Question

Write P for the physical change and C for the chemical change in the following changes given below-

1. Formation of dew
2. Evaporation of water
3. The crystallisation of sugar from its saturated solution
4. Smoking of cigarette
5. Drying of paints
6. The ringing of an electric bell
7. Rusting of iron
8. Burning of petrol
9. Ripening of fruits
10. Butter turning rancid
11. Breaking of a glass pane
12. Clotting of blood
13. Fading of a colour of a dyed cloth
14. Burning of cooking gas
15. Making ice cream
16. Baking of cake
17. Magnetisation of iron
18. Glowing of a tube light

Answer 1

Physical change - A change that alters some specific properties of matter like state, colour, texture, magnetic or electric conditions, etc without any change in the composition of the molecules is called a physical change.

Chemical change - A change that alters specific properties of a material by changing its molecular composition, followed by a change in state is called a chemical change.

The given changes are categorised as follows-

1. Formation of dew - Physical change
2. Evaporation of water- Physical change
3. The crystallisation of sugar from its saturated solution - Physical change
4. Smoking of cigarettes - Chemical change
5. Drying of paints - Both chemical and physical change
6. The ringing of an electric bell - Physical change
7. Rusting of iron - Chemical change
8. Burning of petrol - Chemical change
9. Ripening of fruits - Chemical change
10. Butter turning rancid - Chemical change
11. Breaking of a glass pane - Physical change
12. Clotting of blood - Chemical change
13. Fading of a colour of a dyed cloth - Chemical change
14. Burning of cooking gas - Chemical change
15. Making ice cream - Physical change
16. Baking of cake - Chemical change
17. The magnetisation of iron - Physical change
18. Glowing of a tube light - Physical change