Materials for the youngest scientists: study cards a grown-up can read aloud, the tricky ones, a practice quiz at three levels — Foundation, On-Level, and Challenge — and a lab where you sort solids from liquids, sort the changes that come back from the ones that don't, label ice, water and steam with the heat and cold that move them, and argue whether a melted crayon is still a crayon. Work here, or print it and use a crayon — both count.
A bar of chocolate. Hard, in one piece, its own shape.
Test it, then ask whether it comes back. Melting and freezing come back — the stuff is the same, just a new shape. Cooking and burning do not. A new shape is not a new material.
Two things people get wrong
⚠️People often think…
Sand is a liquid, because you can pour it.
Pouring is not the test — shape is. Every single grain of sand keeps its own hard shape. A liquid takes the shape of its container; the grains never do.
Shape is the test, not pouring.
⚠️People often think…
Melted chocolate poured into a mold is a new material.
Taste it — still chocolate. Only the shape changed, and cooling it brings the hard bar right back. A change you can undo did not make anything new.
A new shape is not a new material.
Comes back, or does not
1Watch one
Ice melts into water. Is that a new material?
Ask what it was: water, frozen hard.
Ask what it is now: water, as a liquid.
Now the real test — put it back in the freezer. Does it come back?
It does. Same water the whole time, just colder or warmer. ✓
2Do one with me
Fill in what changed and whether it comes back.
Melted chocolate cooled down comes back as
A cooked egg cooled down is still
Ice, water and steam are all the same
💬One sentence, then you move on
How can you tell a change comes back?
3Try one
You take a block tower apart. How many blocks do you have now?
I want a hint first
Nothing fell out of the world. Whatever went into the tower comes back out of it.
Where this goes
Where this lives
Cooking, freezing leftovers, picking a raincoat over a paper one, knowing that a melted crayon is still a crayon.
What this feeds
That closes the K–2 science band. Everything here comes back in third grade with measurements attached.
Name one change you have seen that could not be undone.
One card at a time — tap “Show me” to check yourself, then Next. Start at Foundation; when those feel easy, climb.
Helpful Hints
🪜 Materials — the ladder
A material is what a thing is made of → a solid keeps its shape, a liquid takes the shape of its container → every material has properties: hard, bendy, shiny, soaks up water, sticks to a magnet → pick the material whose properties fit the job → small pieces build big things and can be built again → heat and cold change things: melt and freeze come back, cook and burn don’t.
Shape, properties, pieces, heat and cold.
🤝 The whole idea
Everything around you is made of some material, and every material can be tested. Bend it, wet it, heat it, cool it — and ask one question: can I get the old thing back?
Test it. Then ask if it comes back.
⚠️ Tricky ones
Sand pours, but it is NOT a liquid — every grain is a tiny solid. Shape is the test, not pouring.
Melted chocolate in a new shape is STILL chocolate. A new shape is not a new material.
Ice, water and steam are all the same water — just hotter or colder.
Cooling a cooked egg does NOT make it raw. Some changes never come back.
Take a tower apart and you still have every block. Nothing is lost.
🔁 Comes back, or doesn’t? — the chart
The change
What you did
Can you get the old thing back?
ice → water
heated it
yes — freeze it
water → ice
cooled it
yes — melt it
butter or crayon melts
heated it
yes — cool it and it hardens
water → steam
heated it a lot
yes — it turns back to drops on something cold
egg → cooked egg
cooked it
no — never raw again
bread → toast
heated it
no — it stays toast
paper → ash
burned it
no — it is gone
Melt and freeze come back. Cook and burn don’t.
🎯 How the test will ask
Pictures of a rock, milk, a block, juice — “circle the solids.”
“Which material would you pick for a raincoat, and why?”
A picture of ice, water and steam with arrows — “what makes each change?” (heat or cold).
“A cake is baked. Can it change back? Why not?”
“The same blocks make a tower and then a house. What changed?”
✅ Can you…
Tell a solid from a liquid, and say the test?
Name four properties you can test?
Pick the right material for a job and say why?
Say what heat does to ice and what cold does to water?
Name two changes that come back and two that don’t?
Pick your level
Look back at anything you missed — the hint that appeared is exactly what to reread tonight.
How sure did you feel?
Lab
Work like a scientist: label the diagrams, turn the table into a graph, then write a claim with evidence and reasoning. Every lab checks itself on the spot, and hints are free.
Your practice never leaves this device. There is no account and no sign-in. Your work is saved in this browser only, and you can erase it whenever you want.
Your practice record — saved on this device
This is your record of the module on screen — it stays here and goes nowhere. Independent means you got it right on the first tap; supported means you got it after the explain-and-retry, or marked ‘I had it’ on a revealed answer. Both count, and neither is a grade. If your teacher asks, copy the row or show them this screen.
Date
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Topic
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Level
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Independent
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Supported
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Hints used
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Cards studied
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Lab
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Traps met
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Explained in own words
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Confidence
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The answer key is for a teacher: it prints only from here, for the unit on screen. Print the study packet prints the study pages and a blank quiz — never the answers.