Question

Is boiling point considered a physical or chemical change?

Answer 1

Hint: A chemical compound can turn into other chemical compounds by undergoing a change. These changes are of two types. They are physical change and chemical change. Physical changes are reversible and also a temporary change. Boiling point means a temperature at which the liquid turns into a vapor phase.

Complete answer:
The substance or object which can occupy space and has mass can be considered as matter. Matter was classified into three types. They are solid, liquid, and vapor. One substance from one phase to another phase can be converted.
When a substance undergoes a change from solid to liquid then the process is known as melting. When a substance undergoes a change from liquid to vapor then the process is known as boiling. Boiling point is a point or temperature at which the liquid starts converting into vapor state.
The changes that occur in a chemical substance are of two types. They are physical change, and chemical change.
A boiling point means the conversion of a substance which is in liquid state to vapor state, which is a temporary process and can be reversible when the temperature decreases. As there is a change in only appearance, it is a physical change.
Thus, boiling point is considered as a physical change.

Note:
In a physical change, there is a change in the appearance only but not chemical composition. It is a temporary process and reversible process. In a chemical change, there is a change in the chemical composition and appearance also. It is not a reversible process and also a permanent process. Differences must be known between physical and chemical changes.