Question

why the study checking chemical and physical properties of daily used substances is essential

Answer 1

A knowledge of properties of matter is important not only to scientists but engineers as well (and anybody who is working with matter). ... Any laboratory experimentation with the matter requires a knowledge of chemical reactivity and physical properties.

Answer 2

it i necessary to know the properties of elements/substances before using as it is said that prevention is better than cause , so we must be careful and also their knowledge is important. substances like sodium should not be let open in the environment. Therefore ,the study checking chemical and physical properties of daily used substances is essential.