Physical and Chemical Properties

Active learning helps students grasp physical and chemical properties because these concepts are abstract until they see, touch, and manipulate materials. When students test substances at stations, predict outcomes in experiments, and sort examples as a class, they build concrete evidence to support their understanding of matter and its behaviors.

• Primary 6
• Science
• 4 activities
• 15 min–45 min

Learning Objectives

1. Classify substances based on their observable physical properties, such as color, state, and solubility.
2. Differentiate between physical and chemical changes by identifying whether a new substance is formed.
3. Explain the conditions under which a chemical reaction occurs, citing evidence like gas production or color change.
4. Analyze experimental results to determine if a change observed was physical or chemical.

Stations Rotation

⏱ 45 min·Small Groups

Stations Rotation: Property Testing Stations

Prepare stations for physical properties (magnet test, density sink/float) and chemical changes (baking soda-vinegar reaction, steel wool rusting). Groups rotate every 10 minutes, record observations, and classify changes. Debrief as a class to sort examples.

Prepare & details

Differentiate between physical and chemical properties with examples.

Facilitation Tip: During Property Testing Stations, set clear timers so students focus on one test at a time and rotate only when directed.

Setup: Tables/desks arranged in 4-6 distinct stations around room

Materials: Station instruction cards, Different materials per station, Rotation timer

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

Think-Pair-Share

⏱ 30 min·Pairs

Dissolving Challenge: Pairs Experiment

Pairs test sugar, salt, and sand in water, stir, filter, and evaporate to recover substances. They note solubility and reversibility, then explain why dissolving sugar is physical. Share findings on a class chart.

Prepare & details

Analyze how a chemical change results in the formation of new substances.

Facilitation Tip: For the Dissolving Challenge, remind pairs to record both what they observe and what they think happened before discussing conclusions.

Setup: Standard classroom seating; students turn to a neighbor

Materials: Discussion prompt (projected or printed), Optional: recording sheet for pairs

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

Think-Pair-Share

⏱ 20 min·Whole Class

Change Sort: Whole Class Card Activity

Distribute cards with scenarios (e.g., cutting paper, cooking egg). Class discusses and sorts into physical/chemical columns on the board, justifying with property evidence. Vote on tricky cases.

Prepare & details

Explain why dissolving sugar in water is a physical change, not a chemical one.

Facilitation Tip: In Change Sort, model one example card aloud to show how to use the category criteria before letting students work in groups.

Setup: Standard classroom seating; students turn to a neighbor

Materials: Discussion prompt (projected or printed), Optional: recording sheet for pairs

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

Think-Pair-Share

⏱ 15 min·Individual

Observation Log: Individual Home Link

Students log a physical change at home (e.g., ice melting) and hypothesize a chemical one (e.g., milk souring), then verify in next lesson. Share one entry per student.

Prepare & details

Differentiate between physical and chemical properties with examples.

Setup: Standard classroom seating; students turn to a neighbor

Materials: Discussion prompt (projected or printed), Optional: recording sheet for pairs

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

Teaching This Topic

Teach this topic by starting with familiar objects and building up to abstract ideas gradually, using hands-on activities first. Avoid rushing to definitions—instead, let students propose rules based on their observations, then refine their language with teacher guidance. Research shows that concrete experiences before abstract explanations lead to deeper and longer-lasting understanding in primary science.

What to Expect

Successful learning looks like students confidently distinguishing physical changes from chemical changes in new situations, using evidence from their observations. They should explain their reasoning clearly, support claims with data from experiments, and apply these ideas to everyday examples without prompting.

Watch Out for These Misconceptions

Common Misconception

During the Dissolving Challenge, watch for students who assume dissolving always creates a new substance because the mixture looks different.

What to Teach Instead

During the Dissolving Challenge, have students filter the sugar solution through coffee filters and then evaporate the water to recover sugar crystals, allowing them to taste and observe that the sugar remains unchanged and recoverable.

Common Misconception

During Property Testing Stations, watch for students who label any color change as evidence of a chemical reaction.

What to Teach Instead

During Property Testing Stations, include a station with food coloring in water and iodine on starch paper so students see color shifts without new substances forming, then discuss how to tell the difference.

Common Misconception

During Change Sort, watch for students who assume all irreversible changes are chemical.

Assessment Ideas

Quick Check

After Station Rotation, present students with a list of changes including water boiling, iron rusting, paper tearing, and baking soda reacting with vinegar. Ask them to label each as either a 'physical change' or a 'chemical change' and briefly explain their reasoning for two of the examples.

Exit Ticket

After the Dissolving Challenge, give each student a small sample of a common substance such as salt, sugar, or chalk. Ask them to list two observable physical properties of the sample, then predict what might happen if they tried to dissolve it in water and whether this would be a physical or chemical change, justifying their answer.

Discussion Prompt

During Change Sort, pose the question: 'Imagine you are a chef trying to make crispy fried potatoes. What physical properties of the potato are important for frying? What chemical changes happen during frying that make the potatoes crispy and brown?' Facilitate a class discussion where students share their ideas and justify their answers using evidence from the activity.

Extensions & Scaffolding

• Challenge: Ask students to design their own test for a substance’s solubility or reactivity using only classroom materials, then predict whether the change would be physical or chemical before testing.
• Scaffolding: Provide sentence stems or word banks for students to use when explaining their observations during station work, such as 'I know this is a physical change because...'.
• Deeper: Invite students to research how engineers or chefs apply knowledge of physical and chemical properties in their work, then present one real-world application to the class.

Key Vocabulary

Physical Property	A characteristic of a substance that can be observed or measured without changing the substance's chemical identity. Examples include color, density, and melting point.
Chemical Property	A characteristic of a substance that describes its ability to undergo a chemical change or reaction. Examples include flammability and reactivity with acids.
Physical Change	A change in the form or appearance of a substance, but not its chemical composition. The original substance can often be recovered, such as ice melting into water.
Chemical Change	A change that results in the formation of one or more new substances with different properties. Evidence includes heat, light, gas, or color change, such as burning wood.
New Substance	A material formed during a chemical change that has different properties than the original substance(s).