Matter Properties Lab

Overview

Students explore how substances show characteristic properties by testing density, solubility, electrical conductivity, and magnetism. They use evidence from practical work to classify materials and correct common misconceptions about “identifying” substances by appearance alone.

Learning intentions

• Students will investigate how different substances behave when tested for density, solubility, conductivity, and magnetism.
• Students will record qualitative and quantitative observations accurately, using tables and clear measurement.
• Students will use evidence to justify classification of unknown materials based on tested properties.
• Students will reflect on and address misconceptions about identifying substances by colour or shape.

Success criteria

• I can describe what my tested property shows (e.g., “soluble” vs “insoluble”) using correct scientific language.
• I can measure and record relevant data (mass, volume, observations) in a way others can understand.
• I can compare results across stations and explain how evidence supports a classification.
• I can identify at least one misconception and explain why appearance is not reliable for identification.

Curriculum links

• NCEA science learning expectations: practical investigation skills, using evidence to explain patterns, and communicating findings clearly.
• The New Zealand Curriculum refresh focus on scientific inquiry: planning, carrying out investigations, interpreting results, and using models and evidence.
• Key ideas about matter: properties can be observed and used to describe, classify, and predict behaviour in contexts.

Lesson structure (90 minutes)

1. 0–5 min: Welcome and unit link

• Briefly recap what “matter” is and the idea that substances have observable properties. Share the day’s stations and the goal: classification using evidence.

2. 5–15 min: Safety, equipment, and station expectations

• Teach key lab routines: safe handling of liquids, careful measuring, and respectful material disposal. Introduce the “evidence rule”: decisions must be based on test results, not colour or texture.

3. 15–35 min: Station 1 – Density testing

• Students measure mass and determine volume (e.g., using displacement or a provided volume method), then calculate density or record density categories if simplified for the station.
• They record results in a class table: substance name/ID, mass, volume, and density value (or range), plus a short observation of how the sample behaved.

4. 35–50 min: Station 2 – Solubility testing

• Students add fixed amounts of substance to water (or another solvent if provided), mix for a set time, and observe dissolution and any leftover material.
• They record “dissolves fully / partially / not dissolves”, plus any changes (clarity, sediment).

5. 50–65 min: Station 3 – Conductivity testing

• Students test conductivity using a simple circuit tester or conductivity setup with provided solutions/materials where appropriate.
• They record a clear outcome (conducts / does not conduct) and a note on bubbles/heat or observable reaction if present.

6. 65–80 min: Station 4 – Magnetism testing

• Students test each sample for attraction to a magnet, noting strength (weak/strong) and whether attraction changes after multiple tries.
• They record “attracted / not attracted” and any additional observations.

7. 80–90 min: Evidence-based classification and misconception check

• In pairs, students complete a short classification task: “Based on your station evidence, which properties best explain Material A/B/C?” They must include at least two property results.
• Quick whole-class discussion: revisit the misconception that “looking” identifies substances; emphasise that substances are identified by patterns of properties.

Resources

• Four station trays with labelled equipment:
• Density materials (measuring scales, measuring cylinders or displacement setup, beakers, sample IDs)
• Solubility materials (water/solvent, measuring spoons or graduated cylinders, stirrers, waste containers)
• Conductivity materials (simple circuit tester/battery pack, leads, beakers with designated test samples/solutions, safety wipes)
• Magnetism materials (magnets, sample holders, observation cards)
• Student recording sheets or lab book templates with:
• Data tables for each station
• Space for a final “classification justification”
• PPE: safety glasses and lab aprons/coats where available
• Timer for station rotations
• Teacher observation checklist (evidence and recording accuracy)
• Waste disposal supplies (labelled bins for solids, paper towels, spill control kit)
• Example of a correctly completed data table (one per group or projected)

Assessment

• Formative: teacher circulates with a checklist focusing on accurate recording (units, clear outcomes, measurements) and appropriate use of evidence.
• Formative: pair classification justification—students must reference at least two tested properties and explain the reasoning.
• Diagnostic: misconception check in the final 10 minutes—students state why appearance alone is unreliable.

Differentiation

• Support:
• Provide sentence starters for recording (e.g., “This substance is soluble because…”, “It does/does not conduct electricity when…”).
• Offer a partially completed template with units and prompts for measurements.
• Allow a “density category” option if calculating is too challenging for some students, while still requiring evidence-based classification.
• Extension:
• Challenge students to compare “same solubility, different conductivity” or “similar appearance, different density” and propose a likely set of properties for an unknown.
• Ask them to refine their classification using any discrepancies (e.g., “Why might two trials differ?”).
• EAL/SEN:
• Use visuals/icons on station cards for outcomes (dissolves/not, conducts/not, attracted/not).
• Offer reduced reading load while keeping the scientific reasoning demands (e.g., fewer words, same data quality).
• Grouping:
• Assign roles (measurer, recorder, materials manager, safety monitor) so each student contributes to evidence collection.