Question

Which of the following are physical changes?

a) Rusting of an iron sheet

b) Cutting of an iron rod

c) Melting of ghee

d) Breaking water into hydrogen and oxygen

e) Diluting an acid solution

Answer 1

Changes of matter can be classified as chemical and physical changes

Physical changes

• Changes which involve only physical properties like colour, appearence etc.
• It doesn't involve any change in chemical nature of substances.
• No new substance is forming.
• It is reversible in nature.

Chemical changes

• Changes which involve only chemical properties like bonding.
• It can result in change in heat,energy etc.
• It is an irreversible change.

Among these, physical changes are: Cutting of an iron rod, Melting of ghee since it doesn't involve any other product formation.