Changes Around Us-Physical And Chemical Change, Characteristics
Characteristics of physical change :
1) No new substances are formed during physical change.
2) Physical change is temporary and can be easily reversible
3) There is no change in weight during physical change.
4) Only a little heat is absorbed (or) given off during a physical change.
5)There is usually no loss or gain of energy during a physical change
Every day examples of physical changes
Some of the very common examples of physical changes
1) Melting of ice (or) wax (or) butter (or) ghee.
2) Freezing of water to ice (or) solidification of liquid wax to solid wax.
3)sublimation of iodine or camphor
4) magnetisation of iron
5) breaking of a glass
6) Crystallisation of salts or sugar from their solutions
7) Changes of colour due to heat as in case of Zinc oxide (Zno)
(or) lead monoxide.
8) Formation of alloys ( Mixing metals )