Give two differences between reversible and irreversible changes.

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Solution

Differences between reversible and irreversible changes:
Reversible Change Irreversible Change
1. All physical changes are reversible changes in which there is no change in the chemical property of the substance. 1. All Chemical changes are irreversible changes in which the chemical property of a substance changes completely.
2. Change is temporary and the original form of a substance can be achieved again. 2. Change is permanent and the original form of the substance cannot be obtained.
3. Example: Turning water into ice. 3. Example: Formation of rust when Iron reacts with moisture.

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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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Reversible Change	Irreversible Change
1. All physical changes are reversible changes in which there is no change in the chemical property of the substance.	1. All Chemical changes are irreversible changes in which the chemical property of a substance changes completely.
2. Change is temporary and the original form of a substance can be achieved again.	2. Change is permanent and the original form of the substance cannot be obtained.
3. Example: Turning water into ice.	3. Example: Formation of rust when Iron reacts with moisture.