Science · Year 5

Active learning ideas

Properties of Gases

Active learning works well for properties of gases because students often hold misconceptions about particle behavior and separation methods. Hands-on investigation lets them directly test ideas like compressibility and particle spacing, making abstract concepts concrete through observation and discussion.

• ACARA Content Descriptions
• AC9S5U04

• 25–60 min
• Pairs → Whole Class
• 3 activities

Activity 01

• Inquiry Circle
• 60 min · Small Groups

Inquiry Circle: The Great Separation Challenge

Groups are given a container of 'mess' (sand, salt, iron filings, and marbles). They must design and execute a 4-step plan to separate every component, using tools like magnets, sieves, water, and filter paper.

Analyze why a gas expands to fill any container it is in.

Facilitation Tip

During The Great Separation Challenge, circulate to ask guiding questions like, 'Which property makes decanting possible here?' rather than giving answers.

What to look for

Present students with three sealed containers: one with a solid, one with a liquid, and one with a gas (e.g., an inflated balloon). Ask: 'Which container shows a substance with indefinite shape and volume? Explain your reasoning using particle behavior.'

• Analyze
• Evaluate
• Create
• Self-Management
• Self-Awareness

Activity 02

• Simulation Game
• 50 min · Small Groups

Simulation Game: Water Treatment Plant

Students act as engineers to clean 'dirty' water (water with soil, twigs, and 'pollutants'). They use station rotations to decant, filter through sand/cotton, and discuss how to evaporate the remaining salt, recording the clarity at each stage.

Compare the spacing and movement of particles in a gas to those in a liquid.

Facilitation Tip

In the Water Treatment Plant simulation, assign roles so every student engages with the process, such as testing samples or adjusting filtration stages.

What to look for

On a slip of paper, ask students to draw a simple diagram comparing particle spacing and movement in a gas versus a liquid. Below their diagrams, they should write one sentence explaining why a gas is compressible.

• Apply
• Analyze
• Evaluate
• Create
• Social Awareness
• Decision-Making

Activity 03

• Think-Pair-Share
• 25 min · Pairs

Think-Pair-Share: Indigenous Yandying

Students watch a video of 'yandying' (winnowing). They discuss in pairs which physical properties (weight, shape, wind resistance) are being used to separate the seeds, then compare it to modern industrial sieving.

Predict how increasing pressure affects the volume of a gas.

Facilitation Tip

For the Think-Pair-Share on Indigenous Yandying, provide labeled containers of different grain sizes to help students visualize how traditional methods rely on density and size.

What to look for

Pose this question: 'Imagine you have a syringe with a stopper. If you push the plunger in, what happens to the air inside? Why? What would happen if you tried to do the same with water in the syringe?' Guide students to discuss compressibility and particle spacing.

• Understand
• Apply
• Analyze
• Self-Awareness
• Relationship Skills

A few notes on teaching this unit

Teach properties of gases by starting with observable behaviors like compression and expansion before moving to particle models. Avoid overwhelming students with theory early; instead, let them experience the properties firsthand and then build explanations together. Research shows that students grasp particle spacing more easily when they manipulate syringes or balloons before drawing diagrams.

Successful learning looks like students using physical properties to design separation plans, explaining why certain methods work for specific mixtures, and connecting particle behavior to real-world applications such as water treatment or recycling processes.

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Watch Out for These Misconceptions

• During The Great Separation Challenge, watch for students who believe filtering salt water will remove the salt.

  Ask students to test their filtered salt water by tasting it or using a conductivity meter, then guide them to reflect on why the salt wasn’t removed and what method would work instead.

• During The Great Separation Challenge, watch for students who think there is only one correct order for separating mixtures.

  Have groups present their separation plans side by side and facilitate a peer discussion comparing efficiency, cost, and practicality, highlighting that multiple logical paths can exist.

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Methods used in this brief

• Inquiry Circle
• Simulation Game
• Think-Pair-Share