Question

Which among the following are physical or chemical changes?

(a) Evaporation of petrol

Answer 1

Physical change

• The changes which can be observed and specified like changes in color, hardness, rigidity, fluidity, density, melting point, boiling point, etc. are the physical changes.

Chemical change

• A chemical change is a change that results in the formation of new chemical substances.
• It involves the making or breaking of bonds between atoms.

Evaporation of petrol

• Only physical state is changing in evaporation of petrol.
• So, the Evaporation of petrol is a physical change.