Question

Which among the following are physical or chemical changes?

(d) Curdling of milk

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.

Curdling of milk

• Curdling milk results in the formation of curd, which has different chemical properties than milk.
• It is an irreversible change.
• Hence, it is a chemical change.