Young Explorers: Investigating Our World · 1st Class

Active learning ideas

States of Matter: Solids, Liquids, Gases

Active learning helps young students grasp states of matter because concrete, hands-on experiences build durable understanding better than abstract explanations. When pupils manipulate objects and observe changes directly, they connect properties to real-world examples they already know.

• NCCA Curriculum Specifications
• NCCA: Primary - Materials
• NCCA: Primary - Materials and Change

• 20–45 min
• Pairs → Whole Class
• 4 activities

Activity 01

• Concept Mapping
• 30 min · Small Groups

Sorting Stations: Matter Hunt

Prepare trays with solids (blocks, erasers), liquids (water, oil), and gases (balloons, bubbles). In small groups, pupils sort items into labelled sections, test properties like pouring or squeezing, and discuss findings on charts. Conclude with a class share-out.

Differentiate between the characteristics of a solid, a liquid, and a gas.

Facilitation Tip

During Sorting Stations, place a timer nearby so students feel urgency and focus on explaining their choices as they move between stations.

What to look for

Provide students with a tray of various classroom objects (e.g., a block, a bottle of water, an inflated balloon). Ask them to sort the items into three groups: solids, liquids, and gases, and explain their reasoning for one item in each group.

• Understand
• Analyze
• Create
• Self-Awareness
• Self-Management

Activity 02

• Concept Mapping
• 45 min · Whole Class

Demonstration: Ice to Water

Place ice cubes in clear containers and observe over time as they melt into liquid. Pupils predict changes, measure water levels before and after, and draw particle models showing the shift. Extend by freezing water again to show reversibility.

Analyze everyday examples of each state of matter.

Facilitation Tip

When demonstrating Ice to Water, use a clear container and let students feel the temperature shift to connect sensory experience with visual change.

What to look for

Ask students: 'Imagine you have a cup of water. What happens if you pour it into a bowl? What happens if you put the water in a bag and leave it outside on a very cold day?' Guide them to discuss the changes in shape and state.

• Understand
• Analyze
• Create
• Self-Awareness
• Self-Management

Activity 03

• Concept Mapping
• 20 min · Pairs

Particle Modelling: Ball Shake

Give pairs pipe cleaners or beads to represent particles. For solids, pack tightly and shake minimally; for liquids, link loosely and pour; for gases, spread out and blow apart. Pupils sketch their models and explain differences.

Construct a simple model to represent the particles in each state of matter.

Facilitation Tip

For Particle Modelling, remind students to hold the container still after shaking to observe how the balls settle differently from solids.

What to look for

Give each student a card with a picture of an everyday item (e.g., a rock, milk, steam from a kettle). Ask them to write down which state of matter it is and one characteristic that helped them decide.

• Understand
• Analyze
• Create
• Self-Awareness
• Self-Management

Activity 04

• Concept Mapping
• 25 min · Small Groups

Gas Exploration: Balloon Squeeze

Inflate balloons partially and have pupils squeeze to feel gas resistance. Compare to squeezing solids and liquids in bags. Groups record observations and infer gas properties like expansion.

Differentiate between the characteristics of a solid, a liquid, and a gas.

Facilitation Tip

In Gas Exploration, ask students to predict and then recount what happened when they squeezed the balloon to emphasize cause and effect.

What to look for

Provide students with a tray of various classroom objects (e.g., a block, a bottle of water, an inflated balloon). Ask them to sort the items into three groups: solids, liquids, and gases, and explain their reasoning for one item in each group.

• Understand
• Analyze
• Create
• Self-Awareness
• Self-Management

A few notes on teaching this unit

Teach states of matter through repeated cycles of observation, prediction, and explanation. Avoid rushing to definitions; instead, let students articulate their own ideas first and then refine them with guided questions. Research shows that students learn best when they test predictions and discuss unexpected outcomes, so plan time for reflection after each activity.

By the end of these activities, students should confidently sort common items into solids, liquids, or gases and describe at least one property for each. They should also explain that matter changes state without disappearing, using evidence from their own tests.

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Watch Out for These Misconceptions

• During Sorting Stations, watch for students labeling all liquids as 'wet and cold.'

  Bring safe liquids of different temperatures and viscosities to the station, like cooking oil or syrup. Ask pupils to pour and describe each one, then compare their observations to their original ideas.

• During Gas Exploration, watch for students saying gases are not real because they cannot be seen.

  Set up a simple balance scale and have students predict whether an inflated balloon weighs more than an empty one. Let them test and discuss the results to prove gases have mass.

• During Ice to Water, watch for students thinking the ice disappears when it melts.

  Measure the mass of ice before melting and after, then ask students to explain why the mass stays the same. Use the same water in a different container to show volume can change without losing matter.

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Methods used in this brief

• Concept Mapping