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Physical Change and Chemical Change

Learning outcomes :

1) To Define and distinguish between physical changes and chemical changes with appropriate examples.

2)To Identify whether a given change is physical or chemical based on observable characteristics.

3)To Explain the key features of physical changes (e.g., no new substance formed, usually reversible).

4)To Explain the key features of chemical changes (e.g., formation of a new substance, often irreversible, energy changes).

Notes: 

                       Physical Change

During a Physical change, only a change in the arrangement of molecules occurs.Most of the physical changes are reversible.

Eg: Boiling of water, Tearing of paper, Stretching of rubber band etc.

                   Chemical Change 

During a Chemical change, new molecules are formed.Chemical change is irreversible.Chemical change is a permanent change.

Eg: Burning of paper, Rusting of iron, Burning of matchstick etc.

Video :

                     Assessment Questions 

1. What is a Physical change?

2. What is a Chemical change?

3. Give 2 examples for Chemical change.

4. Give 2 examples for Physical change.

5. Cutting of wood is a Chemical change. True/False

6. Burning of wood is a Chemical change. True/False