Particle Thinking Showcase

Overview

Lesson 8 of 8 focuses on summative assessment and reflection. Students present their evaporation-prevention engineering solutions, using particle models to explain observable properties of solids, liquids and gases.

Learning intentions

• WALT: Reflect on what we have learned about states of matter using particle models.
• WALT: Explain how particle motion and arrangement relate to observable properties of solids, liquids and gases.
• WALT: Present a clear engineering solution to prevent evaporation, using scientific language.
• WALT: Critically evaluate evidence from investigations and discuss possible sources of error.

Success criteria

• I can classify substances as solids, liquids or gases and explain their observable properties using particle models.
• I can justify my evaporation-prevention technique using the motion/arrangement of particles.
• I can present findings clearly (what I changed, what I measured, and what happened), and compare my result with expectations.
• I can recognise at least one possible source of error or limitation and explain how it could be improved.

Curriculum links

• Explaining observable properties of solids, liquids and gases by modelling the motion and arrangement of particles.
• Planning and conducting repeatable investigations with fair-test thinking (used in reflections on their earlier method).
• Comparing methods and findings, recognising possible sources of error, and drawing reasoned conclusions.
• Investigating how scientific knowledge is used by individuals and communities to identify problems and make decisions (link to real-world evaporation control).
• Writing/creating texts to communicate ideas and findings for specific audiences (their project pitch/report and explanation).

Lesson structure (80 minutes)

1. 0–5 min · Welcome & goals. Teacher outlines the day’s expectations and reminds students this is a showcase and reflection task; students gather materials and review their presentation prompts.

2. 5–15 min · Model warm-up (quick checks). Teacher leads a rapid “particle sort” using three scenarios (solid, liquid, gas) and asks students to point to the matching particle model; students answer using “particles are…” statements and hold up the correct card.

3. 15–30 min · Presentation rehearsal. Teacher provides a short structure: (1) problem (2) idea (3) test evidence (4) particle explanation (5) decision/improvement; students practise with a partner and refine vocabulary (evaporation, temperature, gas, surface, particle movement).

4. 30–60 min · Summative presentations (stations). Teacher runs 3–4-minute rounds per group with quick questions; students present their evaporation-prevention devices, then do a 30-second “particle justification” and show their evidence data/notes.

5. 60–70 min · Practical demonstration check (mini-task). Teacher sets up a fast rotation: each group demonstrates one technique (or a version of it) and compares observations to what they predicted; students record one observation and link it to particles (e.g., fewer particles escaping = less evaporation).

6. 70–78 min · Critical reflection (written). Teacher provides a reflection sheet with sentence starters: “Our evidence suggests…”, “A possible source of error was…”, “A fairer test would…”, “Particles help explain because…”; students complete independently.

7. 78–80 min · Exit ticket collection. Teacher collects reflections and asks one final oral question: “Which state matters most in evaporation and why?”; students answer as they hand in.

Resources

• Students’ evaporation-prevention devices and design notes
• Particle model cards/posters (solids, liquids, gases; arranged motion diagrams)
• Data sheets from the investigation (or class results summary)
• Reflection worksheet with sentence starters
• Timer and station labels
• Safety glasses if any demonstrations involve liquids/knock-over risk
• Marking checklist/rubric for teacher (criteria-aligned)
• Audience question prompts (e.g., “What did you keep the same?” “How did you explain evaporation using particles?”)

Assessment

• Teacher observation checklist during presentations (uses success criteria language and particle-model explanations).
• Reflection sheet: evidence vs opinion, fair-test thinking, and at least one source of error/limitation.
• Optional quick oral probe during stations (e.g., “Where are the fastest particles in your explanation?”) to confirm understanding.

Differentiation

• Support for students needing scaffolding:
• Provide sentence starters for particle explanations and engineering steps.
• Offer a template for fair-test statements: “We changed…, measured…, kept…”.
• Allow students to use diagrams/labelled particle models instead of long verbal explanations.
• Support for EAL and students with limited scientific vocabulary:
• Word bank on cards: evaporation, particles, gas, liquid, surface, motion, arrangement, temperature, evidence.
• Permit rehearsing answers with a partner before presenting.
• Extension for students ready for challenge:
• Require an “improvement plan” that proposes a specific change to improve fairness (controlled variable) and predicts the effect using particles.
• Inclusion:
• Assign roles within groups (speaker, evidence presenter, particle explainer, question responder) so all students contribute meaningfully.

Extension (optional)

• For advanced learners, add a “critical comparison” question: compare two classmates’ techniques and argue which is likely to be most effective and why, using particle reasoning and evidence (not just opinions).