Activity 2-unit 2-update 2024. English translation
Changes
1.
2. Physical changes.
Chemical changes.
Physical changes
Temporary changes in which no new
substances are formed are called physical
changes.
Eg:- evaporation of water, melting of ice.
3. Chemical changes
Permanent changes in which new substances
are produced are called chemical changes.
Eg:- burning of paper, rusting of iron.
4. The reactions in which heat energy is absorbed
or released is known as thermo chemical
reactions.