Question

What are chemical reaction and write characteristics of chemical reaction?

Answer 1

A chemical reaction results in a change of molecular or ionic structure. Scientists and medical professionals create and observe chemical reactions in order to study these changes. But how do they know whether a chemical reaction has taken place during the course of an experiment? The only way to know for sure is to perform a detailed chemical analysis. However, chemical reactions have several observable characteristics that scientists can see. The presence of one or more of these characteristics may indicate that a chemical reaction has taken place.

Answer 2

A chemical reaction is a process in which new substances are formed with completely new properties. The substance which reacts in a chemical reaction are called reactant and the new substance produced as a result of chemical reaction are called products.
Evolution of gas:
Change in temperaturechange in clour   etc