When a substance undergoes a change in its physical properties, it is called:
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → Physical change
When a substance undergoes a change in its physical properties (like state, shape, size, color, density, etc.) but its chemical composition remains the same, it is called a Physical change. No new substance is formed in a physical change.
- Chemical change: Involves a change in the chemical composition of a substance, resulting in the formation of one or more new substances. Examples include burning wood or rusting iron.
- Sublimation change: This is a type of physical change, specifically the phase transition from solid directly to gas. It's not a general term for all physical property changes.
- Biological change: Refers to changes that occur in living organisms, often involving complex biochemical reactions or growth processes.