Question

classify the following is chemical or physical changes first cooking of food second boiling of water 3rd cutting of trees and fourth dissolving salt in water

Answer 1

Cooking of food is a physical change. It involves physical resources.

When boiling water, a material change happen.

The physical state changes.

Cutting of trees is also a physical change.

And when dissolving the salt in water, a chemical change happen.

It lets some of the chemical reactions to take place.

Answer 2

First,

Cooking of food is a chemical change, as cooked food can't be changed into its raw materials.

Second,

Boiling if water is a physical change, as here only vapour occurs, as only physical state of substnace changes here.


Third,

Cutting of tress is also a physical change as, no new substance discovered.

Fourth,

Dissolved salt in water is also a physical change as you can obtain salt fron its solution by simple physical methods.