Question

Classify the following changes as reversible or irreversible :
1. Melting of ghee
2. Bursting of crackers
3. Mixing oil and water
4. Caramelizing sugar
5. Tearing of paper​

Answer 1

Answer:

1.reversible change

2. irreversible change

3. reversible change

4.irreversible change

5.irreversible change

Answer 2

If a change can be reversed by reversing its conditions is called a Reversible change.

Changes that cannot be reversed by reversing their conditions are called Irreversible changes.

1) Melting of ghee

• It is a reversible change
• Heating melts the ghee. Cooling the melted ghee returns the ghee to its normal form.

2) Bursting of crackers

• It is an irreversible change
• Burst crackers cannot be obtained in the same form after bursting.

3) Mixing oil and water

• It is an irreversible change
• Mixing any substances cause irreversible change because they cannot be obtained back without physical means.

4) Caramelizing sugar

• It is an Irreversible change
• Heating sugar melts it is called caramelizing. Cooling down the sugar will not return it to its original state which is granules of sugar.

5) Tearing of paper

• It is an irreversible change.
• Torn paper cannot be joined back to its original form.

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