Classify each of the following changes as Physical or Chemical:

(a) Coal burning

(b) ice melting

(c) mixing chocolate syrup with milk

(d) explosion of a firecraker

(e) magnetizing of a screwdriver

Physical changes are the changes that does not lead to any change in chemical composition of a substance.

For example, mass, density, volume are all physical changes.

On the other hand, a change that leads to formation of a new compound by changing the chemical composition of reactants or combining atoms is known as a chemical change.

For example, combustion, toxicity, reactivity etc are all chemical changes.

Therefore, given changes are identified as follows.

Coal burning : It is a combustion reaction. Hence, it is a chemical change. Ice melting : Physical state of water changes from solid to liquid. Hence, it is a physical change. mixing chocolate syrup with milk : No new compound is forming as there is no chemical reaction occurring. Hence, it is also a physical change. explosion of a firecracker : It shows reactivity of fire cracker. Hence, it is a chemical reaction. magnetizing of a screwdriver : It shows physical attraction between the magnet and screwdriver. Hence, it is a physical change.