Hint: When the change is observed in the physical appearance of the substance and no chemical change is observed the phenomenon is known as physical change. Physical changes are reversible in nature and can be seen by eyes.
Complete step by step answer:
Initially butter is in solid state.
The process of forming a liquid from a solid substance when heat is supplied is known as melting.
When we supply heat to butter or place the butter on a hot pan, the solid butter changes to liquid butter. This is known as the melting of butter.
When butter melts, it becomes liquid in physical appearance and it can be seen by our eyes.
On cooling the liquid butter, it again changes to the solid state. Thus, melting of butter is a reversible process.
No change in the chemical composition occurs when it is melted.
Thus, melting of butter is a physical process because the physical appearance of the butter changes, the change is visible to eyes, the change can be reversed and no chemical change occurs.
Thus, the statement ‘melting of butter is a physical change’ is true.
Note:
Chemical changes are not reversible in nature. During a chemical change, the chemical composition of substance changes. Examples of chemical change are digestion of food, boiling of an egg, rusting of metal, burning of coal, etc. Other examples of physical change are mixing water and sand, melting of ice, boiling of water, dissolving sugar in water, etc.
