Definition of physical change : 1 Mark
Definition of chemical change : 1 Mark
Examples : 1 Mark
Physical changes are the changes that change the physical traits of the substance without making any change in their internal structure.
Example : Melting of ice cubes.
On the other hand, a chemical change is one that affects the internal structure of the substance so as to form a new substance.
Examlpes : Burning of wood.

Process : 1 Mark
Identification of the change : 1 Mark
When sugar is continuously heated, a black powdery substance is formed which is called charcoal.
Since a new product is formed, it is considered to be a chemical change.

Preparation of curd: 1 Mark
Statement: 1 Mark
Kind of change: 1 Mark
Milk is taken in a vessel and a small quantity of curd is added into it. It is stirred and kept aside for few hours without any disturbance. Finally, the milk is converted into curd.
However, curd formed cannot be converted into milk again.
This indicates that it is an irreversible change.

Classifications: 1 Mark each

$\begin{array}{ccc}\text{S.No}& \text{Changes}& \text{Type of Change}\\ 1& \text{Growth of a plant}& \text{Slow}\\ 2& \text{Formation of a cloud}& \text{Slow}\\ 3& \text{Formation of sugar solution}& \text{Fast}\\ 4& \text{Inflation of Tyre}& \text{Fast}\\ 5& \text{Melting of chocolate}& \text{Fast}\end{array}$

Classifications: 1 Mark each

$\begin{array}{ccc}\text{S.No}& \text{Changes}& \text{Type of change}\\ 1& \text{Dissolving salt in water}& \text{Reversible}\\ 2& \text{Melting ice cubes}& \text{Reversible}\\ 3& \text{Release of steam from pressure cooker}& \text{Irreversible}\\ 4& \text{Ripening of fruits}& \text{Irreversible}\\ 5& \text{Freezing orange juice by cooling}& \text{Reversible}\end{array}$

Classifications: 1 Mark each

$\begin{array}{ccc}\text{S.No}& \text{Changes}& \text{Type of Change}\\ 1& \text{Melting of Ice}& \text{Physical}\\ 2& \text{Dissolving sugar in water}& \text{Physical}\\ 3& \text{Burning rubber}& \text{Chemical}\\ 4& \text{Burning camphor}& \text{Chemical}\\ 5& \text{Melting of wax}& \text{Physical}\end{array}$