What are reversible and irreversible changes? Explain with examples.

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Solution

Reversible changes
A substance can return to its original state.
The chemical properties of the substance do not change.
Most physical changes are reversible changes.
Ex. The freezing of ice and the melting of wax are examples of reversible change.
Irreversible changes
A substance cannot return to its original state.
The chemical properties of the substance change.
All chemical changes are irreversible changes.
Ex. The burning of wood and rusting of iron are examples of irreversible change.

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Question 1:

Four students have their own opinion about reversible and irreversible changes. Who among the following is correct?

Rohan: Both physical and chemical changes are reversible.

Sam: Both physical and chemical changes are irreversible.

Tom: Physical changes are irreversible and chemical changes are reversible.

Riah: Chemical changes are irreversible and physical changes are reversible

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