Reversible and Irreversible Changes

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🔬 Part 1: Understanding Changes

1. What is a reversible change?

A change that can be undone and the original material recovered

A change that creates a completely new substance

A change that only happens when heated

A change that takes a long time to happen

2. Which of these are examples of reversible changes? (Tick all that apply)

Ice melting into water

Sugar dissolving in water

Cooking an egg

Water freezing into ice

Rusting of a nail

3. What happens during an irreversible change?

The material stays exactly the same

New substances are produced that cannot be easily changed back

The change only lasts for a few minutes

Heat is never involved

4. Fill in the blanks:

When sugar dissolves in water, it is a _____________ change because the sugar can be recovered by _____________.

🧪 Part 2: Classifying Changes

5. Look at each example below. Write 'R' for reversible or 'I' for irreversible in the boxes:

a) Baking a cake ____

b) Melting chocolate ____

c) Burning wood ____

d) Salt dissolving in water ____

e) Cooking pancake batter ____

f) Water turning to steam ____

6. Explain why cooking is considered an irreversible change:

7. How does heat energy affect changes in materials? Give one example of each:

Reversible change with heat: _________________________________

Irreversible change with heat: _________________________________

🎨 Part 3: Design Challenge

8. Design a simple poster showing the difference between reversible and irreversible changes. Draw your design in the box below and include:

• At least 2 examples of each type of change

• Clear headings

• Simple drawings or diagrams

9. Reflection: What is one new thing you learned about changes in materials today?

Reversible and Irreversible Changes

Reversible and Irreversible Changes

🔬 Part 1: Understanding Changes

🧪 Part 2: Classifying Changes

🎨 Part 3: Design Challenge

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