Question

study physical and chemical properties of daily used substances is necessary explain

Answer 1

A chemical change results from a chemical reaction, while a physical change is when matter changes forms but not chemical identity.Examples of chemical changes are burning, cooking, rusting, and rotting.Examples of physical changes are boiling, melting, freezing, and shredding.Often, physical changes can be undone, if energy is input. The only way to reverse a chemical change is via another chemical reaction.

example
Burning wood
Souring milk
Mixing acid and base
Digesting food
Cooking an egg
Heating sugar to form caramel
Baking a cake
Rusting of iron