Changes in Matter

Curriculum Area and Level

Subject: Science
Grade Level: Year 6 (Equivalent to U.S. Grade 6)
Standards: Next Generation Science Standards (NGSS)

• PS1.A: Structure and Properties of Matter
• PS1.B: Chemical Reactions

Learning Objectives

By the end of this lesson, students will:

1. Differentiate between physical and chemical changes.
2. Observe and describe real-world examples of each type of change.
3. Apply critical thinking to determine whether a reaction is physical or chemical.

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Lesson Duration: 40 Minutes

Materials Needed

• Ice cubes
• Balloons
• Vinegar and baking soda
• Steel wool
• Lemon juice
• Sugar and water
• Worksheets with guided questions
• Whiteboard and markers

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Lesson Breakdown

Introduction (5 Minutes) - Setting the Stage

1. Engage: Ask students:
   • "What happens when you tear a piece of paper?"
   • "What happens when you burn a piece of paper?"
   • "Do these changes look different?"
2. Explain that some changes can be reversed (physical), while others cannot (chemical).
3. Introduce the two key terms: Physical Change and Chemical Change.

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Activity One (10 Minutes) - Hands-on Exploration

1. Station 1 – Ice Melting (Physical Change)

   • Students observe ice cubes melting in their hands and describe the change.
   • Ask: "Has the chemical structure of the water changed?"

2. Station 2 – Vinegar & Baking Soda (Chemical Change)

   • Students mix vinegar with baking soda and observe the reaction.
   • Ask: "What do you see? Gas bubbles? Is this a new substance?"

3. Station 3 – Lemon Juice on Steel Wool (Chemical Change)

   • Students place steel wool in lemon juice and observe over time (oxidation).
   • Question: "Do you notice rust forming? Is this a permanent change?"

4. Station 4 – Dissolving Sugar in Water (Physical Change)

   • Students stir sugar into water and observe it dissolving.
   • Ask: "If we evaporate the water, will sugar still be there?"

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Discussion (10 Minutes) - Making Sense of It

1. Gather students and discuss what they observed.
2. Guide students in categorizing each example as a physical or chemical change.
3. Highlight key differences:
   • Physical Change: Shape or state changes, but the substance stays the same.
   • Chemical Change: A new substance is created, usually seen through bubbling, color change, or heat emission.

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Apply and Extend (10 Minutes) – "Change Challenge" Game

1. Think-Pair-Share – Students pair up and are given new scenarios:
   • Burning a candle
   • Breaking glass
   • Toasting bread
   • Boiling water
2. Groups discuss and defend their answers: Physical or Chemical?
3. Share answers as a class and justify reasoning.

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Wrap-Up & Exit Ticket (5 Minutes)

• Students complete a quick exit ticket:
  “Describe one example of a physical change and one example of a chemical change from today's lesson.”
• Briefly discuss any lingering questions.

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Assessment & Reflection

• Formative Assessment: Direct observations during stations and group discussions.
• Summative Assessment: Exit ticket responses.
• Reflection: Ask students to think of changes they see at home (e.g., cooking eggs, freezing juice) and decide if they are physical or chemical changes.

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Differentiation & Support

• For advanced learners: Challenge them to find real-world examples outside of class.
• For struggling learners: Provide a visual reference sheet showing characteristics of chemical vs. physical changes.

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Teacher Reflection After Lesson

• What worked well? Any surprises?
• Were students able to accurately classify changes?
• How can the activity be improved for future lessons?

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Bonus Thought for Next Time!

Next lesson, explore how to reverse some physical changes and whether some chemical changes can be undone!