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Lesson 17: Physical Changes What is a physical change? Reversible vs irreversible Examples from daily life
Year 8 • Chemistry
Physical Changes
In this lesson, students learn what physical changes are, understand the difference between reversible and irreversible changes, and identify physical changes using everyday examples.
Lesson Objectives
- Define a physical change.
- Distinguish between reversible and irreversible changes.
- Identify physical changes in daily life.
- Explain why no new substance is formed.
1. What Is a Physical Change?
A physical change is a change where the substance stays the same, but its form, shape, or state changes.
No new substance is formed.
[ Image Placeholder – Physical Change Examples ]
Examples:
• Ice melting into water
• Sugar dissolving in water
• Cutting paper
• Ice melting into water
• Sugar dissolving in water
• Cutting paper
2. Reversible Physical Changes
A reversible change is a change that can be undone and returned to the original state.
[ Image Placeholder – Reversible Changes ]
Examples:
• Melting and freezing water
• Dissolving salt and evaporating water
• Stretching a rubber band
• Melting and freezing water
• Dissolving salt and evaporating water
• Stretching a rubber band
3. Irreversible Physical Changes
An irreversible change cannot be undone easily.
The original object cannot be returned to its original form.
[ Image Placeholder – Irreversible Physical Changes ]
Examples:
• Breaking glass
• Tearing paper
• Crushing a can
• Breaking glass
• Tearing paper
• Crushing a can
4. Physical Changes in Daily Life
Physical changes happen around us every day.
[ Image Placeholder – Daily Life Physical Changes ]
• Ice cubes melting in drinks
• Clothes drying in the sun
• Cutting vegetables
• Sharpening a pencil
• Clothes drying in the sun
• Cutting vegetables
• Sharpening a pencil
Practice Questions
A. Fill in the Blanks
- A physical change does not form a __________ substance.
- Melting ice is a __________ change.
- Breaking glass is an __________ change.
- Dissolving sugar in water is __________.
- Stretching rubber can be __________.
B. True or False
- Physical changes create new substances.
- Freezing is reversible.
- Tearing paper is reversible.
- Physical changes change the state or shape.
- All physical changes are reversible.
C. Short Answer
- What is a physical change?
- Give one reversible physical change.
- Give one irreversible physical change.
- Why is dissolving sugar a physical change?
- Give two examples of physical changes from daily life.
✅ Show Answer Key
A. Fill in the Blanks
- new
- physical
- irreversible
- reversible
- reversible
B. True or False
- False
- True
- False
- True
- False
C. Short Answer
- A change where no new substance is formed.
- Melting ice.
- Breaking glass.
- No new substance is formed.
- Melting ice, cutting paper (any two).
© Aviate Learning – Physical Changes (Year 8)
🔁 Reversible or Irreversible?
Click on each change and decide whether it is reversible or irreversible.
Ask yourself: Can it be undone?
Select a change, then choose Reversible or Irreversible.