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Science Lesson Kit · Teacher Resource

Particles Too Small to See — 5E Lesson Plan

Physical Science · 55 minutes

Grade 5

5E lesson flow

  1. 01

    Engage

    7 min

    Teacher Does

    Inflate a balloon or bag and ask what was added.

    Students Do

    Observe the change and propose claims.

    Ask

    • What changed?
    • What does that tell us about air?

    Look For

    Air occupies space.

  2. 02

    Explore

    16 min

    Teacher Does

    Guide observations of air inflation and a dissolving example.

    Students Do

    Record before/after observations and measurements.

    Ask

    • What can we detect even if we cannot see separate particles?

    Look For

    Observable effects or measurements.

  3. 03

    Explain

    11 min

    Teacher Does

    Introduce a particle model and state its limits.

    Students Do

    Draw particle symbols and explain what they represent.

    Ask

    • What do the dots represent?
    • What do they not show exactly?

    Look For

    Representation, not literal photographs.

  4. 04

    Elaborate

    14 min

    Teacher Does

    Give new evidence scenarios.

    Students Do

    Use claim-evidence-model reasoning.

    Ask

    • Which observation supports your model?

    Look For

    Evidence linked to model features.

  5. 05

    Evaluate

    7 min

    Teacher Does

    Ask for one complete invisible-matter explanation.

    Students Do

    Produce a short written or diagram explanation.

    Ask

    • How do you know the matter is still there?

    Look For

    Evidence plus a model without unsupported atomic detail.

Student goal

I can use evidence and a model to explain matter that is too small to see directly.

Learning objectives

  • Use observations and measurements as evidence that unseen matter is still present.
  • Develop particle models for air compression, dissolving, and evaporation.
  • Explain that model dots are simplified representations rather than exact photographs.

Materials

  • Balloons or sealable bags
  • Hand pump optional
  • Clear cups
  • Water
  • Salt or sugar
  • Balance if available
  • Particle-model sheet

Before class

  • Prepare an air-inflation demonstration.
  • Pretest any mass comparison.
  • Do not use tasting as evidence.
  • Keep explanations at the Grade 5 particle-model level.
  • Open Teach Mode.

Prior knowledge

  • Matter can be solid, liquid, or gas.
  • Observations and measurements can be evidence.

Vocabulary

matter
Anything that takes up space and has mass.
particle
A very small piece used in a model of matter.
model
A representation used to explain or predict a system.
gas
A state of matter that spreads to fill available space.
dissolve
To mix into a liquid so the material is no longer visible as separate pieces.
evidence
Observations or measurements used to support a claim.
compress
To push matter into less space.

Differentiation

  • Provide a claim-evidence-model organizer.
  • Allow students to annotate a provided model before drawing their own.
  • For extension, compare two models and decide which better explains the evidence.

Assessment

  • Check whether models show matter continuing to exist.
  • Look for evidence-based reasoning.
  • Check that dots are treated as representations.

Exit ticket

Explain how a balloon gives evidence for matter we cannot see directly, then add a simple particle model.

Extension

Connect later to conservation of matter, where measurements provide additional evidence during changes.