Question

what is difference between chemical and physical change

Answer 1

chemical change is a change where there is a formation of new product
ex -burning of thread results in the formation of Ashes

physical change is a change where there is no formation of new product

ex -growing of tree

Answer 2

a physical change in a substance does not change what the substance is.
in a chemical change where there is a chemical reaction a new substance is formed and energy is either given off