Question

A. Fill in the blank spaces by choosing the correct words from the words given in list.
List: composition, heat, chemical, photosynthesis, physical

2. Burning of coal is a …………….. change.

Answer 1

The burning of coal is a chemical change.

• Chemical change: A change that alters some specific properties of matter, by bringing about a change in its molecular composition.
• When coal is burned, it undergoes a chemical transition, resulting in the formation of new substances such as carbon dioxide and water. Burning coal is categorized as a chemical change since it is irreversible in nature and results in the development of a new material that cannot be converted back to coal.