Question

what are the characteristics of a chemical change

Answer 1

A chemical change should satisfy the following condition:
1-there should be a change in the chemical composition
2-the process should be irreversible
3-a chemical reaction must take place
4-there should be a change is colour,smell,temperature,or evolution of gas.

Example-formation of curd there is a new subtace formed from milk,it is irreversible. i.e it cannot be converted back to milk,a chemical reaction has taken place,change in smell occur.

Answer 2

Answer:

When there is a change in the chemical composition of the body then this change is known as chemical change.

The new substance so formed has different chemical properties from the initial state of the body.