Question

Which one of the following processes involves chemical change?

• A. Melting of ice
• B. Boiling of water
• C. Respiration
• D. Dissolving salt in water

Hint:

Chemical changes result in new substances being formed and are usually irreversible.

Answer 1

The Correct Option is C

1. Chemical change definition:
A chemical change involves the transformation of substances into new substances with different properties. 2. Respiration:
Respiration is a biochemical process where glucose and oxygen are converted into energy, carbon dioxide, and water. This is a chemical change because new substances are formed. 3. Other processes:
Melting of ice and boiling of water are physical changes, as no new substances are formed.
Dissolving salt in water is also a physical change, as the salt dissociates but remains chemically the same.