Question

How do we come to know that a chemical reaction has taken place?

NCERT Class 10th Science Chapter 1 Chemical Reactions and Equations

Answer 1

There will be a change in the element's mass number(protons and neutrons).A change in the color of the compound and also the color inside the flask.A change in the number of electrons as well as the energy required to change it's state.Often the presence of bubbles can also be used to identify that a reaction has taken place.Please mark as brainliest answer!