Science (EVS K-5) · Class 3

Active learning ideas

Changes We See Around Us

Active learning helps students grasp physical and chemical changes by connecting abstract ideas to everyday experiences they already observe at home. When children manipulate real materials like ice, salt, or paper, they build mental models that last longer than textbook definitions alone.

• CBSE Learning Outcomes
• NCERT: Class 7, Chapter 6: Physical and Chemical Changes

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

Activity 01

• Stations Rotation
• 45 min · Small Groups

Stations Rotation: Change Stations

Prepare four stations: melting ice cubes in warm water, dissolving salt in water, tearing and folding paper, and supervised candle burning with adult help. Students predict the type of change, observe for five minutes, record if reversible, and rotate every 10 minutes. End with group sharing of findings.

What happens to butter or ice cream when you leave it near a warm stove?

Facilitation Tip

During Change Stations, set up identical stations so all groups work with the same materials to standardise observations.

What to look for

Show students pictures of different changes: melting ice, burning candle, tearing cloth, rusting nail, dissolving sugar. Ask them to hold up a green card for physical change and a red card for chemical change. Discuss any disagreements.

• Remember
• Understand
• Apply
• Analyze
• Self-Management
• Relationship Skills

Activity 02

• Experiential Learning
• 30 min · Pairs

Kitchen Changes Observation

In pairs, students watch melting ghee on a tawa, sugar dissolving in warm water, and milk curdling with vinegar. They draw before-and-after sketches and note if the change can reverse. Discuss as a class which are physical and which chemical.

How is tearing a piece of paper different from burning it?

Facilitation Tip

In Kitchen Changes Observation, ask students to predict outcomes before each step to make their curiosity explicit.

What to look for

Give each student a small slip of paper. Ask them to write down one example of a reversible change they saw today and one example of an irreversible change they saw today. Collect these as they leave.

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Activity 03

• Experiential Learning
• 25 min · Small Groups

Sorting Game: Reversible Changes

Provide cards with pictures of changes like folding cloth, rusting bicycle, evaporating water, burning matchstick. In small groups, sort into physical and chemical piles, justify choices, then verify with teacher-led demonstration.

Can you give two examples of changes you see happening in your kitchen every day?

Facilitation Tip

For Sorting Game, use real objects like peeled banana slices and burnt paper pieces to make reversibility concrete.

What to look for

Pose this question: 'Imagine you have a piece of bread. You can toast it, or you can tear it into small pieces. Which of these actions changes the bread into something new? How do you know?' Facilitate a class discussion comparing the two scenarios.

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

Activity 04

• Experiential Learning
• 20 min · Whole Class

Prediction Walk Around Class

Students walk around the classroom or school, noting changes like wet floor drying or chalk dust settling. Individually predict types, then share in whole class discussion with evidence from observations.

What happens to butter or ice cream when you leave it near a warm stove?

Facilitation Tip

During the Prediction Walk, ask students to sketch changes they predict before seeing them to build observation skills.

What to look for

Show students pictures of different changes: melting ice, burning candle, tearing cloth, rusting nail, dissolving sugar. Ask them to hold up a green card for physical change and a red card for chemical change. Discuss any disagreements.

• Apply
• Analyze
• Evaluate
• Self-Awareness
• Self-Management
• Social Awareness

A few notes on teaching this unit

Start with familiar examples from Indian homes to anchor new concepts. Use guided questions that push students to test their own ideas rather than confirm what you say. Avoid rushing to definitions—let evidence from experiments drive the learning. Research shows that when students articulate their predictions and then test them, misconceptions reduce significantly compared to passive listening.

By the end of these activities, students should confidently classify changes by testing reversibility and observing new substance formation. They should explain their reasoning using evidence from experiments, not just recall textbook phrases.

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Watch Out for These Misconceptions

• During Change Stations, watch for students who label melting chocolate as chemical because 'heat made it different' instead of noticing the taste and colour remain the same.

  Ask students to compare melted chocolate to burnt paper at the station: both involve heat, but only burning creates ash and smoke. Have them note differences in smell and taste after cooling.

• During Kitchen Changes Observation, watch for students who think dissolved salt in water has vanished forever like salt in fireworks.

  After dissolving salt, have students taste the water or let it evaporate on a plate to see salt crystals reappear. Ask them to explain why the salt is still there but not visible.

• During Sorting Game, watch for students who group tearing paper with burning paper because both seem 'gone forever'.

  Provide torn paper pieces and adhesive tape at the station. Ask students to rejoin the pieces and compare the taped paper to the burnt paper. Discuss why one can be reversed but the other cannot.

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Methods used in this brief

• Stations Rotation
• Experiential Learning