How do we differentiate chemical change from physical change

In a physical change the nature of the substance, the particles of which it is composed and the numbers of particles remain unchanged. In a chemical change the properties of the new substances are different from the original, the particles are different and the number of particles can change.

Chemical change :has change in mass, heat is needed, new element is formed, hard to reverse

Physicalchange:does not have change in mass, heat is not necessary, no new element is formed, easy to reverse

120,630,890

step-by-step explanation:

110+10=120,620+10=630,880+10=890