LUNDY LOOP Space → Voice → Audience → Influence
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Biology · Respiration · Practical science

Mission: Can Your Breath Change the Evidence?

Predict · shape the method · test · improve · explain

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Learning objectives

  • Use limewater safely to test for carbon dioxide
  • Compare how my breath affects limewater at rest and after activity
  • Explain the results using respiration

Success criteria

  • I follow all 3 safety rules with no reminders
  • I record and compare two cloudiness scores: rest and active
  • I can finish the sentence: "More cloudy means…"
🦉 Mission: Everyone starts with the same investigation. Your response—not a label—decides whether your next move is Build, Grow or Launch.
🌟 Aspire: Link your result to respiration, evaluate the method, and help improve the investigation for the next class.
Arrival · Recall

Quick recap — limewater & CO₂

Two you already know from before. Tap your answer — we confirm together, then print for your file.

Stuck? Think back to Friday — you made the limewater. What was it for?
Starter · Hook

Your breath is full of clues

The air you breathe IN is about 0.04% carbon dioxide.

The air you breathe OUT is about 4% carbon dioxide.

That's roughly 100× more CO₂ coming out than going in. Your body is making it.

Predict: After 90 seconds of activity, do you predict that your breath will make limewater more cloudy, less cloudy, or show no clear change? Turn and tell your partner why.
Activity makes muscles work harder, increasing respiration and carbon dioxide production. Our prediction is that, using the same breathing routine, more CO₂ may reach the limewater after activity. We will test the prediction and treat any different result as useful evidence.
📝 Capture predictions (tap each pupil's guess — it prints on their sheet)
Lundy Loop · Shape the investigation

Your voice changes what happens next

🟪SPACE
safe ways to contribute
🗣️VOICE
say, point, type or ask a TA
👂AUDIENCE
teacher and class listen
🔧INFLUENCE
we change the method

Question 1 — What must we keep the same to make our comparison fair?

Question 2 — What support would help everyone take part safely?

I Do · Quick lead-in

You know this test — here's the safe way to do it

Recap: you did the limewater test in gas-tests week, and you made this limewater on Friday. So the test itself is old news. Only two new things today: (1) do it safely with a straw, and (2) use a shared 1–5 observation scale.
The danger: sucking the limewater up the straw. Limewater is an irritant. We only ever blow OUT.

🥽 Rule 1 — Goggles ON

Splash protection. On before you touch a beaker.

💨 Rule 2 — BLOW, never suck

Gentle out-breaths, like blowing out candles. If you feel like breathing in — take the straw out of your mouth first.

🧍 Rule 3 — Your straw, your beaker

No sharing. Wash hands after. Tell me instantly if any gets in your mouth or eyes.

Quick reminder — cloudy is the endpoint

CO₂ + limewater → the liquid goes cloudy / milky. Cloudiness shows that carbon dioxide has reacted with the limewater.

How we measure — the fair test: everyone follows the same counted gentle-breath routine (I'll count us in). Then rate your beaker on the cloudiness scale, 1–5, using the reference strip. A higher score suggests more CO₂ reached and reacted with the limewater during our routine.
Same beaker, same amount of limewater each time (3 cm deep, never more than half full — gentle breaths so it doesn't froth over). View it the same way every time so the comparison is fair.
1 Clear
2
3
4
5 Milky

👀 The trick: rate by how much you can see through the beaker. 1 = read text straight through · 3 = fuzzy · 5 = can't see through. Everyone uses the same rule, so our scores match.

Adaptive Hinge · everybody thinks

Which claim is scientifically safest?

Think alone, then tap 1, 2 or 3 (or say, point, sign or ask an adult to carry your answer). Your choice will highlight before the reveal.

Best claim: 2. Our scale is an observation, not an exact gas sensor. Unexpected evidence stays—we explain possible reasons.
We Do · Together

Reading 1 — at REST: first attempt

ATTEMPT 1
Carry out the agreed routine.
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FEEDBACK FEEDS FORWARD
Your class change improves Attempt 2.
  1. Goggles on. Limewater exactly 3 cm deep in your REST beaker. Straw in that beaker only.
  2. On my count, everyone follows the same counted gentle-breath routine together — then straws out, hands still.
  3. Look through your beaker (same amount, same way each time) and rate it 1–5 against the strip. That's your rest score.
1 Clear
2
3
4
5 Milky

👀 Judge it by how much you can see through the beaker: 1 = read text straight through · 3 = text looks fuzzy · 5 = can't see through at all. Use your desk card.

Write your rest score on your card: "At rest my cloudiness was ____ / 5."
Watch for: we all blow the same number of breaths — that's what makes it a fair comparison. Don't sneak extra puffs!

🔁 Micro-loop before Reading 2

Voice: What needs changing so the next trial is safer, clearer or fairer?

No change chosen yet — listen first.
Get Active · Reading 2

Reading 2 — improved attempt 🦉

⏱ Speed matters: the moment you sit back down, blow into your ACTIVE beaker immediately — before your breathing calms down. Don't chat first!
  1. Leave goggles on. Line up calmly at the door.
  2. 90-second activity chosen for you: standing movement, seated movement, or a scientific support role. Nobody has to run.
  3. Walk straight back, sit, and blow the same number of breaths into your ACTIVE beaker. Rate it 1–5 straight away.
🏃 Active testerComplete suitable movement, then test.
🪑 Seated testerUse safe seated movement, then test.
🔢 Breath counterCount the agreed breaths clearly.
👀 Method checkerCheck 3 cm depth, timing and viewing.
1 Clear
2
3
4
5 Milky

👀 Same rule: 1 = see straight through · 5 = can't see through. Rate against your desk card before your breathing settles.

1:30
Add to your card: "After exercise my cloudiness was ____ / 5."
🌟 Finished? Whisper a prediction: will the class average be higher or lower after exercise?
Class Breath Lab · Analyse

Put every score on the wall

Every score goes on the wall — then we look for the pattern together.

🐍 Choose your challenge: BUILD—point to the higher bar and complete “This suggests…” · GROW—link the pattern to respiration · LAUNCH—evaluate validity and propose a tighter control.
1 Clear
2
3
4
5 Milky
Rest cloudinessAfter-exercise cloudiness
Scientific caution: our score is an observation, not a direct CO₂ concentration measurement. Even with the same number of breaths, breath volume, bubble size, timing and judgement can differ. We will say “more CO₂ reached the limewater during our test”, not claim that we measured an exact percentage.
Exit Ticket

Show what you know — your response sets the next step

BUILDidentify evidence and use key vocabulary
GROWexplain the causal chain
LAUNCHevaluate and improve validity

🎯 Back to our objectives — did we meet them?

  • Use limewater safely — goggles on, blow not suck, our 3 rules
  • Measure CO₂ at rest & after exercise — your two cloudiness scores
  • Explain it with respiration — more movement → more CO₂

👍 Thumbs up if you can now do each one.

Foundation: Ade's limewater was cloudiness 2 / 5 at rest, but 5 / 5 after exercise (same number of breaths each time). Which reading had more CO₂? Tick one: ▢ rest ▢ after exercise.
Middle: Explain, using the word respiration, why Ade's beaker was cloudier after exercise.
Higher: Write the word equation for respiration, then explain why exercise increases the CO₂ in exhaled breath. Why did we keep the number of breaths the same each time?
Exam tip: name the gas (carbon dioxide) and the process (respiration) to secure both marks.
Sentence stem: "A higher cloudiness score means there was ____ carbon dioxide in my breath, because exercise increases ____."
🗣️ Say the conclusion, then close the loop (say it aloud at your level — we confirm the model together)
🟩 BUILD — say it aloud, then tap to confirm
After exercise my limewater was cloudier, so my breath had more carbon dioxide.
🟧 GROW — say it aloud, then tap to confirm
Exercise makes my muscles respire faster. Respiration makes carbon dioxide, so there was more CO₂ in my breath after exercise — the limewater went cloudier.
🟦 LAUNCH — say it aloud, then tap to confirm
glucose + oxygen → carbon dioxide + water. Exercise raises the rate of respiration, releasing more energy and more CO₂, so each breath out carries more carbon dioxide and the limewater turns cloudier. An odd reading can happen if the breaths weren't counted equally, the beaker wasn't viewed the same way, or breathing had already settled.

🟡 Yellow Box — live next step (tap to push a pupil up a level)

🔁 Feedback loop no loops opened yet
Use the policy codes live. Mark I or WS, give one precise NS, then VF. Add R only after the pupil responds and an adult genuinely receives that response (Audience).
📷 Snap each pupil’s beakers / result on their row (📷 button) — it prints on their evidence sheet.
Practical family: most loops are watched re-attempts—capture only when the evidence already has value.
I Independent WS Worked with support VF Verbal feedback NS Specific next step E Evidence on EFL R Response received / loop closed // Self-edit ? Read this back to me

🔁 Close the Lundy Loop — improve this for the next class

Every pupil can say, point, type or ask an adult to communicate one view.

🖨 End-of-lesson book evidence

Creates one separate evidence sheet per pupil, each beginning on a new page. The sheet includes their prediction, results, practical evidence, question level, own-colour response space, I / WS · VF · NS+ · // / ? · R · E, response modality, Audience and the Influence on next learning.

Before printing: use the final capture rows above. Add R only after the pupil responded and an adult received the response. In “Influence”, record the real next move, for example: “Next lesson: revisit control variables” or “Next question moved to GROW”. Blank placeholder pupils are excluded from the batch.
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🌿 Calm mode — animations & sounds paused

🎉 Lesson complete!

You tested your own breath and explained it with science.

Don't forget to print your evidence pack.