Answer: Lighting a match is a chemical change.
Explanation:
Physical change is defined as the change in which change in shape and size takes place. The chemical composition of a substance remains the same. No new substance is formed during this.
Chemical change is defined as the change in which change in chemical composition takes place. A new substance is formed in this.
For the given options:
Option a: Melting of ice
In this process, solid state (ice) is getting changed to liquid state (water). This is a physical change
Option b: Freezing water
In this process, liquid state (water) is getting changed to solid state (ice). This is a physical change
Option c: Crushing rock
In this process, rock is beaten up into small pieces. The size of the rock is changing. This is a physical change
Option d: Lighting a match
In this process, carbon (wood) is getting converted to carbon dioxide gas in the presence of oxygen. New substance (carbon dioxide) is getting formed.
[tex]C+O_2\rightarrow CO_2[/tex]
Hence, lighting a match is a chemical change.
