Question

4. State three ways by which a change can be brought about. 5. Differentiate between a reversible and an irreversible change.6. How the expansion of metals, which is a reversible change, put to good use? Support your answer by an example.

Answer 1

The three ways in which a change can be brought are:

1. Physical

2. Chemical

3. Temporary

Physical change is the change in which an object is changed without any change in its chemical composition.

Chemical change is the change in which chemical composition of the object is changed.