 19 is authored, so a split later is cheap: the lesson files do not change, only the two topic modules and type sheets. The build record's decision card Keep one topic / split as 2 + 5

2. Does L07 coin "state"? Topic 20 sorts by "kind" (solid, liquid, gas). L07 says the plain words first — "Solid, liquid or gas — which one a thing is, we call its state" — and one typed term item tests it. The atom's own title says "different state", and every grade-4 and grade-5 item will say it. The reviewer agrees. L07 Coin it / keep "kind"

3. Do the ten question types stand, with the typed hard tier? Ten is the ceiling, and the sheet says so: seven atoms each need a type alone, and the pairs need three more; one type (the word for the change, typed) tests five atoms alone by its instances. Your night ruling is applied: the hard tier is typed — the word for a change described only by what is seen ("Beads of water form on a cold metal railing" → condensation), and the boiling water's reading off the long-tube thermometer with Topic 17's magnified strip (212 °F, numeric). Easy and medium are four-option MCQs. After the review, every exemplar is a fresh scene — a chocolate coin on a windowsill, a bag of frozen peas, hail on a trampoline, rain on a park slide, an outdoor hot tub, the inside of a tent — with a design-move inventory on the sheet showing every lesson-side instance beside it. The ten types, eleven exemplars, coverage and inventory Approve all / strike these / edit these

Three smaller calls, one line each

4. May L02 say melted butter "freezes, even in a fridge"? Freezing is a liquid turning solid when it cools enough — the butter case stops it settling as "very cold", and a bridging line meets the child's word ("At home you might say the butter went hard. Scientists say it froze…"). The reviewer agrees. Keep / drop the butter case

5. May L04 draw the water's tiny pieces in the AIR above a plain-blue puddle? Topic 20 draws air's pieces and no liquid's pieces; L04 draws only the pieces that have left the puddle, with the caption clause "The puddle's own pieces are too close together to draw here." Yes / words only

6. Is the long-tube thermometer acceptable as Topic 17's thermometer drawn to 220 °F? Same card, same routine (a number every 10, a mark every 2), now paired with Topic 17's magnified 200–220 strip because 212 sits one 4-pixel mark above 210 on the tube alone. 32 °F stays on Topic 17's own card. Yes / say 212 °F in words only

The lessons

7. L01 Melting — Juniper's ice pop on the bench in the sun; a solid warms up enough and turns into a liquid; an ice cube in Aled's hand, butter in a hot pan, chocolate in a hot pocket; then a metal spoon in the same sun: warm, still a solid — "a metal spoon melts too, but only in a roaring furnace". Quiz: a snowman, a rock, a crayon on a hot dashboard, a fork in hot soup; Kester's sugar "melted" in cold water (no). Article · script · quiz Fine / say where

8. L02 Freezing — Tamar's ice-cube tray in the freezer; the water gives some of its energy to the cold air and cools down; at 32 °F (0 °C on the other side) it turns into a solid; juice in a pop mold, a puddle on a cold night, melted butter in the fridge; a glass of water in the same fridge stays a liquid (about 40 °F). Nye says the cold went into the water (no). Article · quiz Fine / say where

9. L03 Evaporation — the playground puddle: big in the morning, smaller by lunch, dry next day; bit by bit the water goes into the air; a wet T-shirt, a saucer over five days, wet hair; the same saucer with a lid keeps its water; the sunny puddle dries first. Every line says where the water went; nothing "disappears". Article · quiz Fine / say where

10. L04 Where the water went — Cosmo says the water is gone into nothing. Air is made of tiny pieces too small to see; water is too; the pieces leave the puddle's top and spread through the air like any gas: water vapor. "It is water in the air. It has not turned into air." You can feel it on a muggy day. Article · quiz Fine / say where

11. L05 Boiling — Pippa's dad's pasta pan, forgotten; the thermometer climbs to 212 °F and bubbles form all through: boiling; the water turns into water vapor fast and the pan boils dry. The white cloud above the pan is tiny drops you CAN see; the clear gap just above the water is water vapor, which you cannot. "Steam" is never said. A two-row table: evaporating (slow, no bubbles, any warmth) against boiling (fast, all through, 212 °F only). Article · quiz Fine / say where

12. L06 Condensation — Florrie's cold can of orange soda sweats clear drops: the can is sealed, so the water came from outside — water vapor in the air touched the cold can, cooled down and turned back into liquid water. A cold window, the bathroom mirror, Keir's glasses; a can at room warmth gets no drops. Merritt says the soda leaked through (no). Article · quiz Fine / say where

13. L07 Same water, different state — Zosia's melted ice cube; Bertie says it is "melted ice, a different stuff". Frozen again, evaporated, condensed: the three-state ring; ice, water and water vapor are the same stuff (the same matter); "state" coined; a sealed bag of ice reads 200 g before and after it melts. Article · quiz Fine / say where

Applied without asking

Hard bank items typed; every attached question stands alone with its own drawing; no option bundles a verdict with a reason; every stem a positive question; hard means more of the skill; colour, photos for real things, cartoons for hands and people, no drawn people; "heat" never a noun; nothing disappears, escapes or leaks — every line says where the water went; "stuff" beside "matter"; no "density"; Fahrenheit first with Celsius as the other side, every reading on a mark and checked by code and by the cold reader; the misconception catalogue's rows each met once in a lesson and once in a claim item; the summary's three questions and the practice set re-instanced on fresh scenes after the review; the provisional mass atom (the 200 g bag) stays one example in L07 and is logged as the seed of the grade-5 conservation atoms in ATOM_PROPOSALS_G3T21.md, with four register notes for your word.

Also on the site

Intro and poll · summary and three questions · mixed practice · the blueprint's decisions

After you answer

1 → the architecture row stands or the topic renumbers as 21A / 21B. 2 → the L07 lines and the term item stand or change to "kind". 3 → a bank of about fifty from the approved types, a second cold read, the hand-over folder for David. 4–6 → the lines and drawings stand or change. Register notes → the knowledge-graph repo.