What criteria are used to distinguish between a chemical and physical change?

Answer 1

One distinguishing feature between physical and chemical changes is that a physical change can be reverse or turn back to its original form, but chemical change cannot be return to its form because the material change.

Answer 2

Chemical changes usually include one or more of the following: color change, temperature change, formation of a gas, or formation of a precipitation.

Physical changes include changes in physical state, changes in size, and the separation of the components of a mixture, or the formation of a mixture. They can be observed without changing the chemical composition of the matter.