Matter Foundations

Overview

Students begin a three-lesson unit on exploring matter and its properties by defining matter and identifying common states using observable evidence. They will sort everyday items by observable properties and explain their reasoning.

Learning intentions

• WALT define matter as anything that has mass and takes up space.
• WALT describe the observable characteristics of solids, liquids, and gases at a basic level.
• WALT classify examples of matter using observable properties (such as shape, volume, and whether it can be compressed).
• WALT communicate scientific ideas using clear group discussion and evidence-based reasoning.

Success criteria

• I can explain what “matter” means and give examples from everyday life.
• I can identify at least three states of matter and relate them to observable features.
• I can correctly sort items into categories and justify my choices using observations.
• I can use simple scientific language (mass, volume, shape, state) to communicate my group’s conclusions.

Curriculum links

• Science learning area: investigating physical systems and materials through observation, modelling, and explanations.
• Key competencies: thinking (using evidence to classify), communicating (explaining ideas clearly), and participating and contributing (working in groups).
• NZ Curriculum emphasis: learning through hands-on investigations and discussing evidence to build understanding.

Lesson structure (90 minutes)

1. 0–10 min: Hook + posing questions Show a short set of “mystery” images or objects (e.g., ice cube, water in a container, air in a balloon, sugar, sand). Students quick-write: “What do these things have in common?” Share and cluster responses to introduce the unit question: “What is matter?”

2. 10–20 min: Mini-teach — definition and states Teacher models the core idea: matter has mass and takes up space. Use a simple, class-friendly visual/diagram of solids, liquids, and gases. Emphasise observable properties: shape (fixed vs not fixed), volume (fixed vs not fixed), and compressibility (qualitatively).

3. 20–45 min: Hands-on investigation — Matter sort In groups of 3–4, students receive item cards and materials (e.g., paper, metal spoon, eraser, sand, water sample, cooking oil, balloon with air, tissue, etc.). Students sort items into “matter categories” using a recording sheet with prompts:

• What did we observe?
• What properties did we use to sort?
• Which state(s) does it fit (solid/liquid/gas) and why? Teacher circulates to prompt evidence: “What did you see/hear/sense that supports your choice?”

4. 45–55 min: Whole-class sense-making Each group shares one sorting rule (for example: “fixed shape,” “pours,” “fills the space,” “can be squeezed/compressed”). Class co-constructs a comparison chart for states of matter based on observations (not memorised definitions only).

5. 55–70 min: Modelling activity — “Space and mass” thinking Groups perform a brief teacher-led demonstration: compare a solid and a liquid in identical containers (e.g., measure approximate volume with markings) and discuss mass qualitatively (heavier/lighter comparisons using balance where available). For gases, compress air in a syringe or squeeze a balloon (if equipment allows). Students record what changed and what stayed the same, linking to the idea that matter occupies space and has mass.

6. 70–85 min: Discussion and explanation writing Students draft a 6–8 sentence explanation: “Matter is… We know because… Solids/liquids/gases differ because we observe…” Encourage use of claim–evidence reasoning. Provide a sentence starter bank on the board.

7. 85–90 min: Exit ticket — demonstrate understanding Exit ticket (individual):

• Define matter in your own words.
• Give two examples of each state and one observable property that helps you decide. Collect for formative assessment before Lesson 2.

Resources

• A set of real items or safe substitutes (solid, liquid, gas demonstrations as appropriate)
• Item cards labelled with common examples (or blank cards for students to write examples)
• Sorting mats and a recording sheet (properties used, observations, state chosen)
• Containers for liquids and small scoops/utensils for solids
• Syringe (for compressing air) and/or balloon for gas demonstration
• Timer for group rotations/check-ins
• Balance (optional) for qualitative mass comparisons
• Marker pens, sticky notes for charting group ideas
• Sentence starters for the explanation writing task
• Exit ticket slips and pens

Assessment

• Formative assessment through teacher observation during the matter-sorting task (listening for evidence-based justifications).
• Formative assessment using the explanation draft (checking for accurate definition and use of observable properties).
• Summative-ready check via the exit ticket (definition, correct state examples, and at least one relevant observable property).

Differentiation

• Support: provide a property checklist (fixed shape, fixed volume, pours/flows, compressible) and a partially completed comparison chart for students who need scaffolding.
• Support: allow students to record observations using sentence starters and drawings alongside words.
• Extension: challenge groups to propose an additional observable test for sorting (e.g., “What experiment would you do to tell two unknown samples apart?”) and justify why it works.
• EAL/SEN: pre-teach key terms with visuals (mass, volume, state) and offer bilingual word banks if available; encourage use of gestures/diagrams before writing.