Young Explorers: Investigating Our World · 1st Class

Active learning ideas

Physical and Chemical Properties of Materials

Active learning helps young students connect abstract concepts like melting and freezing to their own experiences with everyday materials. When children handle ice, chocolate, or butter, they observe real changes and build mental models that last longer than words alone can provide.

• NCCA Curriculum Specifications
• NCCA: Junior Cycle Science - Chemical World
• NCCA: Junior Cycle Science - Properties of Materials

• 15–30 min
• Pairs → Whole Class
• 3 activities

Activity 01

• Inquiry Circle
• 30 min · Small Groups

Inquiry Circle: The Ice Cube Race

In small groups, students are given an ice cube and must find the fastest way to melt it without using a microwave. They can use their hands, the sun, or warm breath. They record the time and explain why their method worked.

Explain the difference between a physical property and a chemical property.

Facilitation Tip

During 'The Ice Cube Race', circulate with a timer and ask groups to predict how long their ice cube will last, then compare predictions to actual melting times.

What to look for

Present students with a collection of common objects (e.g., a wooden block, a metal spoon, a rubber ball, a piece of paper). Ask them to sort the objects into two groups: those with primarily observable physical properties and those where a chemical property might be more important. Prompt them with questions like, 'How does this object feel?' versus 'What happens if I try to burn this?'

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

Activity 02

• Think-Pair-Share
• 20 min · Pairs

Think-Pair-Share: Can We Fix It?

Show images of melted chocolate, a fried egg, and a frozen lolly. Students think about which ones can be turned back to how they were before. They discuss with a partner and then categorize them into 'reversible' and 'permanent' changes.

Identify various physical properties of common materials and their uses.

Facilitation Tip

In 'Can We Fix It?', pause after each example to ask, 'What clues tell us this change can or cannot be reversed?'

What to look for

Provide students with a worksheet containing two columns: 'Physical Property' and 'Chemical Property'. Ask them to list at least two examples of each property observed during the lesson or from their own experiences. Include a sentence explaining one example for each column.

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

Activity 03

• Simulation Game
• 15 min · Whole Class

Simulation Game: Particles on the Move

Students act as 'particles' in a material. When the teacher says 'Freezing', they huddle close and stay still. When the teacher says 'Heating', they start to wiggle and move apart. This physical model helps them visualize what is happening inside the material.

Analyze how chemical properties determine how a substance reacts with others.

Facilitation Tip

Use the 'Particles on the Move' simulation to stop the animation at key points and ask students to describe what they see in their own words.

What to look for

Hold a class discussion using the following prompts: 'Imagine you have a piece of wood and a piece of paper. What are some ways you can describe them using only their physical properties? What would happen if you tried to light them both on fire? How does this tell us about the difference between physical and chemical properties?'

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

A few notes on teaching this unit

Teach physical and chemical properties by starting with materials students already know, like ice and butter, before introducing unfamiliar examples. Avoid using the words 'cold' or 'hot' as things that move; instead, focus on energy transfer and particle movement. Research shows that young learners grasp these ideas better when they connect observations to their own actions and words.

Successful learning looks like students explaining how heat changes solids to liquids and back again using precise vocabulary. They should distinguish melting from dissolving and recognize that some changes cannot be undone, such as baking bread or frying an egg.

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Watch Out for These Misconceptions

• During 'The Ice Cube Race', watch for students saying sugar 'melts' in water.

  Set up a side-by-side comparison: melt chocolate with gentle heat to show true melting, and stir sugar into water to show dissolving. Ask, 'What do you see happening to the chocolate? What happens to the sugar? How are these different?'

• During 'Particles on the Move', watch for students describing cooling as 'cold moving in.',

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Methods used in this brief

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