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Reversible vs Irreversible Changes
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Reversible vs Irreversible Changes
🔬 Part 1: Identifying Changes
1. Which of the following is a reversible change?
Melting ice
Cooking an egg
Burning wood
Rusting iron
2. Which of the following is an irreversible change?
Dissolving salt in water
Freezing water
Toasting bread
Evaporating water
3. Select all examples of reversible changes:
Melting chocolate
Baking a cake
Dissolving sugar in tea
Mixing sand and water
Burning paper
4. What happens during an irreversible change?
The substance can easily return to its original form
New substances are formed that cannot be changed back
Only the temperature changes
The substance just changes colour temporarily
✏️ Part 2: Explaining Changes
5. Explain why melting ice is a reversible change.
6. Give two examples of irreversible changes you might observe in a kitchen and explain why they cannot be reversed.
7. Complete the sentences using the words: physical, chemical, original, new
Reversible changes are usually _____________ changes where the substance can return to its _____________ form.
Irreversible changes are usually _____________ changes where _____________ substances are formed.
8. A student dissolves sugar in water. Is this reversible or irreversible? Explain your reasoning.
🎯 Part 3: Real-World Applications
9. Draw a line to match each change to the correct category:
Rusting of a bicycle
Evaporating puddles
Cooking sausages
Freezing orange juice
Reversible
Irreversible
Reversible
Irreversible
10. Think about traditional Aboriginal cooking methods. Explain whether cooking food over a fire is reversible or irreversible and why this knowledge was important for survival.
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